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/*
* Copyright 2002-2024 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
*
* https://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.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.lang.Nullable;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;
/**
* {@link BeanDefinitionParser} for the {@code } tag.
*
* @author Rob Harrop
* @author Juergen Hoeller
* @author Adrian Colyer
* @author Mark Fisher
* @author Ramnivas Laddad
* @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 DELEGATE_REF = "delegate-ref";
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 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 final ParseState parseState = new ParseState();
@Override
@Nullable
public BeanDefinition parse(Element element, ParserContext parserContext) {
CompositeComponentDefinition compositeDef =
new CompositeComponentDefinition(element.getTagName(), parserContext.extractSource(element));
parserContext.pushContainingComponent(compositeDef);
configureAutoProxyCreator(parserContext, element);
List childElts = DomUtils.getChildElements(element);
for (Element elt: childElts) {
String localName = parserContext.getDelegate().getLocalName(elt);
switch (localName) {
case POINTCUT -> parsePointcut(elt, parserContext);
case ADVISOR -> parseAdvisor(elt, parserContext);
case ASPECT -> parseAspect(elt, parserContext);
}
}
parserContext.popAndRegisterContainingComponent();
return null;
}
/**
* Configures the auto proxy creator needed to support the {@link BeanDefinition BeanDefinitions}
* created by the '{@code } 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 advisorBeanName = id;
if (StringUtils.hasText(advisorBeanName)) {
parserContext.getRegistry().registerBeanDefinition(advisorBeanName, advisorDef);
}
else {
advisorBeanName = parserContext.getReaderContext().registerWithGeneratedName(advisorDef);
}
Object pointcut = parsePointcutProperty(advisorElement, parserContext);
if (pointcut instanceof BeanDefinition beanDefinition) {
advisorDef.getPropertyValues().add(POINTCUT, pointcut);
parserContext.registerComponent(
new AdvisorComponentDefinition(advisorBeanName, advisorDef, beanDefinition));
}
else if (pointcut instanceof String beanName) {
advisorDef.getPropertyValues().add(POINTCUT, new RuntimeBeanReference(beanName));
parserContext.registerComponent(
new AdvisorComponentDefinition(advisorBeanName, advisorDef));
}
}
finally {
this.parseState.pop();
}
}
/**
* Create a {@link RootBeanDefinition} for the advisor described in the supplied. Does not
* parse any associated '{@code pointcut}' or '{@code pointcut-ref}' attributes.
*/
private AbstractBeanDefinition createAdvisorBeanDefinition(Element advisorElement, ParserContext parserContext) {
RootBeanDefinition advisorDefinition = new RootBeanDefinition(DefaultBeanFactoryPointcutAdvisor.class);
advisorDefinition.setSource(parserContext.extractSource(advisorElement));
String adviceRef = advisorElement.getAttribute(ADVICE_REF);
if (!StringUtils.hasText(adviceRef)) {
parserContext.getReaderContext().error(
"'advice-ref' attribute contains empty value.", advisorElement, this.parseState.snapshot());
}
else {
advisorDefinition.getPropertyValues().add(
ADVICE_BEAN_NAME, new RuntimeBeanNameReference(adviceRef));
}
if (advisorElement.hasAttribute(ORDER_PROPERTY)) {
advisorDefinition.getPropertyValues().add(
ORDER_PROPERTY, advisorElement.getAttribute(ORDER_PROPERTY));
}
return advisorDefinition;
}
private void parseAspect(Element aspectElement, ParserContext parserContext) {
String aspectId = aspectElement.getAttribute(ID);
String aspectName = aspectElement.getAttribute(REF);
try {
this.parseState.push(new AspectEntry(aspectId, aspectName));
List beanDefinitions = new ArrayList<>();
List beanReferences = new ArrayList<>();
List declareParents = DomUtils.getChildElementsByTagName(aspectElement, DECLARE_PARENTS);
for (Element declareParent : declareParents) {
beanDefinitions.add(parseDeclareParents(declareParent, parserContext));
}
// We have to parse "advice" and all the advice kinds in one loop, to get the
// ordering semantics right.
