org.apache.commons.lang3.reflect.FieldUtils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of commons-lang3 Show documentation
Show all versions of commons-lang3 Show documentation
Apache Commons Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so
standard as to justify existence in java.lang.
The code is tested using the latest revision of the JDK for supported
LTS releases: 8, 11, 17 and 21 currently.
See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml
Please ensure your build environment is up-to-date and kindly report any build issues.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3.reflect;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.ClassUtils;
import org.apache.commons.lang3.JavaVersion;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.SystemUtils;
import org.apache.commons.lang3.Validate;
/**
* Utilities for working with {@link Field}s by reflection. Adapted and refactored from the dormant [reflect] Commons
* sandbox component.
*
* The ability is provided to break the scoping restrictions coded by the programmer. This can allow fields to be
* changed that shouldn't be. This facility should be used with care.
*
* @since 2.5
*/
public class FieldUtils {
/**
* Gets all fields of the given class and its parents (if any).
*
* @param cls
* the {@link Class} to query
* @return an array of Fields (possibly empty).
* @throws NullPointerException
* if the class is {@code null}
* @since 3.2
*/
public static Field[] getAllFields(final Class cls) {
return getAllFieldsList(cls).toArray(ArrayUtils.EMPTY_FIELD_ARRAY);
}
/**
* Gets all fields of the given class and its parents (if any).
*
* @param cls
* the {@link Class} to query
* @return a list of Fields (possibly empty).
* @throws NullPointerException
* if the class is {@code null}
* @since 3.2
*/
public static List getAllFieldsList(final Class cls) {
Objects.requireNonNull(cls, "cls");
final List allFields = new ArrayList<>();
Class currentClass = cls;
while (currentClass != null) {
final Field[] declaredFields = currentClass.getDeclaredFields();
Collections.addAll(allFields, declaredFields);
currentClass = currentClass.getSuperclass();
}
return allFields;
}
/**
* Gets an accessible {@link Field} by name respecting scope. Only the specified class will be considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @return the Field object
* @throws NullPointerException
* if the class is {@code null}
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, or empty
*/
public static Field getDeclaredField(final Class cls, final String fieldName) {
return getDeclaredField(cls, fieldName, false);
}
/**
* Gets an accessible {@link Field} by name, breaking scope if requested. Only the specified class will be
* considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @return the Field object
* @throws NullPointerException
* if the class is {@code null}
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, or empty
*/
public static Field getDeclaredField(final Class cls, final String fieldName, final boolean forceAccess) {
Objects.requireNonNull(cls, "cls");
Validate.isTrue(StringUtils.isNotBlank(fieldName), "The field name must not be blank/empty");
try {
// only consider the specified class by using getDeclaredField()
final Field field = cls.getDeclaredField(fieldName);
if (!MemberUtils.isAccessible(field)) {
if (!forceAccess) {
return null;
}
field.setAccessible(true);
}
return field;
} catch (final NoSuchFieldException ignored) {
// ignore
}
return null;
}
/**
* Gets an accessible {@link Field} by name respecting scope. Superclasses/interfaces will be considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @return the Field object
* @throws NullPointerException
* if the class is {@code null}
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, or empty
*/
public static Field getField(final Class cls, final String fieldName) {
return MemberUtils.setAccessibleWorkaround(getField(cls, fieldName, false));
}
/**
* Gets an accessible {@link Field} by name, breaking scope if requested. Superclasses/interfaces will be
* considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @return the Field object
* @throws NullPointerException if the class is {@code null}
* @throws IllegalArgumentException if the field name is blank or empty or is matched at multiple places
* in the inheritance hierarchy
*/
public static Field getField(final Class cls, final String fieldName, final boolean forceAccess) {
Objects.requireNonNull(cls, "cls");
Validate.isTrue(StringUtils.isNotBlank(fieldName), "The field name must not be blank/empty");
// FIXME is this workaround still needed? lang requires Java 6
// Sun Java 1.3 has a bugged implementation of getField hence we write the
// code ourselves
// getField() will return the Field object with the declaring class
// set correctly to the class that declares the field. Thus requesting the
// field on a subclass will return the field from the superclass.
