/**
* Convenience method to update a template bean definition from overriding XML data. If <code>
* overrides</code> contains attribute <code>attribute</code>, transfer that attribute onto <code>
* template</code>, overwriting the default value.
*/
public static String overrideAttribute(
String attribute, BeanDefinition template, Element overrides) {
String value = (String) template.getAttribute(attribute);
if (overrides.hasAttribute(attribute)) {
value = overrides.getAttribute(attribute);
template.setAttribute(attribute, value);
}
return value;
}
/**
* Load the template BeanDefinition and call {@link #transform(ConfigurableListableBeanFactory,
* BeanDefinition, Element, ParserContext)} to apply runtime configuration value to it. <code>
* builder</code> will be configured to instantiate the bean in the Spring context that we are
* parsing.
*
* <p>During parsing, an instance of {@link
* TemplateBeanDefinitionParser.TemplateComponentDefinition} is pushed onto <code>ParserContext
* </code> so that nested tags can access the enclosing template configuration with a call to
* {@link #findEnclosingTemplateFactory(ParserContext)}. Subclasses can override {@link
* #newComponentDefinition(String, Object, DefaultListableBeanFactory)} to provide a subclass of
* {@link TemplateBeanDefinitionParser.TemplateComponentDefinition} to the parser context if
* necessary.
*/
@Override
protected final void doParse(
Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
// if we have multiple nested bean definitions, we only parse the template factory
// once. this allows configuration changes made by enclosing bean parsers to be inherited
// by contained beans, which is quite useful.
DefaultListableBeanFactory templateFactory = findEnclosingTemplateFactory(parserContext);
TemplateComponentDefinition tcd = null;
if (templateFactory == null) {
// no nesting -- load the template XML configuration from the classpath.
final BeanFactory parentFactory = (BeanFactory) parserContext.getRegistry();
templateFactory = new DefaultListableBeanFactory(parentFactory);
// load template bean definitions
DefaultResourceLoader loader = new DefaultResourceLoader();
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(templateFactory);
reader.setResourceLoader(loader);
reader.setEntityResolver(new ResourceEntityResolver(loader));
reader.loadBeanDefinitions(templateResource);
// propagate factory post-processors from the source factory into the template
// factory.
BeanDefinition ppChain = new RootBeanDefinition(ChainingBeanFactoryPostProcessor.class);
ppChain.getPropertyValues().addPropertyValue("targetFactory", templateFactory);
parserContext.getReaderContext().registerWithGeneratedName(ppChain);
// push component definition onto the parser stack for the benefit of
// nested bean definitions.
tcd =
newComponentDefinition(
element.getNodeName(), parserContext.extractSource(element), templateFactory);
parserContext.pushContainingComponent(tcd);
}
try {
// allow subclasses to apply overrides to the template bean definition.
BeanDefinition def = templateFactory.getBeanDefinition(templateId);
transform(templateFactory, def, element, parserContext);
// setup our factory bean to instantiate the modified bean definition upon request.
builder.addPropertyValue("beanFactory", templateFactory);
builder.addPropertyValue("beanName", templateId);
builder.getRawBeanDefinition().setAttribute("id", def.getAttribute("id"));
} finally {
if (tcd != null) parserContext.popContainingComponent();
}
}
/** Determine whether the given bean definition indicates a full @Configuration class. */
public static boolean isFullConfigurationClass(BeanDefinition beanDef) {
return CONFIGURATION_CLASS_FULL.equals(beanDef.getAttribute(CONFIGURATION_CLASS_ATTRIBUTE));
}