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package javax.xml.bind.annotation;

import javax.xml.bind.ValidationEventHandler;
import javax.xml.transform.Result;
import javax.xml.transform.Source;

/**
 * Converts an element (and its descendants)
 * from/to DOM (or similar) representation.
 *
 * 

* Implementations of this interface will be used in conjunction with * {@link XmlAnyElement} annotation to map an element of XML into a representation * of infoset such as W3C DOM. * *

* Implementations hide how a portion of XML is converted into/from such * DOM-like representation, allowing JAXB providers to work with arbitrary * such library. * *

* This interface is intended to be implemented by library writers * and consumed by JAXB providers. None of those methods are intended to * be called from applications. * * @author Kohsuke Kawaguchi * @since 1.6, JAXB 2.0 */ public interface DomHandler { /** * When a JAXB provider needs to unmarshal a part of a document into an * infoset representation, it first calls this method to create a * {@link Result} object. * *

* A JAXB provider will then send a portion of the XML * into the given result. Such a portion always form a subtree * of the whole XML document rooted at an element. * * @param errorHandler * if any error happens between the invocation of this method * and the invocation of {@link #getElement(Result)}, they * must be reported to this handler. * * The caller must provide a non-null error handler. * * The {@link Result} object created from this method * may hold a reference to this error handler. * * @return * null if the operation fails. The error must have been reported * to the error handler. */ ResultT createUnmarshaller( ValidationEventHandler errorHandler ); /** * Once the portion is sent to the {@link Result}. This method is called * by a JAXB provider to obtain the unmarshalled element representation. * *

* Multiple invocations of this method may return different objects. * This method can be invoked only when the whole sub-tree are fed * to the {@link Result} object. * * @param rt * The {@link Result} object created by {@link #createUnmarshaller(ValidationEventHandler)}. * * @return * null if the operation fails. The error must have been reported * to the error handler. */ ElementT getElement(ResultT rt); /** * This method is called when a JAXB provider needs to marshal an element * to XML. * *

* If non-null, the returned {@link Source} must contain a whole document * rooted at one element, which will then be weaved into a bigger document * that the JAXB provider is marshalling. * * @param errorHandler * Receives any errors happened during the process of converting * an element into a {@link Source}. * * The caller must provide a non-null error handler. * * @return * null if there was an error. The error should have been reported * to the handler. */ Source marshal( ElementT n, ValidationEventHandler errorHandler ); }





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