NodeList nodeList = aspectElement.getChildNodes();
boolean adviceFoundAlready = false;
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
if (isAdviceNode(node, parserContext)) {
if (!adviceFoundAlready) {
adviceFoundAlready = true;
if (!StringUtils.hasText(aspectName)) {
parserContext.getReaderContext().error(
" tag needs aspect bean reference via 'ref' attribute when declaring advices.",
aspectElement, this.parseState.snapshot());
return;
}
beanReferences.add(new RuntimeBeanReference(aspectName));
}
AbstractBeanDefinition advisorDefinition = parseAdvice(
aspectName, i, aspectElement, (Element) node, parserContext, beanDefinitions, beanReferences);
beanDefinitions.add(advisorDefinition);
}
}
AspectComponentDefinition aspectComponentDefinition = createAspectComponentDefinition(
aspectElement, aspectId, beanDefinitions, beanReferences, parserContext);
parserContext.pushContainingComponent(aspectComponentDefinition);
List pointcuts = DomUtils.getChildElementsByTagName(aspectElement, POINTCUT);
for (Element pointcutElement : pointcuts) {
parsePointcut(pointcutElement, parserContext);
}
parserContext.popAndRegisterContainingComponent();
}
finally {
this.parseState.pop();
}
}
private AspectComponentDefinition createAspectComponentDefinition(
Element aspectElement, String aspectId, List beanDefs,
List beanRefs, ParserContext parserContext) {
BeanDefinition[] beanDefArray = beanDefs.toArray(new BeanDefinition[0]);
BeanReference[] beanRefArray = beanRefs.toArray(new BeanReference[0]);
Object source = parserContext.extractSource(aspectElement);
return new AspectComponentDefinition(aspectId, beanDefArray, beanRefArray, source);
}
/**
* Return {@code true} if the supplied node describes an advice type. May be one of:
* '{@code before}', '{@code after}', '{@code after-returning}',
* '{@code after-throwing}' or '{@code around}'.
*/
private boolean isAdviceNode(Node aNode, ParserContext parserContext) {
if (!(aNode instanceof Element)) {
return false;
}
else {
String name = parserContext.getDelegate().getLocalName(aNode);
return (BEFORE.equals(name) || AFTER.equals(name) || AFTER_RETURNING_ELEMENT.equals(name) ||
AFTER_THROWING_ELEMENT.equals(name) || AROUND.equals(name));
}
}
/**
* Parse a '{@code 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.addConstructorArgValue(declareParentsElement.getAttribute(IMPLEMENT_INTERFACE));
builder.addConstructorArgValue(declareParentsElement.getAttribute(TYPE_PATTERN));
String defaultImpl = declareParentsElement.getAttribute(DEFAULT_IMPL);
String delegateRef = declareParentsElement.getAttribute(DELEGATE_REF);
if (StringUtils.hasText(defaultImpl) && !StringUtils.hasText(delegateRef)) {
builder.addConstructorArgValue(defaultImpl);
}
else if (StringUtils.hasText(delegateRef) && !StringUtils.hasText(defaultImpl)) {
builder.addConstructorArgReference(delegateRef);
}
else {
parserContext.getReaderContext().error(
"Exactly one of the " + DEFAULT_IMPL + " or " + DELEGATE_REF + " attributes must be specified",
declareParentsElement, this.parseState.snapshot());
}
AbstractBeanDefinition definition = builder.getBeanDefinition();
definition.setSource(parserContext.extractSource(declareParentsElement));
parserContext.getReaderContext().registerWithGeneratedName(definition);
return definition;
}
/**
* Parses one of '{@code before}', '{@code after}', '{@code after-returning}',
* '{@code after-throwing}' or '{@code 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 beanDefinitions, List beanReferences) {
try {
this.parseState.push(new AdviceEntry(parserContext.getDelegate().getLocalName(adviceElement)));
// create the method factory bean
RootBeanDefinition methodDefinition = new RootBeanDefinition(MethodLocatingFactoryBean.class);
methodDefinition.getPropertyValues().add("targetBeanName", aspectName);
methodDefinition.getPropertyValues().add("methodName", adviceElement.getAttribute("method"));
methodDefinition.setSynthetic(true);
// create instance factory definition
RootBeanDefinition aspectFactoryDef =
