InitThreadContextClassLoadHelper


1   /* 
2    * Copyright 2004-2005 OpenSymphony 
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License"); you may not 
5    * use this file except in compliance with the License. You may obtain a copy 
6    * 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, WITHOUT 
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 
13   * License for the specific language governing permissions and limitations 
14   * under the License.
15   * 
16   */
17  
18  /*
19   * Previously Copyright (c) 2001-2004 James House
20   */
21  package org.quartz.simpl;
22  
23  import org.quartz.spi.ClassLoadHelper;
24  
25  import java.net.URL  ;
26  import java.io.InputStream  ;
27  
28  /**
29   * A <code>ClassLoadHelper</code> that uses either the context class loader
30   * of the thread that initialized Quartz.
31   * 
32   * @see org.quartz.spi.ClassLoadHelper
33   * @see org.quartz.simpl.ThreadContextClassLoadHelper
34   * @see org.quartz.simpl.SimpleClassLoadHelper
35   * @see org.quartz.simpl.CascadingClassLoadHelper
36   * @see org.quartz.simpl.LoadingLoaderClassLoadHelper
37   * 
38   * @author jhouse
39   */
40  public class InitThreadContextClassLoadHelper implements ClassLoadHelper {
41  
42      
43      /*
44       * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
45       * 
46       * Data members.
47       * 
48       * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
49       */
50  
51      private ClassLoader   initClassLoader;
52  
53      /*
54       * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
55       * 
56       * Interface.
57       * 
58       * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
59       */
60  
61      /**
62       * Called to give the ClassLoadHelper a chance to initialize itself,
63       * including the oportunity to "steal" the class loader off of the calling
64       * thread, which is the thread that is initializing Quartz.
65       */
66      public void initialize() {
67          initClassLoader = Thread.currentThread().getContextClassLoader();
68      }
69  
70      /**
71       * Return the class with the given name.
72       */
73      public Class   loadClass(String   name) throws ClassNotFoundException   {
74          return initClassLoader.loadClass(name);
75      }
76  
77      /**
78       * Finds a resource with a given name. This method returns null if no
79       * resource with this name is found.
80       * @param name name of the desired resource
81       * @return a java.net.URL object
82       */
83      public URL   getResource(String   name) {
84          return initClassLoader.getResource(name);
85      }
86  
87      /**
88       * Finds a resource with a given name. This method returns null if no
89       * resource with this name is found.
90       * @param name name of the desired resource
91       * @return a java.io.InputStream object
92       */
93      public InputStream   getResourceAsStream(String   name) {
94          return initClassLoader.getResourceAsStream(name);
95      }
96  }
97
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