Source for gnu.classpath.jdwp.util.Location

   1: /* Location.java -- class to read/write JDWP locations
   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: 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: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.classpath.jdwp.util;
  40: 
  41: import gnu.classpath.jdwp.VMIdManager;
  42: import gnu.classpath.jdwp.exception.JdwpException;
  43: import gnu.classpath.jdwp.id.ClassReferenceTypeId;
  44: import gnu.classpath.jdwp.id.ObjectId;
  45: 
  46: import java.io.DataOutputStream;
  47: import java.io.IOException;
  48: import java.lang.reflect.Method;
  49: import java.nio.ByteBuffer;
  50: 
  51: /**
  52:  * A class to read/write JDWP locations.
  53:  * 
  54:  * @author Aaron Luchko <aluchko@redhat.com>
  55:  */
  56: public class Location
  57: {
  58: 
  59:   private ClassReferenceTypeId crti;
  60: 
  61:   private int index;
  62: 
  63:   private byte tag;
  64: 
  65:   private ObjectId mid;
  66: 
  67:   /**
  68:    * Create a location with the given parameters.
  69:    * 
  70:    * @param tag the type of construct the location is in
  71:    * @param clazz the class the location is in
  72:    * @param meth the Method
  73:    * @param index location in the method
  74:    * @throws JdwpException
  75:    */
  76:   public Location(byte tag, Class clazz, Method meth, int index)
  77:       throws JdwpException
  78:   {
  79:     this.tag = tag;
  80:     this.crti = 
  81:       (ClassReferenceTypeId) VMIdManager.getDefault().getReferenceTypeId(clazz);
  82:     this.mid = VMIdManager.getDefault().getObjectId(meth);
  83:     this.index = index;
  84:   }
  85: 
  86:   /**
  87:    * Read a location from the given bytebuffer, consists of a TAG (byte),
  88:    * followed by a ReferenceTypeId, a MethodId and an index (int).
  89:    * 
  90:    * @param bb this holds the location
  91:    * @throws IOException
  92:    * @throws JdwpException
  93:    */
  94:   public Location(ByteBuffer bb) throws IOException, JdwpException
  95:   {
  96:     this.tag = bb.get();
  97:     this.crti = 
  98:       (ClassReferenceTypeId) VMIdManager.getDefault().readReferenceTypeId(bb);
  99:     this.mid = VMIdManager.getDefault().readObjectId(bb);
 100:     this.index = bb.getInt();
 101:   }
 102: 
 103:   /**
 104:    * Write the given location to an output stream.
 105:    * 
 106:    * @param os stream to write to
 107:    * @throws IOException
 108:    */
 109:   public void write(DataOutputStream os) throws IOException
 110:   {
 111:     os.writeByte(tag);
 112:     crti.write(os);
 113:     mid.write(os);
 114:     os.writeInt(index);
 115:   }
 116: }