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 * 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.

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 * 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).

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package javax.sound.midi;

import java.io.FileInputStream;

import java.io.File;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

import java.net.URL;

import javax.sound.midi.spi.MidiFileWriter;

import javax.sound.midi.spi.MidiFileReader;

import javax.sound.midi.spi.SoundbankReader;

import javax.sound.midi.spi.MidiDeviceProvider;

import com.sun.media.sound.JDK13Services;

import com.sun.media.sound.ReferenceCountingDevice;

import com.sun.media.sound.AutoConnectSequencer;

import com.sun.media.sound.MidiDeviceReceiverEnvelope;

import com.sun.media.sound.MidiDeviceTransmitterEnvelope;

/**

 * The <code>MidiSystem</code> class provides access to the installed MIDI

 * system resources, including devices such as synthesizers, sequencers, and

 * MIDI input and output ports.  A typical simple MIDI application might

 * begin by invoking one or more <code>MidiSystem</code> methods to learn

 * what devices are installed and to obtain the ones needed in that

 * application.

 * <p>

 * The class also has methods for reading files, streams, and  URLs that

 * contain standard MIDI file data or soundbanks.  You can query the

 * <code>MidiSystem</code> for the format of a specified MIDI file.

 * <p>

 * You cannot instantiate a <code>MidiSystem</code>; all the methods are

 * static.

 *

 * <p>Properties can be used to specify default MIDI devices.

 * Both system properties and a properties file are considered.

 * The properties file is "lib/sound.properties" in the JRE

 * directory. If a property exists both as a system property and in the

 * properties file, the system property takes precedence. If none is

 * specified, a suitable default is chosen among the available devices.

 * The syntax of the properties file is specified in

 * {@link java.util.Properties#load(InputStream) Properties.load}. The

 * following table lists the available property keys and which methods

 * consider them:

 *

 * <table border=0>

 *  <tr>

 *   <th>Property Key</th>

 *   <th>Interface</th>

 *   <th>Affected Method</th>

 *  </tr>

 *  <tr>

 *   <td><code>javax.sound.midi.Receiver</code></td>

 *   <td>{@link Receiver}</td>

 *   <td>{@link #getReceiver}</td>

 *  </tr>

 *  <tr>

 *   <td><code>javax.sound.midi.Sequencer</code></td>

 *   <td>{@link Sequencer}</td>

 *   <td>{@link #getSequencer}</td>

 *  </tr>

 *  <tr>

 *   <td><code>javax.sound.midi.Synthesizer</code></td>

 *   <td>{@link Synthesizer}</td>

 *   <td>{@link #getSynthesizer}</td>

 *  </tr>

 *  <tr>

 *   <td><code>javax.sound.midi.Transmitter</code></td>

 *   <td>{@link Transmitter}</td>

 *   <td>{@link #getTransmitter}</td>

 *  </tr>

 * </table>

 *

 * The property value consists of the provider class name

 * and the device name, separated by the hash mark ("#").

 * The provider class name is the fully-qualified

 * name of a concrete {@link javax.sound.midi.spi.MidiDeviceProvider

 * MIDI device provider} class. The device name is matched against

 * the <code>String</code> returned by the <code>getName</code>

 * method of <code>MidiDevice.Info</code>.

 * Either the class name, or the device name may be omitted.

 * If only the class name is specified, the trailing hash mark

 * is optional.

 *

 * <p>If the provider class is specified, and it can be

 * successully retrieved from the installed providers,

 * the list of

 * <code>MidiDevice.Info</code> objects is retrieved

 * from the provider. Otherwise, or when these devices

 * do not provide a subsequent match, the list is retrieved

 * from {@link #getMidiDeviceInfo} to contain

 * all available <code>MidiDevice.Info</code> objects.

 *

 * <p>If a device name is specified, the resulting list of

 * <code>MidiDevice.Info</code> objects is searched:

 * the first one with a matching name, and whose

 * <code>MidiDevice</code> implements the

 * respective interface, will be returned.

 * If no matching <code>MidiDevice.Info</code> object

 * is found, or the device name is not specified,

 * the first suitable device from the resulting

 * list will be returned. For Sequencer and Synthesizer,

 * a device is suitable if it implements the respective

 * interface; whereas for Receiver and Transmitter, a device is

 * suitable if it

 * implements neither Sequencer nor Synthesizer and provides

 * at least one Receiver or Transmitter, respectively.

 *

 * For example, the property <code>javax.sound.midi.Receiver</code>

 * with a value

 * <code>&quot;com.sun.media.sound.MidiProvider#SunMIDI1&quot;</code>

 * will have the following consequences when

 * <code>getReceiver</code> is called:

 * if the class <code>com.sun.media.sound.MidiProvider</code> exists

 * in the list of installed MIDI device providers,

 * the first <code>Receiver</code> device with name

 * <code>&quot;SunMIDI1&quot;</code> will be returned. If it cannot

 * be found, the first <code>Receiver</code> from that provider

 * will be returned, regardless of name.

 * If there is none, the first <code>Receiver</code> with name

 * <code>&quot;SunMIDI1&quot;</code> in the list of all devices

 * (as returned by <code>getMidiDeviceInfo</code>) will be returned,

 * or, if not found, the first <code>Receiver</code> that can

 * be found in the list of all devices is returned.

 * If that fails, too, a <code>MidiUnavailableException</code>

 * is thrown.

 *

 * @author Kara Kytle

 * @author Florian Bomers

 * @author Matthias Pfisterer

 */

public class MidiSystem {

    /**

     * Private no-args constructor for ensuring against instantiation.

     */

    private MidiSystem() {

    }

    /**

     * Obtains an array of information objects representing

     * the set of all MIDI devices available on the system.

