namematchmethodpointcut.java

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/*
 * Copyright 2002-2006 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;

import org.springframework.util.ObjectUtils;
import org.springframework.util.PatternMatchUtils;

/**
 * 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
 * @author Rob Harrop
 * @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 <code>setMappedNames</code>, 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.
	 * <p>The default implementation checks for "xxx*", "*xxx" and "*xxx*" matches,
	 * as well as direct equality. 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
	 * @see org.springframework.util.PatternMatchUtils#simpleMatch(String, String)
	 */
	protected boolean isMatch(String methodName, String mappedName) {
		return PatternMatchUtils.simpleMatch(mappedName, methodName);
	}


	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}
		return (other instanceof NameMatchMethodPointcut &&
				ObjectUtils.nullSafeEquals(this.mappedNames, ((NameMatchMethodPointcut) other).mappedNames));
	}

	public int hashCode() {
		return (this.mappedNames != null ? this.mappedNames.hashCode() : 0);
	}

}