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/*
 * Copyright 2002-2014 the original author or authors.
 *
 * 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.springframework.cache.interceptor;

import java.lang.reflect.Method;

/**
 * Simple key generator. Returns the parameter itself if a single non-null value
 * is given, otherwise returns a {@link SimpleKey} of the parameters.
 *
 * 

Unlike {@link DefaultKeyGenerator}, no collisions will occur with the keys * generated by this class. The returned {@link SimpleKey} object can be safely * used with a {@link org.springframework.cache.concurrent.ConcurrentMapCache}, * however, might not be suitable for all {@link org.springframework.cache.Cache} * implementations. * * @author Phillip Webb * @author Juergen Hoeller * @since 4.0 * @see SimpleKey * @see DefaultKeyGenerator * @see org.springframework.cache.annotation.CachingConfigurer */ public class SimpleKeyGenerator implements KeyGenerator { @Override public Object generate(Object target, Method method, Object... params) { return generateKey(params); } /** * Generate a key based on the specified parameters. */ public static Object generateKey(Object... params) { if (params.length == 0) { return SimpleKey.EMPTY; } if (params.length == 1) { Object param = params[0]; if (param != null && !param.getClass().isArray()) { return param; } } return new SimpleKey(params); } }





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