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Provides a simple model for integrating Ehcache in a Spring project via annotations.

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/**
 * Copyright 2010 Nicholas Blair, Eric Dalquist
 *
 * 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 com.googlecode.ehcache.annotations.key;

import java.io.Serializable;


/**
 * {@link AbstractCacheKeyGenerator} implementation designed for subclassing.
 * 
 * Subclasses can implement the {@link #getAdditionalDataForKeyGeneration()} method to
 * seed additional data into the call to {@link #generateKey(Object...)}.
 * 
 * @author Nicholas Blair
 * @version $Id: DelegateCacheKeyGenerator.java 213 2010-04-06 16:31:42Z [email protected] $
 */
public abstract class DelegateCacheKeyGenerator extends AbstractCacheKeyGenerator {

	private final AbstractCacheKeyGenerator delegate;
	
	/**
	 * @param delegate
	 */
	public DelegateCacheKeyGenerator(
			AbstractCacheKeyGenerator delegate) {
		super();
		this.delegate = delegate;
	}

	/**
	 * Calls {@link #generateKey(Object...)} on the delegate passing in data argument AND the result
	 * from {@link #getAdditionalDataForKeyGeneration()}.
	 * 
	 * @see #getAdditionalDataForKeyGeneration()
	 * @see com.googlecode.ehcache.annotations.key.AbstractCacheKeyGenerator#generateKey(java.lang.Object[])
	 */
	@Override
	public final Serializable generateKey(Object... data) {
		this.setCheckforCycles(delegate.isCheckforCycles());
		return this.delegate.generateKey(getAdditionalDataForKeyGeneration(), data);
	}

	/**
	 * 
	 * @return a {@link Serializable} object to inject into the calls to {@link #generateKey(Object...)}
	 */
	public abstract Serializable getAdditionalDataForKeyGeneration();
}