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package com.sun.media.sound;

import javax.sound.midi.*;

an optimized ShortMessage that does not need an array
Author:Florian Bomers
/** * an optimized ShortMessage that does not need an array * * @author Florian Bomers */
final class FastShortMessage extends ShortMessage { private int packedMsg; FastShortMessage(int packedMsg) throws InvalidMidiDataException { this.packedMsg = packedMsg; getDataLength(packedMsg & 0xFF); // to check for validity }
Creates a FastShortMessage from this ShortMessage
/** Creates a FastShortMessage from this ShortMessage */
FastShortMessage(ShortMessage msg) { this.packedMsg = msg.getStatus() | (msg.getData1() << 8) | (msg.getData2() << 16); } int getPackedMsg() { return packedMsg; } public byte[] getMessage() { int length = 0; try { // fix for bug 4851018: MidiMessage.getLength and .getData return wrong values // fix for bug 4890405: Reading MidiMessage byte array fails in 1.4.2 length = getDataLength(packedMsg & 0xFF) + 1; } catch (InvalidMidiDataException imde) { // should never happen } byte[] returnedArray = new byte[length]; if (length>0) { returnedArray[0] = (byte) (packedMsg & 0xFF); if (length>1) { returnedArray[1] = (byte) ((packedMsg & 0xFF00) >> 8); if (length>2) { returnedArray[2] = (byte) ((packedMsg & 0xFF0000) >> 16); } } } return returnedArray; } public int getLength() { try { return getDataLength(packedMsg & 0xFF) + 1; } catch (InvalidMidiDataException imde) { // should never happen } return 0; } public void setMessage(int status) throws InvalidMidiDataException { // check for valid values int dataLength = getDataLength(status); // can throw InvalidMidiDataException if (dataLength != 0) { super.setMessage(status); // throws Exception } packedMsg = (packedMsg & 0xFFFF00) | (status & 0xFF); } public void setMessage(int status, int data1, int data2) throws InvalidMidiDataException { getDataLength(status); // can throw InvalidMidiDataException packedMsg = (status & 0xFF) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16); } public void setMessage(int command, int channel, int data1, int data2) throws InvalidMidiDataException { getDataLength(command); // can throw InvalidMidiDataException packedMsg = (command & 0xF0) | (channel & 0x0F) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16); } public int getChannel() { return packedMsg & 0x0F; } public int getCommand() { return packedMsg & 0xF0; } public int getData1() { return (packedMsg & 0xFF00) >> 8; } public int getData2() { return (packedMsg & 0xFF0000) >> 16; } public int getStatus() { return packedMsg & 0xFF; }
Creates a new object of the same class and with the same contents as this object.
Returns:a clone of this instance.
/** * Creates a new object of the same class and with the same contents * as this object. * @return a clone of this instance. */
public Object clone() { try { return new FastShortMessage(packedMsg); } catch (InvalidMidiDataException imde) { // should never happen } return null; } } // class FastShortMsg