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  * Copyright SpringSource Inc 2009.
  * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package com.springsource.util.common;

SynchronizedObject wraps a given java.lang.Object and protects access to the object by synchronizing on a given monitor.

Note that hashCode and equals are not delegated as this object is distinct from the wrapped object. Concurrent Semantics
This class is thread safe.

Glyn Normington
public class SynchronizedObject extends Object {
    private final Object monitor;
    private final Object object;
    public SynchronizedObject(Object objectObject monitor) {
        if (object == null) {
            throw new IllegalArgumentException("null object");
        if (monitor == null) {
            throw new IllegalArgumentException("null monitor");
        this. = object;
        this. = monitor;

    public String toString() {
        synchronized (this.) {
            return this..toString();
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