/*
* Copyright 2002-2016 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.
*
* <p>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 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);
}
}