1 /**
   2  * AUTOHIT 2003
   3  * Copyright Erich P Gatejen (c) 1989,1997,2003,2004
   4  * 
   5  * This program is free software; you can redistribute it and/or modify 
   6  * it under the terms of the GNU General Public License as published by 
   7  * the Free Software Foundation; either version 2 of the License, or (at
   8  * your option) any later version.
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  * 
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  *
  18  * Additional license information can be found in the documentation.
  19  * @author Erich P Gatejen
  20  */
  21 package autohit.universe;
  22 
  23 import java.io.IOException;
  24 import java.io.InputStream;
  25 
  26 import javax.activation.DataSource;
  27 
  28 /**
  29 * A Universe Data Source useable by the activation framework.  This is a 
  30 * lightweight implementation.  It is not valid until init(...) is called.
  31 *
  32 * @author Erich P. Gatejen
  33 * @version 1.0
  34 * <i>Version History</i>
  35 * <code>EPG - New - 8Aug03</code> 
  36 * 
  37 */
  38 public class UniverseDataSource implements DataSource {
  39 
  40 	/**
  41 	 * Name of this universe object.
  42 	 */
  43 	public String name;
  44 
  45 	/**
  46 	 * Owning universe.
  47 	 */
  48 	public Universe uni;
  49 
  50 	/**
  51 	 *  Default Constructor.
  52 	 */
  53 	public UniverseDataSource() {
  54 
  55 	}
  56 
  57 	/**
  58 	 *  Initializer.
  59 	 * @param uniObj name of the universe object to source. 
  60 	 * @param u the universe to source from.
  61 	 */
  62 	public void init(String uniObj, Universe u) {
  63 		name = uniObj;
  64 		uni = u;
  65 	}
  66 
  67 	/**
  68 	 * Get the InputStream for this source.
  69 	 * @return The input stream
  70 	 */
  71 	public java.io.InputStream getInputStream() throws java.io.IOException {
  72 		InputStream result = null;
  73 		try {
  74 			result = uni.getStream(name);
  75 		} catch (UniverseException e) {
  76 			IOException ioe = new IOException(e.numeric + ":" + e.getMessage());
  77 			ioe.initCause(e);
  78 			throw ioe;
  79 		}
  80 		return result;
  81 	}
  82 
  83 	/**
  84 	 * Get the OutStream for this source.
  85 	 * This implementation doesn't support this.
  86 	 * @return The input stream
  87 	 */
  88 	public java.io.OutputStream getOutputStream() throws java.io.IOException {
  89 		throw new IOException("UniverseDataSource does not support getOutputStream().");
  90 	}
  91 
  92 	/**
  93 	 * Get the content type.  LIE!  We'll always say an octet stream.
  94 	 * @return the type
  95 	 */
  96 	public java.lang.String getContentType() {
  97 		return "application/octet-stream";
  98 	}
  99 
 100 	/**
 101 	 * Get the underlying object descriptor.
 102 	 * @return the type
 103 	 */
 104 	public java.lang.String getName() {
 105 		return name;
 106 	}
 107 
 108 }