StringPropertySelectionModel


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.form;
16  
17  /**
18   *  Implementation of {@link IPropertySelectionModel} that allows one String from
19   *  an array of Strings to be selected as the property.
20   *
21   *  <p>Uses a simple index number as the value (used to represent the selected String).
22   *  This assumes that the possible values for the Strings will remain constant between
23   *  request cycles.
24   *
25   *  @author Howard Lewis Ship
26   * 
27   **/
28  
29  public class StringPropertySelectionModel implements IPropertySelectionModel
30  {
31      private String  [] options;
32  
33      /**
34       * Standard constructor.
35       *
36       * The options are retained (not copied).
37       **/
38  
39      public StringPropertySelectionModel(String  [] options)
40      {
41          this.options = options;
42      }
43  
44      public int getOptionCount()
45      {
46          return options.length;
47      }
48  
49      public Object   getOption(int index)
50      {
51          return options[index];
52      }
53  
54      /**
55       *  Labels match options.
56       *
57       **/
58  
59      public String   getLabel(int index)
60      {
61          return options[index];
62      }
63  
64      /**
65       *  Values are indexes into the array of options.
66       *
67       **/
68  
69      public String   getValue(int index)
70      {
71          return Integer.toString(index);
72      }
73  
74      public Object   translateValue(String   value)
75      {
76          int index;
77  
78          index = Integer.parseInt(value);
79  
80          return options[index];
81      }
82  
83  }
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