/*

 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

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 1.6, JAXB 2.0

 */

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);

    }

}