/*
* Copyright 2002-2007 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.ClassFilter;
import org.springframework.aop.IntroductionAwareMethodMatcher;
import org.springframework.aop.MethodMatcher;
import org.springframework.util.Assert;
/**
* Static utility methods for composing
* {@link org.springframework.aop.MethodMatcher MethodMatchers}.
*
* <p>A MethodMatcher may be evaluated statically (based on method
* and target class) or need further evaluation dynamically
* (based on arguments at the time of method invocation).
*
* @author Rod Johnson
* @author Rob Harrop
* @author Juergen Hoeller
* @since 11.11.2003
* @see ClassFilters
* @see Pointcuts
*/
public abstract class MethodMatchers {
/**
* Match all methods that <i>either</i> (or both) of the given MethodMatchers matches.
* @param mm1 the first MethodMatcher
* @param mm2 the second MethodMatcher
* @return a distinct MethodMatcher that matches all methods that either
* of the given MethodMatchers matches
*/
public static MethodMatcher union(MethodMatcher mm1, MethodMatcher mm2) {
return new UnionMethodMatcher(mm1, mm2);
}
/**
* Match all methods that <i>either</i> (or both) of the given MethodMatchers matches.
* @param mm1 the first MethodMatcher
* @param cf1 the corresponding ClassFilter for the first MethodMatcher
* @param mm2 the second MethodMatcher
* @param cf2 the corresponding ClassFilter for the second MethodMatcher
* @return a distinct MethodMatcher that matches all methods that either
* of the given MethodMatchers matches
*/
static MethodMatcher union(MethodMatcher mm1, ClassFilter cf1, MethodMatcher mm2, ClassFilter cf2) {
return new ClassFilterAwareUnionMethodMatcher(mm1, cf1, mm2, cf2);
}
/**
* Match all methods that <i>both</i> of the given MethodMatchers match.
* @param mm1 the first MethodMatcher
* @param mm2 the second MethodMatcher
* @return a distinct MethodMatcher that matches all methods that both
* of the given MethodMatchers match
*/
public static MethodMatcher intersection(MethodMatcher mm1, MethodMatcher mm2) {
return new IntersectionMethodMatcher(mm1, mm2);
}
/**
* Apply the given MethodMatcher to the given Method, supporting an
* {@link org.springframework.aop.IntroductionAwareMethodMatcher}
* (if applicable).
* @param mm the MethodMatcher to apply (may be an IntroductionAwareMethodMatcher)
* @param method the candidate method
* @param targetClass the target class (may be <code>null</code>, in which case
* the candidate class must be taken to be the method's declaring class)
* @param hasIntroductions <code>true</code> if the object on whose behalf we are
* asking is the subject on one or more introductions; <code>false</code> otherwise
* @return whether or not this method matches statically
*/
public static boolean matches(MethodMatcher mm, Method method, Class targetClass, boolean hasIntroductions) {
Assert.notNull(mm, "MethodMatcher must not be null");
return ((mm instanceof IntroductionAwareMethodMatcher &&
((IntroductionAwareMethodMatcher) mm).matches(method, targetClass, hasIntroductions)) ||
mm.matches(method, targetClass));
}
/**
* MethodMatcher implementation for a union of two given MethodMatchers.
