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How to use ImmutableCollections method of org.assertj.core.test.jdk11.ImmutableCollections class

Best Assertj code snippet using org.assertj.core.test.jdk11.ImmutableCollections.ImmutableCollections

Source:Jdk11.java

...26     *27     * @since 928     */29    static <E> java.util.Set<E> of() {30      return ImmutableCollections.emptySet();31    }32    /**33     * Returns an unmodifiable set containing one element.34     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.35     *36     * @param <E> the {@code Set}'s element type37     * @param e1 the single element38     * @return a {@code Set} containing the specified element39     * @throws NullPointerException if the element is {@code null}40     *41     * @since 942     */43    static <E> java.util.Set<E> of(E e1) {44      return new ImmutableCollections.Set12<>(e1);45    }46    /**47     * Returns an unmodifiable set containing two elements.48     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.49     *50     * @param <E> the {@code Set}'s element type51     * @param e1 the first element52     * @param e2 the second element53     * @return a {@code Set} containing the specified elements54     * @throws IllegalArgumentException if the elements are duplicates55     * @throws NullPointerException if an element is {@code null}56     *57     * @since 958     */59    static <E> java.util.Set<E> of(E e1, E e2) {60      return new ImmutableCollections.Set12<>(e1, e2);61    }62    /**63     * Returns an unmodifiable set containing three elements.64     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.65     *66     * @param <E> the {@code Set}'s element type67     * @param e1 the first element68     * @param e2 the second element69     * @param e3 the third element70     * @return a {@code Set} containing the specified elements71     * @throws IllegalArgumentException if there are any duplicate elements72     * @throws NullPointerException if an element is {@code null}73     *74     * @since 975     */76    static <E> java.util.Set<E> of(E e1, E e2, E e3) {77      return new ImmutableCollections.SetN<>(e1, e2, e3);78    }79    /**80     * Returns an unmodifiable set containing four elements.81     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.82     *83     * @param <E> the {@code Set}'s element type84     * @param e1 the first element85     * @param e2 the second element86     * @param e3 the third element87     * @param e4 the fourth element88     * @return a {@code Set} containing the specified elements89     * @throws IllegalArgumentException if there are any duplicate elements90     * @throws NullPointerException if an element is {@code null}91     *92     * @since 993     */94    static <E> java.util.Set<E> of(E e1, E e2, E e3, E e4) {95      return new ImmutableCollections.SetN<>(e1, e2, e3, e4);96    }97    /**98     * Returns an unmodifiable set containing five elements.99     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.100     *101     * @param <E> the {@code Set}'s element type102     * @param e1 the first element103     * @param e2 the second element104     * @param e3 the third element105     * @param e4 the fourth element106     * @param e5 the fifth element107     * @return a {@code Set} containing the specified elements108     * @throws IllegalArgumentException if there are any duplicate elements109     * @throws NullPointerException if an element is {@code null}110     *111     * @since 9112     */113    static <E> java.util.Set<E> of(E e1, E e2, E e3, E e4, E e5) {114      return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5);115    }116    /**117     * Returns an unmodifiable set containing six elements.118     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.119     *120     * @param <E> the {@code Set}'s element type121     * @param e1 the first element122     * @param e2 the second element123     * @param e3 the third element124     * @param e4 the fourth element125     * @param e5 the fifth element126     * @param e6 the sixth element127     * @return a {@code Set} containing the specified elements128     * @throws IllegalArgumentException if there are any duplicate elements129     * @throws NullPointerException if an element is {@code null}130     *131     * @since 9132     */133    static <E> java.util.Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6) {134      return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,135                                             e6);136    }137    /**138     * Returns an unmodifiable set containing seven elements.139     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.140     *141     * @param <E> the {@code Set}'s element type142     * @param e1 the first element143     * @param e2 the second element144     * @param e3 the third element145     * @param e4 the fourth element146     * @param e5 the fifth element147     * @param e6 the sixth element148     * @param e7 the seventh element149     * @return a {@code Set} containing the specified elements150     * @throws IllegalArgumentException if there are any duplicate elements151     * @throws NullPointerException if an element is {@code null}152     *153     * @since 9154     */155    static <E> java.util.Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7) {156      return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,157                                             e6, e7);158    }159    /**160     * Returns an unmodifiable set containing eight elements.161     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.162     *163     * @param <E> the {@code Set}'s element type164     * @param e1 the first element165     * @param e2 the second element166     * @param e3 the third element167     * @param e4 the fourth element168     * @param e5 the fifth element169     * @param e6 the sixth element170     * @param e7 the seventh element171     * @param e8 the eighth element172     * @return a {@code Set} containing the specified elements173     * @throws IllegalArgumentException if there are any duplicate elements174     * @throws NullPointerException if an element is {@code null}175     *176     * @since 9177     */178    static <E> java.util.Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8) {179      return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,180                                             e6, e7, e8);181    }182    /**183     * Returns an unmodifiable set containing nine elements.184     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.185     *186     * @param <E> the {@code Set}'s element type187     * @param e1 the first element188     * @param e2 the second element189     * @param e3 the third element190     * @param e4 the fourth element191     * @param e5 the fifth element192     * @param e6 the sixth element193     * @param e7 the seventh element194     * @param e8 the eighth element195     * @param e9 the ninth element196     * @return a {@code Set} containing the specified elements197     * @throws IllegalArgumentException if there are any duplicate elements198     * @throws NullPointerException if an element is {@code null}199     *200     * @since 9201     */202    static <E> java.util.Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9) {203      return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,204                                             e6, e7, e8, e9);205    }206    /**207     * Returns an unmodifiable set containing ten elements.208     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.209     *210     * @param <E> the {@code Set}'s element type211     * @param e1 the first element212     * @param e2 the second element213     * @param e3 the third element214     * @param e4 the fourth element215     * @param e5 the fifth element216     * @param e6 the sixth element217     * @param e7 the seventh element218     * @param e8 the eighth element219     * @param e9 the ninth element220     * @param e10 the tenth element221     * @return a {@code Set} containing the specified elements222     * @throws IllegalArgumentException if there are any duplicate elements223     * @throws NullPointerException if an element is {@code null}224     *225     * @since 9226     */227    static <E> java.util.Set<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10) {228      return new ImmutableCollections.SetN<>(e1, e2, e3, e4, e5,229                                             e6, e7, e8, e9, e10);230    }231    /**232     * Returns an unmodifiable set containing an arbitrary number of elements.233     * See <a href="#unmodifiable">Unmodifiable Sets</a> for details.234     *235     * @apiNote236     * This method also accepts a single array as an argument. The element type of237     * the resulting set will be the component type of the array, and the size of238     * the set will be equal to the length of the array. To create a set with239     * a single element that is an array, do the following:240     *241     * <pre>{@code242     *     String[] array = ... ;243     *     Set<String[]> list = Set.