/*
* Copyright 2002-2012 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 org.springframework.aop.MethodMatcher;
import org.springframework.aop.Pointcut;
import org.springframework.util.Assert;
/**
* Pointcut constants for matching getters and setters,
* and static methods useful for manipulating and evaluating pointcuts.
* These methods are particularly useful for composing pointcuts
* using the union and intersection methods.
*
* @author Rod Johnson
* @author Juergen Hoeller
*/
public abstract class Pointcuts {
/** Pointcut matching all bean property setters, in any class */
public static final Pointcut SETTERS = SetterPointcut.INSTANCE;
/** Pointcut matching all bean property getters, in any class */
public static final Pointcut GETTERS = GetterPointcut.INSTANCE;
/**
* Match all methods that <b>either</b> (or both) of the given pointcuts matches.
* @param pc1 the first Pointcut
* @param pc2 the second Pointcut
* @return a distinct Pointcut that matches all methods that either
* of the given Pointcuts matches
*/
public static Pointcut union(Pointcut pc1, Pointcut pc2) {
return new ComposablePointcut(pc1).union(pc2);
}
/**
* Match all methods that <b>both</b> the given pointcuts match.
* @param pc1 the first Pointcut
* @param pc2 the second Pointcut
* @return a distinct Pointcut that matches all methods that both
* of the given Pointcuts match
*/
public static Pointcut intersection(Pointcut pc1, Pointcut pc2) {
return new ComposablePointcut(pc1).intersection(pc2);
}
/**
* Perform the least expensive check for a pointcut match.
* @param pointcut the pointcut to match
* @param method the candidate method
* @param targetClass the target class
* @param args arguments to the method
* @return whether there's a runtime match
*/
public static boolean matches(Pointcut pointcut, Method method, Class<?> targetClass, Object[] args) {
Assert.notNull(pointcut, "Pointcut must not be null");
if (pointcut == Pointcut.TRUE) {
return true;
}
if (pointcut.getClassFilter().matches(targetClass)) {
// Only check if it gets past first hurdle.
MethodMatcher mm = pointcut.getMethodMatcher();
if (mm.matches(method, targetClass)) {
// We may need additional runtime (argument) check.
return (!mm.isRuntime() || mm.matches(method, targetClass, args));
}
}
return false;
}
/**
* Pointcut implementation that matches bean property setters.
*/
@SuppressWarnings("serial")
private static class SetterPointcut extends StaticMethodMatcherPointcut implements Serializable {
public static SetterPointcut INSTANCE = new SetterPointcut();
@Override
public boolean matches(Method method, Class<?> targetClass) {
return method.getName().startsWith("set") &&
method.getParameterTypes().length == 1 &&
method.getReturnType() == Void.TYPE;
}
private Object readResolve() {
return INSTANCE;
}
}
/**
* Pointcut implementation that matches bean property getters.
*/
@SuppressWarnings("serial")
private static class GetterPointcut extends StaticMethodMatcherPointcut implements Serializable {
public static GetterPointcut INSTANCE = new GetterPointcut();
@Override
public boolean matches(Method method, Class<?> targetClass) {
return method.getName().startsWith("get") &&
method.getParameterTypes().length == 0;
}
private Object readResolve() {
return INSTANCE;
}
}
}
