001 /* SysexMessage.java -- System Exclusive MIDI message. 002 Copyright (C) 2005 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package javax.sound.midi; 040 041 /** 042 * A system exclusive MIDI message. 043 * 044 * @author Anthony Green (green@redhat.com) 045 * @since 1.3 046 * 047 */ 048 public class SysexMessage extends MidiMessage 049 { 050 public static final int SYSTEM_EXCLUSIVE = 0xF0; 051 052 public static final int SPECIAL_SYSTEM_EXCLUSIVE = 0xF7; 053 054 /** 055 * Create a default valid system exclusive message. 056 * 057 * The official specs don't specify what message is to be 058 * created. Our implementation creates an empty 059 * system exclusive message. 060 */ 061 public SysexMessage() 062 { 063 super(new byte[2]); 064 data[0] = (byte) SYSTEM_EXCLUSIVE; 065 data[1] = (byte) ShortMessage.END_OF_EXCLUSIVE; 066 } 067 068 /** 069 * Create a SysexMessage object. 070 * @param data a complete system exclusive message 071 */ 072 protected SysexMessage(byte[] data) 073 { 074 super(data); 075 } 076 077 /** 078 * Set the sysex message. The first data byte (status) must be 079 * 0xF0 or 0xF7. 080 * 081 * @param data the message data 082 * @param length the length of the message data 083 * @throws InvalidMidiDataException if the status byte is not 0xF0 or 0xF7 084 */ 085 public void setMessage(byte[] data, int length) 086 throws InvalidMidiDataException 087 { 088 if (data[0] != SYSTEM_EXCLUSIVE 089 && data[0] != SPECIAL_SYSTEM_EXCLUSIVE) 090 throw new InvalidMidiDataException("Sysex message starts with 0x" 091 + Integer.toHexString(data[0]) 092 + " instead of 0xF0 or 0xF7"); 093 super.setMessage(data, length); 094 } 095 096 /** 097 * Set the sysex message. status must be either 0xF0 or 0xF7. 098 * 099 * @param status the sysex statys byte (0xF0 or 0xF7) 100 * @param data the message data 101 * @param length the length of the message data 102 * @throws InvalidMidiDataException if status is not 0xF0 or 0xF7 103 */ 104 public void setMessage(int status, byte[] data, int length) 105 throws InvalidMidiDataException 106 { 107 if (status != SYSTEM_EXCLUSIVE 108 && status != SPECIAL_SYSTEM_EXCLUSIVE) 109 throw new InvalidMidiDataException("Sysex message starts with 0x" 110 + Integer.toHexString(status) 111 + " instead of 0xF0 or 0xF7"); 112 this.data = new byte[length+1]; 113 this.data[0] = (byte) status; 114 System.arraycopy(data, 0, this.data, 1, length); 115 this.length = length+1; 116 } 117 118 /** 119 * Get the data for this message, not including the status byte. 120 * @return the message data, not including the status byte 121 */ 122 public byte[] getData() 123 { 124 byte[] result = new byte[length - 1]; 125 System.arraycopy(data, 1, result, 0, length - 1); 126 return result; 127 } 128 129 /* Create a deep-copy clone of this object. 130 * @see java.lang.Object#clone() 131 */ 132 public Object clone() 133 { 134 byte message[] = new byte[length]; 135 System.arraycopy(data, 0, message, 0, length); 136 return new SysexMessage(message); 137 } 138 } 139