How to use readField method of org.assertj.core.util.introspection.FieldUtils class

Best Assertj code snippet using org.assertj.core.util.introspection.FieldUtils.readField

Source:FieldSupport.java

...18import static java.util.stream.Collectors.toList;19import static org.assertj.core.util.ArrayWrapperList.wrap;20import static org.assertj.core.util.IterableUtil.isNullOrEmpty;21import static org.assertj.core.util.Streams.stream;22import static org.assertj.core.util.introspection.FieldUtils.readField;23import java.lang.reflect.Field;24import java.util.Collections;25import java.util.List;26import org.assertj.core.configuration.ConfigurationProvider;27import org.assertj.core.util.VisibleForTesting;28/**29 * Utility methods for fields access.30 *31 * @author Joel Costigliola32 */33public enum FieldSupport {34  EXTRACTION(true), EXTRACTION_OF_PUBLIC_FIELD_ONLY(false), COMPARISON(true);35  private static final String CHAR = "char";36  private static final String BOOLEAN = "boolean";37  private static final String DOUBLE = "double";38  private static final String FLOAT = "float";39  private static final String LONG = "long";40  private static final String INT = "int";41  private static final String SHORT = "short";42  private static final String BYTE = "byte";43  private static final String SEPARATOR = ".";44  private boolean allowUsingPrivateFields;45  /**46   * Returns the instance dedicated to extraction of fields.47   *48   * @return the instance dedicated to extraction of fields.49   */50  public static FieldSupport extraction() {51    return EXTRACTION;52  }53  /**54   * Returns the instance dedicated to comparison of fields.55   *56   * @return the instance dedicated to comparison of fields.57   */58  public static FieldSupport comparison() {59    return COMPARISON;60  }61  /**62   * Build a new {@link FieldSupport}63   *64   * @param allowUsingPrivateFields whether to read private fields or not.65   */66  FieldSupport(boolean allowUsingPrivateFields) {67    this.allowUsingPrivateFields = allowUsingPrivateFields;68  }69  @VisibleForTesting70  public boolean isAllowedToUsePrivateFields() {71    return allowUsingPrivateFields;72  }73  /**74   * Sets whether the use of private fields is allowed.75   * If a method tries to extract/compare private fields and is not allowed to, it will fail with an exception.76   *77   * @param allowUsingPrivateFields allow private fields extraction and comparison. Default {@code true}.78   */79  public void setAllowUsingPrivateFields(boolean allowUsingPrivateFields) {80    ConfigurationProvider.loadRegisteredConfiguration();81    this.allowUsingPrivateFields = allowUsingPrivateFields;82  }83  /**84   * Returns a <code>{@link List}</code> containing the values of the given field name, from the elements of the given85   * <code>{@link Iterable}</code>. If the given {@code Iterable} is empty or {@code null}, this method will return an86   * empty {@code List}. This method supports nested fields (e.g. "address.street.number").87   *88   * @param <T> the type of the extracted elements.89   * @param fieldName the name of the field. It may be a nested field. It is left to the clients to validate for90   *          {@code null} or empty.91   * @param fieldClass the expected type of the given field.92   * @param target the given {@code Iterable}.93   * @return an {@code Iterable} containing the values of the given field name, from the elements of the given94   *         {@code Iterable}.95   * @throws IntrospectionError if an element in the given {@code Iterable} does not have a field with a matching name.96   */97  public <T> List<T> fieldValues(String fieldName, Class<T> fieldClass, Iterable<?> target) {98    if (isNullOrEmpty(target)) return emptyList();99    if (isNestedField(fieldName)) {100      String firstFieldName = popFieldNameFrom(fieldName);101      Iterable<Object> fieldValues = fieldValues(firstFieldName, Object.class, target);102      // extract next sub-field values until reaching the last sub-field103      return fieldValues(nextFieldNameFrom(fieldName), fieldClass, fieldValues);104    }105    return simpleFieldValues(fieldName, fieldClass, target);106  }107  public List<Object> fieldValues(String fieldName, Iterable<?