/*
 * @(#)Patch.java	1.12 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

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;
    }
}

