org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader#processBeanDefinition
processBeanDefinition(ele, delegate);
org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader#processBeanDefinition
protected void processBeanDefinition(Element ele, BeanDefinitionParserDelegate delegate) {
//第一步: 解析bean元素
BeanDefinitionHolder bdHolder = delegate.parseBeanDefinitionElement(ele);
//
if (bdHolder != null) {
bdHolder = delegate.decorateBeanDefinitionIfRequired(ele, bdHolder);
try {
// Register the final decorated instance.
BeanDefinitionReaderUtils.registerBeanDefinition(bdHolder, getReaderContext().getRegistry());
}
catch (BeanDefinitionStoreException ex) {
getReaderContext().error("Failed to register bean definition with name '" +
bdHolder.getBeanName() + "'", ele, ex);
}
// Send registration event.
getReaderContext().fireComponentRegistered(new BeanComponentDefinition(bdHolder));
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseBeanDefinitionElement(org.w3c.dom.Element, org.springframework.beans.factory.config.BeanDefinition)
public BeanDefinitionHolder parseBeanDefinitionElement(Element ele, @Nullable BeanDefinition containingBean) {
// 第一步: 获取id的属性
String id = ele.getAttribute(ID_ATTRIBUTE);
// 第二步: 获取name属性
String nameAttr = ele.getAttribute(NAME_ATTRIBUTE);
// 第三步: 分割name的属性
List<String> aliases = new ArrayList<>();
if (StringUtils.hasLength(nameAttr)) {
String[] nameArr = StringUtils.tokenizeToStringArray(nameAttr, MULTI_VALUE_ATTRIBUTE_DELIMITERS);
aliases.addAll(Arrays.asList(nameArr));
}
String beanName = id;
if (!StringUtils.hasText(beanName) && !aliases.isEmpty()) {
beanName = aliases.remove(0);
if (logger.isTraceEnabled()) {
logger.trace("No XML 'id' specified - using '" + beanName +
"' as bean name and " + aliases + " as aliases");
}
}
if (containingBean == null) {
// 检查名字是否唯一
checkNameUniqueness(beanName, aliases, ele);
}
// 解析bean元素
AbstractBeanDefinition beanDefinition = parseBeanDefinitionElement(ele, beanName, containingBean);
if (beanDefinition != null) {
if (!StringUtils.hasText(beanName)) {
try {
if (containingBean != null) {
beanName = BeanDefinitionReaderUtils.generateBeanName(
beanDefinition, this.readerContext.getRegistry(), true);
}
else {
beanName = this.readerContext.generateBeanName(beanDefinition);
// Register an alias for the plain bean class name, if still possible,
// if the generator returned the class name plus a suffix.
// This is expected for Spring 1.2/2.0 backwards compatibility.
String beanClassName = beanDefinition.getBeanClassName();
if (beanClassName != null &&
beanName.startsWith(beanClassName) && beanName.length() > beanClassName.length() &&
!this.readerContext.getRegistry().isBeanNameInUse(beanClassName)) {
aliases.add(beanClassName);
}
}
if (logger.isTraceEnabled()) {
logger.trace("Neither XML 'id' nor 'name' specified - " +
"using generated bean name [" + beanName + "]");
}
}
catch (Exception ex) {
error(ex.getMessage(), ele);
return null;
}
}
String[] aliasesArray = StringUtils.toStringArray(aliases);
return new BeanDefinitionHolder(beanDefinition, beanName, aliasesArray);
}
return null;
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseBeanDefinitionElement(org.w3c.dom.Element, java.lang.String, org.springframework.beans.factory.config.BeanDefinition)
AbstractBeanDefinition beanDefinition = parseBeanDefinitionElement(ele, beanName, containingBean);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseBeanDefinitionElement(org.w3c.dom.Element, java.lang.String, org.springframework.beans.factory.config.BeanDefinition)
