PersistentPropertyDataEncoder


1   // Copyright 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.record;
16  
17  import java.util.List  ;
18  
19  /**
20   * Responsible for encoding {@link org.apache.tapestry.record.PropertyChange}s into and out of plain
21   * strings.
22   * 
23   * @author Howard M. Lewis Ship
24   * @since 4.0
25   */
26  public interface PersistentPropertyDataEncoder
27  {
28      /**
29       * Encodes a (possibly empty) list of {@link PropertyChange}s into a string representation that
30       * can later be decoded.
31       * 
32       * @returns encoded string (possibly empty, but not null)
33       */
34      public String   encodePageChanges(List   changes);
35  
36      /**
37       * Takes a string with an encoded set of page changes, and converts it back into a list of
38       * {@link org.apache.tapestry.record.PropertyChange}s.
39       */
40  
41      public List   decodePageChanges(String   encoded);
42  
43  }

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