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.InvalidMidiDataException;
29 import javax.sound.midi.ShortMessage;
30 
31 /**
32  * an optimized ShortMessage that does not need an array.
33  *
34  * @author Florian Bomers
35  */
36 final class FastShortMessage extends ShortMessage {
37     private int packedMsg;
38 
FastShortMessage(int packedMsg)39     FastShortMessage(int packedMsg) throws InvalidMidiDataException {
40         this.packedMsg = packedMsg;
41         getDataLength(packedMsg & 0xFF); // to check for validity
42     }
43 
44     /** Creates a FastShortMessage from this ShortMessage */
FastShortMessage(ShortMessage msg)45     FastShortMessage(ShortMessage msg) {
46         this.packedMsg = msg.getStatus()
47             | (msg.getData1() << 8)
48             | (msg.getData2() << 16);
49     }
50 
getPackedMsg()51     int getPackedMsg() {
52         return packedMsg;
53     }
54 
55     @Override
getMessage()56     public byte[] getMessage() {
57         int length = 0;
58         try {
59             // fix for bug 4851018: MidiMessage.getLength and .getData return wrong values
60             // fix for bug 4890405: Reading MidiMessage byte array fails in 1.4.2
61             length = getDataLength(packedMsg & 0xFF) + 1;
62         } catch (InvalidMidiDataException imde) {
63             // should never happen
64         }
65         byte[] returnedArray = new byte[length];
66         if (length>0) {
67             returnedArray[0] = (byte) (packedMsg & 0xFF);
68             if (length>1) {
69                 returnedArray[1] = (byte) ((packedMsg & 0xFF00) >> 8);
70                 if (length>2) {
71                     returnedArray[2] = (byte) ((packedMsg & 0xFF0000) >> 16);
72                 }
73             }
74         }
75         return returnedArray;
76     }
77 
78     @Override
getLength()79     public int getLength() {
80         try {
81             return getDataLength(packedMsg & 0xFF) + 1;
82         } catch (InvalidMidiDataException imde) {
83             // should never happen
84         }
85         return 0;
86     }
87 
88     @Override
setMessage(int status)89     public void setMessage(int status) throws InvalidMidiDataException {
90         // check for valid values
91         int dataLength = getDataLength(status); // can throw InvalidMidiDataException
92         if (dataLength != 0) {
93             super.setMessage(status); // throws Exception
94         }
95         packedMsg = (packedMsg & 0xFFFF00) | (status & 0xFF);
96     }
97 
98     @Override
setMessage(int status, int data1, int data2)99     public void setMessage(int status, int data1, int data2) throws InvalidMidiDataException {
100         getDataLength(status); // can throw InvalidMidiDataException
101         packedMsg = (status & 0xFF) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);
102     }
103 
104     @Override
setMessage(int command, int channel, int data1, int data2)105     public void setMessage(int command, int channel, int data1, int data2) throws InvalidMidiDataException {
106         getDataLength(command); // can throw InvalidMidiDataException
107         packedMsg = (command & 0xF0) | (channel & 0x0F) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);
108     }
109 
110     @Override
getChannel()111     public int getChannel() {
112         return packedMsg & 0x0F;
113     }
114 
115     @Override
getCommand()116     public int getCommand() {
117         return packedMsg & 0xF0;
118     }
119 
120     @Override
getData1()121     public int getData1() {
122         return (packedMsg & 0xFF00) >> 8;
123     }
124 
125     @Override
getData2()126     public int getData2() {
127         return (packedMsg & 0xFF0000) >> 16;
128     }
129 
130     @Override
getStatus()131     public int getStatus() {
132         return packedMsg & 0xFF;
133     }
134 
135     /**
136      * Creates a new object of the same class and with the same contents
137      * as this object.
138      * @return a clone of this instance.
139      */
140     @Override
clone()141     public Object clone() {
142         try {
143             return new FastShortMessage(packedMsg);
144         } catch (InvalidMidiDataException imde) {
145             // should never happen
146         }
147         return null;
148     }
149 
150 } // class FastShortMsg
151