public AbstractBeanDefinition parseBeanDefinitionElement(
Element ele, String beanName, @Nullable BeanDefinition containingBean) {
this.parseState.push(new BeanEntry(beanName));
String className = null;
if (ele.hasAttribute(CLASS_ATTRIBUTE)) {
className = ele.getAttribute(CLASS_ATTRIBUTE).trim();
}
String parent = null;
if (ele.hasAttribute(PARENT_ATTRIBUTE)) {
parent = ele.getAttribute(PARENT_ATTRIBUTE);
}
try {
// 第一步: 获取类中的信息
AbstractBeanDefinition bd = createBeanDefinition(className, parent);
// 第二步: 解析元素标签中定义的值
parseBeanDefinitionAttributes(ele, beanName, containingBean, bd);
// 第三步: 设置描叙信息
bd.setDescription(DomUtils.getChildElementValueByTagName(ele, DESCRIPTION_ELEMENT));
// 第四步: 解析数据信息
parseMetaElements(ele, bd);
// 第五步: 解析重载的元素
parseLookupOverrideSubElements(ele, bd.getMethodOverrides());
// 第六步: 替换方法或则子元素
parseReplacedMethodSubElements(ele, bd.getMethodOverrides());
// 第七步: 解析构造参数节点
parseConstructorArgElements(ele, bd);
// 第八步: 解析属性
parsePropertyElements(ele, bd);
// 第九步: 接续Qualifier
parseQualifierElements(ele, bd);
bd.setResource(this.readerContext.getResource());
bd.setSource(extractSource(ele));
return bd;
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseBeanDefinitionAttributes
parseBeanDefinitionAttributes(ele, beanName, containingBean, bd);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseBeanDefinitionAttributes
/**
* Apply the attributes of the given bean element to the given bean * definition.
* @param ele bean declaration element
* @param beanName bean name
* @param containingBean containing bean definition
* @return a bean definition initialized according to the bean element attributes
*/
public AbstractBeanDefinition parseBeanDefinitionAttributes(Element ele, String beanName,
@Nullable BeanDefinition containingBean, AbstractBeanDefinition bd) {
// 是否设备为单例模式singleton
if (ele.hasAttribute(SINGLETON_ATTRIBUTE)) {
error("Old 1.x 'singleton' attribute in use - upgrade to 'scope' declaration", ele);
}
// 域scope
else if (ele.hasAttribute(SCOPE_ATTRIBUTE)) {
bd.setScope(ele.getAttribute(SCOPE_ATTRIBUTE));
}
else if (containingBean != null) {
// Take default from containing bean in case of an inner bean definition.
bd.setScope(containingBean.getScope());
}
// 抽象abstract
if (ele.hasAttribute(ABSTRACT_ATTRIBUTE)) {
bd.setAbstract(TRUE_VALUE.equals(ele.getAttribute(ABSTRACT_ATTRIBUTE)));
}
// 懒加载lazy-init
String lazyInit = ele.getAttribute(LAZY_INIT_ATTRIBUTE);
if (isDefaultValue(lazyInit)) {
lazyInit = this.defaults.getLazyInit();
}
bd.setLazyInit(TRUE_VALUE.equals(lazyInit));
String autowire = ele.getAttribute(AUTOWIRE_ATTRIBUTE);
bd.setAutowireMode(getAutowireMode(autowire));
// autowire
if (ele.hasAttribute(DEPENDS_ON_ATTRIBUTE)) {
// depends-on
String dependsOn = ele.getAttribute(DEPENDS_ON_ATTRIBUTE);
bd.setDependsOn(StringUtils.tokenizeToStringArray(dependsOn, MULTI_VALUE_ATTRIBUTE_DELIMITERS));
}
// autowire-candidate
String autowireCandidate = ele.getAttribute(AUTOWIRE_CANDIDATE_ATTRIBUTE);
if (isDefaultValue(autowireCandidate)) {
String candidatePattern = this.defaults.getAutowireCandidates();
if (candidatePattern != null) {
String[] patterns = StringUtils.commaDelimitedListToStringArray(candidatePattern);
bd.setAutowireCandidate(PatternMatchUtils.simpleMatch(patterns, beanName));
}
}
else {
bd.setAutowireCandidate(TRUE_VALUE.equals(autowireCandidate));
}
// primary
if (ele.hasAttribute(PRIMARY_ATTRIBUTE)) {
bd.setPrimary(TRUE_VALUE.equals(ele.getAttribute(PRIMARY_ATTRIBUTE)));
}
// init-method 初始化方法
if (ele.hasAttribute(INIT_METHOD_ATTRIBUTE)) {
