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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ---------------------------------------------------------------------
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.common;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.GuardedBy;

/**
 * User: serso
 * Date: 7/9/12
 * Time: 4:02 PM
 */
public abstract class SynchronizedObject {

	@GuardedBy("mutex")
	@Nonnull
	protected final D delegate;

	@Nonnull
	protected final Object mutex;

	protected SynchronizedObject(@Nonnull D delegate) {
		this.delegate = delegate;
		this.mutex = this;
	}

	protected SynchronizedObject(@Nonnull D delegate, @Nonnull Object mutex) {
		this.delegate = delegate;
		this.mutex = mutex;
	}

	// for manually synchronization it is allows to use mutex
	@Nonnull
	public Object getMutex() {
		return mutex;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (!(o instanceof SynchronizedObject)) {
			return false;
		}

		final SynchronizedObject that = (SynchronizedObject) o;

		synchronized (mutex) {
			if (!delegate.equals(that.delegate)) {
				return false;
			}
		}

		return true;
	}

	@Override
	public int hashCode() {
		synchronized (mutex) {
			return delegate.hashCode();
		}
	}

	@Override
	public String toString() {
		synchronized (mutex) {
			return delegate.toString();
		}
	}
}