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## org.springframework.beans.factory.xml
Class AbstractBeanDefinitionParser

    java.lang.Object
      org.springframework.beans.factory.xml.AbstractBeanDefinitionParser

All Implemented Interfaces:
  BeanDefinitionParser

Direct Known Subclasses:
  AbstractSingleBeanDefinitionParser

    public abstract class AbstractBeanDefinitionParser

extends Object
implements BeanDefinitionParser

Abstract `BeanDefinitionParser` implementation providing a number of convenience methods and a `template method` that subclasses must override to provide the actual parsing logic.

Use this `BeanDefinitionParser` implementation when you want to parse some arbitrarily complex XML into one or more `BeanDefinitions`. If you just want to parse some XML into a single `BeanDefinition`, you may wish to consider the simpler convenience extensions of this class, namely `AbstractSingleBeanDefinitionParser` and `AbstractSimpleBeanDefinitionParser`.

Since:
  2.0
Author:
  Rob Harrop, Juergen Hoeller, Rick Evans

Field Summary
`static String` | `ID_ATTRIBUTE` Constant for the id attribute

Constructor Summary
`AbstractBeanDefinitionParser()`

Method Summary
`BeanDefinition` | `parse(Element element, ParserContext parserContext)` Parse the specified `Element` and register the resulting `BeanDefinition(s)` with the `ParserContext.getRegistry()` BeanDefinitionRegistry} embedded in the supplied `ParserContext`.
`protected abstract AbstractBeanDefinition` | `parseInternal(Element element, ParserContext parserContext)` Central template method to actually parse the supplied `Element` into one or more `BeanDefinitions`.
`protected void` | `postProcessComponentDefinition(BeanComponentDefinition componentDefinition)` Hook method called after the primary parsing of a `BeanComponentDefinition` but before the `BeanComponentDefinition` has been registered with a `BeanDefinitionRegistry`.
`protected void` | `registerBeanDefinition(BeanDefinitionHolder definition, BeanDefinitionRegistry registry)` Register the supplied `bean` with the supplied `registry`.
`protected String` | `resolveId(Element element, AbstractBeanDefinition definition, ParserContext parserContext)` Resolve the ID for the supplied `BeanDefinition`.
`protected boolean` | `shouldFireEvents()` Controls whether this parser is supposed to fire a `BeanComponentDefinition` event after parsing the bean definition.
`protected boolean` | `shouldGenerateId()` Should an ID be generated instead of read from the passed in `Element`?
`protected boolean` | `shouldGenerateIdAsFallback()` Should an ID be generated instead if the passed in `Element` does not specify an "id" attribute explicitly?

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### ID_ATTRIBUTE

    public static final String ID_ATTRIBUTE

  Constant for the id attribute

  See Also:
    Constant Field Values

Constructor Detail

### AbstractBeanDefinitionParser

    public AbstractBeanDefinitionParser()

Method Detail

### parse

    public final BeanDefinition parse(Element element,
                                      ParserContext parserContext)

  Description copied from interface: `BeanDefinitionParser`
  Parse the specified `Element` and register the resulting `BeanDefinition(s)` with the `ParserContext.getRegistry()` BeanDefinitionRegistry} embedded in the supplied `ParserContext`.

  Implementations must return the primary `BeanDefinition` that results from the parse if they will ever be used in a nested fashion (for example as an inner tag in a `<property/>` tag). Implementations may return `null` if they will not be used in a nested fashion.

  Specified by:
    `parse` in interface `BeanDefinitionParser`
  Parameters:
    `element` - the element that is to be parsed into one or more `BeanDefinitions`
    `parserContext` - the object encapsulating the current state of the parsing process; provides access to a `BeanDefinitionRegistry`
  Returns:
    the primary `BeanDefinition`

### resolveId

    protected String resolveId(Element element,
                               AbstractBeanDefinition definition,
                               ParserContext parserContext)
                        throws BeanDefinitionStoreException

  Resolve the ID for the supplied `BeanDefinition`.

