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Java > Open Source Codes > com > sun > enterprise > deployment > annotation > introspection > AbstractAnnotationScanner


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23 package com.sun.enterprise.deployment.annotation.introspection;
24
25 import java.util.HashSet JavaDoc;
26 import java.util.Set JavaDoc;
27
28 /**
29  * Abstract superclass for instance-based annotation scanners.
30  *
31  * @author tjquinn
32  */
33 public abstract class AbstractAnnotationScanner implements CustomAnnotationScanner {
34     
35     /** holds the annotations of interest to the specific type of scanner */
36     protected Set JavaDoc<String JavaDoc> annotations=null;
37     
38     /** Creates a new instance of AbstractAnnotationScanner */
39     public AbstractAnnotationScanner() {
40     }
41   
42     /**
43      * Invoked so the concrete subclass can populate the annotations set.
44      * <p>
45      * Concrete implementations of this method should add to the set one or more Strings
46      * corresponding to the annotations of interest.
47      *
48      * @param annotationsSet the Set object to be populated
49      */
50     protected abstract void init(Set JavaDoc<String JavaDoc> annotationsSet);
51
52     /**
53      * Test if the passed constant pool string is a reference to
54      * a Type.TYPE annotation of a J2EE component
55      *
56      * @String the constant pool info string
57      * @return true if it is an annotation reference of interest to this scanner
58      */
59     public boolean isAnnotation(String JavaDoc value) {
60         if (annotations==null) {
61             synchronized(this) {
62                 if (annotations == null) {
63                     annotations = new HashSet JavaDoc();
64                     init(annotations);
65                 }
66             }
67         }
68         return annotations.contains(value);
69     }
70 }
71
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