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package javax.xml.bind.annotation;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
/**
* {@link DomHandler} implementation for W3C DOM (<code>org.w3c.dom</code> package.)
*
* @author Kohsuke Kawaguchi
* @since JAXB2.0
*/
public class W3CDomHandler implements DomHandler<Element,DOMResult> {
private DocumentBuilder builder;
/**
* Default constructor.
*
* It is up to a JAXB provider to decide which DOM implementation
* to use or how that is configured.
*/
public W3CDomHandler() {
this.builder = null;
}
/**
* Constructor that allows applications to specify which DOM implementation
* to be used.
*
* @param builder
* must not be null. JAXB uses this {@link DocumentBuilder} to create
* a new element.
*/
public W3CDomHandler(DocumentBuilder builder) {
if(builder==null)
throw new IllegalArgumentException();
this.builder = builder;
}
public DocumentBuilder getBuilder() {
return builder;
}
public void setBuilder(DocumentBuilder builder) {
this.builder = builder;
}
public DOMResult createUnmarshaller(ValidationEventHandler errorHandler) {
if(builder==null)
return new DOMResult();
else
return new DOMResult(builder.newDocument());
}
public Element getElement(DOMResult r) {
// JAXP spec is ambiguous about what really happens in this case,
// so work defensively
Node n = r.getNode();
if( n instanceof Document ) {
return ((Document)n).getDocumentElement();
}
if( n instanceof Element )
return (Element)n;
if( n instanceof DocumentFragment )
return (Element)n.getChildNodes().item(0);
// if the result object contains something strange,
// it is not a user problem, but it is a JAXB provider's problem.
// That's why we throw a runtime exception.
throw new IllegalStateException(n.toString());
}
public Source marshal(Element element, ValidationEventHandler errorHandler) {
return new DOMSource(element);
}
}
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