UnmarshallerHandler (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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javax.xml.bind
Interface UnmarshallerHandler

All Superinterfaces:: ContentHandler

public interface UnmarshallerHandler
extends ContentHandler
extends ContentHandler

Unmarshaller implemented as SAX ContentHandler.

Applications can use this interface to use their JAXB provider as a component in an XML pipeline. For example:

       JAXBContext context = JAXBContext.newInstance( "org.acme.foo" );

       Unmarshaller unmarshaller = context.createUnmarshaller();
 
       UnmarshallerHandler unmarshallerHandler = unmarshaller.getUnmarshallerHandler();

       SAXParserFactory spf = SAXParserFactory.newInstance();
       spf.setNamespaceAware( true );
 
       XMLReader xmlReader = spf.newSAXParser().getXMLReader();
       xmlReader.setContentHandler( unmarshallerHandler );
       xmlReader.parse(new InputSource( new FileInputStream( XML_FILE ) ) );

       MyObject myObject= (MyObject)unmarshallerHandler.getResult();

This interface is reusable: even if the user fails to unmarshal an object, s/he can still start a new round of unmarshalling.

Since:: JAXB1.0
See Also:: Unmarshaller.getUnmarshallerHandler()

Method Summary

Object getResult()
Obtains the unmarshalled result.

Methods inherited from interface org.xml.sax.ContentHandler

characters, endDocument, endElement, endPrefixMapping, ignorableWhitespace, processingInstruction, setDocumentLocator, skippedEntity, startDocument, startElement, startPrefixMapping

Method Summary
`Object`	`getResult()` Obtains the unmarshalled result.

Methods inherited from interface org.xml.sax.ContentHandler
`characters, endDocument, endElement, endPrefixMapping, ignorableWhitespace, processingInstruction, setDocumentLocator, skippedEntity, startDocument, startElement, startPrefixMapping`

Method Detail

getResult

Object getResult()
                 throws JAXBException,
                        IllegalStateException

Obtains the unmarshalled result. This method can be called only after this handler receives the endDocument SAX event.

Returns:: always return a non-null valid object which was unmarshalled.
Throws:: IllegalStateException - if this method is called before this handler receives the endDocument event.; JAXBException - if there is any unmarshalling error. Note that the implementation is allowed to throw SAXException during the parsing when it finds an error.