old-autovect-branch/libjava/classpath/gnu/classpath/jdwp/id/ReferenceTypeId.java

   1 /* ReferenceTypeId.java -- a base class for all reference type IDs
   2    Copyright (C) 2005 Free Software Foundation
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 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 terms of your choice, provided that you also meet, for each linked
  32 independent module, the terms and conditions of the license of that
  33 module.  An independent module is a module which is not derived from
  34 or based on this library.  If you modify this library, you may extend
  35 this exception to your version of the library, but you are not
  36 obligated to do so.  If you do not wish to do so, delete this
  37 exception statement from your version. */
  38
  39
  40 package gnu.classpath.jdwp.id;
  41
  42 import gnu.classpath.jdwp.exception.InvalidClassException;
  43
  44 import java.io.DataOutputStream;
  45 import java.io.IOException;
  46
  47 /**
  48  * Base class for reference type IDs. This class usurps
  49  * <code>JdwpId</code>'s tag member for its own use (type tag).
  50  *
  51  * @author Keith Seitz  <keiths@redhat.com>
  52  */
  53 public class ReferenceTypeId
  54   extends JdwpId
  55 {
  56   /**
  57    * Constructor used by {Array,Interface,Class}ReferenceTypeId
  58    */
  59   public ReferenceTypeId (byte tag)
  60   {
  61     super (tag);
  62   }
  63
  64   /**
  65    * Returns the size of this ID type
  66    */
  67   public int size ()
  68   {
  69     return 8;
  70   }
  71
  72   /**
  73    * Gets the class associated with this ID
  74    *
  75    * @returns the class
  76    * @throws InvalidClassException if the class is not valid
  77    */
  78   public Class getType ()
  79     throws InvalidClassException
  80   {
  81     Class clazz = (Class) _reference.get ();
  82     if (clazz == null)
  83       throw new InvalidClassException (_id);
  84
  85     return clazz;
  86   }
  87
  88   /**
  89    * Outputs the reference type ID to the given output stream
  90    *
  91    * @param  outStream    the stream to which to write the data
  92    * @throws IOException  for errors writing to the stream
  93    */
  94   public void write (DataOutputStream outStream)
  95     throws IOException
  96   {
  97     outStream.writeLong (_id);
  98   }
  99 }