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1   /* 
2    * Copyright (c) 2007, Fraunhofer-Gesellschaft
3    * All rights reserved.
4    * 
5    * Redistribution and use in source and binary forms, with or without
6    * modification, are permitted provided that the following conditions are
7    * met:
8    * 
9    * (1) Redistributions of source code must retain the above copyright
10   *     notice, this list of conditions and the disclaimer at the end.
11   *     Redistributions in binary form must reproduce the above copyright
12   *     notice, this list of conditions and the following disclaimer in
13   *     the documentation and/or other materials provided with the
14   *     distribution.
15   * 
16   * (2) Neither the name of Fraunhofer nor the names of its
17   *     contributors may be used to endorse or promote products derived
18   *     from this software without specific prior written permission.
19   * 
20   * DISCLAIMER
21   * 
22   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33   *  
34   */
35  package org.ogf.graap.wsag.security.core.server;
36  
37  import java.io.IOException;
38  import java.io.InputStream;
39  import java.net.URL;
40  import java.util.Enumeration;
41  
42  import org.ogf.graap.wsag.api.configuration.WSAG4JConfiguration;
43  
44  /**
45   * WSAG4JClassLoader
46   * 
47   * @author Oliver Waeldrich
48   * 
49   */
50  public class MerlinClassLoader extends ClassLoader
51  {
52  
53      private ClassLoader loader;
54  
55      /**
56       * Use the specified class loader as standard <code>ClassLoader</code>. Only resource resolving is
57       * customized by WSAG4J resource lookup.
58       * 
59       * @param loader
60       *            the class loader to use
61       */
62      public MerlinClassLoader( ClassLoader loader )
63      {
64          this.loader = loader;
65      }
66  
67      /**
68       * @param name
69       *            {@inheritDoc}
70       * @return {@inheritDoc}
71       */
72      public URL getResource( String name )
73      {
74          URL resource = loader.getResource( name );
75  
76          if ( resource == null )
77          {
78              try
79              {
80                  resource = WSAG4JConfiguration.findResourceURL( name );
81              }
82              catch ( Exception e )
83              {
84                  return resource;
85              }
86          }
87  
88          return resource;
89      }
90  
91      /**
92       * @param name
93       *            {@inheritDoc}
94       * @return {@inheritDoc}
95       * @see java.lang.ClassLoader#getResourceAsStream(java.lang.String)
96       */
97      public InputStream getResourceAsStream( String name )
98      {
99          InputStream resource = loader.getResourceAsStream( name );
100 
101         if ( resource == null )
102         {
103             try
104             {
105                 resource = WSAG4JConfiguration.findResource( name );
106             }
107             catch ( Exception e )
108             {
109                 return resource;
110             }
111         }
112         return resource;
113     }
114 
115     /**
116      * 
117      * @see java.lang.ClassLoader#clearAssertionStatus()
118      */
119     public void clearAssertionStatus()
120     {
121         loader.clearAssertionStatus();
122     }
123 
124     /**
125      * {@inheritDoc}
126      * 
127      * @see java.lang.Object#equals(java.lang.Object)
128      */
129     public boolean equals( Object obj )
130     {
131         return loader.equals( obj );
132     }
133 
134     /**
135      * {@inheritDoc}
136      */
137     public int hashCode()
138     {
139         return loader.hashCode();
140     }
141 
142     /**
143      * @param name
144      *            {@inheritDoc}
145      * @return {@inheritDoc}
146      * @throws IOException
147      * @see java.lang.ClassLoader#getResources(java.lang.String)
148      */
149     public Enumeration<URL> getResources( String name ) throws IOException
150     {
151         return loader.getResources( name );
152     }
153 
154     /**
155      * @param name
156      *            {@inheritDoc}
157      * @return {@inheritDoc}
158      * @throws ClassNotFoundException
159      * @see java.lang.ClassLoader#loadClass(java.lang.String)
160      */
161     public Class<?> loadClass( String name ) throws ClassNotFoundException
162     {
163         return loader.loadClass( name );
164     }
165 
166     /**
167      * {@inheritDoc}
168      * 
169      * @see java.lang.ClassLoader#setClassAssertionStatus(java.lang.String, boolean)
170      */
171     public void setClassAssertionStatus( String className, boolean enabled )
172     {
173         loader.setClassAssertionStatus( className, enabled );
174     }
175 
176     /**
177      * {@inheritDoc}
178      * 
179      * @see java.lang.ClassLoader#setDefaultAssertionStatus(boolean)
180      */
181     public void setDefaultAssertionStatus( boolean enabled )
182     {
183         loader.setDefaultAssertionStatus( enabled );
184     }
185 
186     /**
187      * {@inheritDoc}
188      * 
189      * @see java.lang.ClassLoader#setPackageAssertionStatus(java.lang.String, boolean)
190      */
191     public void setPackageAssertionStatus( String packageName, boolean enabled )
192     {
193         loader.setPackageAssertionStatus( packageName, enabled );
194     }
195 }