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jeremybenn |
/* JdwpCommandPacket.java -- JDWP command packet
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Copyright (C) 2005 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.jdwp.transport;
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import java.io.DataOutputStream;
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import java.io.IOException;
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/**
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* A class representing a JDWP command packet.
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* This class adds command set and command to the packet header
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* information in {@link gnu.classpath.jdwp.transport.JdwpPacket}
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* and adds additional command packet-specific processing.
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*
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* @author Keith Seitz <keiths@redhat.com>
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*/
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public class JdwpCommandPacket extends JdwpPacket
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{
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/**
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* Command set
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*/
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protected byte _commandSet;
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/**
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* Command
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*/
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protected byte _command;
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// Minimum packet size [excluding super class]
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// ( commandSet (1) + command (1) )
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private static final int MINIMUM_LENGTH = 2;
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/**
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* Constructs a new <code>JdwpCommandPacket</code>
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*/
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public JdwpCommandPacket ()
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{
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// Don't assign an id. This constructor is called by
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// JdwpPacket.fromBytes, and that will assign a packet id.
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}
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/**
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* Constructs a new <code>JdwpCommandPacket</code>
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* with the given command set and command
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*
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* @param set the command set
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* @param command the command
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*/
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public JdwpCommandPacket (byte set, byte command)
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{
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_id = ++_last_id;
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_commandSet = set;
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_command = command;
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}
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/**
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* Retuns the length of this packet
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*/
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public int getLength ()
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{
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return MINIMUM_LENGTH + super.getLength ();
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}
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/**
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* Returns the command set
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*/
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public byte getCommandSet ()
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{
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return _commandSet;
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}
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/**
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* Sets the command set
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*/
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public void setCommandSet (byte cs)
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{
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_commandSet = cs;
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}
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/**
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* Returns the command
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*/
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public byte getCommand ()
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{
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return _command;
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}
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/**
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* Sets the command
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*/
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public void setCommand (byte cmd)
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{
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_command = cmd;
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}
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// Reads command packet data from the given buffer, starting
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// at the given offset
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protected int myFromBytes (byte[] bytes, int index)
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{
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int i = 0;
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setCommandSet (bytes[index + i++]);
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setCommand (bytes[index + i++]);
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return i;
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}
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// Writes the command packet data into the given buffer
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protected void myWrite (DataOutputStream dos)
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throws IOException
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{
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dos.writeByte (getCommandSet ());
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dos.writeByte (getCommand ());
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}
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}
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