String initMethodName = ele.getAttribute(INIT_METHOD_ATTRIBUTE);
bd.setInitMethodName(initMethodName);
}
else if (this.defaults.getInitMethod() != null) {
bd.setInitMethodName(this.defaults.getInitMethod());
bd.setEnforceInitMethod(false);
}
// destroy-method
if (ele.hasAttribute(DESTROY_METHOD_ATTRIBUTE)) {
String destroyMethodName = ele.getAttribute(DESTROY_METHOD_ATTRIBUTE);
bd.setDestroyMethodName(destroyMethodName);
}
else if (this.defaults.getDestroyMethod() != null) {
bd.setDestroyMethodName(this.defaults.getDestroyMethod());
bd.setEnforceDestroyMethod(false);
}
// factory-method
if (ele.hasAttribute(FACTORY_METHOD_ATTRIBUTE)) {
bd.setFactoryMethodName(ele.getAttribute(FACTORY_METHOD_ATTRIBUTE));
}
// factory-bean
if (ele.hasAttribute(FACTORY_BEAN_ATTRIBUTE)) {
bd.setFactoryBeanName(ele.getAttribute(FACTORY_BEAN_ATTRIBUTE));
}
return bd;
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseMetaElements
// 第四步: 解析数据信息
parseMetaElements(ele, bd);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseMetaElements
public void parseMetaElements(Element ele, BeanMetadataAttributeAccessor attributeAccessor) {
// 第一步: 获取所有子节点
NodeList nl = ele.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
// meta
if (isCandidateElement(node) && nodeNameEquals(node, META_ELEMENT)) {
Element metaElement = (Element) node;
// key value
String key = metaElement.getAttribute(KEY_ATTRIBUTE);
String value = metaElement.getAttribute(VALUE_ATTRIBUTE);
BeanMetadataAttribute attribute = new BeanMetadataAttribute(key, value);
attribute.setSource(extractSource(metaElement));
attributeAccessor.addMetadataAttribute(attribute);
}
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseReplacedMethodSubElements
// 第六步: 替换方法或则子元素
parseReplacedMethodSubElements(ele, bd.getMethodOverrides());
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseReplacedMethodSubElements
public void parseReplacedMethodSubElements(Element beanEle, MethodOverrides overrides) {
NodeList nl = beanEle.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
//replaced-method
if (isCandidateElement(node) && nodeNameEquals(node, REPLACED_METHOD_ELEMENT)) {
Element replacedMethodEle = (Element) node;
//
String name = replacedMethodEle.getAttribute(NAME_ATTRIBUTE);
String callback = replacedMethodEle.getAttribute(REPLACER_ATTRIBUTE);
ReplaceOverride replaceOverride = new ReplaceOverride(name, callback);
// Look for arg-type match elements.
List<Element> argTypeEles = DomUtils.getChildElementsByTagName(replacedMethodEle, ARG_TYPE_ELEMENT);
for (Element argTypeEle : argTypeEles) {
String match = argTypeEle.getAttribute(ARG_TYPE_MATCH_ATTRIBUTE);
match = (StringUtils.hasText(match) ? match : DomUtils.getTextValue(argTypeEle));
if (StringUtils.hasText(match)) {
replaceOverride.addTypeIdentifier(match);
}
}
replaceOverride.setSource(extractSource(replacedMethodEle));
overrides.addOverride(replaceOverride);
}
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseConstructorArgElements
// 第七步: 解析构造参数节点
parseConstructorArgElements(ele, bd);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseConstructorArgElements
public void parseConstructorArgElements(Element beanEle, BeanDefinition bd) {
NodeList nl = beanEle.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
if (isCandidateElement(node) && nodeNameEquals(node, CONSTRUCTOR_ARG_ELEMENT)) {
parseConstructorArgElement((Element) node, bd);
}
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseConstructorArgElement
/**
* Parse a constructor-arg element.
