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Java > Open Source Codes > org > apache > tapestry > engine > IPropertySource


1 // Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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 JavaDoc getPropertyValue(String JavaDoc propertyName);
37 }
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