IPropertyHolder


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.List  ;
18  
19  /**
20   *  An interface that defines an object that can store named propertys.  The names
21   *  and the properties are Strings.
22   *
23   *  @author Howard Lewis Ship
24   *
25   **/
26  
27  public interface IPropertyHolder
28  {
29      /**
30       *  Returns a List of Strings, the names of all
31       *  properties held by the receiver.  May return an empty list.
32       *  The List is sorted alphabetically.  The List may be modified
33       *  without affecting this property holder.
34       *
35       *  <p>Prior to release 2.2, this method returned Collection.
36       * 
37       **/
38  
39      public List   getPropertyNames();
40  
41      /**
42       *  Sets a named property.  The new value replaces the existing value, if any.
43       *  Setting a property to null is the same as removing the property.
44       *
45       **/
46  
47      public void setProperty(String   name, String   value);
48  
49      /**
50       *  Removes the named property, if present.
51       *
52       **/
53  
54      public void removeProperty(String   name);
55  
56      /**
57       *  Retrieves the named property, or null if the property is not defined.
58       *
59       **/
60  
61      public String   getProperty(String   name);
62  }
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