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
26package com.sun.media.sound;
27
28import javax.sound.midi.InvalidMidiDataException;
29import javax.sound.midi.ShortMessage;
30
31/**
32 * an optimized ShortMessage that does not need an array.
33 *
34 * @author Florian Bomers
35 */
36final class FastShortMessage extends ShortMessage {
37    private int packedMsg;
38
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 */
45    FastShortMessage(ShortMessage msg) {
46        this.packedMsg = msg.getStatus()
47            | (msg.getData1() << 8)
48            | (msg.getData2() << 16);
49    }
50
51    int getPackedMsg() {
52        return packedMsg;
53    }
54
55    @Override
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
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
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
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
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
111    public int getChannel() {
112        return packedMsg & 0x0F;
113    }
114
115    @Override
116    public int getCommand() {
117        return packedMsg & 0xF0;
118    }
119
120    @Override
121    public int getData1() {
122        return (packedMsg & 0xFF00) >> 8;
123    }
124
125    @Override
126    public int getData2() {
127        return (packedMsg & 0xFF0000) >> 16;
128    }
129
130    @Override
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
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