1 /*
2 * Copyright (c) 2010 Carman Consulting, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.metastopheles.annotation;
18
19 import org.metastopheles.MetaDataDecorator;
20 import org.metastopheles.MetaDataObject;
21
22 import java.lang.annotation.Annotation;
23
24 /**
25 * An annotation-based metadata decorator. Subclasses merely need to override the #{decorate} method.
26 * @since 1.0
27 * @author James Carman
28 */
29 public abstract class AnnotationBasedMetaDataDecorator<T extends MetaDataObject, A extends Annotation> implements MetaDataDecorator<T>
30 {
31 //**********************************************************************************************************************
32 // Fields
33 //**********************************************************************************************************************
34
35 private final Class<A> annotationType;
36
37 //**********************************************************************************************************************
38 // Constructors
39 //**********************************************************************************************************************
40
41 public AnnotationBasedMetaDataDecorator(Class<A> annotationType)
42 {
43 this.annotationType = annotationType;
44 }
45
46 //**********************************************************************************************************************
47 // Abstract Methods
48 //**********************************************************************************************************************
49
50 protected abstract void decorate(T metaData, Annotation annotation);
51
52 //**********************************************************************************************************************
53 // MetaDataDecorator Implementation
54 //**********************************************************************************************************************
55
56 public void decorate(T metaData)
57 {
58 A annotation = metaData.getAnnotation(annotationType);
59 if (annotation != null)
60 {
61 decorate(metaData, annotation);
62 }
63 }
64 }