Module java.desktop

Package javax.sound.midi.spi

Class MidiFileReader

java.lang.Object

javax.sound.midi.spi.MidiFileReader

public abstract class MidiFileReader
extends Object

A MidiFileReader supplies MIDI file-reading services. Classes implementing this interface can parse the format information from one or more types of MIDI file, and can produce a Sequence object from files of these types.

Since:

1.3

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	MidiFileReader()	Constructor for subclasses to call.

Method Summary

Modifier and Type	Method	Description
abstract MidiFileFormat	getMidiFileFormat(File file)	Obtains the MIDI file format of the File provided.
abstract MidiFileFormat	getMidiFileFormat(InputStream stream)	Obtains the MIDI file format of the input stream provided.
abstract MidiFileFormat	getMidiFileFormat(URL url)	Obtains the MIDI file format of the URL provided.
abstract Sequence	getSequence(File file)	Obtains a MIDI sequence from the File provided.
abstract Sequence	getSequence(InputStream stream)	Obtains a MIDI sequence from the input stream provided.
abstract Sequence	getSequence(URL url)	Obtains a MIDI sequence from the URL provided.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MidiFileReader

protected MidiFileReader()

Constructor for subclasses to call.

Method Details

getMidiFileFormat

public abstract MidiFileFormat getMidiFileFormat(InputStream stream)
                                          throws InvalidMidiDataException,
IOException

Obtains the MIDI file format of the input stream provided. The stream must point to valid MIDI file data. In general, MIDI file readers may need to read some data from the stream before determining whether they support it. These parsers must be able to mark the stream, read enough data to determine whether they support the stream, and, if not, reset the stream's read pointer to its original position. If the input stream does not support this, this method may fail with an IOException.

Parameters:

stream - the input stream from which file format information should be extracted

Returns:

a MidiFileFormat object describing the MIDI file format

Throws:

InvalidMidiDataException - if the stream does not point to valid MIDI file data recognized by the system

IOException - if an I/O exception occurs

NullPointerException - if stream is null

See Also:

• InputStream.markSupported()
• InputStream.mark(int)

getMidiFileFormat

public abstract MidiFileFormat getMidiFileFormat(URL url)
                                          throws InvalidMidiDataException,
IOException

Obtains the MIDI file format of the URL provided. The URL must point to valid MIDI file data.

Parameters:

url - the URL from which file format information should be extracted

Returns:

a MidiFileFormat object describing the MIDI file format

Throws:

InvalidMidiDataException - if the URL does not point to valid MIDI file data recognized by the system

IOException - if an I/O exception occurs

NullPointerException - if url is null

getMidiFileFormat

public abstract MidiFileFormat getMidiFileFormat(File file)
                                          throws InvalidMidiDataException,
IOException

Obtains the MIDI file format of the File provided. The File must point to valid MIDI file data.

Parameters:

file - the File from which file format information should be extracted

Returns:

a MidiFileFormat object describing the MIDI file format

Throws:

InvalidMidiDataException - if the File does not point to valid MIDI file data recognized by the system

IOException - if an I/O exception occurs

NullPointerException - if file is null

getSequence

public abstract Sequence getSequence(InputStream stream)
                              throws InvalidMidiDataException,
IOException

Obtains a MIDI sequence from the input stream provided. The stream must point to valid MIDI file data. In general, MIDI file readers may need to read some data from the stream before determining whether they support it. These parsers must be able to mark the stream, read enough data to determine whether they support the stream, and, if not, reset the stream's read pointer to its original position. If the input stream does not support this, this method may fail with an IOException.

Parameters:

stream - the input stream from which the Sequence should be constructed

Returns:

a Sequence object based on the MIDI file data contained in the input stream

Throws:

InvalidMidiDataException - if the stream does not point to valid MIDI file data recognized by the system

IOException - if an I/O exception occurs

NullPointerException - if stream is null

See Also:

• InputStream.markSupported()
• InputStream.mark(int)

getSequence

public abstract Sequence getSequence(URL url)
                              throws InvalidMidiDataException,
IOException

Obtains a MIDI sequence from the URL provided. The URL must point to valid MIDI file data.

Parameters:

url - the URL for which the Sequence should be constructed

Returns:

a Sequence object based on the MIDI file data pointed to by the URL

Throws:

InvalidMidiDataException - if the URL does not point to valid MIDI file data recognized by the system

IOException - if an I/O exception occurs

NullPointerException - if url is null

getSequence

public abstract Sequence getSequence(File file)
                              throws InvalidMidiDataException,
IOException

Obtains a MIDI sequence from the File provided. The File must point to valid MIDI file data.

Parameters:

file - the File from which the Sequence should be constructed

Returns:

a Sequence object based on the MIDI file data pointed to by the File

Throws:

InvalidMidiDataException - if the File does not point to valid MIDI file data recognized by the system

IOException - if an I/O exception occurs

NullPointerException - if file is null