*/
private static class UnionMethodMatcher implements IntroductionAwareMethodMatcher, Serializable {
private MethodMatcher mm1;
private MethodMatcher mm2;
public UnionMethodMatcher(MethodMatcher mm1, MethodMatcher mm2) {
Assert.notNull(mm1, "First MethodMatcher must not be null");
Assert.notNull(mm2, "Second MethodMatcher must not be null");
this.mm1 = mm1;
this.mm2 = mm2;
}
public boolean matches(Method method, Class targetClass, boolean hasIntroductions) {
return (matchesClass1(targetClass) && MethodMatchers.matches(this.mm1, method, targetClass, hasIntroductions)) ||
(matchesClass2(targetClass) && MethodMatchers.matches(this.mm2, method, targetClass, hasIntroductions));
}
public boolean matches(Method method, Class targetClass) {
return (matchesClass1(targetClass) && this.mm1.matches(method, targetClass)) ||
(matchesClass2(targetClass) && this.mm2.matches(method, targetClass));
}
protected boolean matchesClass1(Class targetClass) {
return true;
}
protected boolean matchesClass2(Class targetClass) {
return true;
}
public boolean isRuntime() {
return this.mm1.isRuntime() || this.mm2.isRuntime();
}
public boolean matches(Method method, Class targetClass, Object[] args) {
return this.mm1.matches(method, targetClass, args) || this.mm2.matches(method, targetClass, args);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof UnionMethodMatcher)) {
return false;
}
UnionMethodMatcher that = (UnionMethodMatcher) obj;
return (this.mm1.equals(that.mm1) && this.mm2.equals(that.mm2));
}
@Override
public int hashCode() {
int hashCode = 17;
hashCode = 37 * hashCode + this.mm1.hashCode();
hashCode = 37 * hashCode + this.mm2.hashCode();
return hashCode;
}
}
/**
* MethodMatcher implementation for a union of two given MethodMatchers,
* supporting an associated ClassFilter per MethodMatcher.
*/
private static class ClassFilterAwareUnionMethodMatcher extends UnionMethodMatcher {
private final ClassFilter cf1;
private final ClassFilter cf2;
public ClassFilterAwareUnionMethodMatcher(MethodMatcher mm1, ClassFilter cf1, MethodMatcher mm2, ClassFilter cf2) {
super(mm1, mm2);
this.cf1 = cf1;
this.cf2 = cf2;
}
@Override
protected boolean matchesClass1(Class targetClass) {
return this.cf1.matches(targetClass);
}
@Override
protected boolean matchesClass2(Class targetClass) {
return this.cf2.matches(targetClass);
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof ClassFilterAwareUnionMethodMatcher)) {
return false;
}
ClassFilterAwareUnionMethodMatcher that = (ClassFilterAwareUnionMethodMatcher) other;
return (this.cf1.equals(that.cf1) && this.cf2.equals(that.cf2) && super.equals(other));
}
}
/**
* MethodMatcher implementation for an intersection of two given MethodMatchers.
*/
private static class IntersectionMethodMatcher implements IntroductionAwareMethodMatcher, Serializable {
private MethodMatcher mm1;
private MethodMatcher mm2;
public IntersectionMethodMatcher(MethodMatcher mm1, MethodMatcher mm2) {
Assert.notNull(mm1, "First MethodMatcher must not be null");
Assert.notNull(mm2, "Second MethodMatcher must not be null");
this.mm1 = mm1;
this.mm2 = mm2;
}
public boolean matches(Method method, Class targetClass, boolean hasIntroductions) {
return MethodMatchers.matches(this.mm1, method, targetClass, hasIntroductions) &&
MethodMatchers.matches(this.mm2, method, targetClass, hasIntroductions);
}
public boolean matches(Method method, Class targetClass) {
return this.mm1.matches(method, targetClass) && this.mm2.matches(method, targetClass);
}
public boolean isRuntime() {
return this.mm1.isRuntime() || this.mm2.isRuntime();
}
public boolean matches(Method method, Class targetClass, Object[] args) {
// Because a dynamic intersection may be composed of a static and dynamic part,
// we must avoid calling the 3-arg matches method on a dynamic matcher, as
// it will probably be an unsupported operation.
boolean aMatches = this.mm1.isRuntime() ?
this.mm1.matches(method, targetClass, args) : this.mm1.matches(method, targetClass);
boolean bMatches = this.mm2.isRuntime() ?
this.mm2.matches(method, targetClass, args) : this.mm2.matches(method, targetClass);
return aMatches && bMatches;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof IntersectionMethodMatcher)) {
return false;
}
IntersectionMethodMatcher that = (IntersectionMethodMatcher) other;
return (this.mm1.equals(that.mm1) && this.mm2.equals(that.mm2));
}
@Override
public int hashCode() {
int hashCode = 17;
hashCode = 37 * hashCode + this.mm1.hashCode();
hashCode = 37 * hashCode + this.mm2.hashCode();
return hashCode;
}
}
}
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