1 /*
   2  * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.media.sound;
  27 
  28 import javax.sound.midi.*;
  29 
  30 /**
  31  * an optimized ShortMessage that does not need an array
  32  *
  33  * @author Florian Bomers
  34  */
  35 final class FastShortMessage extends ShortMessage {
  36     private int packedMsg;
  37 
  38     FastShortMessage(int packedMsg) throws InvalidMidiDataException {
  39         this.packedMsg = packedMsg;
  40         getDataLength(packedMsg & 0xFF); // to check for validity
  41     }
  42 
  43     /** Creates a FastShortMessage from this ShortMessage */
  44     FastShortMessage(ShortMessage msg) {
  45         this.packedMsg = msg.getStatus()
  46             | (msg.getData1() << 8)
  47             | (msg.getData2() << 16);
  48     }
  49 
  50     int getPackedMsg() {
  51         return packedMsg;
  52     }
  53 
  54     public byte[] getMessage() {
  55         int length = 0;
  56         try {
  57             // fix for bug 4851018: MidiMessage.getLength and .getData return wrong values
  58             // fix for bug 4890405: Reading MidiMessage byte array fails in 1.4.2
  59             length = getDataLength(packedMsg & 0xFF) + 1;
  60         } catch (InvalidMidiDataException imde) {
  61             // should never happen
  62         }
  63         byte[] returnedArray = new byte[length];
  64         if (length>0) {
  65             returnedArray[0] = (byte) (packedMsg & 0xFF);
  66             if (length>1) {
  67                 returnedArray[1] = (byte) ((packedMsg & 0xFF00) >> 8);
  68                 if (length>2) {
  69                     returnedArray[2] = (byte) ((packedMsg & 0xFF0000) >> 16);
  70                 }
  71             }
  72         }
  73         return returnedArray;
  74     }
  75 
  76     public int getLength() {
  77         try {
  78             return getDataLength(packedMsg & 0xFF) + 1;
  79         } catch (InvalidMidiDataException imde) {
  80             // should never happen
  81         }
  82         return 0;
  83     }
  84 
  85     public void setMessage(int status) throws InvalidMidiDataException {
  86         // check for valid values
  87         int dataLength = getDataLength(status); // can throw InvalidMidiDataException
  88         if (dataLength != 0) {
  89             super.setMessage(status); // throws Exception
  90         }
  91         packedMsg = (packedMsg & 0xFFFF00) | (status & 0xFF);
  92     }
  93 
  94 
  95     public void setMessage(int status, int data1, int data2) throws InvalidMidiDataException {
  96         getDataLength(status); // can throw InvalidMidiDataException
  97         packedMsg = (status & 0xFF) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);
  98     }
  99 
 100 
 101     public void setMessage(int command, int channel, int data1, int data2) throws InvalidMidiDataException {
 102         getDataLength(command); // can throw InvalidMidiDataException
 103         packedMsg = (command & 0xF0) | (channel & 0x0F) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);
 104     }
 105 
 106 
 107     public int getChannel() {
 108         return packedMsg & 0x0F;
 109     }
 110 
 111     public int getCommand() {
 112         return packedMsg & 0xF0;
 113     }
 114 
 115     public int getData1() {
 116         return (packedMsg & 0xFF00) >> 8;
 117     }
 118 
 119     public int getData2() {
 120         return (packedMsg & 0xFF0000) >> 16;
 121     }
 122 
 123     public int getStatus() {
 124         return packedMsg & 0xFF;
 125     }
 126 
 127     /**
 128      * Creates a new object of the same class and with the same contents
 129      * as this object.
 130      * @return a clone of this instance.
 131      */
 132     public Object clone() {
 133         try {
 134             return new FastShortMessage(packedMsg);
 135         } catch (InvalidMidiDataException imde) {
 136             // should never happen
 137         }
 138         return null;
 139     }
 140 
 141 } // class FastShortMsg