ValuePart


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.multipart;
16  
17  import java.util.ArrayList  ;
18  import java.util.List  ;
19  
20  /**
21   * A portion of a multipart request that stores a value, or values, for a parameter.
22   * 
23   * @author Howard Lewis Ship
24   * @since 2.0.1
25   */
26  
27  public class ValuePart
28  {
29      private int _count;
30  
31      // Stores either String or List of String
32      private Object   _value;
33  
34      public ValuePart(String   value)
35      {
36          _count = 1;
37          _value = value;
38      }
39  
40      public int getCount()
41      {
42          return _count;
43      }
44  
45      /**
46       * Returns the value, or the first value (if multi-valued).
47       */
48  
49      public String   getValue()
50      {
51          if (_count == 1)
52              return (String  ) _value;
53  
54          List   l = (List  ) _value;
55  
56          return (String  ) l.get(0);
57      }
58  
59      /**
60       * Returns the values as an array of strings. If there is only one value, it is returned wrapped
61       * as a single element array.
62       */
63  
64      public String  [] getValues()
65      {
66          if (_count == 1)
67              return new String  []
68              { (String  ) _value };
69  
70          List   l = (List  ) _value;
71  
72          return (String  []) l.toArray(new String  [_count]);
73      }
74  
75      public void add(String   newValue)
76      {
77          if (_count == 1)
78          {
79              List   l = new ArrayList  ();
80              l.add(_value);
81              l.add(newValue);
82  
83              _value = l;
84              _count++;
85              return;
86          }
87  
88          List   l = (List  ) _value;
89          l.add(newValue);
90          _count++;
91      }
92  
93      /**
94       * Does nothing.
95       */
96  
97      public void cleanup()
98      {
99      }
100 }
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