jdk/src/share/classes/javax/sound/midi/Patch.java

/*
 * Copyright 1999-2002 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package javax.sound.midi;


/**
 * A <code>Patch</code> object represents a location, on a MIDI
 * synthesizer, into which a single instrument is stored (loaded).
 * Every <code>Instrument</code> object has its own <code>Patch</code>
 * object that specifies the memory location
 * into which that instrument should be loaded. The
 * location is specified abstractly by a bank index and a program number (not by
 * any scheme that directly refers to a specific address or offset in RAM).
 * This is a hierarchical indexing scheme: MIDI provides for up to 16384 banks,
 * each of which contains up to 128 program locations.  For example, a
 * minimal sort of synthesizer might have only one bank of instruments, and
 * only 32 instruments (programs) in that bank.
 * <p>
 * To select what instrument should play the notes on a particular MIDI
 * channel, two kinds of MIDI message are used that specify a patch location:
 * a bank-select command, and a program-change channel command.  The Java Sound
 * equivalent is the
 * {@link MidiChannel#programChange(int, int) programChange(int, int)}
 * method of <code>MidiChannel</code>.
 *
 * @see Instrument
 * @see Instrument#getPatch()
 * @see MidiChannel#programChange(int, int)
 * @see Synthesizer#loadInstruments(Soundbank, Patch[])
 * @see Soundbank
 * @see Sequence#getPatchList()
 *
 * @author Kara Kytle
 */

public class Patch {


    /**
     * Bank index
     */
    private final int bank;


    /**
     * Program change number
     */
    private final int program;


    /**
     * Constructs a new patch object from the specified bank and program
     * numbers.
     * @param bank the bank index (in the range from 0 to 16383)
     * @param program the program index (in the range from 0 to 127)
     */
    public Patch(int bank, int program) {

        this.bank = bank;
        this.program = program;
    }


    /**
     * Returns the number of the bank that contains the instrument
     * whose location this <code>Patch</code> specifies.
     * @return the bank number, whose range is from 0 to 16383
     * @see MidiChannel#programChange(int, int)
     */
    public int getBank() {

        return bank;
    }


    /**
     * Returns the index, within
     * a bank, of the instrument whose location this <code>Patch</code> specifies.
     * @return the instrument's program number, whose range is from 0 to 127
     *
     * @see MidiChannel#getProgram
     * @see MidiChannel#programChange(int)
     * @see MidiChannel#programChange(int, int)
     */
    public int getProgram() {

        return program;
    }
}