//
// priority order for lookup:
// searchclass private/protected/package/public
// superclass protected/package/public
// private/different package blocks access to further superclasses
// implementedinterface public
// check up the superclass hierarchy
for (Class acls = cls; acls != null; acls = acls.getSuperclass()) {
try {
final Field field = acls.getDeclaredField(fieldName);
// getDeclaredField checks for non-public scopes as well
// and it returns accurate results
if (!MemberUtils.isPublic(field)) {
if (!forceAccess) {
continue;
}
field.setAccessible(true);
}
return field;
} catch (final NoSuchFieldException ignored) {
// ignore
}
}
// check the public interface case. This must be manually searched for
// incase there is a public supersuperclass field hidden by a private/package
// superclass field.
Field match = null;
for (final Class class1 : ClassUtils.getAllInterfaces(cls)) {
try {
final Field test = class1.getField(fieldName);
Validate.isTrue(match == null, "Reference to field %s is ambiguous relative to %s"
+ "; a matching field exists on two or more implemented interfaces.", fieldName, cls);
match = test;
} catch (final NoSuchFieldException ignored) {
// ignore
}
}
return match;
}
/**
* Gets all fields of the given class and its parents (if any) that are annotated with the given annotation.
* @param cls
* the {@link Class} to query
* @param annotationCls
* the {@link Annotation} that must be present on a field to be matched
* @return a list of Fields (possibly empty).
* @throws NullPointerException
* if the class or annotation are {@code null}
* @since 3.4
*/
public static List getFieldsListWithAnnotation(final Class cls, final Class annotationCls) {
Objects.requireNonNull(annotationCls, "annotationCls");
return getAllFieldsList(cls).stream().filter(field -> field.getAnnotation(annotationCls) != null).collect(Collectors.toList());
}
/**
* Gets all fields of the given class and its parents (if any) that are annotated with the given annotation.
* @param cls
* the {@link Class} to query
* @param annotationCls
* the {@link Annotation} that must be present on a field to be matched
* @return an array of Fields (possibly empty).
* @throws NullPointerException
* if the class or annotation are {@code null}
* @since 3.4
*/
public static Field[] getFieldsWithAnnotation(final Class cls, final Class annotationCls) {
return getFieldsListWithAnnotation(cls, annotationCls).toArray(ArrayUtils.EMPTY_FIELD_ARRAY);
}
/**
* Reads the named {@code public} {@link Field}. Only the class of the specified object will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @return the value of the field
* @throws NullPointerException
* if {@code target} is {@code null}
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank or empty, or could not be found
* @throws IllegalAccessException
* if the named field is not {@code public}
*/
public static Object readDeclaredField(final Object target, final String fieldName) throws IllegalAccessException {
return readDeclaredField(target, fieldName, false);
}
/**
* Gets a {@link Field} value by name. Only the class of the specified object will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match public fields.
* @return the Field object
* @throws NullPointerException
* if {@code target} is {@code null}
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank or empty, or could not be found
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static Object readDeclaredField(final Object target, final String fieldName, final boolean forceAccess) throws IllegalAccessException {
Objects.requireNonNull(target, "target");
final Class cls = target.getClass();
final Field field = getDeclaredField(cls, fieldName, forceAccess);
Validate.isTrue(field != null, "Cannot locate declared field %s.%s", cls, fieldName);
// already forced access above, don't repeat it here:
return readField(field, target, false);
}
/**
* Gets the value of a {@code static} {@link Field} by name. The field must be {@code public}. Only the specified
* class will be considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @return the value of the field
* @throws NullPointerException
* if the class is {@code null}, or the field could not be found
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, empty, or is not {@code static}
* @throws IllegalAccessException
* if the field is not accessible
*/
public static Object readDeclaredStaticField(final Class cls, final String fieldName) throws IllegalAccessException {
return readDeclaredStaticField(cls, fieldName, false);
}
/**
* Gets the value of a {@code static} {@link Field} by name. Only the specified class will be considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @return the Field object
* @throws NullPointerException
* if the class is {@code null}, or the field could not be found
* @throws IllegalArgumentException
* if the field name is blank or empty, is not {@code static}
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static Object readDeclaredStaticField(final Class cls, final String fieldName, final boolean forceAccess) throws IllegalAccessException {
final Field field = getDeclaredField(cls, fieldName, forceAccess);
Validate.notNull(field, "Cannot locate declared field %s.%s", cls.getName(), fieldName);
// already forced access above, don't repeat it here:
return readStaticField(field, false);
}
/**
* Reads an accessible {@link Field}.