<String[]>of(array);244     * }</pre>245     *246     * This will cause the {@link java.util.Set#of(Object) Set.of(E)} method247     * to be invoked instead.248     *249     * @param <E> the {@code Set}'s element type250     * @param elements the elements to be contained in the set251     * @return a {@code Set} containing the specified elements252     * @throws IllegalArgumentException if there are any duplicate elements253     * @throws NullPointerException if an element is {@code null} or if the array is {@code null}254     *255     * @since 9256     */257    @SafeVarargs258    @SuppressWarnings("varargs")259    static <E> java.util.Set<E> of(E... elements) {260      switch (elements.length) { // implicit null check of elements261      case 0:262        return ImmutableCollections.emptySet();263      case 1:264        return new ImmutableCollections.Set12<>(elements[0]);265      case 2:266        return new ImmutableCollections.Set12<>(elements[0], elements[1]);267      default:268        return new ImmutableCollections.SetN<>(elements);269      }270    }271    /**272     * Returns an <a href="#unmodifiable">unmodifiable Set</a> containing the elements273     * of the given Collection. The given Collection must not be null, and it must not274     * contain any null elements. If the given Collection contains duplicate elements,275     * an arbitrary element of the duplicates is preserved. If the given Collection is276     * subsequently modified, the returned Set will not reflect such modifications.277     *278     * @implNote279     * If the given Collection is an <a href="#unmodifiable">unmodifiable Set</a>,280     * calling copyOf will generally not create a copy.281     *282     * @param <E> the {@code Set}'s element type283     * @param coll a {@code Collection} from which elements are drawn, must be non-null284     * @return a {@code Set} containing the elements of the given {@code Collection}285     * @throws NullPointerException if coll is null, or if it contains any nulls286     * @since 10287     */288    @SuppressWarnings("unchecked")289    static <E> java.util.Set<E> copyOf(Collection<? extends E> coll) {290      if (coll instanceof ImmutableCollections.AbstractImmutableSet) {291        return (java.util.Set<E>) coll;292      } else {293        return (java.util.Set<E>) Set.of(new HashSet<>(coll).toArray());294      }295    }296  }297  public interface List {298    /**299     * Returns an unmodifiable list containing zero elements.300     *301     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.302     *303     * @param <E> the {@code List}'s element type304     * @return an empty {@code List}305     *306     * @since 9307     */308    static <E> java.util.List<E> of() {309      return ImmutableCollections.emptyList();310    }311    /**312     * Returns an unmodifiable list containing one element.313     *314     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.315     *316     * @param <E> the {@code List}'s element type317     * @param e1 the single element318     * @return a {@code List} containing the specified element319     * @throws NullPointerException if the element is {@code null}320     *321     * @since 9322     */323    static <E> java.util.List<E> of(E e1) {324      return new ImmutableCollections.List12<>(e1);325    }326    /**327     * Returns an unmodifiable list containing two elements.328     *329     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.330     *331     * @param <E> the {@code List}'s element type332     * @param e1 the first element333     * @param e2 the second element334     * @return a {@code List} containing the specified elements335     * @throws NullPointerException if an element is {@code null}336     *337     * @since 9338     */339    static <E> java.util.List<E> of(E e1, E e2) {340      return new ImmutableCollections.List12<>(e1, e2);341    }342    /**343     * Returns an unmodifiable list containing three elements.344     *345     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.346     *347     * @param <E> the {@code List}'s element type348     * @param e1 the first element349     * @param e2 the second element350     * @param e3 the third element351     * @return a {@code List} containing the specified elements352     * @throws NullPointerException if an element is {@code null}353     *354     * @since 9355     */356    static <E> java.util.List<E> of(E e1, E e2, E e3) {357      return new ImmutableCollections.ListN<>(e1, e2, e3);358    }359    /**360     * Returns an unmodifiable list containing four elements.361     *362     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.363     *364     * @param <E> the {@code List}'s element type365     * @param e1 the first element366     * @param e2 the second element367     * @param e3 the third element368     * @param e4 the fourth element369     * @return a {@code List} containing the specified elements370     * @throws NullPointerException if an element is {@code null}371     *372     * @since 9373     */374    static <E> java.util.List<E> of(E e1, E e2, E e3, E e4) {375      return new ImmutableCollections.ListN<>(e1, e2, e3, e4);376    }377    /**378     * Returns an unmodifiable list containing five elements.379     *380     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.381     *382     * @param <E> the {@code List}'s element type383     * @param e1 the first element384     * @param e2 the second element385     * @param e3 the third element386     * @param e4 the fourth element387     * @param e5 the fifth element388     * @return a {@code List} containing the specified elements389     * @throws NullPointerException if an element is {@code null}390     *391     * @since 9392     */393    static <E> java.util.List<E> of(E e1, E e2, E e3, E e4, E e5) {394      return new ImmutableCollections.ListN<>(e1, e2, e3, e4, e5);395    }396    /**397     * Returns an unmodifiable list containing six elements.398     *399     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.400     *401     * @param <E> the {@code List}'s element type402     * @param e1 the first element403     * @param e2 the second element404     * @param e3 the third element405     * @param e4 the fourth element406     * @param e5 the fifth element407     * @param e6 the sixth element408     * @return a {@code List} containing the specified elements409     * @throws NullPointerException if an element is {@code null}410     *411     * @since 9412     */413    static <E> java.util.List<E> of(E e1, E e2, E e3, E e4, E e5, E e6) {414      return new ImmutableCollections.ListN<>(e1, e2, e3, e4, e5,415                                              e6);416    }417    /**418     * Returns an unmodifiable list containing seven elements.419     *420     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.421     *422     * @param <E> the {@code List}'s element type423     * @param e1 the first element424     * @param e2 the second element425     * @param e3 the third element426     * @param e4 the fourth element427     * @param e5 the fifth element428     * @param e6 the sixth element429     * @param e7 the seventh element430     * @return a {@code List} containing the specified elements431     * @throws NullPointerException if an element is {@code null}432     *433     * @since 9434     */435    static <E> java.util.List<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7) {436      return new ImmutableCollections.ListN<>(e1, e2, e3, e4, e5,437                                              e6, e7);438    }439    /**440     * Returns an unmodifiable list containing eight elements.441     *442     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.443     *444     * @param <E> the {@code List}'s element type445     * @param e1 the first element446     * @param e2 the second element447     * @param e3 the third element448     * @param e4 the fourth element449     * @param e5 the fifth element450     * @param e6 the sixth element451     * @param e7 the seventh element452     * @param e8 the eighth element453     * @return a {@code List} containing the specified elements454     * @throws NullPointerException if an element is {@code null}455     *456     * @since 9457     */458    static <E> java.util.List<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8) {459      return new ImmutableCollections.ListN<>(e1, e2, e3, e4, e5,460                                              e6, e7, e8);461    }462    /**463     * Returns an unmodifiable list containing nine elements.464     *465     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.466     *467     * @param <E> the {@code List}'s element type468     * @param e1 the first element469     * @param e2 the second element470     * @param e3 the third element471     * @param e4 the fourth element472     * @param e5 the fifth element473     * @param e6 the sixth element474     * @param e7 the seventh element475     * @param e8 the eighth element476     * @param e9 the ninth element477     * @return a {@code List} containing the specified elements478     * @throws NullPointerException if an element is {@code null}479     *480     * @since 9481     */482    static <E> java.util.List<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9) {483      return new ImmutableCollections.ListN<>(e1, e2, e3, e4, e5,484                                              e6, e7, e8, e9);485    }486    /**487     * Returns an unmodifiable list containing ten elements.488     *489     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.490     *491     * @param <E> the {@code List}'s element type492     * @param e1 the first element493     * @param e2 the second element494     * @param e3 the third element495     * @param e4 the fourth element496     * @param e5 the fifth element497     * @param e6 the sixth element498     * @param e7 the seventh element499     * @param e8 the eighth element500     * @param e9 the ninth element501     * @param e10 the tenth element502     * @return a {@code List} containing the specified elements503     * @throws NullPointerException if an element is {@code null}504     *505     * @since 9506     */507    static <E> java.util.List<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10) {508      return new ImmutableCollections.ListN<>(e1, e2, e3, e4, e5,509                                              e6, e7, e8, e9, e10);510    }511    /**512     * Returns an unmodifiable list containing an arbitrary number of elements.513     * See <a href="#unmodifiable">Unmodifiable Lists</a> for details.514     *515     * @apiNote516     * This method also accepts a single array as an argument. The element type of517     * the resulting list will be the component type of the array, and the size of518     * the list will be equal to the length of the array. To create a list with519     * a single element that is an array, do the following:520     *521     * <pre>{@code522     *     String[] array = ... ;523     *     List<String[]> list = List.