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How to use nonStaticField method of com.tngtech.jgiven.impl.util.ReflectionUtil class

Best JGiven code snippet using com.tngtech.jgiven.impl.util.ReflectionUtil.nonStaticField

Source:ReflectionUtil.java

...76    }77    public static FieldPredicate allFields(){78        return field -> true;79    }80    public static FieldPredicate nonStaticField(){81        return field -> !Modifier.isStatic( field.getModifiers() );82    }83    public static boolean hasConstructor( Class<?> type, Class<?>... parameterTypes ){84        try {85            type.getDeclaredConstructor( parameterTypes );86            return true;87        } catch( NoSuchMethodException e ) {88            return false;89        }90    }91    public interface FieldPredicate {92        boolean isTrue( Field field ) throws Exception;93    }94    public interface ClassAction {95        void act( Class<?> clazz ) throws Exception;96    }97    public interface FieldAction {98        void act( Object object, Field field ) throws Exception;99    }100    public interface MethodAction {101        void act( Object object, Method method ) throws Exception;102    }103    public static Optional<Method> findMethodTransitively( Class<?> clazz, String methodName ){104        if( clazz == null ) {105            return Optional.empty();106        }107        try {108            return Optional.of( clazz.getDeclaredMethod( methodName ) );109        } catch( NoSuchMethodException e ) {110            return findMethodTransitively( clazz.getSuperclass(), methodName );111        }112    }113    public static <T> T newInstance( Class<T> type ){114        return newInstance( type, new Class<?>[0] );115    }116    public static <T> T newInstance( Class<T> type, Class<?>[] parameterTypes, Object... parameterValues ){117        try {118            Constructor<T> constructor = type.getDeclaredConstructor( parameterTypes );119            constructor.setAccessible( true );120            return constructor.newInstance( parameterValues );121        } catch( InstantiationException e ) {122            throw new RuntimeException( e );123        } catch( IllegalAccessException e ) {124            throw new RuntimeException( e );125        } catch( NoSuchMethodException e ) {126            throw new RuntimeException( e );127        } catch( InvocationTargetException e ) {128            throw new RuntimeException( e );129        }130    }131    public static void invokeMethod( Object object, Method method, String errorDescription ){132        log.debug( "Executing method %s of class %s", method, object.getClass() );133        makeAccessible( method, errorDescription );134        try {135            method.invoke( object );136        } catch( IllegalArgumentException e ) {137            log.debug( "Caught exception:", e );138            throw new JGivenExecutionException( "Could not execute " + toReadableString( method ) + errorDescription +139                    ", because it requires parameters. " + "Remove the parameters and try again.", e );140        } catch( IllegalAccessException e ) {141            log.debug( "Caught exception:", e );142            throw new JGivenExecutionException( "Could not execute " + toReadableString( method ) + errorDescription +143                    ", because of insuffient access rights. "144                    + "Either make the method public or disable your security manager while executing JGiven tests.", e );145        } catch( InvocationTargetException e ) {146            throw new JGivenUserException( method, errorDescription, e.getCause() );147        }148    }149    /**150     * Returns a {@link List} of objects reflecting all the non-static field values declared by the class or interface151     * represented by the given {@link Class} object and defined by the given {@link Object}. This includes152     * {@code public}, {@code protected}, default (package) access, and {@code private} fields, but excludes inherited153     * fields. The elements in the {@link List} returned are not sorted and are not in any particular order. This method154     * returns an empty {@link List} if the class or interface declares no fields, or if the given {@link Class} object155     * represents a primitive type, an array class, or void.156     *157     * @param clazz class or interface declaring fields158     * @param target instance of given {@code clazz} from which field values should be retrieved159     * @param errorDescription customizable part of logged error message160     * @return a {@link List} containing all the found field values (never {@code null})161     */162    public static List<Object> getAllNonStaticFieldValuesFrom( final Class<?> clazz, final Object target, final String errorDescription ){163        return getAllFieldValues( target, getAllNonStaticFields( clazz ), errorDescription );164    }165    private static Function<Field, Object> getFieldValueFunction( final Object target, final String errorDescription ){166        return field -> getFieldValueOrNull( field, target, errorDescription );167    }168    public static Object getFieldValueOrNull( String fieldName, Object target, String errorDescription ){169        try {170            Field field = target.getClass().getDeclaredField( fieldName );171            return getFieldValueOrNull( field, target, errorDescription );172        } catch( Exception e ) {173            log.warn(174                    format( "Not able to access field '%s'." + errorDescription, fieldName ), e );175            return null;176        }177    }178    public static Object getFieldValueOrNull( Field field, Object target, String errorDescription ){179        makeAccessible( field, "" );180        try {181            return field.get( target );182        } catch( IllegalAccessException e ) {183            log.warn(184                    format( "Not able to access field '%s'." + errorDescription, toReadableString( field ) ), e );185            return null;186        }187    }188    public static List<Field> getAllNonStaticFields( Class<?> clazz ){189        final List<Field> result = Lists.newArrayList();190        forEachField( null, clazz, nonStaticField(), new FieldAction() {191            @Override192            public void act( Object target, Field field ) throws Exception{193                result.add( field );194            }195        } );196        return result;197    }198    public static List<Object> getAllFieldValues( Object target, Iterable<Field> fields, String errorDescription ){199        return StreamSupport.stream( fields.spliterator(), false )200                .map( getFieldValueFunction( target, errorDescription ) )201                .collect( Collectors.toList() );202    }203    public static List<String> getAllFieldNames( Iterable<Field> fields ){204        return StreamSupport.stream( fields.spliterator(), false )...

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