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Class ShortMessage

java.lang.Object
- javax.sound.midi.MidiMessage
- - javax.sound.midi.ShortMessage

All Implemented Interfaces:: Cloneable

public class ShortMessage
extends MidiMessage

A ShortMessage contains a MIDI message that has at most two data bytes following its status byte. The types of MIDI message that satisfy this criterion are channel voice, channel mode, system common, and system real-time--in other words, everything except system exclusive and meta-events. The ShortMessage class provides methods for getting and setting the contents of the MIDI message.

A number of ShortMessage methods have integer parameters by which you specify a MIDI status or data byte. If you know the numeric value, you can express it directly. For system common and system real-time messages, you can often use the corresponding fields of ShortMessage, such as SYSTEM_RESET. For channel messages, the upper four bits of the status byte are specified by a command value and the lower four bits are specified by a MIDI channel number. To convert incoming MIDI data bytes that are in the form of Java's signed bytes, you can use the conversion code given in the MidiMessage class description.

See Also:: SysexMessage, MetaMessage

Fields

MIDI_TIME_CODE

public static final int MIDI_TIME_CODE

Status byte for MIDI Time Code Quarter Frame message (0xF1, or 241).

See Also:: MidiMessage.getStatus(), Constant Field Values

SONG_POSITION_POINTER

public static final int SONG_POSITION_POINTER

Status byte for Song Position Pointer message (0xF2, or 242).

See Also:: MidiMessage.getStatus(), Constant Field Values

SONG_SELECT

public static final int SONG_SELECT

Status byte for MIDI Song Select message (0xF3, or 243).

See Also:: MidiMessage.getStatus(), Constant Field Values

TUNE_REQUEST

public static final int TUNE_REQUEST

Status byte for Tune Request message (0xF6, or 246).

See Also:: MidiMessage.getStatus(), Constant Field Values

END_OF_EXCLUSIVE

public static final int END_OF_EXCLUSIVE

Status byte for End of System Exclusive message (0xF7, or 247).

See Also:: MidiMessage.getStatus(), Constant Field Values

TIMING_CLOCK

public static final int TIMING_CLOCK

Status byte for Timing Clock message (0xF8, or 248).

See Also:: MidiMessage.getStatus(), Constant Field Values

START

public static final int START

Status byte for Start message (0xFA, or 250).

See Also:: MidiMessage.getStatus(), Constant Field Values

CONTINUE

public static final int CONTINUE

Status byte for Continue message (0xFB, or 251).

See Also:: MidiMessage.getStatus(), Constant Field Values

STOP

public static final int STOP

Status byte for Stop message (0xFC, or 252).

See Also:: MidiMessage.getStatus(), Constant Field Values

ACTIVE_SENSING

public static final int ACTIVE_SENSING

Status byte for Active Sensing message (0xFE, or 254).

See Also:: MidiMessage.getStatus(), Constant Field Values

SYSTEM_RESET

public static final int SYSTEM_RESET

Status byte for System Reset message (0xFF, or 255).

See Also:: MidiMessage.getStatus(), Constant Field Values

NOTE_OFF

public static final int NOTE_OFF

Command value for Note Off message (0x80, or 128)

NOTE_ON

public static final int NOTE_ON

Command value for Note On message (0x90, or 144)

POLY_PRESSURE

public static final int POLY_PRESSURE

Command value for Polyphonic Key Pressure (Aftertouch) message (0xA0, or 160)

CONTROL_CHANGE

public static final int CONTROL_CHANGE

Command value for Control Change message (0xB0, or 176)

PROGRAM_CHANGE

public static final int PROGRAM_CHANGE

Command value for Program Change message (0xC0, or 192)

CHANNEL_PRESSURE

public static final int CHANNEL_PRESSURE

Command value for Channel Pressure (Aftertouch) message (0xD0, or 208)

PITCH_BEND

public static final int PITCH_BEND

Command value for Pitch Bend message (0xE0, or 224)

Constructors

ShortMessage

public ShortMessage()

Constructs a new ShortMessage. The contents of the new message are guaranteed to specify a valid MIDI message. Subsequently, you may set the contents of the message using one of the setMessage methods.

See Also:: setMessage(int)

ShortMessage

public ShortMessage(int status)
             throws InvalidMidiDataException

Constructs a new ShortMessage which represents a MIDI message that takes no data bytes. The contents of the message can be changed by using one of the setMessage methods.

