/*
 * Copyright (c) 1999, 2002, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.sound.midi.spi;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;

import javax.sound.midi.Sequence;
import javax.sound.midi.MidiFileFormat;

/**
 * A <code>MidiFileWriter</code> supplies MIDI file-writing services.  Classes
 * that implement this interface can write one or more types of MIDI file from
 * a <code>{@link Sequence}</code> object.
 *
 * @author Kara Kytle
 * @since 1.3
 */
public abstract class MidiFileWriter {


    /**
     * Obtains the set of MIDI file types for which file writing support is
     * provided by this file writer.
     * @return array of file types.  If no file types are supported,
     * an array of length 0 is returned.
     */
    public abstract int[] getMidiFileTypes();


    /**
     * Obtains the file types that this file writer can write from the
     * sequence specified.
     * @param sequence the sequence for which MIDI file type support
     * is queried
     * @return array of file types.  If no file types are supported,
     * returns an array of length 0.
     */
    public abstract int[] getMidiFileTypes(Sequence sequence);


    /**
     * Indicates whether file writing support for the specified MIDI file type
     * is provided by this file writer.
     * @param fileType the file type for which write capabilities are queried
     * @return <code>true</code> if the file type is supported,
     * otherwise <code>false</code>
     */
    public boolean isFileTypeSupported(int fileType) {

        int types[] = getMidiFileTypes();
        for(int i=0; i<types.length; i++) {
            if( fileType == types[i] ) {
                return true;
            }
        }
        return false;
    }


    /**
     * Indicates whether a MIDI file of the file type specified can be written
     * from the sequence indicated.
     * @param fileType the file type for which write capabilities are queried
     * @param sequence  the sequence for which file writing support is queried
     * @return <code>true</code> if the file type is supported for this sequence,
     * otherwise <code>false</code>
     */
    public boolean isFileTypeSupported(int fileType, Sequence sequence) {

        int types[] = getMidiFileTypes( sequence );
        for(int i=0; i<types.length; i++) {
            if( fileType == types[i] ) {
                return true;
            }
        }
        return false;
    }


    /**
     * Writes a stream of bytes representing a MIDI file of the file type
     * indicated to the output stream provided.
     * @param in sequence containing MIDI data to be written to the file
     * @param fileType type of the file to be written to the output stream
     * @param out stream to which the file data should be written
     * @return the number of bytes written to the output stream
     * @throws IOException if an I/O exception occurs
     * @throws IllegalArgumentException if the file type is not supported by
     * this file writer
     * @see #isFileTypeSupported(int, Sequence)
     * @see     #getMidiFileTypes(Sequence)
     */
    public abstract int write(Sequence in, int fileType, OutputStream out) throws IOException;


    /**
     * Writes a stream of bytes representing a MIDI file of the file type
     * indicated to the external file provided.
     * @param in sequence containing MIDI data to be written to the external file
     * @param fileType type of the file to be written to the external file
     * @param out external file to which the file data should be written
     * @return the number of bytes written to the file
     * @throws IOException if an I/O exception occurs
     * @throws IllegalArgumentException if the file type is not supported by
     * this file writer
     * @see #isFileTypeSupported(int, Sequence)
     * @see     #getMidiFileTypes(Sequence)
     */
    public abstract int write(Sequence in, int fileType, File out) throws IOException;
}