  When using `generation`, a name is generated automatically. Otherwise, the ID is extracted from the "id" attribute, potentially with a `fallback` to a generated id.

  Parameters:
    `element` - the element that the bean definition has been built from
    `definition` - the bean definition to be registered
    `parserContext` - the object encapsulating the current state of the parsing process; provides access to a `BeanDefinitionRegistry`
  Returns:
    the resolved id
  Throws:
    `BeanDefinitionStoreException` - if no unique name could be generated for the given bean definition

### registerBeanDefinition

    protected void registerBeanDefinition(BeanDefinitionHolder definition,
                                          BeanDefinitionRegistry registry)

  Register the supplied `bean` with the supplied `registry`.

  Subclasses can override this method to control whether or not the supplied `bean` is actually even registered, or to register even more beans.

  The default implementation registers the supplied `bean` with the supplied `registry` only if the `isNested` parameter is `false`, because one typically does not want inner beans to be registered as top level beans.

  Parameters:
    `definition` - the bean definition to be registered
    `registry` - the registry that the bean is to be registered with
  See Also:
    `BeanDefinitionReaderUtils.registerBeanDefinition(BeanDefinitionHolder, BeanDefinitionRegistry)`

### parseInternal

    protected abstract AbstractBeanDefinition parseInternal(Element element,
                                                            ParserContext parserContext)

  Central template method to actually parse the supplied `Element` into one or more `BeanDefinitions`.

  Parameters:
    `element` - the element that is to be parsed into one or more `BeanDefinitions`
    `parserContext` - the object encapsulating the current state of the parsing process; provides access to a `BeanDefinitionRegistry`
  Returns:
    the primary `BeanDefinition` resulting from the parsing of the supplied `Element`
  See Also:
    `parse(org.w3c.dom.Element, ParserContext)`, `postProcessComponentDefinition(org.springframework.beans.factory.parsing.BeanComponentDefinition)`

### shouldGenerateId

    protected boolean shouldGenerateId()

  Should an ID be generated instead of read from the passed in `Element`?

  Disabled by default; subclasses can override this to enable ID generation. Note that this flag is about always generating an ID; the parser won't even check for an "id" attribute in this case.

  Returns:
    whether the parser should always generate an id

### shouldGenerateIdAsFallback

    protected boolean shouldGenerateIdAsFallback()

  Should an ID be generated instead if the passed in `Element` does not specify an "id" attribute explicitly?

  Disabled by default; subclasses can override this to enable ID generation as fallback: The parser will first check for an "id" attribute in this case, only falling back to a generated ID if no value was specified.

  Returns:
    whether the parser should generate an id if no id was specified

### shouldFireEvents

    protected boolean shouldFireEvents()

  Controls whether this parser is supposed to fire a `BeanComponentDefinition` event after parsing the bean definition.

  This implementation returns `true` by default; that is, an event will be fired when a bean definition has been completely parsed. Override this to return `false` in order to suppress the event.

  Returns:
    `true` in order to fire a component registration event after parsing the bean definition; `false` to suppress the event
  See Also:
    `postProcessComponentDefinition(org.springframework.beans.factory.parsing.BeanComponentDefinition)`, `ReaderContext.fireComponentRegistered(org.springframework.beans.factory.parsing.ComponentDefinition)`

### postProcessComponentDefinition

    protected void postProcessComponentDefinition(BeanComponentDefinition componentDefinition)

  Hook method called after the primary parsing of a `BeanComponentDefinition` but before the `BeanComponentDefinition` has been registered with a `BeanDefinitionRegistry`.

  Derived classes can override this method to supply any custom logic that is to be executed after all the parsing is finished.

  The default implementation is a no-op.

  Parameters:
    `componentDefinition` - the `BeanComponentDefinition` that is to be processed

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