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⏎ javax/xml/transform/dom/DOMResult.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// $Id: DOMResult.java 569995 2007-08-27 04:31:06Z mrglavas $

package javax.xml.transform.dom;

import javax.xml.transform.Result;
import org.w3c.dom.Node;

/**
 * <p>Acts as a holder for a transformation result tree in the form of a Document Object Model (DOM) tree.</p>
 * 
 * <p>If no output DOM source is set, the transformation will create a Document node as the holder for the result of the transformation,
 * which may be retrieved with {@link #getNode()}.</p>
 * 
 * @author <a href="Jeff.Suttor@Sun.com">Jeff Suttor</a>
 * @version $Revision: 569995 $, $Date: 2007-08-27 00:31:06 -0400 (Mon, 27 Aug 2007) $
 */
public class DOMResult implements Result {

    /** <p>If {@link javax.xml.transform.TransformerFactory#getFeature}
     * returns <code>true</code> when passed this value as an argument,
     * the <code>Transformer</code> supports <code>Result</code> output of this type.</p>
     */
    public static final String FEATURE = "http://javax.xml.transform.dom.DOMResult/feature";

    /**
     * <p>Zero-argument default constructor.</p>
     * 
     * <p><code>node</code>,
     * <code>siblingNode</code> and
     * <code>systemId</code>
     * will be set to <code>null</code>.</p>
     */
    public DOMResult() {
        setNode(null);
        setNextSibling(null);
        setSystemId(null);
    }

    /**
     * <p>Use a DOM node to create a new output target.</p>
     * 
     * <p>In practice, the node should be
     * a {@link org.w3c.dom.Document} node,
     * a {@link org.w3c.dom.DocumentFragment} node, or
     * a {@link org.w3c.dom.Element} node.
     * In other words, a node that accepts children.</p>
     *
     * <p><code>siblingNode</code> and
     * <code>systemId</code>
     * will be set to <code>null</code>.</p>
     * 
     * @param node The DOM node that will contain the result tree.
     */
    public DOMResult(Node node) {
        setNode(node);
        setNextSibling(null);
        setSystemId(null);
    }

    /**
     * <p>Use a DOM node to create a new output target with the specified System ID.<p>
     * 
     * <p>In practice, the node should be
     * a {@link org.w3c.dom.Document} node,
     * a {@link org.w3c.dom.DocumentFragment} node, or
     * a {@link org.w3c.dom.Element} node.
     * In other words, a node that accepts children.</p>
     *
     * <p><code>siblingNode</code> will be set to <code>null</code>.</p>
     * 
     * @param node The DOM node that will contain the result tree.
     * @param systemId The system identifier which may be used in association with this node.
     */
    public DOMResult(Node node, String systemId) {
        setNode(node);
        setNextSibling(null);
        setSystemId(systemId);
    }

    /**
     * <p>Use a DOM node to create a new output target specifying the child node where the result nodes should be inserted before.</p>
     * 
     * <p>In practice, <code>node</code> and <code>nextSibling</code> should be
     * a {@link org.w3c.dom.Document} node,
     * a {@link org.w3c.dom.DocumentFragment} node, or
     * a {@link org.w3c.dom.Element} node.
     * In other words, a node that accepts children.</p>
     * 
     * <p>Use <code>nextSibling</code> to specify the child node 
     * where the result nodes should be inserted before. 
     * If <code>nextSibling</code> is not a sibling of <code>node</code>,
     * then an <code>IllegalArgumentException</code> is thrown.
     * If <code>node</code> is <code>null</code> and <code>nextSibling</code> is not <code>null</code>,
     * then an <code>IllegalArgumentException</code> is thrown.
     * If <code>nextSibling</code> is <code>null</code>,
     * then the behavior is the same as calling {@link #DOMResult(Node node)},
     * i.e. append the result nodes as the last child of the specified <code>node</code>.</p>
     * 
     * <p><code>systemId</code> will be set to <code>null</code>.</p>
     * 
     * @param node The DOM node that will contain the result tree.
     * @param nextSibling The child node where the result nodes should be inserted before.
     * 
     * @throws IllegalArgumentException If <code>nextSibling</code> is not a sibling of <code>node</code>.
     * @throws IllegalArgumentException If <code>node</code> is <code>null</code> and <code>nextSibling</code> is not <code>null</code>.
     * 
     * @since 1.5
     */
    public DOMResult(Node node, Node nextSibling) {
        
