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Java > Open Source Codes > org > jboss > repository > plugins > KeyMetaDataCombiner


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.repository.plugins;
23
24 import org.jboss.repository.spi.MetaDataCombiner;
25 import org.jboss.repository.spi.Key;
26 import org.jboss.repository.spi.MetaData;
27
28 /**
29  @author Scott.Stark@jboss.org
30  @version $Revision: 41119 $
31  */
32 public class KeyMetaDataCombiner
33    implements MetaDataCombiner
34 {
35    private MetaDataCombiner next;
36
37    public KeyMetaDataCombiner()
38    {
39       this(null);
40    }
41    public KeyMetaDataCombiner(MetaDataCombiner next)
42    {
43       this.next = next;
44    }
45
46    public MetaDataCombiner getNext()
47    {
48       return next;
49    }
50    public void setNext(MetaDataCombiner next)
51    {
52       this.next = next;
53    }
54
55    /**
56     Go through the
57     @param attributeLevels
58     @param data
59     @return
60     */
61    public Object JavaDoc combine(Key key, MetaData[] levelData)
62    {
63       int level = key.getLevel();
64       MetaData metadata = levelData[level];
65       Object JavaDoc value = null;
66       if( metadata != null )
67          value = metadata.getData();
68       if( next != null )
69          value = next.combine(key, levelData);
70       return value;
71    }
72
73 }
74
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