/* * Copyright (c) 1999, 2002, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.sound.midi.spi; import java.io.File;import java.io.InputStream;import java.io.IOException;import java.net.URL; import javax.sound.midi.MidiFileFormat;import javax.sound.midi.Sequence;import javax.sound.midi.InvalidMidiDataException; /** * A <code>MidiFileReader</code> 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 <code>Sequence</code> object from files of these types. * * @author Kara Kytle * @since 1.3 */public abstract class MidiFileReader {     /**     * 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 <code>IOException</code>.     * @param stream the input stream from which file format information should be     * extracted     * @return a <code>MidiFileFormat</code> object describing the MIDI file format     * @throws InvalidMidiDataException if the stream does not point to valid MIDI     * file data recognized by the system     * @throws IOException if an I/O exception occurs     * @see InputStream#markSupported     * @see InputStream#mark     */    public abstract MidiFileFormat getMidiFileFormat(InputStream stream) throws InvalidMidiDataException, IOException;      /**     * Obtains the MIDI file format of the URL provided.  The URL must     * point to valid MIDI file data.     * @param url the URL from which file format information should be     * extracted     * @return a <code>MidiFileFormat</code> object describing the MIDI file format     * @throws InvalidMidiDataException if the URL does not point to valid MIDI     * file data recognized by the system     * @throws IOException if an I/O exception occurs     */    public abstract MidiFileFormat getMidiFileFormat(URL url) throws InvalidMidiDataException, IOException;      /**     * Obtains the MIDI file format of the <code>File</code> provided.     * The <code>File</code> must point to valid MIDI file data.     * @param file the <code>File</code> from which file format information should be     * extracted     * @return a <code>MidiFileFormat</code> object describing the MIDI file format     * @throws InvalidMidiDataException if the <code>File</code> does not point to valid MIDI     * file data recognized by the system     * @throws IOException if an I/O exception occurs     */    public abstract MidiFileFormat getMidiFileFormat(File file) 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.     * @param stream the input stream from which the <code>Sequence</code> should be     * constructed     * @return a <code>Sequence</code> 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     * @throws IOException if an I/O exception occurs     * @see InputStream#markSupported     * @see InputStream#mark     */    public abstract Sequence getSequence(InputStream stream) throws InvalidMidiDataException, IOException;      /**     * Obtains a MIDI sequence from the URL provided.  The URL must     * point to valid MIDI file data.     * @param url the URL for which the <code>Sequence</code> should be     * constructed     * @return a <code>Sequence</code> 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     * @throws IOException if an I/O exception occurs     */    public abstract Sequence getSequence(URL url) throws InvalidMidiDataException, IOException;      /**     * Obtains a MIDI sequence from the <code>File</code> provided.  The <code>File</code> must     * point to valid MIDI file data.     * @param file the <code>File</code> from which the <code>Sequence</code> should be     * constructed     * @return a <code>Sequence</code> object based on the MIDI file data pointed     * to by the <code>File</code>     * @throws InvalidMidiDataException if the <code>File</code> does not point to valid MIDI     * file data recognized by the system     * @throws IOException if an I/O exception occurs     */    public abstract Sequence getSequence(File file) throws InvalidMidiDataException, IOException;}