        // does the corrent parent/child relationship exist?
        if (nextSibling != null) {
            // cannot be a sibling of a null node
            if (node == null) {
                throw new IllegalArgumentException("Cannot create a DOMResult when the nextSibling is contained by the \"null\" node.");
            }
            
            // nextSibling contained by node?
            if ((node.compareDocumentPosition(nextSibling)&Node.DOCUMENT_POSITION_CONTAINED_BY)==0) {
                throw new IllegalArgumentException("Cannot create a DOMResult when the nextSibling is not contained by the node.");
            }
        }

        setNode(node);
        setNextSibling(nextSibling);
        setSystemId(null);
    }

    /**
     * <p>Use a DOM node to create a new output target specifying the child node where the result nodes should be inserted before and
     * the specified System ID.</p>
     * 
     * <p>In practice, <code>node</code> and <code>nextSibling</code> should be
     * a {@link org.w3c.dom.Document} node,
     * a {@link org.w3c.dom.DocumentFragment} node, or a
     * {@link org.w3c.dom.Element} node.
     * In other words, a node that accepts children.</p>
     *
     * <p>Use <code>nextSibling</code> to specify the child node 
     * where the result nodes should be inserted before.
     * If <code>nextSibling</code> is not a sibling of <code>node</code>,
     * then an <code>IllegalArgumentException</code> is thrown.
     * If <code>node</code> is <code>null</code> and <code>nextSibling</code> is not <code>null</code>,
     * then an <code>IllegalArgumentException</code> is thrown.
     * If <code>nextSibling</code> is <code>null</code>,
     * then the behavior is the same as calling {@link #DOMResult(Node node, String systemId)},
     * i.e. append the result nodes as the last child of the specified node and use the specified System ID.</p>
     * 
     * @param node The DOM node that will contain the result tree.
     * @param nextSibling The child node where the result nodes should be inserted before.
     * @param systemId The system identifier which may be used in association with this node.
     * 
     * @throws IllegalArgumentException If <code>nextSibling</code> is not a sibling of <code>node</code>.
     * @throws IllegalArgumentException If <code>node</code> is <code>null</code> and <code>nextSibling</code> is not <code>null</code>.
     * 
     * @since 1.5
     */
    public DOMResult(Node node, Node nextSibling, String systemId) {

        // does the current parent/child relationship exist?
        if (nextSibling != null) {
            // cannot be a sibling of a null node
            if (node == null) {
                throw new IllegalArgumentException("Cannot create a DOMResult when the nextSibling is contained by the \"null\" node.");
            }
            
            // nextSibling contained by node?
            if ((node.compareDocumentPosition(nextSibling)&Node.DOCUMENT_POSITION_CONTAINED_BY)==0) {
                throw new IllegalArgumentException("Cannot create a DOMResult when the nextSibling is not contained by the node.");
            }
        }

        setNode(node);
        setNextSibling(nextSibling);
        setSystemId(systemId);
    }

    /**
     * <p>Set the node that will contain the result DOM tree.<p>
     * 
     * <p>In practice, the node should be
     * a {@link org.w3c.dom.Document} node,
     * a {@link org.w3c.dom.DocumentFragment} node, or
     * a {@link org.w3c.dom.Element} node.
     * In other words, a node that accepts children.</p>
     * 
     * <p>An <code>IllegalStateException</code> is thrown if <code>nextSibling</code> is not <code>null</code> and
     * <code>node</code> is not a parent of <code>nextSibling</code>. 
     * An <code>IllegalStateException</code> is thrown if <code>node</code> is <code>null</code> and
     * <code>nextSibling</code> is not <code>null</code>.</p> 
     *
     * @param node The node to which the transformation will be appended.
     * 
     * @throws IllegalStateException If <code>nextSibling</code> is not <code>null</code> and
     *   <code>nextSibling</code> is not a child of <code>node</code>.
     * @throws IllegalStateException If <code>node</code> is <code>null</code> and
     *   <code>nextSibling</code> is not <code>null</code>.
     */
    public void setNode(Node node) {
        // does the corrent parent/child relationship exist?
        if (nextSibling != null) {
            // cannot be a sibling of a null node
            if (node == null) {
                throw new IllegalStateException("Cannot create a DOMResult when the nextSibling is contained by the \"null\" node.");
            }
            