*/
public void parseConstructorArgElement(Element ele, BeanDefinition bd) {
String indexAttr = ele.getAttribute(INDEX_ATTRIBUTE);
String typeAttr = ele.getAttribute(TYPE_ATTRIBUTE);
String nameAttr = ele.getAttribute(NAME_ATTRIBUTE);
if (StringUtils.hasLength(indexAttr)) {
try {
int index = Integer.parseInt(indexAttr);
if (index < 0) {
error("'index' cannot be lower than 0", ele);
}
else {
try {
this.parseState.push(new ConstructorArgumentEntry(index));
Object value = parsePropertyValue(ele, bd, null);
ConstructorArgumentValues.ValueHolder valueHolder = new ConstructorArgumentValues.ValueHolder(value);
if (StringUtils.hasLength(typeAttr)) {
valueHolder.setType(typeAttr);
}
if (StringUtils.hasLength(nameAttr)) {
valueHolder.setName(nameAttr);
}
valueHolder.setSource(extractSource(ele));
if (bd.getConstructorArgumentValues().hasIndexedArgumentValue(index)) {
error("Ambiguous constructor-arg entries for index " + index, ele);
}
else {
bd.getConstructorArgumentValues().addIndexedArgumentValue(index, valueHolder);
}
}
finally {
this.parseState.pop();
}
}
}
catch (NumberFormatException ex) {
error("Attribute 'index' of tag 'constructor-arg' must be an integer", ele);
}
}
else {
try {
this.parseState.push(new ConstructorArgumentEntry());
Object value = parsePropertyValue(ele, bd, null);
ConstructorArgumentValues.ValueHolder valueHolder = new ConstructorArgumentValues.ValueHolder(value);
if (StringUtils.hasLength(typeAttr)) {
valueHolder.setType(typeAttr);
}
if (StringUtils.hasLength(nameAttr)) {
valueHolder.setName(nameAttr);
}
valueHolder.setSource(extractSource(ele));
bd.getConstructorArgumentValues().addGenericArgumentValue(valueHolder);
}
finally {
this.parseState.pop();
}
}
}
// 第八步: 解析属性
parsePropertyElements(ele, bd);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parsePropertyElements
public void parsePropertyElements(Element beanEle, BeanDefinition bd) {
NodeList nl = beanEle.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
if (isCandidateElement(node) && nodeNameEquals(node, PROPERTY_ELEMENT)) {
parsePropertyElement((Element) node, bd);
}
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parsePropertyElement
/**
* Parse a property element.
*/
public void parsePropertyElement(Element ele, BeanDefinition bd) {
String propertyName = ele.getAttribute(NAME_ATTRIBUTE);
if (!StringUtils.hasLength(propertyName)) {
error("Tag 'property' must have a 'name' attribute", ele);
return;
}
this.parseState.push(new PropertyEntry(propertyName));
try {
// 这段源码应该在编译时候就应该报错、不应该在这里检测。
if (bd.getPropertyValues().contains(propertyName)) {
error("Multiple 'property' definitions for property '" + propertyName + "'", ele);
return;
}
// 解析属性
Object val = parsePropertyValue(ele, bd, propertyName);
// 根据property的名字和值创建property实例
PropertyValue pv = new PropertyValue(propertyName, val);
// 解析<property>元素中的属性
parseMetaElements(ele, pv);
pv.setSource(extractSource(ele));
bd.getPropertyValues().addPropertyValue(pv);
}
finally {
this.parseState.pop();
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parsePropertyValue
Object val = parsePropertyValue(ele, bd, propertyName);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parsePropertyValue
/**
* Get the value of a property element. May be a list etc.
* Also used for constructor arguments, "propertyName" being null in this case.
*/
@Nullable
public Object parsePropertyValue(Element ele, BeanDefinition bd, @Nullable String propertyName) {
String elementName = (propertyName != null ?
"<property> element for property '" + propertyName + "'" :
"<constructor-arg> element");
// Should only have one child element: ref, value, list, etc.
