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120 lines
3.5 KiB
120 lines
3.5 KiB
/*
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* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.xml.bind.annotation;
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import javax.xml.bind.ValidationEventHandler;
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import javax.xml.transform.Result;
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import javax.xml.transform.Source;
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/**
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* Converts an element (and its descendants)
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* from/to DOM (or similar) representation.
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*
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* <p>
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* Implementations of this interface will be used in conjunction with
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* {@link XmlAnyElement} annotation to map an element of XML into a representation
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* of infoset such as W3C DOM.
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*
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* <p>
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* Implementations hide how a portion of XML is converted into/from such
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* DOM-like representation, allowing JAXB providers to work with arbitrary
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* such library.
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*
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* <P>
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* This interface is intended to be implemented by library writers
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* and consumed by JAXB providers. None of those methods are intended to
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* be called from applications.
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*
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* @author Kohsuke Kawaguchi
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* @since JAXB2.0
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*/
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public interface DomHandler<ElementT,ResultT extends Result> {
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/**
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* When a JAXB provider needs to unmarshal a part of a document into an
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* infoset representation, it first calls this method to create a
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* {@link Result} object.
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*
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* <p>
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* A JAXB provider will then send a portion of the XML
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* into the given result. Such a portion always form a subtree
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* of the whole XML document rooted at an element.
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*
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* @param errorHandler
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* if any error happens between the invocation of this method
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* and the invocation of {@link #getElement(Result)}, they
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* must be reported to this handler.
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*
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* The caller must provide a non-null error handler.
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*
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* The {@link Result} object created from this method
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* may hold a reference to this error handler.
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*
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* @return
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* null if the operation fails. The error must have been reported
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* to the error handler.
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*/
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ResultT createUnmarshaller( ValidationEventHandler errorHandler );
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/**
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* Once the portion is sent to the {@link Result}. This method is called
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* by a JAXB provider to obtain the unmarshalled element representation.
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*
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* <p>
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* Multiple invocations of this method may return different objects.
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* This method can be invoked only when the whole sub-tree are fed
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* to the {@link Result} object.
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*
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* @param rt
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* The {@link Result} object created by {@link #createUnmarshaller(ValidationEventHandler)}.
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*
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* @return
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* null if the operation fails. The error must have been reported
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* to the error handler.
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*/
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ElementT getElement(ResultT rt);
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/**
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* This method is called when a JAXB provider needs to marshal an element
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* to XML.
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*
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* <p>
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* If non-null, the returned {@link Source} must contain a whole document
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* rooted at one element, which will then be weaved into a bigger document
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* that the JAXB provider is marshalling.
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*
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* @param errorHandler
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* Receives any errors happened during the process of converting
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* an element into a {@link Source}.
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*
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* The caller must provide a non-null error handler.
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*
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* @return
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* null if there was an error. The error should have been reported
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* to the handler.
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*/
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Source marshal( ElementT n, ValidationEventHandler errorHandler );
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}
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