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1   package org.codehaus.plexus.metadata.merge;
2   
3   /*
4    * The MIT License
5    *
6    * Copyright (c) 2006, The Codehaus
7    *
8    * Permission is hereby granted, free of charge, to any person obtaining a copy of
9    * this software and associated documentation files (the "Software"), to deal in
10   * the Software without restriction, including without limitation the rights to
11   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
12   * of the Software, and to permit persons to whom the Software is furnished to do
13   * so, subject to the following conditions:
14   *
15   * The above copyright notice and this permission notice shall be included in all
16   * copies or substantial portions of the Software.
17   *
18   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24   * SOFTWARE.
25   */
26  
27  import org.codehaus.plexus.component.annotations.Component;
28  import org.codehaus.plexus.metadata.merge.support.PlexusRootElement;
29  import org.jdom.Document;
30  
31  /**
32   * Plexus XML merger. This is a superset of the components xml merger so can be used in its place if necessary.
33   *
34   * @author <a href='mailto:rahul.thakur.xdev@gmail.com'>Rahul Thakur</a>
35   * @version $Id$
36   */
37  @Component(role=Merger.class,hint="plexusXml")
38  public class PlexusXmlMerger
39      extends AbstractMerger
40  {
41      /**
42       * @see org.codehaus.plexus.metadata.merge.Merger#merge(org.jdom.Document, org.jdom.Document)
43       */
44      public Document merge( Document dDocument, Document rDocument )
45          throws MergeException
46      {
47          // TODO: Ideally we don't want to manipulate the original
48          // dominant document but use its copy for merge. 
49          //Document mDoc = (Document) dDocument.clone();        // doesn't merge properly
50          Document mDoc = dDocument;
51          PlexusRootElement dCSE = new PlexusRootElement( mDoc.getRootElement() );
52          PlexusRootElement rCSE = new PlexusRootElement( rDocument.getRootElement() );
53          dCSE.merge( rCSE );
54          // the contents are merged into the dominant document DOM.
55          return mDoc;
56      }
57  }