NodeList nl = ele.getChildNodes();
Element subElement = null;
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
if (node instanceof Element && !nodeNameEquals(node, DESCRIPTION_ELEMENT) &&
!nodeNameEquals(node, META_ELEMENT)) {
// Child element is what we're looking for.
if (subElement != null) {
error(elementName + " must not contain more than one sub-element", ele);
}
else {
subElement = (Element) node;
}
}
}
// 检测当前元素上面时候既含义ref,value标签。
boolean hasRefAttribute = ele.hasAttribute(REF_ATTRIBUTE);
boolean hasValueAttribute = ele.hasAttribute(VALUE_ATTRIBUTE);
if ((hasRefAttribute && hasValueAttribute) ||
((hasRefAttribute || hasValueAttribute) && subElement != null)) {
error(elementName +
" is only allowed to contain either 'ref' attribute OR 'value' attribute OR sub-element", ele);
}
if (hasRefAttribute) {
// 如果ref设置了标签但是没有值则直接报错。
String refName = ele.getAttribute(REF_ATTRIBUTE);
if (!StringUtils.hasText(refName)) {
error(elementName + " contains empty 'ref' attribute", ele);
}
// 用实体类保存bean里面的信息 指向运行时所依赖对象 的引用
RuntimeBeanReference ref = new RuntimeBeanReference(refName);
// 设置这个ref的数据对象是被当前的property对象所引用
ref.setSource(extractSource(ele));
return ref;
}
//如果属性是value，创建一个value的数据对象TypedStringValue，这个对象封装了value信息
else if (hasValueAttribute) {
// 持有String类型值的对象 [这里一般我们都配class的路径，因为不实例化，所以这样处理]
TypedStringValue valueHolder = new TypedStringValue(ele.getAttribute(VALUE_ATTRIBUTE));
valueHolder.setSource(extractSource(ele));
return valueHolder;
}
//如果当前<property>元素还有子元素
else if (subElement != null) {
return parsePropertySubElement(subElement, bd);
}
else {
// 既不是"ref"又不是"value"，报错
// Neither child element nor "ref" or "value" attribute found.
error(elementName + " must specify a ref or value", ele);
return null;
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseQualifierElements
parseQualifierElements(ele, bd);
org/springframework/beans/factory/xml/BeanDefinitionParserDelegate.java:747
/**
* Parse qualifier sub-elements of the given bean element.
*/
public void parseQualifierElements(Element beanEle, AbstractBeanDefinition bd) {
NodeList nl = beanEle.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
if (isCandidateElement(node) && nodeNameEquals(node, QUALIFIER_ELEMENT)) {
parseQualifierElement((Element) node, bd);
}
}
}
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#parseQualifierElement
/**
* Parse a qualifier element.
*/
public void parseQualifierElement(Element ele, AbstractBeanDefinition bd) {
//第一步: 解析type属性
String typeName = ele.getAttribute(TYPE_ATTRIBUTE);
if (!StringUtils.hasLength(typeName)) {
error("Tag 'qualifier' must have a 'type' attribute", ele);
return;
}
this.parseState.push(new QualifierEntry(typeName));
try {
AutowireCandidateQualifier qualifier = new AutowireCandidateQualifier(typeName);
//第二步 解析value属性值
qualifier.setSource(extractSource(ele));
String value = ele.getAttribute(VALUE_ATTRIBUTE);
if (StringUtils.hasLength(value)) {
qualifier.setAttribute(AutowireCandidateQualifier.VALUE_KEY, value);
}
NodeList nl = ele.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
//第三步 属性值是attribute
if (isCandidateElement(node) && nodeNameEquals(node, QUALIFIER_ATTRIBUTE_ELEMENT)) {
Element attributeEle = (Element) node;
//获得key值
String attributeName = attributeEle.getAttribute(KEY_ATTRIBUTE);
//获得value值
String attributeValue = attributeEle.getAttribute(VALUE_ATTRIBUTE);
if (StringUtils.hasLength(attributeName) && StringUtils.hasLength(attributeValue)) {
BeanMetadataAttribute attribute = new BeanMetadataAttribute(attributeName, attributeValue);
attribute.setSource(extractSource(attributeEle));
qualifier.addMetadataAttribute(attribute);
}
else {
error("Qualifier 'attribute' tag must have a 'name' and 'value'", attributeEle);
return;
}
}
}
bd.addQualifier(qualifier);
}
finally {
this.parseState.pop();
}
}
org.springframework.beans.factory.support.BeanDefinitionReaderUtils#generateBeanName(org.springframework.beans.factory.config.BeanDefinition, org.springframework.beans.factory.support.BeanDefinitionRegistry, boolean)
beanName = BeanDefinitionReaderUtils.generateBeanName(
beanDefinition, this.readerContext.getRegistry(), true);
/**
* Generate a bean name for the given bean definition, unique within the
* given bean factory.
