Coverage report

  %line %branch
org.apache.commons.jelly.util.ClassLoaderUtils
27% 
62% 

 1  
 /*
 2  
  * Copyright 2002,2004 The Apache Software Foundation.
 3  
  *
 4  
  * Licensed under the Apache License, Version 2.0 (the "License");
 5  
  * you may not use this file except in compliance with the License.
 6  
  * You may obtain a copy of the License at
 7  
  *
 8  
  *      http://www.apache.org/licenses/LICENSE-2.0
 9  
  *
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS,
 12  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  
  * See the License for the specific language governing permissions and
 14  
  * limitations under the License.
 15  
  */
 16  
 
 17  
 package org.apache.commons.jelly.util;
 18  
 
 19  
 import org.apache.commons.logging.Log;
 20  
 import org.apache.commons.logging.LogFactory;
 21  
 
 22  
 /**
 23  
  * A class to centralize the class loader management code.
 24  
  */
 25  0
 public class ClassLoaderUtils {
 26  
 
 27  
     /** log for debug etc output */
 28  572
     private static final Log log = LogFactory.getLog(ClassLoaderUtils.class);
 29  
     
 30  
     /**
 31  
      * Return the class loader to be used for instantiating application objects
 32  
      * when required.  This is determined based upon the following rules:
 33  
      * <ul>
 34  
      * <li>The specified class loader, if any</li>
 35  
      * <li>The thread context class loader, if it exists and <code>useContextClassLoader</code> is true</li>
 36  
      * <li>The class loader used to load the calling class.
 37  
      * <li>The System class loader.
 38  
      * </ul>
 39  
      */
 40  
     public static ClassLoader getClassLoader(ClassLoader specifiedLoader, boolean useContextClassLoader, Class callingClass) {
 41  1781
         if (specclass="keyword">ifiedLoader != null) {
 42  0
             return specifiedLoader;
 43  
         }
 44  1781
         if (useContextClassLoader) {
 45  0
             ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
 46  0
             if (classLoader != null) {
 47  0
                 return classLoader;
 48  
             }
 49  
         }
 50  1781
         return getClassLoader(callingClass);
 51  
     }
 52  
 
 53  
     /**
 54  
      * Return the class loader to be used for instantiating application objects
 55  
      * when a context class loader is not specified.  This is determined based upon the following rules:
 56  
      * <ul>
 57  
      * <li>The specified class loader, if any</li>
 58  
      * <li>The class loader used to load the calling class.
 59  
      * <li>The System class loader.
 60  
      * </ul>
 61  
      */
 62  
     public static ClassLoader getClassLoader(ClassLoader specifiedLoader, Class callingClass) {
 63  0
         if (specclass="keyword">ifiedLoader != null) {
 64  0
             return specifiedLoader;
 65  
         }
 66  0
         return getClassLoader(callingClass);
 67  
     }
 68  
 
 69  
     /**
 70  
      * Get the loader for the given class. 
 71  
      * @param clazz the class to retrieve the loader for
 72  
      * @return the class loader that loaded the provided class
 73  
      */
 74  
     public static ClassLoader getClassLoader(Class clazz) {
 75  2639
         ClassLoader callersLoader = clazz.getClassLoader();
 76  2639
         if (callersLoader == null) {
 77  0
             callersLoader = ClassLoader.getSystemClassLoader();
 78  
         }
 79  2639
         return callersLoader;
 80  
     }
 81  
 
 82  
     /**
 83  
      * Loads the given class using the current Thread's context class loader first
 84  
      * otherwise use the class loader which loaded this class.
 85  
      */
 86  
     public static Class loadClass(String className, Class callingClass) throws ClassNotFoundException {
 87  156
         ClassLoader loader = Thread.currentThread().getContextClassLoader();
 88  156
         if (loader == null) {
 89  0
             return getClassLoader(callingClass).loadClass(className);
 90  
         } else {
 91  156
             return loader.loadClass(className);
 92  
         }
 93  
     }
 94  
 
 95  
     /**
 96  
      * Loads the given class using:
 97  
      * <ol>
 98  
      * <li>the specified classloader,</li>
 99  
      * <li>the current Thread's context class loader first, if asked</li>
 100  
      * <li>otherwise use the class loader which loaded this class.</li>
 101  
      * </ol>
 102  
      */
 103  
     public static Class loadClass(String className, ClassLoader specifiedLoader, boolean useContextLoader, Class callingClass) throws ClassNotFoundException {
 104  0
         Class clazz = null;
 105  0
         if (specclass="keyword">ifiedLoader != null) {
 106  
             try {
 107  0
                 clazz = specifiedLoader.loadClass(className);
 108  0
             } catch (ClassNotFoundException e) {
 109  0
                 log.debug("couldn't find class in specified loader", e);
 110  0
             }
 111  
         }
 112  0
         if (clazz == null && useContextLoader) {
 113  0
             ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
 114  0
             if (contextLoader != null) {
 115  
                 try {
 116  0
                     clazz = contextLoader.loadClass(className);
 117  0
                 } catch (ClassNotFoundException e) {
 118  0
                     log.debug("couldn't find class in specified loader", e);
 119  0
                 }
 120  
             }
 121  
         }
 122  0
         if (clazz == null) {
 123  0
             ClassLoader loader = getClassLoader(callingClass);
 124  0
             clazz = loader.loadClass(className);
 125  
         }
 126  0
         return clazz;
 127  
     }
 128  
 }

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