<String[]>of(array);524     * }</pre>525     *526     * This will cause the {@link java.util.List#of(Object) List.of(E)} method527     * to be invoked instead.528     *529     * @param <E> the {@code List}'s element type530     * @param elements the elements to be contained in the list531     * @return a {@code List} containing the specified elements532     * @throws NullPointerException if an element is {@code null} or if the array is {@code null}533     *534     * @since 9535     */536    @SafeVarargs537    @SuppressWarnings("varargs")538    static <E> java.util.List<E> of(E... elements) {539      switch (elements.length) { // implicit null check of elements540      case 0:541        return ImmutableCollections.emptyList();542      case 1:543        return new ImmutableCollections.List12<>(elements[0]);544      case 2:545        return new ImmutableCollections.List12<>(elements[0], elements[1]);546      default:547        return new ImmutableCollections.ListN<>(elements);548      }549    }550    /**551     * Returns an <a href="#unmodifiable">unmodifiable List</a> containing the elements of552     * the given Collection, in its iteration order. The given Collection must not be null,553     * and it must not contain any null elements. If the given Collection is subsequently554     * modified, the returned List will not reflect such modifications.555     *556     * @implNote557     * If the given Collection is an <a href="#unmodifiable">unmodifiable List</a>,558     * calling copyOf will generally not create a copy.559     *560     * @param <E> the {@code List}'s element type561     * @param coll a {@code Collection} from which elements are drawn, must be non-null562     * @return a {@code List} containing the elements of the given {@code Collection}563     * @throws NullPointerException if coll is null, or if it contains any nulls564     * @since 10565     */566    static <E> java.util.List<E> copyOf(Collection<? extends E> coll) {567      return ImmutableCollections.listCopy(coll);568    }569  }570  public interface Map {571    /**572     * Returns an unmodifiable map containing zero mappings.573     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.574     *575     * @param <K> the {@code Map}'s key type576     * @param <V> the {@code Map}'s value type577     * @return an empty {@code Map}578     *579     * @since 9580     */581    static <K, V> java.util.Map<K, V> of() {582      return ImmutableCollections.emptyMap();583    }584    /**585     * Returns an unmodifiable map containing a single mapping.586     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.587     *588     * @param <K> the {@code Map}'s key type589     * @param <V> the {@code Map}'s value type590     * @param k1 the mapping's key591     * @param v1 the mapping's value592     * @return a {@code Map} containing the specified mapping593     * @throws NullPointerException if the key or the value is {@code null}594     *595     * @since 9596     */597    static <K, V> java.util.Map<K, V> of(K k1, V v1) {598      return new ImmutableCollections.Map1<>(k1, v1);599    }600    /**601     * Returns an unmodifiable map containing two mappings.602     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.603     *604     * @param <K> the {@code Map}'s key type605     * @param <V> the {@code Map}'s value type606     * @param k1 the first mapping's key607     * @param v1 the first mapping's value608     * @param k2 the second mapping's key609     * @param v2 the second mapping's value610     * @return a {@code Map} containing the specified mappings611     * @throws IllegalArgumentException if the keys are duplicates612     * @throws NullPointerException if any key or value is {@code null}613     *614     * @since 9615     */616    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2) {617      return new ImmutableCollections.MapN<>(k1, v1, k2, v2);618    }619    /**620     * Returns an unmodifiable map containing three mappings.621     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.622     *623     * @param <K> the {@code Map}'s key type624     * @param <V> the {@code Map}'s value type625     * @param k1 the first mapping's key626     * @param v1 the first mapping's value627     * @param k2 the second mapping's key628     * @param v2 the second mapping's value629     * @param k3 the third mapping's key630     * @param v3 the third mapping's value631     * @return a {@code Map} containing the specified mappings632     * @throws IllegalArgumentException if there are any duplicate keys633     * @throws NullPointerException if any key or value is {@code null}634     *635     * @since 9636     */637    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3) {638      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3);639    }640    /**641     * Returns an unmodifiable map containing four mappings.642     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.643     *644     * @param <K> the {@code Map}'s key type645     * @param <V> the {@code Map}'s value type646     * @param k1 the first mapping's key647     * @param v1 the first mapping's value648     * @param k2 the second mapping's key649     * @param v2 the second mapping's value650     * @param k3 the third mapping's key651     * @param v3 the third mapping's value652     * @param k4 the fourth mapping's key653     * @param v4 the fourth mapping's value654     * @return a {@code Map} containing the specified mappings655     * @throws IllegalArgumentException if there are any duplicate keys656     * @throws NullPointerException if any key or value is {@code null}657     *658     * @since 9659     */660    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) {661      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3, k4, v4);662    }663    /**664     * Returns an unmodifiable map containing five mappings.665     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.666     *667     * @param <K> the {@code Map}'s key type668     * @param <V> the {@code Map}'s value type669     * @param k1 the first mapping's key670     * @param v1 the first mapping's value671     * @param k2 the second mapping's key672     * @param v2 the second mapping's value673     * @param k3 the third mapping's key674     * @param v3 the third mapping's value675     * @param k4 the fourth mapping's key676     * @param v4 the fourth mapping's value677     * @param k5 the fifth mapping's key678     * @param v5 the fifth mapping's value679     * @return a {@code Map} containing the specified mappings680     * @throws IllegalArgumentException if there are any duplicate keys681     * @throws NullPointerException if any key or value is {@code null}682     *683     * @since 9684     */685    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) {686      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5);687    }688    /**689     * Returns an unmodifiable map containing six mappings.690     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.691     *692     * @param <K> the {@code Map}'s key type693     * @param <V> the {@code Map}'s value type694     * @param k1 the first mapping's key695     * @param v1 the first mapping's value696     * @param k2 the second mapping's key697     * @param v2 the second mapping's value698     * @param k3 the third mapping's key699     * @param v3 the third mapping's value700     * @param k4 the fourth mapping's key701     * @param v4 the fourth mapping's value702     * @param k5 the fifth mapping's key703     * @param v5 the fifth mapping's value704     * @param k6 the sixth mapping's key705     * @param v6 the sixth mapping's value706     * @return a {@code Map} containing the specified mappings707     * @throws IllegalArgumentException if there are any duplicate keys708     * @throws NullPointerException if any key or value is {@code null}709     *710     * @since 9711     */712    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,713                                         K k6, V v6) {714      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5,715                                             k6, v6);716    }717    /**718     * Returns an unmodifiable map containing seven mappings.719     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.720     *721     * @param <K> the {@code Map}'s key type722     * @param <V> the {@code Map}'s value type723     * @param k1 the first mapping's key724     * @param v1 the first mapping's value725     * @param k2 the second mapping's key726     * @param v2 the second mapping's value727     * @param k3 the third mapping's key728     * @param v3 the third mapping's value729     * @param k4 the fourth mapping's key730     * @param v4 the fourth mapping's value731     * @param k5 the fifth mapping's key732     * @param v5 the fifth mapping's value733     * @param k6 the sixth mapping's key734     * @param v6 the sixth mapping's value735     * @param k7 the seventh mapping's key736     * @param v7 the seventh mapping's value737     * @return a {@code Map} containing the specified mappings738     * @throws IllegalArgumentException if there are any duplicate keys739     * @throws NullPointerException if any key or value is {@code null}740     *741     * @since 9742     */743    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,744                                         K k6, V v6, K k7, V v7) {745      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5,746                                             k6, v6, k7, v7);747    }748    /**749     * Returns an unmodifiable map containing eight mappings.750     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.751     *752     * @param <K> the {@code Map}'s key type753     * @param <V> the {@code Map}'s value type754     * @param k1 the first mapping's key755     * @param v1 the first mapping's value756     * @param k2 the second mapping's key757     * @param v2 the second mapping's value758     * @param k3 the third mapping's key759     * @param v3 the third mapping's value760     * @param k4 the fourth mapping's key761     * @param v4 the fourth mapping's value762     * @param k5 the fifth mapping's key763     * @param v5 the fifth mapping's value764     * @param k6 the sixth mapping's key765     * @param v6 the sixth mapping's value766     * @param k7 the seventh mapping's key767     * @param v7 the seventh mapping's value768     * @param k8 the eighth mapping's key769     * @param v8 the eighth mapping's value770     * @return a {@code Map} containing the specified mappings771     * @throws IllegalArgumentException if there are any duplicate keys772     * @throws NullPointerException if any key or value is {@code null}773     *774     * @since 9775     */776    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,777                                         K k6, V v6, K k7, V v7, K k8, V v8) {778      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5,779                                             k6, v6, k7, v7, k8, v8);780    }781    /**782     * Returns an unmodifiable map containing nine mappings.783     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.784     *785     * @param <K> the {@code Map}'s key type786     * @param <V> the {@code Map}'s value type787     * @param k1 the first mapping's key788     * @param v1 the first mapping's value789     * @param k2 the second mapping's key790     * @param v2 the second mapping's value791     * @param k3 the third mapping's key792     * @param v3 the third mapping's value793     * @param k4 the fourth mapping's key794     * @param v4 the fourth mapping's value795     * @param k5 the fifth mapping's key796     * @param v5 the fifth mapping's value797     * @param k6 the sixth mapping's key798     * @param v6 the sixth mapping's value799     * @param k7 the seventh mapping's key800     * @param v7 the seventh mapping's value801     * @param k8 the eighth mapping's key802     * @param v8 the eighth mapping's value803     * @param k9 the ninth mapping's key804     * @param v9 the ninth mapping's value805     * @return a {@code Map} containing the specified mappings806     * @throws IllegalArgumentException if there are any duplicate keys807     * @throws NullPointerException if any key or value is {@code null}808     *809     * @since 9810     */811    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,812                                         K k6, V v6, K k7, V v7, K k8, V v8, K k9, V v9) {813      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5,814                                             k6, v6, k7, v7, k8, v8, k9, v9);815    }816    /**817     * Returns an unmodifiable map containing ten mappings.818     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.819     *820     * @param <K> the {@code Map}'s key type821     * @param <V> the {@code Map}'s value type822     * @param k1 the first mapping's key823     * @param v1 the first mapping's value824     * @param k2 the second mapping's key825     * @param v2 the second mapping's value826     * @param k3 the third mapping's key827     * @param v3 the third mapping's value828     * @param k4 the fourth mapping's key829     * @param v4 the fourth mapping's value830     * @param k5 the fifth mapping's key831     * @param v5 the fifth mapping's value832     * @param k6 the sixth mapping's key833     * @param v6 the sixth mapping's value834     * @param k7 the seventh mapping's key835     * @param v7 the seventh mapping's value836     * @param k8 the eighth mapping's key837     * @param v8 the eighth mapping's value838     * @param k9 the ninth mapping's key839     * @param v9 the ninth mapping's value840     * @param k10 the tenth mapping's key841     * @param v10 the tenth mapping's value842     * @return a {@code Map} containing the specified mappings843     * @throws IllegalArgumentException if there are any duplicate keys844     * @throws NullPointerException if any key or value is {@code null}845     *846     * @since 9847     */848    static <K, V> java.util.Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5,849                                         K k6, V v6, K k7, V v7, K k8, V v8, K k9, V v9, K k10, V v10) {850      return new ImmutableCollections.MapN<>(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5,851                                             k6, v6, k7, v7, k8, v8, k9, v9, k10, v10);852    }853    /**854     * Returns an unmodifiable map containing keys and values extracted from the given entries.855     * The entries themselves are not stored in the map.856     * See <a href="#unmodifiable">Unmodifiable Maps</a> for details.857     *858     * @apiNote859     * It is convenient to create the map entries using the {@link java.util.Map#entry Map.entry()} method.860     * For example,861     *862     * <pre>{@code863     *     import static java.util.Map.entry;864     *865     *     Map<Integer,String> map = Map.ofEntries(866     *         entry(1, "a"),867     *         entry(2, "b"),868     *         entry(3, "c"),869     *         ...870     *         entry(26, "z"));871     * }</pre>872     *873     * @param <K> the {@code Map}'s key type874     * @param <V> the {@code Map}'s value type875     * @param entries {@code Map.Entry}s containing the keys and values from which the map is populated876     * @return a {@code Map} containing the specified mappings877     * @throws IllegalArgumentException if there are any duplicate keys878     * @throws NullPointerException if any entry, key, or value is {@code null}, or if879     *         the {@code entries} array is {@code null}880     *881     * @see java.util.Map#entry Map.entry()882     * @since 9883     */884    @SafeVarargs885    @SuppressWarnings("varargs")886    static <K, V> java.util.Map<K, V> ofEntries(java.util.Map.Entry<? extends K, ? extends V>... entries) {887      if (entries.length == 0) { // implicit null check of entries array888        return ImmutableCollections.emptyMap();889      } else if (entries.length == 1) {890        // implicit null check of the array slot891        return new ImmutableCollections.Map1<>(entries[0].getKey(),892                                               entries[0].getValue());893      } else {894        Object[] kva = new Object[entries.length << 1];895        int a = 0;896        for (java.util.Map.Entry<? extends K, ? extends V> entry : entries) {897          // implicit null checks of each array slot898          kva[a++] = entry.getKey();899          kva[a++] = entry.getValue();900        }901        return new ImmutableCollections.MapN<>(kva);902      }903    }904    /**905     * Returns an unmodifiable {@link java.util.Map.Entry} containing the given key and value.906     * These entries are suitable for populating {@code Map} instances using the907     * {@link java.util.Map#ofEntries Map.ofEntries()} method.908     * The {@code Entry} instances created by this method have the following characteristics:909     *910     * <ul>911     * <li>They disallow {@code null} keys and values. Attempts to create them using a {@code null}912     * key or value result in {@code NullPointerException}.913     * <li>They are unmodifiable. Calls to {@link java.util.Map.Entry#setValue Entry.setValue()}914     * on a returned {@code Entry} result in {@code UnsupportedOperationException}.915     * <li>They are not serializable.916     * <li>They are <a href="../lang/doc-files/ValueBased.html">value-based</a>.917     * Callers should make no assumptions about the identity of the returned instances.918     * This method is free to create new instances or reuse existing ones. Therefore,919     * identity-sensitive operations on these instances (reference equality ({@code ==}),920     * identity hash code, and synchronization) are unreliable and should be avoided.921     * </ul>922     *923     * @apiNote924     * For a serializable {@code Entry}, see {@link AbstractMap.SimpleEntry} or925     * {@link AbstractMap.SimpleImmutableEntry}.926     *927     * @param <K> the key's type928     * @param <V> the value's type929     * @param k the key930     * @param v the value931     * @return an {@code Entry} containing the specified key and value932     * @throws NullPointerException if the key or value is {@code null}933     *934     * @see java.util.Map#ofEntries Map.ofEntries()935     * @since 9936     */937    static <K, V> java.util.Map.Entry<K, V> entry(K k, V v) {938      // KeyValueHolder checks for nulls939      return new KeyValueHolder<>(k, v);940    }941    /**942     * Returns an <a href="#unmodifiable">unmodifiable Map</a> containing the entries943     * of the given Map. The given Map must not be null, and it must not contain any944     * null keys or values. If the given Map is subsequently modified, the returned945     * Map will not reflect such modifications.946     *947     * @implNote948     * If the given Map is an <a href="#unmodifiable">unmodifiable Map</a>,949     * calling copyOf will generally not create a copy.950     *951     * @param <K> the {@code Map}'s key type952     * @param <V> the {@code Map}'s value type953     * @param map a {@code Map} from which entries are drawn, must be non-null954     * @return a {@code Map} containing the entries of the given {@code Map}955     * @throws NullPointerException if map is null, or if it contains any null keys or values956     * @since 10957     */958    @SuppressWarnings({ "rawtypes", "unchecked" })959    static <K, V> java.util.Map<K, V> copyOf(java.util.Map<? extends K, ? extends V> map) {960      if (map instanceof ImmutableCollections.AbstractImmutableMap) {961        return (java.util.Map<K, V>) map;962      } else {963        return Map.ofEntries(map.entrySet().toArray(new java.util.Map.Entry[0]));964      }965    }966  }967}...

