01: /*
02: * @(#)$Id: Which.java,v 1.2.6.1 2007/05/31 21:58:57 ofung Exp $
03: */
04:
05: /*
06: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
07: *
08: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
09: *
10: * The contents of this file are subject to the terms of either the GNU
11: * General Public License Version 2 only ("GPL") or the Common Development
12: * and Distribution License("CDDL") (collectively, the "License"). You
13: * may not use this file except in compliance with the License. You can obtain
14: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
15: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
16: * language governing permissions and limitations under the License.
17: *
18: * When distributing the software, include this License Header Notice in each
19: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
20: * Sun designates this particular file as subject to the "Classpath" exception
21: * as provided by Sun in the GPL Version 2 section of the License file that
22: * accompanied this code. If applicable, add the following below the License
23: * Header, with the fields enclosed by brackets [] replaced by your own
24: * identifying information: "Portions Copyrighted [year]
25: * [name of copyright owner]"
26: *
27: * Contributor(s):
28: *
29: * If you wish your version of this file to be governed by only the CDDL or
30: * only the GPL Version 2, indicate your decision by adding "[Contributor]
31: * elects to include this software in this distribution under the [CDDL or GPL
32: * Version 2] license." If you don't indicate a single choice of license, a
33: * recipient has the option to distribute your version of this file under
34: * either the CDDL, the GPL Version 2 or to extend the choice of license to
35: * its licensees as provided above. However, if you add GPL Version 2 code
36: * and therefore, elected the GPL Version 2 license, then the option applies
37: * only if the new code is made subject to such option by the copyright
38: * holder.
39: */
40: package com.sun.xml.bind.util;
41:
42: import java.net.URL;
43:
44: /**
45: * Finds out where a class file is loaded from.
46: *
47: * @author
48: * Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
49: */
50: public class Which {
51:
52: public static String which(Class clazz) {
53: return which(clazz.getName(), clazz.getClassLoader());
54: }
55:
56: /**
57: * Search the specified classloader for the given classname.
58: *
59: * @param classname the fully qualified name of the class to search for
60: * @param loader the classloader to search
61: * @return the source location of the resource, or null if it wasn't found
62: */
63: public static String which(String classname, ClassLoader loader) {
64:
65: String classnameAsResource = classname.replace('.', '/')
66: + ".class";
67:
68: if (loader == null) {
69: loader = ClassLoader.getSystemClassLoader();
70: }
71:
72: URL it = loader.getResource(classnameAsResource);
73: if (it != null) {
74: return it.toString();
75: } else {
76: return null;
77: }
78: }
79:
80: }
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