org.springframework.aop.support.Pointcuts Maven / Gradle / Ivy
/*
* Copyright 2002-2005 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;
/**
* 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
*/
public abstract class Pointcuts {
private static class SetterPointcut extends StaticMethodMatcherPointcut implements Serializable {
public static SetterPointcut INSTANCE = new SetterPointcut();
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;
}
}
private static class GetterPointcut extends StaticMethodMatcherPointcut implements Serializable {
public static GetterPointcut INSTANCE = new GetterPointcut();
public boolean matches(Method method, Class targetClass) {
return method.getName().startsWith("get") &&
method.getParameterTypes().length == 0;
}
private Object readResolve() {
return INSTANCE;
}
}
/**
* Pointcut matching all setters, in any class
*/
public static final Pointcut SETTERS = SetterPointcut.INSTANCE;
/**
* Pointcut matching all getters, in any class
*/
public static final Pointcut GETTERS = GetterPointcut.INSTANCE;
/**
* Match all methods that either (or both) of the given pointcuts matches
* @param a input pointcut
* @param b input pointput
* @return a distinct Pointcut that matches all methods that either of the
* given pointcuts matches
*/
public static Pointcut union(Pointcut a, Pointcut b) {
return new UnionPointcut(a, b);
}
/**
* Match all methods that both the given pointcuts match
* @param a input pointcut
* @param b input pointput
* @return a distinct Pointcut that matches all methods that both the
* given pointcuts match
*/
public static Pointcut intersection(Pointcut a, Pointcut b) {
return new ComposablePointcut(a.getClassFilter(), a.getMethodMatcher()).intersection(b);
}
/**
* Perform the least expensive check for a match.
*/
public static boolean matches(Pointcut pc, Method method, Class targetClass, Object[] arguments) {
if (pc == Pointcut.TRUE) {
return true;
}
if (pc.getClassFilter().matches(targetClass)) {
// Only check if it gets past first hurdle
MethodMatcher mm = pc.getMethodMatcher();
if (mm.matches(method, targetClass)) {
// We may need additional runtime (argument) check
return mm.isRuntime() ? mm.matches(method, targetClass, arguments) : true;
}
}
return false;
}
public static boolean equals(Pointcut a, Pointcut b) {
return a.getClassFilter() == b.getClassFilter() &&
a.getMethodMatcher() == b.getMethodMatcher();
}
}