            // nextSibling contained by node?
            if ((node.compareDocumentPosition(nextSibling)&Node.DOCUMENT_POSITION_CONTAINED_BY)==0) {
                throw new IllegalArgumentException("Cannot create a DOMResult when the nextSibling is not contained by the node.");
            }
        }

        this.node = node;
    }

    /**
     * <p>Get the node that will contain the result DOM tree.</p>
     * 
     * <p>If no node was set via
     * {@link #DOMResult(Node node)},
     * {@link #DOMResult(Node node, String systeId)},
     * {@link #DOMResult(Node node, Node nextSibling)},
     * {@link #DOMResult(Node node, Node nextSibling, String systemId)} or
     * {@link #setNode(Node node)},
     * then the node will be set by the transformation, and may be obtained from this method once the transformation is complete.
     * Calling this method before the transformation will return <code>null</code>.</p>
     *
     * @return The node to which the transformation will be appended.
     */
    public Node getNode() {
        return node;
    }

    /**
     * <p>Set the child node before which the result nodes will be inserted.</p>
     *
     * <p>Use <code>nextSibling</code> to specify the child node
     * before which the result nodes should be inserted.
     * If <code>nextSibling</code> is not a descendant of <code>node</code>,
     * then an <code>IllegalArgumentException</code> is thrown.
     * If <code>node</code> is <code>null</code> and <code>nextSibling</code> is not <code>null</code>,
     * then an <code>IllegalStateException</code> is thrown.
     * If <code>nextSibling</code> is <code>null</code>,
     * then the behavior is the same as calling {@link #DOMResult(Node node)},
     * i.e. append the result nodes as the last child of the specified <code>node</code>.</p>
     * 
     * @param nextSibling The child node before which the result nodes will be inserted.
     * 
     * @throws IllegalArgumentException If <code>nextSibling</code> is not a descendant of <code>node</code>.
     * @throws IllegalStateException If <code>node</code> is <code>null</code> and <code>nextSibling</code> is not <code>null</code>.
     * 
     * @since 1.5
     */
    public void setNextSibling(Node nextSibling) {
        
        // does the corrent parent/child relationship exist?
        if (nextSibling != null) {
            // cannot be a sibling of a null node
            if (node == null) {
                throw new IllegalStateException("Cannot create a DOMResult when the nextSibling is contained by the \"null\" node.");
            }
            
            // nextSibling contained by node?
            if ((node.compareDocumentPosition(nextSibling)&Node.DOCUMENT_POSITION_CONTAINED_BY)==0) {
                throw new IllegalArgumentException("Cannot create a DOMResult when the nextSibling is not contained by the node.");
            }
        }

        this.nextSibling = nextSibling;
    }

    /**
     * <p>Get the child node before which the result nodes will be inserted.</p>
     * 
     * <p>If no node was set via
     * {@link #DOMResult(Node node, Node nextSibling)},
     * {@link #DOMResult(Node node, Node nextSibling, String systemId)} or
     * {@link #setNextSibling(Node nextSibling)},
     * then <code>null</code> will be returned.</p>
     *
     * @return The child node before which the result nodes will be inserted.
     * 
     * @since 1.5
     */
    public Node getNextSibling() {
        return nextSibling;
    }

    /**
     * <p>Set the systemId that may be used in association with the node.</p>
     *
     * @param systemId The system identifier as a URI string.
     */
    public void setSystemId(String systemId) {
        this.systemId = systemId;
    }

    /**
     * <p>Get the System Identifier.</p>
     * 
     * <p>If no System ID was set via
     * {@link #DOMResult(Node node, String systemId)},
     * {@link #DOMResult(Node node, Node nextSibling, String systemId)} or
     * {@link #setSystemId(String systemId)},
     * then <code>null</code> will be returned.</p>
     *
     * @return The system identifier.
     */
    public String getSystemId() {
        return systemId;
    }

    //////////////////////////////////////////////////////////////////////
    // Internal state.
    //////////////////////////////////////////////////////////////////////

    /**
     * <p>The node to which the transformation will be appended.</p>
     */
    private Node node = null;

    /**
     * <p>The child node before which the result nodes will be inserted.</p>
     * 
     * @since 1.5
     */
    private Node nextSibling = null;

    /**
     * <p>The System ID that may be used in association with the node.</p>
     */
    private String systemId = null;
}

⏎ javax/xml/transform/dom/DOMResult.java

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