/* * Copyright (c) 1999, 2010, 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;  /** * A <code>Transmitter</code> sends <code>{@link MidiEvent}</code> objects to one or more * <code>{@link Receiver Receivers}</code>. Common MIDI transmitters include sequencers * and MIDI input ports. * * @see Receiver * * @author Kara Kytle */public interface Transmitter extends AutoCloseable {      /**     * Sets the receiver to which this transmitter will deliver MIDI messages.     * If a receiver is currently set, it is replaced with this one.     * @param receiver the desired receiver.     */    public void setReceiver(Receiver receiver);      /**     * Obtains the current receiver to which this transmitter will deliver MIDI messages.     * @return the current receiver.  If no receiver is currently set,     * returns <code>null</code>     */    public Receiver getReceiver();      /**     * Indicates that the application has finished using the transmitter, and     * that limited resources it requires may be released or made available.     *     * <p>If the creation of this <code>Transmitter</code> resulted in     * implicitly opening the underlying device, the device is     * implicitly closed by this method. This is true unless the device is     * kept open by other <code>Receiver</code> or <code>Transmitter</code>     * instances that opened the device implicitly, and unless the device     * has been opened explicitly. If the device this     * <code>Transmitter</code> is retrieved from is closed explicitly     * by calling {@link MidiDevice#close MidiDevice.close}, the     * <code>Transmitter</code> is closed, too.  For a detailed     * description of open/close behaviour see the class description     * of {@link javax.sound.midi.MidiDevice MidiDevice}.     *     * @see javax.sound.midi.MidiSystem#getTransmitter     */    public void close();}