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


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 java.lang.reflect.Constructor JavaDoc;
25
26
27 /**
28  * Compares Constructors. This is used to make sure the constructor IDs line up between
29  * the advisor and the instrumentor.
30  *
31  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
32  * @version $Revision: 37406 $
33  */
34 public class ConstructorComparator implements java.util.Comparator JavaDoc
35 {
36    private ConstructorComparator() {}
37
38    public static final java.util.Comparator JavaDoc INSTANCE = new ConstructorComparator();
39         
40    private int compare(Constructor JavaDoc m1, Constructor JavaDoc m2) {
41       try {
42          Class JavaDoc[] args1 = m1.getParameterTypes();
43          Class JavaDoc[] args2 = m2.getParameterTypes();
44          if (args1.length < args2.length) return -1;
45          if (args1.length > args2.length) return 1;
46          for (int i = 0; i < args1.length; i++) {
47             int result = args1[i].getName().compareTo(
48                args2[i].getName());
49             if (result != 0) return result;
50          }
51       }
52       catch (Exception JavaDoc e) {
53          throw new RuntimeException JavaDoc(e);
54       }
55       // unreachable.
56 throw new Error JavaDoc();
57    }
58
59    public int compare(Object JavaDoc o1, Object JavaDoc o2) {
60       return compare((Constructor JavaDoc) o1, (Constructor JavaDoc) o2);
61    }
62 }
63
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