1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.upgrade.util;
24  
25  import com.liferay.portal.upgrade.StagnantRowException;
26  
27  import java.util.Iterator;
28  import java.util.LinkedHashMap;
29  import java.util.LinkedHashSet;
30  import java.util.Map;
31  import java.util.Set;
32  
33  /**
34   * <a href="MemoryValueMapper.java.html"><b><i>View Source</i></b></a>
35   *
36   * @author Alexander Chow
37   * @author Brian Wing Shun Chan
38   *
39   */
40  public class MemoryValueMapper implements ValueMapper {
41  
42      public MemoryValueMapper() {
43          this(new LinkedHashSet<Object>());
44      }
45  
46      public MemoryValueMapper(Set<Object> exceptions) {
47          _map = new LinkedHashMap<Object, Object>();
48          _exceptions = exceptions;
49      }
50  
51      public Object getNewValue(Object oldValue) throws Exception {
52          Object value = _map.get(oldValue);
53  
54          if (value == null) {
55              if (_exceptions.contains(oldValue)) {
56                  value = oldValue;
57              }
58              else {
59                  throw new StagnantRowException(String.valueOf(oldValue));
60              }
61          }
62  
63          return value;
64      }
65  
66      public void mapValue(Object oldValue, Object newValue) throws Exception {
67          _map.put(oldValue, newValue);
68      }
69  
70      public void appendException(Object exception) {
71          _exceptions.add(exception);
72      }
73  
74      public Iterator<Object> iterator() throws Exception {
75          return _map.keySet().iterator();
76      }
77  
78      public int size() throws Exception {
79          return _map.size();
80      }
81  
82      public Map<Object, Object> getMap() {
83          return _map;
84      }
85  
86      private Map<Object, Object> _map;
87      private Set<Object> _exceptions;
88  
89  }