* @param definition the bean definition to generate a bean name for
* @param registry the bean factory that the definition is going to be
* registered with (to check for existing bean names)
* @param isInnerBean whether the given bean definition will be registered
* as inner bean or as top-level bean (allowing for special name generation
* for inner beans versus top-level beans)
* @return the generated bean name
* @throws BeanDefinitionStoreException if no unique name can be generated
* for the given bean definition
*/
public static String generateBeanName(
BeanDefinition definition, BeanDefinitionRegistry registry, boolean isInnerBean)
throws BeanDefinitionStoreException {
//自动生成的名字是className
String generatedBeanName = definition.getBeanClassName();
if (generatedBeanName == null) {
// 如果这个类有父类
if (definition.getParentName() != null) {
// 自动生成的名字是父类的名字+$child
generatedBeanName = definition.getParentName() + "$child";
}
else if (definition.getFactoryBeanName() != null) {
// bean定义的factoryName为空，beanName值就是beanFactory的值+$created
generatedBeanName = definition.getFactoryBeanName() + "$created";
}
}
if (!StringUtils.hasText(generatedBeanName)) {
throw new BeanDefinitionStoreException("Unnamed bean definition specifies neither " +
"'class' nor 'parent' nor 'factory-bean' - can't generate bean name");
}
// 如果是内部bean
String id = generatedBeanName;
if (isInnerBean) {
// Inner bean: generate identity hashcode suffix. GENERATED_BEAN_NAME_SEPARATOR = #
id = generatedBeanName + GENERATED_BEAN_NAME_SEPARATOR + ObjectUtils.getIdentityHexString(definition);
}
else {
// Top-level bean: use plain class name with unique suffix if necessary.
return uniqueBeanName(generatedBeanName, registry);
}
return id;
}
org.springframework.beans.factory.xml.XmlReaderContext#generateBeanName
beanName = this.readerContext.generateBeanName(beanDefinition);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#decorateBeanDefinitionIfRequired(org.w3c.dom.Element, org.springframework.beans.factory.config.BeanDefinitionHolder)
bdHolder = delegate.decorateBeanDefinitionIfRequired(ele, bdHolder);
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate#decorateIfRequired
public BeanDefinitionHolder decorateIfRequired(
Node node, BeanDefinitionHolder originalDef, @Nullable BeanDefinition containingBd) {
// 不是默认的命名空间 http://www.springframework.org/schema/beans
String namespaceUri = getNamespaceURI(node);
// 解析NamespaceHandler
if (namespaceUri != null && !isDefaultNamespace(namespaceUri)) {
NamespaceHandler handler = this.readerContext.getNamespaceHandlerResolver().resolve(namespaceUri);
if (handler != null) {
BeanDefinitionHolder decorated =
handler.decorate(node, originalDef, new ParserContext(this.readerContext, this, containingBd));
if (decorated != null) {
return decorated;
}
}
else if (namespaceUri.startsWith("http://www.springframework.org/")) {
error("Unable to locate Spring NamespaceHandler for XML schema namespace [" + namespaceUri + "]", node);
}
else {
// A custom namespace, not to be handled by Spring - maybe "xml:...".
if (logger.isDebugEnabled()) {
logger.debug("No Spring NamespaceHandler found for XML schema namespace [" + namespaceUri + "]");
}
}
}
return originalDef;
}
今天的文章第七章 bean解析三分享到此就结束了，感谢您的阅读。
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