Source:ImmutableCollections.java

...34import java.util.function.Function;35import java.util.function.Predicate;36import java.util.function.UnaryOperator;37/**38 * Copied from {@code java.util.ImmutableCollections}.39 * 40 * Container class for immutable collections. Not part of the public API.41 * Mainly for namespace management and shared infrastructure.42 *43 * Serial warnings are suppressed throughout because all implementation44 * classes use a serial proxy and thus have no need to declare serialVersionUID.45 */46class ImmutableCollections {47  /**48   * A "salt" value used for randomizing iteration order. This is initialized once49   * and stays constant for the lifetime of the JVM. It need not be truly random, but50   * it needs to vary sufficiently from one run to the next so that iteration order51   * will vary between JVM runs.52   */53  static final int SALT;54  static {55    long nt = System.nanoTime();56    SALT = (int) ((nt >>> 32) ^ nt);57  }58  /** No instances. */59  private ImmutableCollections() {}60  /**61   * The reciprocal of load factor. Given a number of elements62   * to store, multiply by this factor to get the table size.63   */64  static final int EXPAND_FACTOR = 2;65  static UnsupportedOperationException uoe() {66    return new UnsupportedOperationException();67  }68  static abstract class AbstractImmutableCollection<E> extends AbstractCollection<E> {69    // all mutating methods throw UnsupportedOperationException70    @Override71    public boolean add(E e) {72      throw uoe();73    }74    @Override75    public boolean addAll(Collection<? extends E> c) {76      throw uoe();77    }78    @Override79    public void clear() {80      throw uoe();81    }82    @Override83    public boolean remove(Object o) {84      throw uoe();85    }86    @Override87    public boolean removeAll(Collection<?> c) {88      throw uoe();89    }90    @Override91    public boolean removeIf(Predicate<? super E> filter) {92      throw uoe();93    }94    @Override95    public boolean retainAll(Collection<?> c) {96      throw uoe();97    }98  }99  // ---------- List Implementations ----------100  // make a copy, short-circuiting based on implementation class101  @SuppressWarnings("unchecked")102  static <E> List<E> listCopy(Collection<? extends E> coll) {103    if (coll instanceof AbstractImmutableList && coll.getClass() != SubList.class) {104      return (List<E>) coll;105    } else {106      return (List<E>) Jdk11.List.of(coll.toArray());107    }108  }109  @SuppressWarnings("unchecked")110  static <E> List<E> emptyList() {111    return (List<E>) ListN.EMPTY_LIST;112  }113  static abstract class AbstractImmutableList<E> extends AbstractImmutableCollection<E>114      implements List<E>, RandomAccess {115    // all mutating methods throw UnsupportedOperationException116    @Override117    public void add(int index, E element) {118      throw uoe();119    }120    @Override121    public boolean addAll(int index, Collection<? extends E> c) {122      throw uoe();123    }124    @Override125    public E remove(int index) {126      throw uoe();127    }128    @Override129    public void replaceAll(UnaryOperator<E> operator) {130      throw uoe();131    }132    @Override133    public E set(int index, E element) {134      throw uoe();135    }136    @Override137    public void sort(Comparator<? super E> c) {138      throw uoe();139    }140    @Override141    public List<E> subList(int fromIndex, int toIndex) {142      int size = size();143      subListRangeCheck(fromIndex, toIndex, size);144      return SubList.fromList(this, fromIndex, toIndex);145    }146    static void subListRangeCheck(int fromIndex, int toIndex, int size) {147      if (fromIndex < 0)148        throw new IndexOutOfBoundsException("fromIndex = " + fromIndex);149      if (toIndex > size)150        throw new IndexOutOfBoundsException("toIndex = " + toIndex);151      if (fromIndex > toIndex)152        throw new IllegalArgumentException("fromIndex(" + fromIndex +153                                           ") > toIndex(" + toIndex + ")");154    }155    @Override156    public Iterator<E> iterator() {157      return new ListItr<E>(this, size());158    }159    @Override160    public ListIterator<E> listIterator() {161      return listIterator(0);162    }163    @Override164    public ListIterator<E> listIterator(final int index) {165      int size = size();166      if (index < 0 || index > size) {167        throw outOfBounds(index);168      }169      return new ListItr<E>(this, size, index);170    }171    @Override172    public boolean equals(Object o) {173      if (o == this) {174        return true;175      }176      if (!(o instanceof List)) {177        return false;178      }179      Iterator<?> oit = ((List<?>) o).iterator();180      for (int i = 0, s = size(); i < s; i++) {181        if (!oit.hasNext() || !get(i).equals(oit.next())) {182          return false;183        }184      }185      return !oit.hasNext();186    }187    @Override188    public int indexOf(Object o) {189      Objects.requireNonNull(o);190      for (int i = 0, s = size(); i < s; i++) {191        if (o.equals(get(i))) {192          return i;193        }194      }195      return -1;196    }197    @Override198    public int lastIndexOf(Object o) {199      Objects.requireNonNull(o);200      for (int i = size() - 1; i >= 0; i--) {201        if (o.equals(get(i))) {202          return i;203        }204      }205      return -1;206    }207    @Override208    public int hashCode() {209      int hash = 1;210      for (int i = 0, s = size(); i < s; i++) {211        hash = 31 * hash + get(i).hashCode();212      }213      return hash;214    }215    @Override216    public boolean contains(Object o) {217      return indexOf(o) >= 0;218    }219    IndexOutOfBoundsException outOfBounds(int index) {220      return new IndexOutOfBoundsException("Index: " + index + " Size: " + size());221    }222  }223  static final class ListItr<E> implements ListIterator<E> {224    private final List<E> list;225    private final int size;226    private final boolean isListIterator;227    private int cursor;228    ListItr(List<E> list, int size) {229      this.list = list;230      this.size = size;231      this.cursor = 0;232      isListIterator = false;233    }234    ListItr(List<E> list, int size, int index) {235      this.list = list;236      this.size = size;237      this.cursor = index;238      isListIterator = true;239    }240    public boolean hasNext() {241      return cursor != size;242    }243    public E next() {244      try {245        int i = cursor;246        E next = list.get(i);247        cursor = i + 1;248        return next;249      } catch (IndexOutOfBoundsException e) {250        throw new NoSuchElementException();251      }252    }253    public void remove() {254      throw uoe();255    }256    public boolean hasPrevious() {257      if (!isListIterator) {258        throw uoe();259      }260      return cursor != 0;261    }262    public E previous() {263      if (!isListIterator) {264        throw uoe();265      }266      try {267        int i = cursor - 1;268        E previous = list.get(i);269        cursor = i;270        return previous;271      } catch (IndexOutOfBoundsException e) {272        throw new NoSuchElementException();273      }274    }275    public int nextIndex() {276      if (!isListIterator) {277        throw uoe();278      }279      return cursor;280    }281    public int previousIndex() {282      if (!isListIterator) {283        throw uoe();284      }285      return cursor - 1;286    }287    public void set(E e) {288      throw uoe();289    }290    public void add(E e) {291      throw uoe();292    }293  }294  static final class SubList<E> extends AbstractImmutableList<E>295      implements RandomAccess {296    private final List<E> root;297    private final int offset;298    private final int size;299    private SubList(List<E> root, int offset, int size) {300      this.root = root;301      this.offset = offset;302      this.size = size;303    }304    /**305     * Constructs a sublist of another SubList.306     */307    static <E> SubList<E> fromSubList(SubList<E> parent, int fromIndex, int toIndex) {308      return new SubList<>(parent.root, parent.offset + fromIndex, toIndex - fromIndex);309    }310    /**311     * Constructs a sublist of an arbitrary AbstractImmutableList, which is312     * not a SubList itself.313     */314    static <E> SubList<E> fromList(List<E> list, int fromIndex, int toIndex) {315      return new SubList<>(list, fromIndex, toIndex - fromIndex);316    }317    public E get(int index) {318      // Replacement for Objects.checkIndex(index, size);319      if (index < 0 || index >= size) {320        throw new IndexOutOfBoundsException(String.format("Index %s out of bounds for length %s", index, size));321      }322      return root.get(offset + index);323    }324    public int size() {325      return size;326    }327    public Iterator<E> iterator() {328      return new ListItr<>(this, size());329    }330    public ListIterator<E> listIterator(int index) {331      rangeCheck(index);332      return new ListItr<>(this, size(), index);333    }334    public List<E> subList(int fromIndex, int toIndex) {335      subListRangeCheck(fromIndex, toIndex, size);336      return SubList.fromSubList(this, fromIndex, toIndex);337    }338    private void rangeCheck(int index) {339      if (index < 0 || index > size) {340        throw outOfBounds(index);341      }342    }343  }344  static final class List12<E> extends AbstractImmutableList<E>345      implements Serializable {346    private final E e0;347    private final E e1;348    List12(E e0) {349      this.e0 = Objects.requireNonNull(e0);350      this.e1 = null;351    }352    List12(E e0, E e1) {353      this.e0 = Objects.requireNonNull(e0);354      this.e1 = Objects.requireNonNull(e1);355    }356    @Override357    public int size() {358      return e1 != null ? 2 : 1;359    }360    @Override361    public E get(int index) {362      if (index == 0) {363        return e0;364      } else if (index == 1 && e1 != null) {365        return e1;366      }367      throw outOfBounds(index);368    }369    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {370      throw new InvalidObjectException("not serial proxy");371    }372    private Object writeReplace() {373      if (e1 == null) {374        return new CollSer(CollSer.IMM_LIST, e0);375      } else {376        return new CollSer(CollSer.IMM_LIST, e0, e1);377      }378    }379  }380  static final class ListN<E> extends AbstractImmutableList<E>381      implements Serializable {382    // EMPTY_LIST may be initialized from the CDS archive.383    static List<?