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1   /*
2    * Copyright 2000-2001,2004 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.jetspeed.xml;
18  
19  import java.io.*;
20  //Jetspeed cache
21  import org.apache.jetspeed.cache.disk.*;
22  
23  import org.xml.sax.*;
24  
25  
26  /***
27   * an entity resolver which tries to lookup DTD files
28   * through the URL Manager.
29   *
30   * TODO: Should be a singleton.
31   *
32   *@author <A HREF="mailto:christian.sell@netcologne.de">Christian Sell</A>
33   *@author <A HREF="mailto:sgala@hisitech.com">Santiago Gala</A>
34   *@version $Id: JetspeedXMLEntityResolver.java,v 1.8 2004/02/23 03:14:43 jford Exp $ 
35   *
36   **/
37  public class JetspeedXMLEntityResolver implements EntityResolver
38  {
39      public InputSource resolveEntity (String publicId, String systemId)
40      {
41          try {
42              //access Jetspeed cache and get a java.io.Reader
43              Reader rdr = JetspeedDiskCache.getInstance().
44                  getEntry(systemId).getReader();
45              InputSource is = new InputSource(rdr);
46              is.setPublicId( publicId );
47              is.setSystemId( systemId );
48              return is;
49          } catch(IOException x)
50          {
51              System.err.println("JER: ( " + publicId  + 
52                                 " Taking " + systemId + " from cache throwed Exception: " + x);
53              
54          }
55          return null;
56      }
57  }