Source for gnu.inet.gopher.GopherURLConnection

   1: /*
   2:  * GopherURLConnection.java
   3:  * Copyright (C) 2003 The Free Software Foundation
   4:  * 
   5:  * This file is part of GNU inetlib, a library.
   6:  * 
   7:  * GNU inetlib is free software; you can redistribute it and/or modify
   8:  * it under the terms of the GNU General Public License as published by
   9:  * the Free Software Foundation; either version 2 of the License, or
  10:  * (at your option) any later version.
  11:  * 
  12:  * GNU inetlib is distributed in the hope that it will be useful,
  13:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15:  * GNU General Public License for more details.
  16:  * 
  17:  * You should have received a copy of the GNU General Public License
  18:  * along with this library; if not, write to the Free Software
  19:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20:  * 
  21:  * Linking this library statically or dynamically with other modules is
  22:  * making a combined work based on this library.  Thus, the terms and
  23:  * conditions of the GNU General Public License cover the whole
  24:  * combination.
  25:  *
  26:  * As a special exception, the copyright holders of this library give you
  27:  * permission to link this library with independent modules to produce an
  28:  * executable, regardless of the license terms of these independent
  29:  * modules, and to copy and distribute the resulting executable under
  30:  * terms of your choice, provided that you also meet, for each linked
  31:  * independent module, the terms and conditions of the license of that
  32:  * module.  An independent module is a module which is not derived from
  33:  * or based on this library.  If you modify this library, you may extend
  34:  * this exception to your version of the library, but you are not
  35:  * obliged to do so.  If you do not wish to do so, delete this
  36:  * exception statement from your version.
  37:  */
  38: 
  39: package gnu.inet.gopher;
  40: 
  41: import java.io.InputStream;
  42: import java.io.IOException;
  43: import java.io.OutputStream;
  44: import java.net.UnknownServiceException;
  45: import java.net.URL;
  46: import java.net.URLConnection;
  47: 
  48: /**
  49:  * A Gopher URL connection.
  50:  *
  51:  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  52:  */
  53: public class GopherURLConnection
  54:   extends URLConnection
  55: {
  56: 
  57:   /**
  58:    * The connection managing the protocol exchange.
  59:    */
  60:   protected GopherConnection connection;
  61: 
  62:   /**
  63:    * Constructs a Gopher connection to the specified URL.
  64:    * @param url the URL
  65:    */
  66:   public GopherURLConnection(URL url)
  67:   {
  68:     super(url);
  69:   }
  70:   
  71:   /**
  72:    * Establishes the connection.
  73:    */
  74:   public void connect()
  75:     throws IOException
  76:   {
  77:     if (connected)
  78:       {
  79:         return;
  80:       }
  81:     String host = url.getHost();
  82:     int port = url.getPort();
  83:     connection = new GopherConnection(host, port);
  84:   }
  85:   
  86:   /**
  87:    * Returns an input stream that reads from this open connection.
  88:    */
  89:   public InputStream getInputStream()
  90:     throws IOException
  91:   {
  92:     if (!connected)
  93:       {
  94:         connect();
  95:       }
  96:     String dir = url.getPath();
  97:     String filename = url.getFile();
  98:     if (dir == null && filename == null)
  99:       {
 100:         throw new UnsupportedOperationException("not implemented");
 101:       }
 102:     else
 103:       {
 104:         String selector = (dir == null) ? filename :
 105:           dir + '/' + filename;
 106:         return connection.get(selector);
 107:       }
 108:   }
 109: 
 110:   /**
 111:    * Returns an output stream that writes to this connection.
 112:    */
 113:   public OutputStream getOutputStream()
 114:     throws IOException
 115:   {
 116:     throw new UnknownServiceException();
 117:   }
 118: 
 119:   public Object getContent()
 120:     throws IOException
 121:   {
 122:     return new GopherContentHandler().getContent(this);
 123:   }
 124: 
 125:   public Object getContent(Class[] classes)
 126:     throws IOException
 127:   {
 128:     return new GopherContentHandler().getContent(this, classes);
 129:   }
 130: 
 131: }