namematchmethodpointcut.java

一个关于Spring框架的示例应用程序,简单使用,可以参考.

/*
 * Copyright 2002-2004 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.aop.support;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.LinkedList;
import java.util.List;

/**
 * Pointcut bean for simple method name matches, as alternative to regexp patterns.
 * Does not handle overloaded methods: all methods *with a given name will be eligible.
 * @author Juergen Hoeller
 * @author Rod Johnson
 * @since 11.02.2004
 * @see #isMatch
 */
public class NameMatchMethodPointcut extends StaticMethodMatcherPointcut implements Serializable {

	private List mappedNames = new LinkedList();

	/**
	 * Convenience method when we have only a single method name
	 * to match. Use either this method or setMappedNames(), not both.
	 * @see #setMappedNames
	 */
	public void setMappedName(String mappedName) {
		setMappedNames(new String[] { mappedName });
	}

	/**
	 * Set the method names defining methods to match.
	 * Matching will be the union of all these; if any match,
	 * the pointcut matches.
	 */
	public void setMappedNames(String[] mappedNames) {
		this.mappedNames = new LinkedList();
		if (mappedNames != null) {
			for (int i = 0; i < mappedNames.length; i++) {
				this.mappedNames.add(mappedNames[i]);
			}
		}
	}
	
	/**
	 * Add another eligible method name, in addition to those already named.
	 * Like the set methods, this method is for use when configuring proxies,
	 * before a proxy is used.
	 * <p><b>NB:</b> This method does not work after the proxy is in
	 * use, as advice chains will be cached.
	 * @param name name of the additional method that will match
	 * @return this pointcut to allow for multiple additions in one line
	 */
	public NameMatchMethodPointcut addMethodName(String name) {
		// TODO in a future release, consider a way of letting proxies
		// cause advice changed events.
		this.mappedNames.add(name);
		return this;
	}
	
	public boolean matches(Method method, Class targetClass) {
		for (int i = 0; i < this.mappedNames.size(); i++) {
			String mappedName = (String) this.mappedNames.get(i);
			if (mappedName.equals(method.getName()) || isMatch(method.getName(), mappedName)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Return if the given method name matches the mapped name.
	 * The default implementation checks for "xxx*" and "*xxx" matches.
	 * Can be overridden in subclasses.
	 * @param methodName the method name of the class
	 * @param mappedName the name in the descriptor
	 * @return if the names match
	 */
	protected boolean isMatch(String methodName, String mappedName) {
		return (mappedName.endsWith("*") && methodName.startsWith(mappedName.substring(0, mappedName.length() - 1))) ||
				(mappedName.startsWith("*") && methodName.endsWith(mappedName.substring(1, mappedName.length())));
	}

}