> EMPTY_LIST;384    static {385      // VM.initializeFromArchive(ListN.class);386      if (EMPTY_LIST == null) {387        EMPTY_LIST = new ListN<>();388      }389    }390    private final E[] elements;391    @SafeVarargs392    ListN(E... input) {393      // copy and check manually to avoid TOCTOU394      @SuppressWarnings("unchecked")395      E[] tmp = (E[]) new Object[input.length]; // implicit nullcheck of input396      for (int i = 0; i < input.length; i++) {397        tmp[i] = Objects.requireNonNull(input[i]);398      }399      elements = tmp;400    }401    @Override402    public boolean isEmpty() {403      return size() == 0;404    }405    @Override406    public int size() {407      return elements.length;408    }409    @Override410    public E get(int index) {411      return elements[index];412    }413    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {414      throw new InvalidObjectException("not serial proxy");415    }416    private Object writeReplace() {417      return new CollSer(CollSer.IMM_LIST, elements);418    }419  }420  // ---------- Set Implementations ----------421  static abstract class AbstractImmutableSet<E> extends AbstractImmutableCollection<E>422      implements Set<E> {423    @Override424    public boolean equals(Object o) {425      if (o == this) {426        return true;427      } else if (!(o instanceof Set)) {428        return false;429      }430      Collection<?> c = (Collection<?>) o;431      if (c.size() != size()) {432        return false;433      }434      for (Object e : c) {435        if (e == null || !contains(e)) {436          return false;437        }438      }439      return true;440    }441    @Override442    public abstract int hashCode();443  }444  @SuppressWarnings("unchecked")445  static <E> Set<E> emptySet() {446    return (Set<E>) SetN.EMPTY_SET;447  }448  static final class Set12<E> extends AbstractImmutableSet<E>449      implements Serializable {450    final E e0;451    final E e1;452    Set12(E e0) {453      this.e0 = Objects.requireNonNull(e0);454      this.e1 = null;455    }456    Set12(E e0, E e1) {457      if (e0.equals(Objects.requireNonNull(e1))) { // implicit nullcheck of e0458        throw new IllegalArgumentException("duplicate element: " + e0);459      }460      this.e0 = e0;461      this.e1 = e1;462    }463    @Override464    public int size() {465      return (e1 == null) ? 1 : 2;466    }467    @Override468    public boolean contains(Object o) {469      return o.equals(e0) || o.equals(e1); // implicit nullcheck of o470    }471    @Override472    public int hashCode() {473      return e0.hashCode() + (e1 == null ? 0 : e1.hashCode());474    }475    @Override476    public Iterator<E> iterator() {477      return new Iterator<E>() {478        private int idx = size();479        @Override480        public boolean hasNext() {481          return idx > 0;482        }483        @Override484        public E next() {485          if (idx == 1) {486            idx = 0;487            return SALT >= 0 || e1 == null ? e0 : e1;488          } else if (idx == 2) {489            idx = 1;490            return SALT >= 0 ? e1 : e0;491          } else {492            throw new NoSuchElementException();493          }494        }495      };496    }497    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {498      throw new InvalidObjectException("not serial proxy");499    }500    private Object writeReplace() {501      if (e1 == null) {502        return new CollSer(CollSer.IMM_SET, e0);503      } else {504        return new CollSer(CollSer.IMM_SET, e0, e1);505      }506    }507  }508  /**509   * An array-based Set implementation. The element array must be strictly510   * larger than the size (the number of contained elements) so that at511   * least one null is always present.512   * @param <E> the element type513   */514  static final class SetN<E> extends AbstractImmutableSet<E>515      implements Serializable {516    // EMPTY_SET may be initialized from the CDS archive.517    static Set<?> EMPTY_SET;518    static {519      // VM.initializeFromArchive(SetN.class);520      if (EMPTY_SET == null) {521        EMPTY_SET = new SetN<>();522      }523    }524    final E[] elements;525    final int size;526    @SafeVarargs527    @SuppressWarnings("unchecked")528    SetN(E... input) {529      size = input.length; // implicit nullcheck of input530      elements = (E[]) new Object[EXPAND_FACTOR * input.length];531      for (int i = 0; i < input.length; i++) {532        E e = input[i];533        int idx = probe(e); // implicit nullcheck of e534        if (idx >= 0) {535          throw new IllegalArgumentException("duplicate element: " + e);536        } else {537          elements[-(idx + 1)] = e;538        }539      }540    }541    @Override542    public int size() {543      return size;544    }545    @Override546    public boolean contains(Object o) {547      Objects.requireNonNull(o);548      return size > 0 && probe(o) >= 0;549    }550    private final class SetNIterator implements Iterator<E> {551      private int remaining;552      private int idx;553      SetNIterator() {554        remaining = size();555        if (remaining > 0) {556          idx = Math.floorMod(SALT, elements.length);557        }558      }559      @Override560      public boolean hasNext() {561        return remaining > 0;562      }563      private int nextIndex() {564        int idx = this.idx;565        if (SALT >= 0) {566          if (++idx >= elements.length) {567            idx = 0;568          }569        } else {570          if (--idx < 0) {571            idx = elements.length - 1;572          }573        }574        return this.idx = idx;575      }576      @Override577      public E next() {578        if (hasNext()) {579          E element;580          // skip null elements581          while ((element = elements[nextIndex()]) == null) {}582          remaining--;583          return element;584        } else {585          throw new NoSuchElementException();586        }587      }588    }589    @Override590    public Iterator<E> iterator() {591      return new SetN<E>.SetNIterator();592    }593    @Override594    public int hashCode() {595      int h = 0;596      for (E e : elements) {597        if (e != null) {598          h += e.hashCode();599        }600      }601      return h;602    }603    // returns index at which element is present; or if absent,604    // (-i - 1) where i is location where element should be inserted.605    // Callers are relying on this method to perform an implicit nullcheck606    // of pe607    private int probe(Object pe) {608      int idx = Math.floorMod(pe.hashCode(), elements.length);609      while (true) {610        E ee = elements[idx];611        if (ee == null) {612          return -idx - 1;613        } else if (pe.equals(ee)) {614          return idx;615        } else if (++idx == elements.length) {616          idx = 0;617        }618      }619    }620    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {621      throw new InvalidObjectException("not serial proxy");622    }623    private Object writeReplace() {624      Object[] array = new Object[size];625      int dest = 0;626      for (Object o : elements) {627        if (o != null) {628          array[dest++] = o;629        }630      }631      return new CollSer(CollSer.IMM_SET, array);632    }633  }634  // ---------- Map Implementations ----------635  @SuppressWarnings("unchecked")636  static <K, V> Map<K, V> emptyMap() {637    return (Map<K, V>) MapN.EMPTY_MAP;638  }639  abstract static class AbstractImmutableMap<K, V> extends AbstractMap<K, V> implements Serializable {640    @Override641    public void clear() {642      throw uoe();643    }644    @Override645    public V compute(K key, BiFunction<? super K, ? super V, ? extends V> rf) {646      throw uoe();647    }648    @Override649    public V computeIfAbsent(K key, Function<? super K, ? extends V> mf) {650      throw uoe();651    }652    @Override653    public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> rf) {654      throw uoe();655    }656    @Override657    public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> rf) {658      throw uoe();659    }660    @Override661    public V put(K key, V value) {662      throw uoe();663    }664    @Override665    public void putAll(Map<? extends K, ? extends V> m) {666      throw uoe();667    }668    @Override669    public V putIfAbsent(K key, V value) {670      throw uoe();671    }672    @Override673    public V remove(Object key) {674      throw uoe();675    }676    @Override677    public boolean remove(Object key, Object value) {678      throw uoe();679    }680    @Override681    public V replace(K key, V value) {682      throw uoe();683    }684    @Override685    public boolean replace(K key, V oldValue, V newValue) {686      throw uoe();687    }688    @Override689    public void replaceAll(BiFunction<? super K, ? super V, ? extends V> f) {690      throw uoe();691    }692  }693  static final class Map1<K, V> extends AbstractImmutableMap<K, V> {694    private final K k0;695    private final V v0;696    Map1(K k0, V v0) {697      this.k0 = Objects.requireNonNull(k0);698      this.v0 = Objects.requireNonNull(v0);699    }700    @Override701    public Set<Map.Entry<K, V>> entrySet() {702      return Jdk11.Set.of(new KeyValueHolder<>(k0, v0));703    }704    @Override705    public V get(Object o) {706      return o.equals(k0) ? v0 : null; // implicit nullcheck of o707    }708    @Override709    public boolean containsKey(Object o) {710      return o.equals(k0); // implicit nullcheck of o711    }712    @Override713    public boolean containsValue(Object o) {714      return o.equals(v0); // implicit nullcheck of o715    }716    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {717      throw new InvalidObjectException("not serial proxy");718    }719    private Object writeReplace() {720      return new CollSer(CollSer.IMM_MAP, k0, v0);721    }722    @Override723    public int hashCode() {724      return k0.hashCode() ^ v0.hashCode();725    }726  }727  /**728   * An array-based Map implementation. There is a single array "table" that729   * contains keys and values interleaved: table[0] is kA, table[1] is vA,730   * table[2] is kB, table[3] is vB, etc. The table size must be even. It must731   * also be strictly larger than the size (the number of key-value pairs contained732   * in the map) so that at least one null key is always present.733   * @param <K> the key type734   * @param <V> the value type735   */736  static final class MapN<K, V> extends AbstractImmutableMap<K, V> {737    // EMPTY_MAP may be initialized from the CDS archive.738    static Map<?, ?