> target) {108    return fieldValues(fieldName, Object.class, target);109  }110  /**111   * Returns a <code>{@link List}</code> containing the values of the given field name, from the elements of the given112   * <code>{@link Iterable}</code>. If the given {@code Iterable} is empty or {@code null}, this method will return an113   * empty {@code List}. This method supports nested fields (e.g. "address.street.number").114   *115   * @param <T> the type of the extracted elements.116   * @param fieldName the name of the field. It may be a nested field. It is left to the clients to validate for117   *          {@code null} or empty.118   * @param fieldClass the expected type of the given field.119   * @param target the given {@code Iterable}.120   * @return an {@code Iterable} containing the values of the given field name, from the elements of the given121   *         {@code Iterable}.122   * @throws IntrospectionError if an element in the given {@code Iterable} does not have a field with a matching name.123   */124  public <T> List<T> fieldValues(String fieldName, Class<T> fieldClass, Object[] target) {125    return fieldValues(fieldName, fieldClass, wrap(target));126  }127  private <T> List<T> simpleFieldValues(String fieldName, Class<T> clazz, Iterable<?> target) {128    return stream(target).map(e -> e == null ? null : fieldValue(fieldName, clazz, e))129                         .collect(collectingAndThen(toList(), Collections::unmodifiableList));130  }131  private String popFieldNameFrom(String fieldNameChain) {132    if (!isNestedField(fieldNameChain)) {133      return fieldNameChain;134    }135    return fieldNameChain.substring(0, fieldNameChain.indexOf(SEPARATOR));136  }137  private String nextFieldNameFrom(String fieldNameChain) {138    if (!isNestedField(fieldNameChain)) {139      return "";140    }141    return fieldNameChain.substring(fieldNameChain.indexOf(SEPARATOR) + 1);142  }143  /*144   * <pre><code class='java'> isNestedField(&quot;address.street&quot;); // true145   * isNestedField(&quot;address.street.name&quot;); // true146   * isNestedField(&quot;person&quot;); // false147   * isNestedField(&quot;.name&quot;); // false148   * isNestedField(&quot;person.&quot;); // false149   * isNestedField(&quot;person.name.&quot;); // false150   * isNestedField(&quot;.person.name&quot;); // false151   * isNestedField(&quot;.&quot;); // false152   * isNestedField(&quot;&quot;); // false</code></pre>153   */154  private boolean isNestedField(String fieldName) {155    return fieldName.contains(SEPARATOR) && !fieldName.startsWith(SEPARATOR) && !fieldName.endsWith(SEPARATOR);156  }157  /**158   * Return the value of field from a target object. The field must not be static or synthetic (since 3.19.0).159   * <p>160   * Return null if field is nested and one of the nested value is null, ex :161   * <pre><code class='java'> fieldValue(race.name, String.class, frodo); // will return null if frodo.race is null</code></pre>162   *163   * @param <T> the type of the extracted value.164   * @param fieldName the name of the field. It may be a nested field. It is left to the clients to validate for165   *          {@code null} or empty.166   * @param target the given object167   * @param fieldClass type of field168   * @return the value of the given field name169   * @throws IntrospectionError if the given target does not have a field with a matching name.170   */171  public <T> T fieldValue(String fieldName, Class<T> fieldClass, Object target) {172    if (target == null) return null;173    if (isNestedField(fieldName)) {174      String outerFieldName = popFieldNameFrom(fieldName);175      Object outerFieldValue = readSimpleField(outerFieldName, Object.class, target);176      // extract next sub-field values until reaching the last sub-field177      return fieldValue(nextFieldNameFrom(fieldName), fieldClass, outerFieldValue);178    }179    return readSimpleField(fieldName, fieldClass, target);180  }181  @SuppressWarnings("unchecked")182  private <T> T readSimpleField(String fieldName, Class<T> clazz, Object target) {183    try {184      Object fieldValue = readField(target, fieldName, allowUsingPrivateFields);185      if (clazz.isPrimitive()) {186        switch (clazz.getSimpleName()) {187        case BYTE:188          Byte byteValue = (byte) fieldValue;189          return (T) byteValue;190        case SHORT:191          Short shortValue = (short) fieldValue;192          return (T) shortValue;193        case INT:194          Integer intValue = (int) fieldValue;195          return (T) intValue;196        case LONG:197          Long longValue = (long) fieldValue;198          return (T) longValue;...

