Context


1   package org.apache.beehive.controls.api.context;
2   /*
3    * Copyright 2004 The Apache Software Foundation.
4    *
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    * 
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   *
17   * $Header:$
18   */
19  
20  import java.lang.annotation.ElementType  ;
21  import java.lang.annotation.Retention  ;
22  import java.lang.annotation.RetentionPolicy  ;
23  import java.lang.annotation.Target  ;
24  
25  /**
26   * The Context annotation type is used to annotate a field within a control implementation
27   * class that refers to a contextual service.  The Java Controls runtime will automatically
28   * initialize the field value to an appropriate provider of the requested service, or will
29   * throw a construction or deserialization error if no such provider is available.
30   *
31   * The following is a simple example:
32   *
33   * <code><pre>
34   * <sp>@ControlImplementation
35   * public class MyControlImpl
36   * {
37   *     <sp>@Context
38   *     ControlContext myContext;
39   * }
40   * </pre></code>
41   * This example declares a field named <code>myContext</code> that will automatically be
42   * initialized by the Java Controls runtime to refer to a provider of the 
43   * <code>ControlContext</code> contextual service.
44   */
45  @Retention  (RetentionPolicy.RUNTIME)
46  @Target  ({ElementType.FIELD})
47  public @interface Context
48  {
49  
50  }
51

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