> EMPTY_MAP;739    static {740      // VM.initializeFromArchive(MapN.class);741      EMPTY_MAP = new MapN<>();742    }743    final Object[] table; // pairs of key, value744    final int size; // number of pairs745    MapN(Object... input) {746      if ((input.length & 1) != 0) { // implicit nullcheck of input747        throw new InternalError("length is odd");748      }749      size = input.length >> 1;750      int len = EXPAND_FACTOR * input.length;751      len = (len + 1) & ~1; // ensure table is even length752      table = new Object[len];753      for (int i = 0; i < input.length; i += 2) {754        @SuppressWarnings("unchecked")755        K k = Objects.requireNonNull((K) input[i]);756        @SuppressWarnings("unchecked")757        V v = Objects.requireNonNull((V) input[i + 1]);758        int idx = probe(k);759        if (idx >= 0) {760          throw new IllegalArgumentException("duplicate key: " + k);761        } else {762          int dest = -(idx + 1);763          table[dest] = k;764          table[dest + 1] = v;765        }766      }767    }768    @Override769    public boolean containsKey(Object o) {770      Objects.requireNonNull(o);771      return size > 0 && probe(o) >= 0;772    }773    @Override774    public boolean containsValue(Object o) {775      Objects.requireNonNull(o);776      for (int i = 1; i < table.length; i += 2) {777        Object v = table[i];778        if (v != null && o.equals(v)) {779          return true;780        }781      }782      return false;783    }784    @Override785    public int hashCode() {786      int hash = 0;787      for (int i = 0; i < table.length; i += 2) {788        Object k = table[i];789        if (k != null) {790          hash += k.hashCode() ^ table[i + 1].hashCode();791        }792      }793      return hash;794    }795    @Override796    @SuppressWarnings("unchecked")797    public V get(Object o) {798      if (size == 0) {799        Objects.requireNonNull(o);800        return null;801      }802      int i = probe(o);803      if (i >= 0) {804        return (V) table[i + 1];805      } else {806        return null;807      }808    }809    @Override810    public int size() {811      return size;812    }813    class MapNIterator implements Iterator<Map.Entry<K, V>> {814      private int remaining;815      private int idx;816      MapNIterator() {817        remaining = size();818        if (remaining > 0) {819          idx = Math.floorMod(SALT, table.length >> 1) << 1;820        }821      }822      @Override823      public boolean hasNext() {824        return remaining > 0;825      }826      private int nextIndex() {827        int idx = this.idx;828        if (SALT >= 0) {829          if ((idx += 2) >= table.length) {830            idx = 0;831          }832        } else {833          if ((idx -= 2) < 0) {834            idx = table.length - 2;835          }836        }837        return this.idx = idx;838      }839      @Override840      public Map.Entry<K, V> next() {841        if (hasNext()) {842          while (table[nextIndex()] == null) {}843          @SuppressWarnings("unchecked")844          Map.Entry<K, V> e = new KeyValueHolder<>((K) table[idx], (V) table[idx + 1]);845          remaining--;846          return e;847        } else {848          throw new NoSuchElementException();849        }850      }851    }852    @Override853    public Set<Map.Entry<K, V>> entrySet() {854      return new AbstractSet<Map.Entry<K, V>>() {855        @Override856        public int size() {857          return MapN.this.size;858        }859        @Override860        public Iterator<Map.Entry<K, V>> iterator() {861          return new MapNIterator();862        }863      };864    }865    // returns index at which the probe key is present; or if absent,866    // (-i - 1) where i is location where element should be inserted.867    // Callers are relying on this method to perform an implicit nullcheck868    // of pk.869    private int probe(Object pk) {870      int idx = Math.floorMod(pk.hashCode(), table.length >> 1) << 1;871      while (true) {872        @SuppressWarnings("unchecked")873        K ek = (K) table[idx];874        if (ek == null) {875          return -idx - 1;876        } else if (pk.equals(ek)) {877          return idx;878        } else if ((idx += 2) == table.length) {879          idx = 0;880        }881      }882    }883    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {884      throw new InvalidObjectException("not serial proxy");885    }886    private Object writeReplace() {887      Object[] array = new Object[2 * size];888      int len = table.length;889      int dest = 0;890      for (int i = 0; i < len; i += 2) {891        if (table[i] != null) {892          array[dest++] = table[i];893          array[dest++] = table[i + 1];894        }895      }896      return new CollSer(CollSer.IMM_MAP, array);897    }898  }899}900// ---------- Serialization Proxy ----------901/**902 * Copied from {@code java.util.CollSer}.903 * 904 * A unified serialization proxy class for the immutable collections.905 *906 * @serial907 * @since 9908 */909final class CollSer implements Serializable {910  private static final long serialVersionUID = 6309168927139932177L;911  static final int IMM_LIST = 1;912  static final int IMM_SET = 2;913  static final int IMM_MAP = 3;914  /**915   * Indicates the type of collection that is serialized.916   * The low order 8 bits have the value 1 for an immutable917   * {@code List}, 2 for an immutable {@code Set}, and 3 for918   * an immutable {@code Map}. Any other value causes an919   * {@link InvalidObjectException} to be thrown. The high920   * order 24 bits are zero when an instance is serialized,921   * and they are ignored when an instance is deserialized.922   * They can thus be used by future implementations without923   * causing compatibility issues.924   *925   * <p>The tag value also determines the interpretation of the926   * transient {@code Object[] array} field.927   * For {@code List} and {@code Set}, the array's length is the size928   * of the collection, and the array contains the elements of the collection.929   * Null elements are not allowed. For {@code Set}, duplicate elements930   * are not allowed.931   *932   * <p>For {@code Map}, the array's length is twice the number of mappings933   * present in the map. The array length is necessarily even.934   * The array contains a succession of key and value pairs:935   * {@code k1, v1, k2, v2, ..., kN, vN.} Nulls are not allowed,936   * and duplicate keys are not allowed.937   *938   * @serial939   * @since 9940   */941  private final int tag;942  /**943   * @serial944   * @since 9945   */946  private transient Object[] array;947  CollSer(int t, Object... a) {948    tag = t;949    array = a;950  }951  /**952   * Reads objects from the stream and stores them953   * in the transient {@code Object[] array} field.954   *955   * @serialData956   * A nonnegative int, indicating the count of objects,957   * followed by that many objects.958   *959   * @param ois the ObjectInputStream from which data is read960   * @throws IOException if an I/O error occurs961   * @throws ClassNotFoundException if a serialized class cannot be loaded962   * @throws InvalidObjectException if the count is negative963   * @since 9964   */965  private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {966    ois.defaultReadObject();967    int len = ois.readInt();968    if (len < 0) {969      throw new InvalidObjectException("negative length " + len);970    }971    // SharedSecrets.getJavaObjectInputStreamAccess().checkArray(ois, Object[].class, len);972    Object[] a = new Object[len];973    for (int i = 0; i < len; i++) {974      a[i] = ois.readObject();975    }976    array = a;977  }978  /**979   * Writes objects to the stream from980   * the transient {@code Object[] array} field.981   *982   * @serialData983   * A nonnegative int, indicating the count of objects,984   * followed by that many objects.985   *986   * @param oos the ObjectOutputStream to which data is written987   * @throws IOException if an I/O error occurs988   * @since 9989   */990  private void writeObject(ObjectOutputStream oos) throws IOException {991    oos.defaultWriteObject();992    oos.writeInt(array.length);993    for (int i = 0; i < array.length; i++) {994      oos.writeObject(array[i]);995    }996  }997  /**998   * Creates and returns an immutable collection from this proxy class.999   * The instance returned is created as if by calling one of the1000   * static factory methods for1001   * <a href="List.html#immutable">List</a>,1002   * <a href="Map.html#immutable">Map</a>, or1003   * <a href="Set.html#immutable">Set</a>.1004   * This proxy class is the serial form for all immutable collection instances,1005   * regardless of implementation type. This is necessary to ensure that the1006   * existence of any particular implementation type is kept out of the1007   * serialized form.1008   *1009   * @return a collection created from this proxy object1010   * @throws InvalidObjectException if the tag value is illegal or if an exception1011   *         is thrown during creation of the collection1012   * @throws ObjectStreamException if another serialization error has occurred1013   * @since 91014   */1015  private Object readResolve() throws ObjectStreamException {1016    try {1017      if (array == null) {1018        throw new InvalidObjectException("null array");1019      }1020      // use low order 8 bits to indicate "kind"1021      // ignore high order 24 bits1022      switch (tag & 0xff) {1023      case IMM_LIST:1024        return Jdk11.List.of(array);1025      case IMM_SET:1026        return Jdk11.Set.of(array);1027      case IMM_MAP:1028        if (array.length == 0) {1029          return ImmutableCollections.emptyMap();1030        } else if (array.length == 2) {1031          return new ImmutableCollections.Map1<>(array[0], array[1]);1032        } else {1033          return new ImmutableCollections.MapN<>(array);1034        }1035      default:1036        throw new InvalidObjectException(String.format("invalid flags 0x%x", tag));1037      }1038    } catch (NullPointerException | IllegalArgumentException ex) {1039      InvalidObjectException ioe = new InvalidObjectException("invalid object");1040      ioe.initCause(ex);1041      throw ioe;1042    }1043  }1044}...