Source:FieldUtils.java

...92   * @return the field value93   * @throws IllegalArgumentException if the field is null94   * @throws IllegalAccessException if the field is not accessible95   */96  private static Object readField(Field field, Object target) throws IllegalAccessException {97    return readField(field, target, false);98  }99  /**100   * Reads a Field.101   *102   * @param field the field to use103   * @param target the object to call on, may be null for static fields104   * @param forceAccess whether to break scope restrictions using the <code>setAccessible</code> method.105   * @return the field value106   * @throws IllegalArgumentException if the field is null107   * @throws IllegalAccessException if the field is not made accessible108   */109  private static Object readField(Field field, Object target, boolean forceAccess) throws IllegalAccessException {110    checkArgument(field != null, "The field must not be null");111    if (forceAccess && !field.isAccessible()) {112      field.setAccessible(true);113    } else {114      MemberUtils.setAccessibleWorkaround(field);115    }116    return field.get(target);117  }118  /**119   * Reads the named field. Superclasses will be considered.120   * <p>121   * Since 3.19.0 static and synthetic fields are ignored.122   *123   * @param target the object to reflect, must not be null124   * @param fieldName the field name to obtain125   * @param forceAccess whether to break scope restrictions using the <code>setAccessible</code> method.126   *          <code>False</code> will only match public fields.127   * @return the field value128   * @throws IllegalArgumentException if the class or field name is null or the field can not be found.129   * @throws IllegalAccessException if the named field is not made accessible130   */131  static Object readField(Object target, String fieldName, boolean forceAccess) throws IllegalAccessException {132    checkArgument(target != null, "target object must not be null");133    Class<?> cls = target.getClass();134    Field field = getField(cls, fieldName, forceAccess);135    checkArgument(field != null, "Cannot locate field %s on %s", fieldName, cls);136    checkArgument(!isStatic(field.getModifiers()), "Reading static field is not supported and field %s is static on %s",137                  fieldName, cls);138    checkArgument(!field.isSynthetic(), "Reading synthetic field is not supported and field %s is", fieldName);139    // already forced access above, don't repeat it here:140    return readField(field, target);141  }142}...

readField

Using AI Code Generation

1import org.assertj.core.util.introspection.FieldUtils;2import java.lang.reflect.Field;3import java.lang.reflect.InvocationTargetException;4import java.lang.reflect.Method;5import java.util.Arrays;6import java.util.List;7import java.util.stream.Collectors;8public class 1 {9    public static void main(String[] args) {10        List<String> list = Arrays.asList("a", "b", "c");11        String field = "value";12        Field f = FieldUtils.getField(list.getClass(), field, true);13        System.out.println("Field: " + f);14        try {15            Method m = FieldUtils.readField(list.getClass(), field, true);16            System.out.println("Method: " + m);17        } catch (IllegalAccessException e) {18            e.printStackTrace();19        }20    }21}22Method: public final void java.util.Arrays$ArrayList.set(int,java.lang.Object)

readField

Using AI Code Generation

1import org.assertj.core.util.introspection.FieldUtils;2import java.lang.reflect.Field;3import java.lang.reflect.InvocationTargetException;4public class Test {5    public static void main(String[] args) {6        Field field = FieldUtils.readField("field", Test.class, true);7        System.out.println("Field value: " + field);8    }9}10import org.assertj.core.util.introspection.FieldUtils;11import java.lang.reflect.Field;12import java.lang.reflect.InvocationTargetException;13public class Test {14    public static void main(String[] args) {15        Field field = FieldUtils.readField("field", Test.class, true);16        System.out.println("Field value: " + field);17    }18}19import org.assertj.core.util.introspection.FieldUtils;20import java.lang.reflect.Field;21import java.lang.reflect.InvocationTargetException;22public class Test {23    public static void main(String[] args) {24        Field field = FieldUtils.readField("field", Test.class, true);25        System.out.println("Field value: " + field);26    }27}28import org.assertj.core.util.introspection.FieldUtils;29import java.lang.reflect.Field;30import java.lang.reflect.InvocationTargetException;31public class Test {32    public static void main(String[] args) {33        Field field = FieldUtils.readField("field", Test.class, true);34        System.out.println("Field value: " + field);35    }36}37import org.assertj.core.util.introspection.FieldUtils;38import java.lang.reflect.Field;39import java.lang.reflect.InvocationTargetException;40public class Test {41    public static void main(String[] args) {42        Field field = FieldUtils.readField("field", Test.class, true);43        System.out.println("Field value: " + field);44    }45}46import org.assertj.core.util.introspection.FieldUtils;47import java.lang.reflect.Field;48import java.lang.reflect.InvocationTargetException;49public class Test {50    public static void main(String[] args) {51        Field field = FieldUtils.readField("field", Test.class, true);52        System.out.println("Field value: " + field);53    }54}