Parameters:: status - the MIDI status byte
Throws:: InvalidMidiDataException - if status does not specify a valid MIDI status byte for a message that requires no data bytes
Since:: 1.7
See Also:: setMessage(int), setMessage(int, int, int), setMessage(int, int, int, int), MidiMessage.getStatus()

ShortMessage

public ShortMessage(int status,
                    int data1,
                    int data2)
             throws InvalidMidiDataException

Constructs a new ShortMessage which represents a MIDI message that takes up to two data bytes. If the message only takes one data byte, the second data byte is ignored. If the message does not take any data bytes, both data bytes are ignored. The contents of the message can be changed by using one of the setMessage methods.

Parameters:: status - the MIDI status byte; data1 - the first data byte; data2 - the second data byte
Throws:: InvalidMidiDataException - if the status byte or all data bytes belonging to the message do not specify a valid MIDI message
Since:: 1.7
See Also:: setMessage(int), setMessage(int, int, int), setMessage(int, int, int, int), MidiMessage.getStatus(), getData1(), getData2()

ShortMessage

public ShortMessage(int command,
                    int channel,
                    int data1,
                    int data2)
             throws InvalidMidiDataException

Constructs a new ShortMessage which represents a channel MIDI message that takes up to two data bytes. If the message only takes one data byte, the second data byte is ignored. If the message does not take any data bytes, both data bytes are ignored. The contents of the message can be changed by using one of the setMessage methods.

Parameters:: command - the MIDI command represented by this message; channel - the channel associated with the message; data1 - the first data byte; data2 - the second data byte
Throws:: InvalidMidiDataException - if the command value, channel value or all data bytes belonging to the message do not specify a valid MIDI message
Since:: 1.7
See Also:: setMessage(int), setMessage(int, int, int), setMessage(int, int, int, int), getCommand(), getChannel(), getData1(), getData2()

ShortMessage

protected ShortMessage(byte[] data)

Constructs a new ShortMessage.

Parameters:: data - an array of bytes containing the complete message. The message data may be changed using the setMessage method.
See Also:: setMessage(int)

Methods

setMessage

public void setMessage(int status)
                throws InvalidMidiDataException

Sets the parameters for a MIDI message that takes no data bytes.

Parameters:: status - the MIDI status byte
Throws:: InvalidMidiDataException - if status does not specify a valid MIDI status byte for a message that requires no data bytes.
See Also:: setMessage(int, int, int), setMessage(int, int, int, int)

setMessage

public void setMessage(int status,
                       int data1,
                       int data2)
                throws InvalidMidiDataException

Sets the parameters for a MIDI message that takes one or two data bytes. If the message takes only one data byte, the second data byte is ignored; if the message does not take any data bytes, both data bytes are ignored.

Parameters:: status - the MIDI status byte; data1 - the first data byte; data2 - the second data byte
Throws:: InvalidMidiDataException - if the the status byte, or all data bytes belonging to the message, do not specify a valid MIDI message.
See Also:: setMessage(int, int, int, int), setMessage(int)

setMessage

public void setMessage(int command,
                       int channel,
                       int data1,
                       int data2)
                throws InvalidMidiDataException

Sets the short message parameters for a channel message which takes up to two data bytes. If the message only takes one data byte, the second data byte is ignored; if the message does not take any data bytes, both data bytes are ignored.

Parameters:: command - the MIDI command represented by this message; channel - the channel associated with the message; data1 - the first data byte; data2 - the second data byte
Throws:: InvalidMidiDataException - if the status byte or all data bytes belonging to the message, do not specify a valid MIDI message
See Also:: setMessage(int, int, int), setMessage(int), getCommand(), getChannel(), getData1(), getData2()

getChannel

public int getChannel()

Obtains the MIDI channel associated with this event. This method assumes that the event is a MIDI channel message; if not, the return value will not be meaningful.

Returns:: MIDI channel associated with the message.
See Also:: setMessage(int, int, int, int)

getCommand

public int getCommand()

Obtains the MIDI command associated with this event. This method assumes that the event is a MIDI channel message; if not, the return value will not be meaningful.

Returns:: the MIDI command associated with this event
See Also:: setMessage(int, int, int, int)

getData1

public int getData1()

Obtains the first data byte in the message.

Returns:: the value of the data1 field
See Also:: setMessage(int, int, int)

getData2

public int getData2()

Obtains the second data byte in the message.

Returns:: the value of the data2 field
See Also:: setMessage(int, int, int)

clone

public Object clone()

Creates a new object of the same class and with the same contents as this object.

Specified by:: clone in class MidiMessage
Returns:: a clone of this instance.
See Also:: Cloneable

getDataLength

protected final int getDataLength(int status)
                           throws InvalidMidiDataException

Retrieves the number of data bytes associated with a particular status byte value.

Parameters:: status - status byte value, which must represent a short MIDI message
Returns:: data length in bytes (0, 1, or 2)
Throws:: InvalidMidiDataException - if the status argument does not represent the status byte for any short message

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