ImmutableCollections

Using AI Code Generation

1import org.assertj.core.test.jdk11.ImmutableCollections;2import java.util.List;3public class 1 {4    public static void main(String[] args) {5        List<Integer> list = ImmutableCollections.listOf(1, 2, 3);6        list.forEach(System.out::println);7    }8}9import org.assertj.core.test.jdk11.ImmutableCollections;10import java.util.List;11public class 2 {12    public static void main(String[] args) {13        List<Integer> list = ImmutableCollections.listOf(1, 2, 3);14        list.forEach(System.out::println);15    }16}17import org.assertj.core.test.jdk11.ImmutableCollections;18import java.util.List;19public class 3 {20    public static void main(String[] args) {21        List<Integer> list = ImmutableCollections.listOf(1, 2, 3);22        list.forEach(System.out::println);23    }24}25import org.assertj.core.test.jdk11.ImmutableCollections;26import java.util.List;27public class 4 {28    public static void main(String[] args) {29        List<Integer> list = ImmutableCollections.listOf(1, 2, 3);30        list.forEach(System.out::println);31    }32}33	at 3.main(3.java:6)34	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)35	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)36	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)

ImmutableCollections

Using AI Code Generation

1import org.assertj.core.test.jdk11.ImmutableCollections;2import java.util.List;3public class ImmutableCollectionsTest {4public static void main(String[] args) {5List<Integer> list = ImmutableCollections.of(1, 2, 3);6System.out.println(list);7}8}

ImmutableCollections

Using AI Code Generation

1import org.assertj.core.test.jdk11.ImmutableCollections;2import java.util.List;3public class Test {4  public static void main(String[] args) {5    List<Integer> list = ImmutableCollections.of(1, 2, 3);6    System.out.println(list);7  }8}9    List<Integer> list = ImmutableCollections.of(1, 2, 3);10  symbol:   method of(int,int,int)11    List<Integer> list = ImmutableCollections.of(1, 2, 3);12  symbol:   method of(int,int,int)13    List<Integer> list = ImmutableCollections.of(1, 2, 3);14  symbol:   method of(int,int,int)

ImmutableCollections

Using AI Code Generation

1import org.assertj.core.test.jdk11.ImmutableCollections;2import java.util.List;3import java.util.Set;4import java.util.Map;5import java.util.stream.Collectors;6import java.util.stream.Stream;7import java.util.stream.IntStream;8import java.util.stream.DoubleStream;9import java.util.stream.LongStream;10import java.util.stream.StreamSupport;11import java.util.stream.Stream.Builder;12import java.util.stream.DoubleStream.Builder;13import java.util.stream.IntStream.Builder;14import java.util.stream.LongStream.Builder;15import java.util.stream.Stream.Builder;16import java.util.stream.Collectors;

ImmutableCollections

Using AI Code Generation

1import org.assertj.core.test.jdk11.ImmutableCollections;2import java.util.List;3public class 1 {4    public static void main(String[] args) {5        List<String> list = ImmutableCollections.of("a", "b", "c");6        list.forEach(System.out::println);7    }8}

ImmutableCollections

Using AI Code Generation

1import org.assertj.core.test.jdk11.ImmutableCollections;2import java.util.List;3import java.util.Set;4public class ImmutableCollectionsTest {5    public static void main(String[] args) {6        List<String> list = ImmutableCollections.listOf("one", "two", "three");7        Set<String> set = ImmutableCollections.setOf("one", "two", "three");8        System.out.println(list);9        System.out.println(set);10    }11}12ImmutableList.copyOf()13ImmutableList.of()14ImmutableList.builder()15Example 1: Using ImmutableList.copyOf()16import com.google.common.collect.ImmutableList;17import java.util.List;18public class ImmutableListTest {19    public static void main(String[] args) {20        List<String> list = List.of("one", "two", "three");21        ImmutableList<String> immutableList = ImmutableList.copyOf(list);22        System.out.println(immutableList);23    }24}25Example 2: Using ImmutableList.of()26import com.google.common.collect.ImmutableList;27public class ImmutableListTest {28    public static void main(String[] args) {29        ImmutableList<String> immutableList = ImmutableList.of("one", "two", "three");30        System.out.println(immutableList);31    }32}33Example 3: Using ImmutableList.builder()34import com.google.common.collect.ImmutableList;35public class ImmutableListTest {36    public static void main(String[] args) {37        ImmutableList<String> immutableList = ImmutableList.<String>builder()38                .add("one")39                .add("two")40                .add("three")41                .build();42        System.out.println(immutableList);43    }44}

ImmutableCollections

Using AI Code Generation

1import static org.assertj.core.test.jdk11.ImmutableCollections.*;2import java.util.*;3class Test {4  public static void main(String[] args) {5    List<String> list = of("a", "b", "c");6    System.out.println(list);7  }8}9import static org.assertj.core.test.jdk11.ImmutableCollections.*;10import java.util.*;11class Test {12  public static void main(String[] args) {13    List<String> list = of("a", "b", "c");14    System.out.println(list);15  }16}17import static org.assertj.core.test.jdk11.ImmutableCollections.*;18import java.util.*;19class Test {20  public static void main(String[] args) {21    List<String> list = of("a", "b", "c");22    System.out.println(list);23  }24}25import static org.assertj.core.test.jdk11.ImmutableCollections.*;26import java.util.*;27class Test {28  public static void main(String[] args) {29    List<String> list = of("a", "b", "c");30    System.out.println(list);31  }32}33import static org.assertj.core.test.jdk11.ImmutableCollections.*;34import java.util.*;35class Test {36  public static void main(String[] args) {37    List<String> list = of("a", "b", "c");38    System.out.println(list);39  }40}41import static org.assertj.core.test.jdk11.ImmutableCollections.*;42import java.util.*;43class Test {44  public static void main(String[] args) {45    List<String> list = of("a", "b", "c");46    System.out.println(list);47  }48}49import static org.assertj.core.test.jdk11.ImmutableCollections.*;50import java.util.*;

ImmutableCollections

Using AI Code Generation

1package com.guru99.demo;2import java.util.List;3import org.assertj.core.test.jdk11.ImmutableCollections;4public class ImmutableCollectionsTest {5	public static void main(String[] args) {6		List<String> list = ImmutableCollections.listOf("A", "B", "C");7		System.out.println(list);8	}9}

ImmutableCollections

Using AI Code Generation

1import org.assertj.core.test.jdk11.ImmutableCollections;2class Test {3  public static void main(String[] args) {4    ImmutableCollections immutableCollections = new ImmutableCollections();5    immutableCollections.listOf();6  }7}8import org.assertj.core.test.jdk8.ImmutableCollections;9class Test {10  public static void main(String[] args) {11    ImmutableCollections immutableCollections = new ImmutableCollections();12    immutableCollections.listOf();13  }14}15Workaround (if any):

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