StringAdaptor


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.io;
16  
17  import org.apache.tapestry.services.DataSqueezer;
18  
19  /**
20   *  Squeezes a String (which is pretty simple, most of the time).
21   *
22   *  @author Howard Lewis Ship
23   *
24   **/
25  
26  class StringAdaptor implements ISqueezeAdaptor
27  {
28      private static final String   PREFIX = "S";
29  
30      public void register(DataSqueezer squeezer)
31      {
32          squeezer.register(PREFIX, String  .class, this);
33      }
34  
35      public String   squeeze(DataSqueezer squeezer, Object   data)
36      {
37          String   string = (String  ) data;
38  
39          return PREFIX + string;
40      }
41  
42      /**
43       *  Strips the prefix from the string.  This method is only
44       *  invoked by the {@link DataSqueezerImpl} if the string leads
45       *  with its normal prefix (an 'S').
46       *
47       **/
48  
49      public Object   unsqueeze(DataSqueezer squeezer, String   string)
50      {
51          if (string.length() == 1)
52              return "";
53  
54          return string.substring(1);
55      }
56  }

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