BlockHandler


1   /* 
2    * Copyright 2004 Apache Software Foundation
3    * Licensed  under the  Apache License,  Version 2.0  (the "License");
4    * you may not use  this file  except in  compliance with the License.
5    * You may obtain a copy of the License at 
6    * 
7    *   http://www.apache.org/licenses/LICENSE-2.0
8    * 
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed  under the  License is distributed on an "AS IS" BASIS,
11   * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
12   * implied.
13   * 
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.avalon.repository;
19  
20  import java.io.IOException  ;
21  import java.net.URL  ;
22  import java.net.URLConnection  ;
23  import java.net.URLStreamHandler  ;
24  
25  /**
26   * Repository URL protocol handler.  
27   */
28  public class BlockHandler extends URLStreamHandler  
29  {
30  
31      /**
32       * Opens a connection to the specified URL.
33       *
34       * @param url A URL to open a connection to.
35       * @return The established connection.
36       * @throws IOException If a connection failure occurs.
37       */
38      protected URLConnection   openConnection( final URL   url )
39        throws IOException  
40      {
41          return new BlockURLConnection( url );
42      }
43  
44      protected int getDefaultPort()
45      {
46          return 0;
47      }
48  
49      protected String   toExternalForm( URL   url )
50      {
51        StringBuffer   result = new StringBuffer  ( "block:" );
52          if (url.getFile() != null )
53          {
54              result.append(url.getFile());
55          }
56        if (url.getRef() != null ) 
57          {
58            result.append("#");
59              result.append(url.getRef());
60        }
61        return result.toString();
62      }
63  }
64
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