IPropertySource


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.engine;
16  
17  /**
18   *  A source for configuration properties.
19   *
20   *  @author Howard Lewis Ship
21   *  @since 2.3
22   *
23   **/
24  
25  public interface IPropertySource
26  {
27      /**
28       *  Returns the value for a given property, or null if the
29       *  source does not provide a value for the named property.
30       *  Implementations of IPropertySource may use delegation
31       *  to resolve the value (that is, if one property source returns null,
32       *  it may forward the request to another source).
33       * 
34       **/
35      
36      public String   getPropertyValue(String   propertyName);
37  }
38

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