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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.jboss.marshalling;
import static java.lang.System.getSecurityManager;
import static java.security.AccessController.doPrivileged;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.security.PrivilegedAction;
import org.jboss.marshalling._private.GetUnsafeAction;
import sun.misc.Unsafe;
/**
* A setter for a (possibly final) field, which allows for correct object initialization of {@link java.io.Serializable} objects
* with {@code readObject()} methods, even in the presence of {@code final} fields.
*/
public final class FieldSetter {
static final Unsafe unsafe = getSecurityManager() == null ? GetUnsafeAction.INSTANCE.run() : doPrivileged(GetUnsafeAction.INSTANCE);
private final Class clazz;
private final Class fieldType;
private final long fieldOffset;
private FieldSetter(final Field field) {
this.clazz = field.getDeclaringClass();
this.fieldType = field.getType();
fieldOffset = unsafe.objectFieldOffset(field);
}
/**
* Set the value of the field to the given object.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void set(Object instance, Object value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (! fieldType.isInstance(value)) {
throw incorrectValueType();
}
unsafe.putObject(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setBoolean(Object instance, boolean value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != boolean.class) {
throw incorrectValueType();
}
unsafe.putBoolean(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setByte(Object instance, byte value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != byte.class) {
throw incorrectValueType();
}
unsafe.putByte(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setChar(Object instance, char value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != char.class) {
throw incorrectValueType();
}
unsafe.putChar(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setDouble(Object instance, double value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != double.class) {
throw incorrectValueType();
}
unsafe.putDouble(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setFloat(Object instance, float value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != float.class) {
throw incorrectValueType();
}
unsafe.putFloat(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setInt(Object instance, int value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != int.class) {
throw incorrectValueType();
}
unsafe.putInt(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setLong(Object instance, long value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != long.class) {
throw incorrectValueType();
}
unsafe.putLong(instance, fieldOffset, value);
}
/**
* Set the value of the field to the given value.
*
* @param instance the instance to set
* @param value the new value
* @throws IllegalArgumentException if the given instance is {@code null} or not of the correct class
*/
public void setShort(Object instance, short value) throws IllegalArgumentException {
if (! clazz.isInstance(instance)) {
throw incorrectType();
}
if (fieldType != short.class) {
throw incorrectValueType();
}
unsafe.putShort(instance, fieldOffset, value);
}
private static IllegalArgumentException incorrectType() {
return new IllegalArgumentException("Instance is not of the correct type");
}
private static IllegalArgumentException incorrectValueType() {
return new IllegalArgumentException("Value is not of the correct type");
}
private static final StackWalker SW = doPrivileged((PrivilegedAction) () -> StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE));
/**
* Get an instance for the current class.
*
* @param clazz the class containing the field
* @param name the name of the field
* @return the {@code Field} instance
* @throws SecurityException if the field does not belong to the caller's class, or the field is static
* @throws IllegalArgumentException if there is no field of the given name on the given class
*/
public static FieldSetter get(final Class clazz, final String name) throws SecurityException, IllegalArgumentException {
final Class caller = SW.getCallerClass();
if (caller != clazz) {
throw new SecurityException("Cannot get field from someone else's class");
}
final Field field;
try {
field = clazz.getDeclaredField(name);
} catch (NoSuchFieldException e) {
throw new IllegalArgumentException("No such field '" + name + "'", e);
}
final int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers)) {
throw new SecurityException("Cannot get access to static field '" + name + "'");
}
return new FieldSetter(field);
}
}
