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Java > Open Source Codes > org > netbeans > mdr > handlers > EnumResolver


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19
20 package org.netbeans.mdr.handlers;
21
22 import org.netbeans.mdr.util.DebugException;
23 import org.netbeans.mdr.util.Logger;
24 import javax.jmi.reflect.InvalidNameException;
25 import javax.jmi.reflect.RefEnum;
26 import java.lang.reflect.Field JavaDoc;
27 import java.util.Hashtable JavaDoc;
28
29 /**
30  *
31  * @author Martin Matula
32  */
33 public final class EnumResolver {
34     private static final String JavaDoc ENUMIMPL_SUFFIX = "Enum";
35     private static final Hashtable JavaDoc enumCache = new Hashtable JavaDoc(50);
36
37     /** Returns a correct instance of an enumeration class representing the requested literal
38      * @param ifcName Name of JMI interface generated for the enumeration.
39      * @param label Name of the requested literal.
40      * @return Instance of an enumeration class representing the literal.
41      */
42     public static synchronized RefEnum resolveEnum(String JavaDoc ifcName, String JavaDoc label) {
43         String JavaDoc enumKey = label + ":" + ifcName;
44         RefEnum en = (RefEnum) enumCache.get(enumKey);
45         
46         if (en == null) {
47             try {
48                 Class JavaDoc cl = BaseObjectHandler.resolveInterface(ifcName + ENUMIMPL_SUFFIX);
49                 Field JavaDoc f = cl.getField(org.netbeans.mdr.handlers.gen.TagSupport.mapEnumLiteral(label));
50                 en = (RefEnum) f.get(null);
51                 enumCache.put(enumKey, en);
52             } catch (NoSuchFieldException JavaDoc e) {
53                 throw new InvalidNameException(label, "Invalid literal name '" + label + "' for enumeration " + ifcName);
54             } catch (Exception JavaDoc e) {
55                 throw (DebugException) Logger.getDefault().annotate(new DebugException(), e);
56             }
57         }
58         
59         return en;
60     }
61     
62 }
63
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