*
* @param field
* the field to use
* @param target
* the object to call on, may be {@code null} for {@code static} fields
* @return the field value
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalAccessException
* if the field is not accessible
*/
public static Object readField(final Field field, final Object target) throws IllegalAccessException {
return readField(field, target, false);
}
/**
* Reads a {@link Field}.
*
* @param field
* the field to use
* @param target
* the object to call on, may be {@code null} for {@code static} fields
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method.
* @return the field value
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static Object readField(final Field field, final Object target, final boolean forceAccess) throws IllegalAccessException {
Objects.requireNonNull(field, "field");
if (forceAccess && !field.isAccessible()) {
field.setAccessible(true);
} else {
MemberUtils.setAccessibleWorkaround(field);
}
return field.get(target);
}
/**
* Reads the named {@code public} {@link Field}. Superclasses will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @return the value of the field
* @throws NullPointerException
* if the target is {@code null}
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, empty, or could not be found
* @throws IllegalAccessException
* if the named field is not {@code public}
*/
public static Object readField(final Object target, final String fieldName) throws IllegalAccessException {
return readField(target, fieldName, false);
}
/**
* Reads the named {@link Field}. Superclasses will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @return the field value
* @throws NullPointerException
* if {@code target} is {@code null}
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, empty, or could not be found
* @throws IllegalAccessException
* if the named field is not made accessible
*/
public static Object readField(final Object target, final String fieldName, final boolean forceAccess) throws IllegalAccessException {
Objects.requireNonNull(target, "target");
final Class cls = target.getClass();
final Field field = getField(cls, fieldName, forceAccess);
Validate.isTrue(field != null, "Cannot locate field %s on %s", fieldName, cls);
// already forced access above, don't repeat it here:
return readField(field, target, false);
}
/**
* Reads the named {@code public static} {@link Field}. Superclasses will be considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @return the value of the field
* @throws NullPointerException
* if the class is {@code null}, or the field could not be found
* @throws IllegalArgumentException
* if the field name is {@code null}, blank or empty, or is not {@code static}
* @throws IllegalAccessException
* if the field is not accessible
*/
public static Object readStaticField(final Class cls, final String fieldName) throws IllegalAccessException {
return readStaticField(cls, fieldName, false);
}
/**
* Reads the named {@code static} {@link Field}. Superclasses will be considered.
*
* @param cls
* the {@link Class} to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @return the Field object
* @throws NullPointerException
* if the class is {@code null}, or the field could not be found
* @throws IllegalArgumentException
* if the field name is {@code null}, blank or empty, or is not {@code static}
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static Object readStaticField(final Class cls, final String fieldName, final boolean forceAccess) throws IllegalAccessException {
final Field field = getField(cls, fieldName, forceAccess);
Validate.notNull(field, "Cannot locate field '%s' on %s", fieldName, cls);
// already forced access above, don't repeat it here:
return readStaticField(field, false);
}
/**
* Reads an accessible {@code static} {@link Field}.
*
* @param field
* to read
* @return the field value
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalArgumentException
* if the field is not {@code static}
* @throws IllegalAccessException
* if the field is not accessible
*/
public static Object readStaticField(final Field field) throws IllegalAccessException {
return readStaticField(field, false);
}
/**
* Reads a static {@link Field}.
*
* @param field
* to read
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method.
* @return the field value
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalArgumentException
* if the field is not {@code static}
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static Object readStaticField(final Field field, final boolean forceAccess) throws IllegalAccessException {
Objects.requireNonNull(field, "field");
Validate.isTrue(MemberUtils.isStatic(field), "The field '%s' is not static", field.getName());
return readField(field, (Object) null, forceAccess);
}
/**
* Removes the final modifier from a {@link Field}.
*
* @param field
* to remove the final modifier
* @throws NullPointerException
* if the field is {@code null}
* @since 3.2
*/
public static void removeFinalModifier(final Field field) {
removeFinalModifier(field, true);
}
/**
* Removes the final modifier from a {@link Field}.
