ThreadContextClassLoadHelper


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 current thread's
30   * context class loader (<code>Thread.currentThread().getContextClassLoader().loadClass( .. )</code>).
31   * 
32   * @see org.quartz.spi.ClassLoadHelper
33   * @see org.quartz.simpl.InitThreadContextClassLoadHelper
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 ThreadContextClassLoadHelper implements ClassLoadHelper {
41  
42      /*
43       * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
44       * 
45       * Interface.
46       * 
47       * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
48       */
49  
50      /**
51       * Called to give the ClassLoadHelper a chance to initialize itself,
52       * including the oportunity to "steal" the class loader off of the calling
53       * thread, which is the thread that is initializing Quartz.
54       */
55      public void initialize() {
56      }
57  
58      /**
59       * Return the class with the given name.
60       */
61      public Class   loadClass(String   name) throws ClassNotFoundException   {
62          return getClassLoader().loadClass(name);
63      }
64  
65      /**
66       * Finds a resource with a given name. This method returns null if no
67       * resource with this name is found.
68       * @param name name of the desired resource
69       * @return a java.net.URL object
70       */
71      public URL   getResource(String   name) {
72          return getClassLoader().getResource(name);
73      }
74  
75      /**
76       * Finds a resource with a given name. This method returns null if no
77       * resource with this name is found.
78       * @param name name of the desired resource
79       * @return a java.io.InputStream object
80       */
81      public InputStream   getResourceAsStream(String   name) {
82          return getClassLoader().getResourceAsStream(name);
83      }
84  
85  
86      private ClassLoader   getClassLoader() {
87          return Thread.currentThread().getContextClassLoader();
88      }
89  }
90
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