new RootBeanDefinition(SimpleBeanFactoryAwareAspectInstanceFactory.class);
aspectFactoryDef.getPropertyValues().add("aspectBeanName", aspectName);
aspectFactoryDef.setSynthetic(true);
// register the pointcut
AbstractBeanDefinition adviceDef = createAdviceDefinition(
adviceElement, parserContext, aspectName, order, methodDefinition, aspectFactoryDef,
beanDefinitions, 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().add(
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 beanDefinitions, List beanReferences) {
RootBeanDefinition adviceDefinition = new RootBeanDefinition(getAdviceClass(adviceElement, parserContext));
adviceDefinition.setSource(parserContext.extractSource(adviceElement));
adviceDefinition.getPropertyValues().add(ASPECT_NAME_PROPERTY, aspectName);
adviceDefinition.getPropertyValues().add(DECLARATION_ORDER_PROPERTY, order);
if (adviceElement.hasAttribute(RETURNING)) {
adviceDefinition.getPropertyValues().add(
RETURNING_PROPERTY, adviceElement.getAttribute(RETURNING));
}
if (adviceElement.hasAttribute(THROWING)) {
adviceDefinition.getPropertyValues().add(
THROWING_PROPERTY, adviceElement.getAttribute(THROWING));
}
if (adviceElement.hasAttribute(ARG_NAMES)) {
adviceDefinition.getPropertyValues().add(
ARG_NAMES_PROPERTY, adviceElement.getAttribute(ARG_NAMES));
}
ConstructorArgumentValues cav = adviceDefinition.getConstructorArgumentValues();
cav.addIndexedArgumentValue(METHOD_INDEX, methodDef);
Object pointcut = parsePointcutProperty(adviceElement, parserContext);
if (pointcut instanceof BeanDefinition beanDefinition) {
cav.addIndexedArgumentValue(POINTCUT_INDEX, pointcut);
beanDefinitions.add(beanDefinition);
}
else if (pointcut instanceof String beanName) {
RuntimeBeanReference pointcutRef = new RuntimeBeanReference(beanName);
cav.addIndexedArgumentValue(POINTCUT_INDEX, pointcutRef);
beanReferences.add(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, ParserContext parserContext) {
String elementName = parserContext.getDelegate().getLocalName(adviceElement);
return switch (elementName) {
case BEFORE -> AspectJMethodBeforeAdvice.class;
case AFTER -> AspectJAfterAdvice.class;
case AFTER_RETURNING_ELEMENT -> AspectJAfterReturningAdvice.class;
case AFTER_THROWING_ELEMENT -> AspectJAfterThrowingAdvice.class;
case AROUND -> AspectJAroundAdvice.class;
default -> throw new IllegalArgumentException("Unknown advice kind [" + elementName + "].");
};
}
/**
* Parses the supplied {@code } 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));
String pointcutBeanName = id;
if (StringUtils.hasText(pointcutBeanName)) {
parserContext.getRegistry().registerBeanDefinition(pointcutBeanName, pointcutDefinition);
}
else {
pointcutBeanName = parserContext.getReaderContext().registerWithGeneratedName(pointcutDefinition);
}
parserContext.registerComponent(
new PointcutComponentDefinition(pointcutBeanName, pointcutDefinition, expression));
}
finally {
this.parseState.pop();
}
return pointcutDefinition;
}
/**
* Parses the {@code pointcut} or {@code pointcut-ref} attributes of the supplied
* {@link Element} and add a {@code 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.
*/
@Nullable
private Object 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.
String expression = element.getAttribute(POINTCUT);
AbstractBeanDefinition pointcutDefinition = createPointcutDefinition(expression);
pointcutDefinition.setSource(parserContext.extractSource(element));
return pointcutDefinition;
}
else if (element.hasAttribute(POINTCUT_REF)) {
String pointcutRef = element.getAttribute(POINTCUT_REF);
if (!StringUtils.hasText(pointcutRef)) {
parserContext.getReaderContext().error(
"'pointcut-ref' attribute contains empty value.", element, this.parseState.snapshot());
return null;
}
return pointcutRef;
}
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.setScope(BeanDefinition.SCOPE_PROTOTYPE);
beanDefinition.setSynthetic(true);
beanDefinition.getPropertyValues().add(EXPRESSION, expression);
return beanDefinition;
}
}