BasePropertyHolder


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.util;
16  
17  import java.util.ArrayList  ;
18  import java.util.Collections  ;
19  import java.util.HashMap  ;
20  import java.util.List  ;
21  import java.util.Map  ;
22  
23  /**
24   *  Base class implementation for the {@link IPropertyHolder} interface.
25   *
26   *
27   *  @author Howard Lewis Ship
28   *
29   **/
30  
31  public class BasePropertyHolder implements IPropertyHolder
32  {
33      private static final int MAP_SIZE = 7;
34      private Map   properties;
35  
36      public String   getProperty(String   name)
37      {
38          if (properties == null)
39              return null;
40  
41          return (String  ) properties.get(name);
42      }
43  
44      public void setProperty(String   name, String   value)
45      {
46          if (value == null)
47          {
48              removeProperty(name);
49              return;
50          }
51  
52          if (properties == null)
53              properties = new HashMap  (MAP_SIZE);
54  
55          properties.put(name, value);
56      }
57  
58      public void removeProperty(String   name)
59      {
60          if (properties == null)
61              return;
62  
63          properties.remove(name);
64      }
65  
66      public List   getPropertyNames()
67      {
68          if (properties == null)
69              return Collections.EMPTY_LIST;
70  
71          List   result = new ArrayList  (properties.keySet());
72          
73          Collections.sort(result);
74          
75          return result;
76      }
77  
78  }
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