1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.bind.util;
  27 
  28 import java.net.URL;
  29 
  30 /**
  31  * Finds out where a class file is loaded from.
  32  *
  33  * @author
  34  *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
  35  */
  36 public class Which {
  37 
  38     public static String which( Class clazz ) {
  39         return which( clazz.getName(), SecureLoader.getClassClassLoader(clazz));
  40     }
  41 
  42     /**
  43      * Search the specified classloader for the given classname.
  44      *
  45      * @param classname the fully qualified name of the class to search for
  46      * @param loader the classloader to search
  47      * @return the source location of the resource, or null if it wasn't found
  48      */
  49     public static String which(String classname, ClassLoader loader) {
  50 
  51         String classnameAsResource = classname.replace('.', '/') + ".class";
  52 
  53         if(loader == null) {
  54             loader = SecureLoader.getSystemClassLoader();
  55         }
  56 
  57         URL it = loader.getResource(classnameAsResource);
  58         if (it != null) {
  59             return it.toString();
  60         } else {
  61             return null;
  62         }
  63     }
  64 
  65 }