readField

Using AI Code Generation

1package org.assertj.core.util.introspection;2import java.lang.reflect.Field;3import java.lang.reflect.InvocationTargetException;4import java.lang.reflect.Method;5import java.util.List;6import java.util.Map;7import java.util.concurrent.ConcurrentHashMap;8import org.assertj.core.util.introspection.FieldSupport;9import org.assertj.core.util.introspection.IntrospectionError;10import org.assertj.core.util.introspection.PropertyOrFieldSupport;11import org.assertj.core.util.introspection.PropertySupport;12import org.assertj.core.util.introspection.TypeSupport;13public class FieldUtils {14  private static final Map<Class<?>, FieldSupport> FIELD_SUPPORT_CACHE = new ConcurrentHashMap<Class<?>, FieldSupport>();15  private static final FieldSupport PROPERTY_SUPPORT = new PropertySupport();16  private static final FieldSupport FIELD_SUPPORT = new FieldSupport();17  private static final FieldSupport PROPERTY_OR_FIELD_SUPPORT = new PropertyOrFieldSupport();18  private static final TypeSupport TYPE_SUPPORT = new TypeSupport();19  private static final FieldUtils INSTANCE = new FieldUtils();20  public static FieldUtils instance() {21    return INSTANCE;22  }23  public static FieldSupport fieldSupport() {24    return FIELD_SUPPORT;25  }26  public static FieldSupport propertySupport() {27    return PROPERTY_SUPPORT;28  }29  public static FieldSupport propertyOrFieldSupport() {30    return PROPERTY_OR_FIELD_SUPPORT;31  }32  public static TypeSupport typeSupport() {33    return TYPE_SUPPORT;34  }35  private FieldUtils() {36  }37  public static FieldSupport getFieldSupport(Class<?> clazz) {38    FieldSupport fieldSupport = FIELD_SUPPORT_CACHE.get(clazz);39    if (fieldSupport != null) {40      return fieldSupport;41    }42    fieldSupport = new PropertyOrFieldSupport();43    FIELD_SUPPORT_CACHE.put(clazz, fieldSupport);44    return fieldSupport;45  }46  public static Object readField(Object target, String field, boolean forceAccess) {47    if (target == null) {48      throw new IntrospectionError("target object should not be null");49    }50    if (field == null) {51      throw new IntrospectionError("field name should not be null");52    }53    FieldSupport fieldSupport = getFieldSupport(target.getClass());54    return fieldSupport.read(target, field, forceAccess);55  }56  public static Object readField(Object target, String field) {57    return readField(target, field, true);58  }59  public static void writeField(Object target, String field, Object value, boolean forceAccess) {60    if (

readField

Using AI Code Generation

1import org.assertj.core.util.introspection.FieldUtils;2import java.lang.reflect.Field;3import java.lang.reflect.InvocationTargetException;4public class Test {5    public static void main(String[] args) {6        Field field = FieldUtils.readField(Test.class, "field", true);7        System.out.println(field);8    }9}

readField

Using AI Code Generation

1import org.assertj.core.util.introspection.FieldUtils;2public class 1 {3    public static void main(String[] args) {4        FieldUtils.readField(new Object(), "name", true);5    }6}7import org.assertj.core.util.introspection.FieldUtils;8public class 2 {9    public static void main(String[] args) {10        FieldUtils.readField(new Object(), "name", true);11    }12}13import org.assertj.core.util.introspection.FieldUtils;14public class 3 {15    public static void main(String[] args) {16        FieldUtils.readField(new Object(), "name", true);17    }18}19import org.assertj.core.util.introspection.FieldUtils;20public class 4 {21    public static void main(String[] args) {22        FieldUtils.readField(new Object(), "name", true);23    }24}25import org.assertj.core.util.introspection.FieldUtils;26public class 5 {27    public static void main(String[] args) {28        FieldUtils.readField(new Object(), "name", true);29    }30}31import org.assertj.core.util.introspection.FieldUtils;32public class 6 {33    public static void main(String[] args) {34        FieldUtils.readField(new Object(), "name", true);35    }36}37import org.assertj.core.util.introspection.FieldUtils;38public class 7 {39    public static void main(String[] args) {40        FieldUtils.readField(new Object(), "name", true);41    }42}43import org.assertj.core.util.introspection.FieldUtils;44public class 8 {45    public static void main(String

readField

Using AI Code Generation

1import org.assertj.core.util.introspection.FieldUtils;2import java.lang.reflect.Field;3public class ReadField {4   public static void main(String[] args) {5      try {6         Field field = FieldUtils.readField("field1", "class1");7         System.out.println("Field name: " + field.getName());8      } catch (Exception e) {9         e.printStackTrace();10      }11   }12}

readField

Using AI Code Generation

1import org.assertj.core.util.introspection.FieldUtils;2public class 1 {3    public static void main(String[] args) {4        TestClass test = new TestClass();5        TestClass test2 = new TestClass();6        test.a = 1;7        test2.a = 2;8        System.out.println("Value of variable a: "+FieldUtils.readField(test, "a", true));9        System.out.println("Value of variable a: "+FieldUtils.readField(test2, "a", true));10    }11}12class TestClass {13    public int a;14}

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