*
* @param field
* to remove the final modifier
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @throws NullPointerException
* if the field is {@code null}
* @deprecated As of Java 12, we can no longer drop the {@code final} modifier, thus
* rendering this method obsolete. The JDK discussion about this change can be found
* here: https://mail.openjdk.java.net/pipermail/core-libs-dev/2018-November/056486.html
* @since 3.3
*/
@Deprecated
public static void removeFinalModifier(final Field field, final boolean forceAccess) {
Objects.requireNonNull(field, "field");
try {
if (Modifier.isFinal(field.getModifiers())) {
// Do all JREs implement Field with a private ivar called "modifiers"?
final Field modifiersField = Field.class.getDeclaredField("modifiers");
final boolean doForceAccess = forceAccess && !modifiersField.isAccessible();
if (doForceAccess) {
modifiersField.setAccessible(true);
}
try {
modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
} finally {
if (doForceAccess) {
modifiersField.setAccessible(false);
}
}
}
} catch (final NoSuchFieldException | IllegalAccessException e) {
if (SystemUtils.isJavaVersionAtLeast(JavaVersion.JAVA_12)) {
throw new UnsupportedOperationException(
"In java 12+ final cannot be removed.",
e
);
}
// else no exception is thrown because we can modify final.
}
}
/**
* Writes a {@code public} {@link Field}. Only the specified class will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param value
* to set
* @throws NullPointerException
* if {@code target} is {@code null}
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank or empty, or could not be found,
* or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static void writeDeclaredField(final Object target, final String fieldName, final Object value) throws IllegalAccessException {
writeDeclaredField(target, fieldName, value, false);
}
/**
* Writes a {@code public} {@link Field}. Only the specified class will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param value
* to set
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank or empty, or could not be found,
* or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static void writeDeclaredField(final Object target, final String fieldName, final Object value, final boolean forceAccess)
throws IllegalAccessException {
Objects.requireNonNull(target, "target");
final Class cls = target.getClass();
final Field field = getDeclaredField(cls, fieldName, forceAccess);
Validate.isTrue(field != null, "Cannot locate declared field %s.%s", cls.getName(), fieldName);
// already forced access above, don't repeat it here:
writeField(field, target, value, false);
}
/**
* Writes a named {@code public static} {@link Field}. Only the specified class will be considered.
*
* @param cls
* {@link Class} on which the field is to be found
* @param fieldName
* to write
* @param value
* to set
* @throws NullPointerException
* if {@code cls} is {@code null} or the field cannot be located
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, empty, not {@code static}, or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not {@code public} or is {@code final}
*/
public static void writeDeclaredStaticField(final Class cls, final String fieldName, final Object value) throws IllegalAccessException {
writeDeclaredStaticField(cls, fieldName, value, false);
}
/**
* Writes a named {@code static} {@link Field}. Only the specified class will be considered.
*
* @param cls
* {@link Class} on which the field is to be found
* @param fieldName
* to write
* @param value
* to set
* @param forceAccess
* whether to break scope restrictions using the {@code AccessibleObject#setAccessible(boolean)} method.
* {@code false} will only match {@code public} fields.
* @throws NullPointerException
* if {@code cls} is {@code null} or the field cannot be located
* @throws IllegalArgumentException
* if the field name is {@code null}, blank, empty, not {@code static}, or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not made accessible or is {@code final}
*/
public static void writeDeclaredStaticField(final Class cls, final String fieldName, final Object value, final boolean forceAccess)
throws IllegalAccessException {
final Field field = getDeclaredField(cls, fieldName, forceAccess);
Validate.notNull(field, "Cannot locate declared field %s.%s", cls.getName(), fieldName);
// already forced access above, don't repeat it here:
writeField(field, (Object) null, value, false);
}
/**
* Writes an accessible {@link Field}.
*
* @param field
* to write
* @param target
* the object to call on, may be {@code null} for {@code static} fields
* @param value
* to set
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalArgumentException
* if {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not accessible or is {@code final}
*/
public static void writeField(final Field field, final Object target, final Object value) throws IllegalAccessException {
writeField(field, target, value, false);
}
/**
* Writes a {@link Field}.
