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    1   /**
    2    *  Licensed to the Apache Software Foundation (ASF) under one or more
    3    *  contributor license agreements.  See the NOTICE file distributed with
    4    *  this work for additional information regarding copyright ownership.
    5    *  The ASF licenses this file to You under the Apache License, Version 2.0
    6    *  (the "License"); you may not use this file except in compliance with
    7    *  the License.  You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    *  Unless required by applicable law or agreed to in writing, software
   12    *  distributed under the License is distributed on an "AS IS" BASIS,
   13    *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    *  See the License for the specific language governing permissions and
   15    *  limitations under the License.
   16    */
   17   package org.apache.geronimo.kernel.util;
   18   
   19   import java.net.URLClassLoader;
   20   import java.net.URL;
   21   import org.apache.geronimo.kernel.config.MultiParentClassLoader;
   22   
   23   /**
   24    * Shows the ID and contents of a ClassLoader
   25    *
   26    * @version $Rev: 476049 $ $Date: 2006-11-16 20:35:17 -0800 (Thu, 16 Nov 2006) $
   27    */
   28   public class ClassLoaderDumper {
   29       public static void dump(Object o) {
   30           if(o != null) dump(o.getClass().getClassLoader());
   31       }
   32       public static void dump(Class cls) {
   33           System.out.println("ClassLoader dump for "+cls.getName());
   34           dump(cls.getClassLoader());
   35       }
   36       public static void dump(ClassLoader loader) {
   37           dumpIDs("", loader);
   38           dumpContents("", loader);
   39       }
   40       private static void dumpIDs(String prefix, ClassLoader loader) {
   41           if(loader == null) return;
   42           System.out.println(prefix+"ClassLoader is "+loader);
   43   
   44           if(loader instanceof MultiParentClassLoader) {
   45               MultiParentClassLoader mp = (MultiParentClassLoader) loader;
   46               ClassLoader[] parents = mp.getParents();
   47               for (int i = 0; i < parents.length; i++) {
   48                   dumpIDs(prefix+"  ", parents[i]);
   49               }
   50           } else {
   51               dumpIDs(prefix+"  ", loader.getParent());
   52           }
   53       }
   54       private static void dumpContents(String prefix, ClassLoader loader) {
   55           if(loader == null) return;
   56           System.out.println(prefix+"ClassLoader is "+loader);
   57   
   58           if(loader instanceof URLClassLoader) {
   59               URLClassLoader url = (URLClassLoader) loader;
   60               URL[] entries = url.getURLs();
   61               for (int i = 0; i < entries.length; i++) {
   62                   URL entry = entries[i];
   63                   System.out.println(prefix+"  "+entry);
   64               }
   65           }
   66           if(loader instanceof MultiParentClassLoader) {
   67               MultiParentClassLoader mp = (MultiParentClassLoader) loader;
   68               ClassLoader[] parents = mp.getParents();
   69               for (int i = 0; i < parents.length; i++) {
   70                   dumpContents(prefix+"    ", parents[i]);
   71               }
   72           } else {
   73               dumpContents(prefix+"    ", loader.getParent());
   74           }
   75       }
   76   }

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