/*
* Copyright 2002-2008 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.util.HashSet;
import java.util.Set;
import org.aopalliance.aop.Advice;
import org.springframework.aop.ClassFilter;
import org.springframework.aop.DynamicIntroductionAdvice;
import org.springframework.aop.IntroductionAdvisor;
import org.springframework.aop.IntroductionInfo;
import org.springframework.core.Ordered;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* Simple {@link org.springframework.aop.IntroductionAdvisor} implementation
* that by default applies to any class.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 11.11.2003
*/
@SuppressWarnings({ "unchecked", "serial" })
public class DefaultIntroductionAdvisor implements IntroductionAdvisor, ClassFilter, Ordered, Serializable {
private final Advice advice;
private final Set<Class> interfaces = new HashSet<Class>();
private int order = Integer.MAX_VALUE;
/**
* Create a DefaultIntroductionAdvisor for the given advice.
* @param advice the Advice to apply (may implement the
* {@link org.springframework.aop.IntroductionInfo} interface)
* @see #addInterface
*/
public DefaultIntroductionAdvisor(Advice advice) {
this(advice, (advice instanceof IntroductionInfo ? (IntroductionInfo) advice : null));
}
/**
* Create a DefaultIntroductionAdvisor for the given advice.
* @param advice the Advice to apply
* @param introductionInfo the IntroductionInfo that describes
* the interface to introduce (may be <code>null</code>)
*/
public DefaultIntroductionAdvisor(Advice advice, IntroductionInfo introductionInfo) {
Assert.notNull(advice, "Advice must not be null");
this.advice = advice;
if (introductionInfo != null) {
Class[] introducedInterfaces = introductionInfo.getInterfaces();
if (introducedInterfaces.length == 0) {
throw new IllegalArgumentException("IntroductionAdviceSupport implements no interfaces");
}
for (Class ifc : introducedInterfaces) {
addInterface(ifc);
}
}
}
/**
* Create a DefaultIntroductionAdvisor for the given advice.
* @param advice the Advice to apply
* @param intf the interface to introduce
*/
public DefaultIntroductionAdvisor(DynamicIntroductionAdvice advice, Class intf) {
Assert.notNull(advice, "Advice must not be null");
this.advice = advice;
addInterface(intf);
}
/**
* Add the specified interface to the list of interfaces to introduce.
* @param intf the interface to introduce
*/
public void addInterface(Class intf) {
Assert.notNull(intf, "Interface must not be null");
if (!intf.isInterface()) {
throw new IllegalArgumentException("Specified class [" + intf.getName() + "] must be an interface");
}
this.interfaces.add(intf);
}
public Class[] getInterfaces() {
return this.interfaces.toArray(new Class[this.interfaces.size()]);
}
public void validateInterfaces() throws IllegalArgumentException {
for (Class ifc : this.interfaces) {
if (this.advice instanceof DynamicIntroductionAdvice &&
!((DynamicIntroductionAdvice) this.advice).implementsInterface(ifc)) {
throw new IllegalArgumentException("DynamicIntroductionAdvice [" + this.advice + "] " +
"does not implement interface [" + ifc.getName() + "] specified for introduction");
}
}
}
public void setOrder(int order) {
this.order = order;
}
public int getOrder() {
return this.order;
}
public Advice getAdvice() {
return this.advice;
}
public boolean isPerInstance() {
return true;
}
public ClassFilter getClassFilter() {
return this;
}
public boolean matches(Class clazz) {
return true;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof DefaultIntroductionAdvisor)) {
return false;
}
DefaultIntroductionAdvisor otherAdvisor = (DefaultIntroductionAdvisor) other;
return (this.advice.equals(otherAdvisor.advice) && this.interfaces.equals(otherAdvisor.interfaces));
}
@Override
public int hashCode() {
return this.advice.hashCode() * 13 + this.interfaces.hashCode();
}
@Override
public String toString() {
return ClassUtils.getShortName(getClass()) + ": advice [" + this.advice + "]; interfaces " +
ClassUtils.classNamesToString(this.interfaces);
}
}
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