*
* @param field
* to write
* @param target
* the object to call on, may be {@code null} for {@code static} fields
* @param value
* to set
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalArgumentException
* if {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not made accessible or is {@code final}
*/
public static void writeField(final Field field, final Object target, final Object value, final boolean forceAccess)
throws IllegalAccessException {
Objects.requireNonNull(field, "field");
if (forceAccess && !field.isAccessible()) {
field.setAccessible(true);
} else {
MemberUtils.setAccessibleWorkaround(field);
}
field.set(target, value);
}
/**
* Writes a {@code public} {@link Field}. Superclasses will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param value
* to set
* @throws NullPointerException
* if {@code target} is {@code null}
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank, empty, or could not be found,
* or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not accessible
*/
public static void writeField(final Object target, final String fieldName, final Object value) throws IllegalAccessException {
writeField(target, fieldName, value, false);
}
/**
* Writes a {@link Field}. Superclasses will be considered.
*
* @param target
* the object to reflect, must not be {@code null}
* @param fieldName
* the field name to obtain
* @param value
* to set
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @throws NullPointerException
* if {@code target} is {@code null}
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank, empty, or could not be found,
* or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not made accessible
*/
public static void writeField(final Object target, final String fieldName, final Object value, final boolean forceAccess)
throws IllegalAccessException {
Objects.requireNonNull(target, "target");
final Class cls = target.getClass();
final Field field = getField(cls, fieldName, forceAccess);
Validate.isTrue(field != null, "Cannot locate declared field %s.%s", cls.getName(), fieldName);
// already forced access above, don't repeat it here:
writeField(field, target, value, false);
}
/**
* Writes a named {@code public static} {@link Field}. Superclasses will be considered.
*
* @param cls
* {@link Class} on which the field is to be found
* @param fieldName
* to write
* @param value
* to set
* @throws NullPointerException
* if {@code target} is {@code null}
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank or empty, the field cannot be located or is
* not {@code static}, or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not {@code public} or is {@code final}
*/
public static void writeStaticField(final Class cls, final String fieldName, final Object value) throws IllegalAccessException {
writeStaticField(cls, fieldName, value, false);
}
/**
* Writes a named {@code static} {@link Field}. Superclasses will be considered.
*
* @param cls
* {@link Class} on which the field is to be found
* @param fieldName
* to write
* @param value
* to set
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @throws NullPointerException
* if {@code cls} is {@code null} or the field cannot be located
* @throws IllegalArgumentException
* if {@code fieldName} is {@code null}, blank or empty, the field not {@code static}, or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not made accessible or is {@code final}
*/
public static void writeStaticField(final Class cls, final String fieldName, final Object value, final boolean forceAccess)
throws IllegalAccessException {
final Field field = getField(cls, fieldName, forceAccess);
Validate.notNull(field, "Cannot locate field %s on %s", fieldName, cls);
// already forced access above, don't repeat it here:
writeStaticField(field, value, false);
}
/**
* Writes a {@code public static} {@link Field}.
*
* @param field
* to write
* @param value
* to set
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalArgumentException
* if the field is not {@code static}, or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not {@code public} or is {@code final}
*/
public static void writeStaticField(final Field field, final Object value) throws IllegalAccessException {
writeStaticField(field, value, false);
}
/**
* Writes a static {@link Field}.
*
* @param field
* to write
* @param value
* to set
* @param forceAccess
* whether to break scope restrictions using the
* {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} method. {@code false} will only
* match {@code public} fields.
* @throws NullPointerException
* if the field is {@code null}
* @throws IllegalArgumentException
* if the field is not {@code static}, or {@code value} is not assignable
* @throws IllegalAccessException
* if the field is not made accessible or is {@code final}
*/
public static void writeStaticField(final Field field, final Object value, final boolean forceAccess) throws IllegalAccessException {
Objects.requireNonNull(field, "field");
Validate.isTrue(MemberUtils.isStatic(field), "The field %s.%s is not static", field.getDeclaringClass().getName(),
field.getName());
writeField(field, (Object) null, value, forceAccess);
}
/**
* {@link FieldUtils} instances should NOT be constructed in standard programming.
*
* This constructor is {@code public} to permit tools that require a JavaBean instance to operate.
*
*/
public FieldUtils() {
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy