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/*
* 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.config;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.springframework.aop.aspectj.AspectJAfterAdvice;
import org.springframework.aop.aspectj.AspectJAfterReturningAdvice;
import org.springframework.aop.aspectj.AspectJAfterThrowingAdvice;
import org.springframework.aop.aspectj.AspectJAroundAdvice;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.aspectj.AspectJMethodBeforeAdvice;
import org.springframework.aop.aspectj.AspectJPointcutAdvisor;
import org.springframework.aop.aspectj.DeclareParentsAdvisor;
import org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanReference;
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.beans.factory.config.RuntimeBeanNameReference;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.parsing.CompositeComponentDefinition;
import org.springframework.beans.factory.parsing.ParseState;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;
/**
* {@link BeanDefinitionParser} for the <aop:config> tag.
*
* @author Rob Harrop
* @author Adrian Colyer
* @author Rod Johnson
* @author Juergen Hoeller
* @author Mark Fisher
* @since 2.0
*/
class ConfigBeanDefinitionParser implements BeanDefinitionParser {
private static final String ASPECT = "aspect";
private static final String EXPRESSION = "expression";
private static final String ID = "id";
private static final String POINTCUT = "pointcut";
private static final String ADVICE_BEAN_NAME = "adviceBeanName";
private static final String ADVISOR = "advisor";
private static final String ADVICE_REF = "advice-ref";
private static final String POINTCUT_REF = "pointcut-ref";
private static final String REF = "ref";
private static final String BEFORE = "before";
private static final String DECLARE_PARENTS = "declare-parents";
private static final String TYPE_PATTERN = "types-matching";
private static final String DEFAULT_IMPL = "default-impl";
private static final String IMPLEMENT_INTERFACE = "implement-interface";
private static final String AFTER = "after";
private static final String AFTER_RETURNING_ELEMENT = "after-returning";
private static final String AFTER_THROWING_ELEMENT = "after-throwing";
private static final String AROUND = "around";
private static final String PROXY_TARGET_CLASS = "proxy-target-class";
private static final String RETURNING = "returning";
private static final String RETURNING_PROPERTY = "returningName";
private static final String THROWING = "throwing";
private static final String THROWING_PROPERTY = "throwingName";
private static final String ARG_NAMES = "arg-names";
private static final String ARG_NAMES_PROPERTY = "argumentNames";
private static final String ASPECT_NAME_PROPERTY = "aspectName";
private static final String DECLARATION_ORDER_PROPERTY = "declarationOrder";
private static final String ORDER_PROPERTY = "order";
private static final int METHOD_INDEX = 0;
private static final int POINTCUT_INDEX = 1;
private static final int ASPECT_INSTANCE_FACTORY_INDEX = 2;
private ParseState parseState = new ParseState();
public BeanDefinition parse(Element element, ParserContext parserContext) {
CompositeComponentDefinition compositeDef =
new CompositeComponentDefinition(element.getTagName(), parserContext.extractSource(element));
parserContext.pushContainingComponent(compositeDef);
configureAutoProxyCreator(parserContext, element);
NodeList childNodes = element.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
Node node = childNodes.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
String localName = node.getLocalName();
if (POINTCUT.equals(localName)) {
parsePointcut((Element) node, parserContext);
}
else if (ADVISOR.equals(localName)) {
parseAdvisor((Element) node, parserContext);
}
else if (ASPECT.equals(localName)) {
parseAspect((Element) node, parserContext);
}
}
}
parserContext.popAndRegisterContainingComponent();
return null;
}
/**
* Configures the auto proxy creator needed to support the {@link BeanDefinition BeanDefinitions}
* created by the '<aop:config/>' tag. Will force class proxying if the
* 'proxy-target-class' attribute is set to 'true'.
* @see AopNamespaceUtils
*/
private void configureAutoProxyCreator(ParserContext parserContext, Element element) {
AopNamespaceUtils.registerAspectJAutoProxyCreatorIfNecessary(parserContext, element);
boolean proxyTargetClass = Boolean.valueOf(element.getAttribute(PROXY_TARGET_CLASS)).booleanValue();
if (proxyTargetClass) {
AopNamespaceUtils.forceAutoProxyCreatorToUseClassProxying(parserContext.getRegistry());
}
}
/**
* Parses the supplied <advisor> element and registers the resulting
* {@link org.springframework.aop.Advisor} and any resulting {@link org.springframework.aop.Pointcut}
* with the supplied {@link BeanDefinitionRegistry}.
*/
private void parseAdvisor(Element advisorElement, ParserContext parserContext) {
AbstractBeanDefinition advisorDef = createAdvisorBeanDefinition(advisorElement, parserContext);
String id = advisorElement.getAttribute(ID);
try {
this.parseState.push(new AdvisorEntry(id));
String pointcutBeanName = parsePointcutProperty(advisorElement, parserContext);
advisorDef.getPropertyValues().addPropertyValue(POINTCUT, new RuntimeBeanReference(pointcutBeanName));
String advisorBeanName = id;
if (StringUtils.hasText(advisorBeanName)) {
parserContext.getRegistry().registerBeanDefinition(advisorBeanName, advisorDef);
}
else {
advisorBeanName = parserContext.getReaderContext().registerWithGeneratedName(advisorDef);
}
boolean pointcutRef = advisorElement.hasAttribute(POINTCUT_REF);
if (pointcutBeanName != null) {
// no errors so fire event
fireAdvisorEvent(advisorBeanName, pointcutBeanName, advisorDef, parserContext, pointcutRef);
}
}
finally {
this.parseState.pop();
}
}
/**
* Creates the {@link AdvisorComponentDefinition} appropriate to the supplied
* advisor bean definition and fires it through the {@link ParserContext}.
*/
private void fireAdvisorEvent(
String advisorBeanName, String pointcutBeanName, AbstractBeanDefinition advisorDef,
ParserContext parserContext, boolean pointcutRef) {
AdvisorComponentDefinition componentDefinition;
if (pointcutRef) {
componentDefinition = new AdvisorComponentDefinition(advisorBeanName, advisorDef);
}
else {
BeanDefinition pointcutDefinition = parserContext.getRegistry().getBeanDefinition(pointcutBeanName);
componentDefinition = new AdvisorComponentDefinition(advisorBeanName, advisorDef, pointcutDefinition);
}
parserContext.registerComponent(componentDefinition);
}
/**
* Create a {@link RootBeanDefinition} for the advisor described in the supplied. Does not
* parse any associated 'pointcut' or 'pointcut-ref' attributes.
*/
private AbstractBeanDefinition createAdvisorBeanDefinition(Element advisorElement, ParserContext parserContext) {
RootBeanDefinition advisorDefinition = new RootBeanDefinition(DefaultBeanFactoryPointcutAdvisor.class);
advisorDefinition.setSource(parserContext.extractSource(advisorElement));
if (advisorElement.hasAttribute(ORDER_PROPERTY)) {
advisorDefinition.getPropertyValues().addPropertyValue(
ORDER_PROPERTY, advisorElement.getAttribute(ORDER_PROPERTY));
}
advisorDefinition.getPropertyValues().addPropertyValue(
ADVICE_BEAN_NAME, new RuntimeBeanNameReference(advisorElement.getAttribute(ADVICE_REF)));
return advisorDefinition;
}
private void parseAspect(Element aspectElement, ParserContext parserContext) {
String aspectId = aspectElement.getAttribute(ID);
String aspectName = aspectElement.getAttribute(REF);
if (!StringUtils.hasText(aspectName)) {
parserContext.getReaderContext().error(
" tag needs aspect bean reference via 'ref' attribute.",
aspectElement, this.parseState.snapshot());
return;
}
try {
this.parseState.push(new AspectEntry(aspectId, aspectName));
List beanDefinitions = new ArrayList();
List beanReferences = new ArrayList();
beanReferences.add(new RuntimeBeanReference(aspectName));
List declareParents = DomUtils.getChildElementsByTagName(aspectElement, DECLARE_PARENTS);
for (int i = METHOD_INDEX; i < declareParents.size(); i++) {
Element declareParentsElement = (Element) declareParents.get(i);
beanDefinitions.add(parseDeclareParents(declareParentsElement, parserContext));
}
// We have to parse "advice" and all the advice kinds in one loop, to get the
// ordering semantics right.
NodeList nodeList = aspectElement.getChildNodes();
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
if (isAdviceNode(node)) {
AbstractBeanDefinition advisorDefinition =
parseAdvice(aspectName, i, aspectElement, (Element) node, parserContext, beanReferences);
beanDefinitions.add(advisorDefinition);
}
}
AspectComponentDefinition aspectComponentDefinition = createAspectComponentDefinition(
aspectElement, aspectId, beanDefinitions, beanReferences, parserContext);
parserContext.pushContainingComponent(aspectComponentDefinition);
List pointcuts = DomUtils.getChildElementsByTagName(aspectElement, POINTCUT);
for (int i = 0; i < pointcuts.size(); i++) {
Element pointcutElement = (Element) pointcuts.get(i);
parsePointcut(pointcutElement, parserContext);
}
parserContext.popAndRegisterContainingComponent();
}
finally {
this.parseState.pop();
}
}
private AspectComponentDefinition createAspectComponentDefinition(
Element aspectElement, String aspectId, List beanDefs, List beanRefs, ParserContext parserContext) {
BeanDefinition[] beanDefArray = (BeanDefinition[]) beanDefs.toArray(new BeanDefinition[beanDefs.size()]);
BeanReference[] beanRefArray = (BeanReference[]) beanRefs.toArray(new BeanReference[beanRefs.size()]);
Object source = parserContext.extractSource(aspectElement);
return new AspectComponentDefinition(aspectId, beanDefArray, beanRefArray, source);
}
/**
* Return true if the supplied node describes an advice type. May be one of:
* 'before', 'after', 'after-returning',
* 'after-throwing' or 'around'.
*/
private boolean isAdviceNode(Node aNode) {
if (!(aNode instanceof Element)) {
return false;
}
else {
String name = aNode.getLocalName();
return (BEFORE.equals(name) || AFTER.equals(name) || AFTER_RETURNING_ELEMENT.equals(name) ||
AFTER_THROWING_ELEMENT.equals(name) || AROUND.equals(name));
}
}
/**
* Parse a 'declare-parents' element and register the appropriate
* DeclareParentsAdvisor with the BeanDefinitionRegistry encapsulated in the
* supplied ParserContext.
*/
private AbstractBeanDefinition parseDeclareParents(Element declareParentsElement, ParserContext parserContext) {
BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(DeclareParentsAdvisor.class);
builder.addConstructorArg(declareParentsElement.getAttribute(IMPLEMENT_INTERFACE));
builder.addConstructorArg(declareParentsElement.getAttribute(TYPE_PATTERN));
builder.addConstructorArg(declareParentsElement.getAttribute(DEFAULT_IMPL));
builder.setSource(parserContext.extractSource(declareParentsElement));
AbstractBeanDefinition definition = builder.getBeanDefinition();
parserContext.getReaderContext().registerWithGeneratedName(definition);
return definition;
}
/**
* Parses one of 'before', 'after', 'after-returning',
* 'after-throwing' or 'around' and registers the resulting
* BeanDefinition with the supplied BeanDefinitionRegistry.
* @return the generated advice RootBeanDefinition
*/
private AbstractBeanDefinition parseAdvice(String aspectName, int order,
Element aspectElement, Element adviceElement, ParserContext parserContext, List beanReferences) {
try {
this.parseState.push(new AdviceEntry(adviceElement.getLocalName()));
// create the method factory bean
RootBeanDefinition methodDefinition = new RootBeanDefinition(MethodLocatingFactoryBean.class);
methodDefinition.getPropertyValues().addPropertyValue("targetBeanName", aspectName);
methodDefinition.getPropertyValues().addPropertyValue("methodName", adviceElement.getAttribute("method"));
methodDefinition.setSynthetic(true);
// create instance factory definition
RootBeanDefinition aspectFactoryDef = new RootBeanDefinition(SimpleBeanFactoryAwareAspectInstanceFactory.class);
aspectFactoryDef.getPropertyValues().addPropertyValue("aspectBeanName", aspectName);
aspectFactoryDef.setSynthetic(true);
// register the pointcut
AbstractBeanDefinition adviceDef = createAdviceDefinition(
adviceElement, parserContext, aspectName, order, methodDefinition, aspectFactoryDef, beanReferences);
// configure the advisor
RootBeanDefinition advisorDefinition = new RootBeanDefinition(AspectJPointcutAdvisor.class);
advisorDefinition.setSource(parserContext.extractSource(adviceElement));
advisorDefinition.getConstructorArgumentValues().addGenericArgumentValue(adviceDef);
if (aspectElement.hasAttribute(ORDER_PROPERTY)) {
advisorDefinition.getPropertyValues().addPropertyValue(
ORDER_PROPERTY, aspectElement.getAttribute(ORDER_PROPERTY));
}
// register the final advisor
parserContext.getReaderContext().registerWithGeneratedName(advisorDefinition);
return advisorDefinition;
}
finally {
this.parseState.pop();
}
}
/**
* Creates the RootBeanDefinition for a POJO advice bean. Also causes pointcut
* parsing to occur so that the pointcut may be associate with the advice bean.
* This same pointcut is also configured as the pointcut for the enclosing
* Advisor definition using the supplied MutablePropertyValues.
*/
private AbstractBeanDefinition createAdviceDefinition(
Element adviceElement, ParserContext parserContext, String aspectName, int order,
RootBeanDefinition methodDef, RootBeanDefinition aspectFactoryDef, List beanReferences) {
String pointcutBeanName = parsePointcutProperty(adviceElement, parserContext);
RuntimeBeanReference pointcutRef = new RuntimeBeanReference(pointcutBeanName);
beanReferences.add(pointcutRef);
RootBeanDefinition adviceDefinition = new RootBeanDefinition(getAdviceClass(adviceElement));
adviceDefinition.setSource(parserContext.extractSource(adviceElement));
adviceDefinition.getPropertyValues().addPropertyValue(ASPECT_NAME_PROPERTY, aspectName);
adviceDefinition.getPropertyValues().addPropertyValue(DECLARATION_ORDER_PROPERTY, new Integer(order));
if (adviceElement.hasAttribute(RETURNING)) {
adviceDefinition.getPropertyValues().addPropertyValue(RETURNING_PROPERTY, adviceElement.getAttribute(RETURNING));
}
if (adviceElement.hasAttribute(THROWING)) {
adviceDefinition.getPropertyValues().addPropertyValue(THROWING_PROPERTY, adviceElement.getAttribute(THROWING));
}
if (adviceElement.hasAttribute(ARG_NAMES)) {
adviceDefinition.getPropertyValues().addPropertyValue(ARG_NAMES_PROPERTY, adviceElement.getAttribute(ARG_NAMES));
}
ConstructorArgumentValues cav = adviceDefinition.getConstructorArgumentValues();
cav.addIndexedArgumentValue(METHOD_INDEX, methodDef);
cav.addIndexedArgumentValue(POINTCUT_INDEX, pointcutRef);
cav.addIndexedArgumentValue(ASPECT_INSTANCE_FACTORY_INDEX, aspectFactoryDef);
return adviceDefinition;
}
/**
* Gets the advice implementation class corresponding to the supplied {@link Element}.
*/
private Class getAdviceClass(Element adviceElement) {
String elementName = adviceElement.getLocalName();
if (BEFORE.equals(elementName)) {
return AspectJMethodBeforeAdvice.class;
}
else if (AFTER.equals(elementName)) {
return AspectJAfterAdvice.class;
}
else if (AFTER_RETURNING_ELEMENT.equals(elementName)) {
return AspectJAfterReturningAdvice.class;
}
else if (AFTER_THROWING_ELEMENT.equals(elementName)) {
return AspectJAfterThrowingAdvice.class;
}
else if (AROUND.equals(elementName)) {
return AspectJAroundAdvice.class;
}
else {
throw new IllegalArgumentException("Unknown advice kind [" + elementName + "].");
}
}
/**
* Parses the supplied <pointcut> and registers the resulting
* Pointcut with the BeanDefinitionRegistry.
*/
private AbstractBeanDefinition parsePointcut(Element pointcutElement, ParserContext parserContext) {
String id = pointcutElement.getAttribute(ID);
String expression = pointcutElement.getAttribute(EXPRESSION);
AbstractBeanDefinition pointcutDefinition = null;
try {
this.parseState.push(new PointcutEntry(id));
pointcutDefinition = createPointcutDefinition(expression);
pointcutDefinition.setSource(parserContext.extractSource(pointcutElement));
if (StringUtils.hasText(id)) {
parserContext.getRegistry().registerBeanDefinition(id, pointcutDefinition);
}
else {
parserContext.getReaderContext().registerWithGeneratedName(pointcutDefinition);
}
parserContext.registerComponent(
new PointcutComponentDefinition(id, pointcutDefinition, expression));
}
finally {
this.parseState.pop();
}
return pointcutDefinition;
}
/**
* Parses the pointcut or pointcut-ref attributes of the supplied
* {@link Element} and add a pointcut property as appropriate. Generates a
* {@link org.springframework.beans.factory.config.BeanDefinition} for the pointcut if necessary
* and returns its bean name, otherwise returns the bean name of the referred pointcut.
*/
private String parsePointcutProperty(Element element, ParserContext parserContext) {
if (element.hasAttribute(POINTCUT) && element.hasAttribute(POINTCUT_REF)) {
parserContext.getReaderContext().error(
"Cannot define both 'pointcut' and 'pointcut-ref' on tag.",
element, this.parseState.snapshot());
return null;
}
else if (element.hasAttribute(POINTCUT)) {
// Create a pointcut for the anonymous pc and register it.
Attr pointcutAttr = element.getAttributeNode(POINTCUT);
AbstractBeanDefinition pointcutDefinition = createPointcutDefinition(pointcutAttr.getValue());
pointcutDefinition.setSource(parserContext.extractSource(element));
return parserContext.getReaderContext().registerWithGeneratedName(pointcutDefinition);
}
else if (element.hasAttribute(POINTCUT_REF)) {
return element.getAttribute(POINTCUT_REF);
}
else {
parserContext.getReaderContext().error(
"Must define one of 'pointcut' or 'pointcut-ref' on tag.",
element, this.parseState.snapshot());
return null;
}
}
/**
* Creates a {@link BeanDefinition} for the {@link AspectJExpressionPointcut} class using
* the supplied pointcut expression.
*/
protected AbstractBeanDefinition createPointcutDefinition(String expression) {
RootBeanDefinition beanDefinition = new RootBeanDefinition(AspectJExpressionPointcut.class);
beanDefinition.setSingleton(false);
beanDefinition.setSynthetic(true);
beanDefinition.getPropertyValues().addPropertyValue(EXPRESSION, expression);
return beanDefinition;
}
}
