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Java > Open Source Codes > org > jboss > aop > util > CtConstructorComparator


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.aop.util;
23
24 import javassist.CtClass;
25 import javassist.CtConstructor;
26 import javassist.bytecode.Descriptor;
27
28 /**
29  * Compares CtConstructors. Used to ensure that the constructor IDs line up between the
30  * instrumentor and advisor.
31  *
32  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
33  * @version $Revision: 37406 $
34  */
35 public class CtConstructorComparator implements java.util.Comparator JavaDoc {
36
37     private CtConstructorComparator() {}
38
39     public static final java.util.Comparator JavaDoc INSTANCE = new CtConstructorComparator();
40         
41     private int compare(CtConstructor m1, CtConstructor m2) {
42         try {
43             CtClass[] args1 = m1.getParameterTypes();
44             CtClass[] args2 = m2.getParameterTypes();
45             if (args1.length < args2.length) return -1;
46             if (args1.length > args2.length) return 1;
47             for (int i = 0; i < args1.length; i++) {
48                 String JavaDoc name1 =
49                     Descriptor.toJavaName(Descriptor.toJvmName(args1[i]));
50                 String JavaDoc name2 =
51                     Descriptor.toJavaName(Descriptor.toJvmName(args2[i]));
52                 int result = name1.compareTo(name2);
53                 if (result != 0) return result;
54             }
55         }
56         catch (Exception JavaDoc e) {
57             throw new RuntimeException JavaDoc(e);
58         }
59         
60         // unreachable.
61 throw new Error JavaDoc();
62     }
63
64     public int compare(Object JavaDoc o1, Object JavaDoc o2) {
65         return compare((CtConstructor) o1, (CtConstructor) o2);
66     }
67
68 }
69
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