/*
* 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 org.springframework.aop.ClassFilter;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* Static utility methods for composing
* {@link org.springframework.aop.ClassFilter ClassFilters}.
*
* @author Rod Johnson
* @author Rob Harrop
* @author Juergen Hoeller
* @since 11.11.2003
* @see MethodMatchers
* @see Pointcuts
*/
public abstract class ClassFilters {
/**
* Match all classes that <i>either</i> (or both) of the given ClassFilters matches.
* @param cf1 the first ClassFilter
* @param cf2 the second ClassFilter
* @return a distinct ClassFilter that matches all classes that either
* of the given ClassFilter matches
*/
public static ClassFilter union(ClassFilter cf1, ClassFilter cf2) {
Assert.notNull(cf1, "First ClassFilter must not be null");
Assert.notNull(cf2, "Second ClassFilter must not be null");
return new UnionClassFilter(new ClassFilter[] {cf1, cf2});
}
/**
* Match all classes that <i>either</i> (or all) of the given ClassFilters matches.
* @param classFilters the ClassFilters to match
* @return a distinct ClassFilter that matches all classes that either
* of the given ClassFilter matches
*/
public static ClassFilter union(ClassFilter[] classFilters) {
Assert.notEmpty(classFilters, "ClassFilter array must not be empty");
return new UnionClassFilter(classFilters);
}
/**
* Match all classes that <i>both</i> of the given ClassFilters match.
* @param cf1 the first ClassFilter
* @param cf2 the second ClassFilter
* @return a distinct ClassFilter that matches all classes that both
* of the given ClassFilter match
*/
public static ClassFilter intersection(ClassFilter cf1, ClassFilter cf2) {
Assert.notNull(cf1, "First ClassFilter must not be null");
Assert.notNull(cf2, "Second ClassFilter must not be null");
return new IntersectionClassFilter(new ClassFilter[] {cf1, cf2});
}
/**
* Match all classes that <i>all</i> of the given ClassFilters match.
* @param classFilters the ClassFilters to match
* @return a distinct ClassFilter that matches all classes that both
* of the given ClassFilter match
*/
public static ClassFilter intersection(ClassFilter[] classFilters) {
Assert.notEmpty(classFilters, "ClassFilter array must not be empty");
return new IntersectionClassFilter(classFilters);
}
/**
* ClassFilter implementation for a union of the given ClassFilters.
*/
private static class UnionClassFilter implements ClassFilter, Serializable {
private ClassFilter[] filters;
public UnionClassFilter(ClassFilter[] filters) {
this.filters = filters;
}
public boolean matches(Class clazz) {
for (int i = 0; i < this.filters.length; i++) {
if (this.filters[i].matches(clazz)) {
return true;
}
}
return false;
}
@Override
public boolean equals(Object other) {
return (this == other || (other instanceof UnionClassFilter &&
ObjectUtils.nullSafeEquals(this.filters, ((UnionClassFilter) other).filters)));
}
@Override
public int hashCode() {
return ObjectUtils.nullSafeHashCode(this.filters);
}
}
/**
* ClassFilter implementation for an intersection of the given ClassFilters.
*/
private static class IntersectionClassFilter implements ClassFilter, Serializable {
private ClassFilter[] filters;
public IntersectionClassFilter(ClassFilter[] filters) {
this.filters = filters;
}
public boolean matches(Class clazz) {
for (int i = 0; i < this.filters.length; i++) {
if (!this.filters[i].matches(clazz)) {
return false;
}
}
return true;
}
@Override
public boolean equals(Object other) {
return (this == other || (other instanceof IntersectionClassFilter &&
ObjectUtils.nullSafeEquals(this.filters, ((IntersectionClassFilter) other).filters)));
}
@Override
public int hashCode() {
return ObjectUtils.nullSafeHashCode(this.filters);
}
}
}
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