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jeremybenn |
/* MidiMessage.java -- base class for MIDI messages.
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Copyright (C) 2005 Free Software Foundation, Inc.
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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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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 javax.sound.midi;
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/**
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* The base class for all MIDI messages.
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*
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* @author Anthony Green (green@redhat.com)
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* @since 1.3
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*
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*/
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public abstract class MidiMessage implements Cloneable
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{
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/**
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* MIDI message data.
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*/
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protected byte data[];
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/**
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* The total length of the MIDI message.
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*/
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protected int length;
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/**
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* MidiMessage contructor.
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*
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* @param data a valid MIDI message
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*/
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protected MidiMessage(byte[] data)
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{
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this.data = data;
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this.length = data.length;
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}
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/**
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* Set the complete MIDI message.
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*
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* @param data The complete MIDI message.
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* @param length The length of the MIDI message.
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* @throws InvalidMidiDataException Thrown when the MIDI message is invalid.
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*/
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protected void setMessage(byte[] data, int length)
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throws InvalidMidiDataException
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{
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this.data = new byte[length];
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System.arraycopy(data, 0, this.data, 0, length);
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this.length = length;
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}
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/**
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* Get the MIDI message data.
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*
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* @return an array containing the MIDI message data
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*/
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public byte[] getMessage()
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{
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byte copy[] = new byte[length];
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System.arraycopy(data, 0, copy, 0, length);
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return copy;
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}
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/**
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* Get the status byte of the MIDI message (as an int)
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*
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* @return the status byte of the MIDI message (as an int), or zero if the message length is zero.
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*/
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public int getStatus()
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{
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if (length > 0)
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return (data[0] & 0xff);
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else
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return 0;
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}
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/**
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* Get the length of the MIDI message.
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*
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* @return the length of the MIDI messsage
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*/
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public int getLength()
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{
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return length;
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}
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/* Create a clone of this object.
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*
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* @see java.lang.Object#clone()
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*/
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public abstract Object clone();
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}
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