     * A returned information object can then be used to obtain the

     * corresponding device object, by invoking

     * {@link #getMidiDevice(MidiDevice.Info) getMidiDevice}.

     *

     * @return an array of <code>MidiDevice.Info</code> objects, one

     * for each installed MIDI device.  If no such devices are installed,

     * an array of length 0 is returned.

     */

    public static MidiDevice.Info[] getMidiDeviceInfo() {

        List allInfos = new ArrayList();

        List providers = getMidiDeviceProviders();

        for(int i = 0; i < providers.size(); i++) {

            MidiDeviceProvider provider = (MidiDeviceProvider) providers.get(i);

            MidiDevice.Info[] tmpinfo = provider.getDeviceInfo();

            for (int j = 0; j < tmpinfo.length; j++) {

                allInfos.add( tmpinfo[j] );

            }

        }

        MidiDevice.Info[] infosArray = (MidiDevice.Info[]) allInfos.toArray(new MidiDevice.Info[0]);

        return infosArray;

    }

    /**

     * Obtains the requested MIDI device.

     *

     * @param info a device information object representing the desired device.

     * @return the requested device

     * @throws MidiUnavailableException if the requested device is not available

     * due to resource restrictions

     * @throws IllegalArgumentException if the info object does not represent

     * a MIDI device installed on the system

     * @see #getMidiDeviceInfo

     */

    public static MidiDevice getMidiDevice(MidiDevice.Info info) throws MidiUnavailableException {

        List providers = getMidiDeviceProviders();

        for(int i = 0; i < providers.size(); i++) {

            MidiDeviceProvider provider = (MidiDeviceProvider) providers.get(i);

            if (provider.isDeviceSupported(info)) {

                MidiDevice device = provider.getDevice(info);

                return device;

            }

        }

        throw new IllegalArgumentException("Requested device not installed: " + info);

    }

    /**

     * Obtains a MIDI receiver from an external MIDI port

     * or other default device.

     * The returned receiver always implements

     * the {@code MidiDeviceReceiver} interface.

     *

     * <p>If the system property

     * <code>javax.sound.midi.Receiver</code>

     * is defined or it is defined in the file "sound.properties",

     * it is used to identify the device that provides the default receiver.

     * For details, refer to the {@link MidiSystem class description}.

     *

     * If a suitable MIDI port is not available, the Receiver is

     * retrieved from an installed synthesizer.

     *

     * <p>If this method returns successfully, the {@link

     * javax.sound.midi.MidiDevice MidiDevice} the

     * <code>Receiver</code> belongs to is opened implicitly, if it is

     * not already open. It is possible to close an implicitly opened

     * device by calling {@link javax.sound.midi.Receiver#close close}

     * on the returned <code>Receiver</code>. All open <code>Receiver</code>

     * instances have to be closed in order to release system resources

     * hold by the <code>MidiDevice</code>. For a

     * detailed description of open/close behaviour see the class

     * description of {@link javax.sound.midi.MidiDevice MidiDevice}.

     *

     *

     * @return the default MIDI receiver

     * @throws MidiUnavailableException if the default receiver is not

     *         available due to resource restrictions,

     *         or no device providing receivers is installed in the system

     */

    public static Receiver getReceiver() throws MidiUnavailableException {

        // may throw MidiUnavailableException

        MidiDevice device = getDefaultDeviceWrapper(Receiver.class);

        Receiver receiver;

        if (device instanceof ReferenceCountingDevice) {

            receiver = ((ReferenceCountingDevice) device).getReceiverReferenceCounting();

        } else {

            receiver = device.getReceiver();

        }

        if (!(receiver instanceof MidiDeviceReceiver)) {

            receiver = new MidiDeviceReceiverEnvelope(device, receiver);

        }

        return receiver;

    }

    /**

     * Obtains a MIDI transmitter from an external MIDI port

     * or other default source.

     * The returned transmitter always implements

     * the {@code MidiDeviceTransmitter} interface.

     *

     * <p>If the system property

     * <code>javax.sound.midi.Transmitter</code>

     * is defined or it is defined in the file "sound.properties",

     * it is used to identify the device that provides the default transmitter.

     * For details, refer to the {@link MidiSystem class description}.

     *

     * If this method returns successfully, the {@link

     * javax.sound.midi.MidiDevice MidiDevice} the

     * <code>Transmitter</code> belongs to is opened implicitly, if it

     * is not already open. It is possible to close an implicitly

     * opened device by calling {@link

     * javax.sound.midi.Transmitter#close close} on the returned

     * <code>Transmitter</code>. All open <code>Transmitter</code>

     * instances have to be closed in order to release system resources

     * hold by the <code>MidiDevice</code>. For a detailed description

     * of open/close behaviour see the class description of {@link

     * javax.sound.midi.MidiDevice MidiDevice}.

     *

     * @return the default MIDI transmitter

     * @throws MidiUnavailableException if the default transmitter is not

     *         available due to resource restrictions,

     *         or no device providing transmitters is installed in the system

     */

    public static Transmitter getTransmitter() throws MidiUnavailableException {

        // may throw MidiUnavailableException

        MidiDevice device = getDefaultDeviceWrapper(Transmitter.class);

        Transmitter transmitter;

        if (device instanceof ReferenceCountingDevice) {

            transmitter = ((ReferenceCountingDevice) device).getTransmitterReferenceCounting();

        } else {

            transmitter = device.getTransmitter();

        }

        if (!(transmitter instanceof MidiDeviceTransmitter)) {

            transmitter = new MidiDeviceTransmitterEnvelope(device, transmitter);

        }

        return transmitter;

    }

    /**

     * Obtains the default synthesizer.

     *

     * <p>If the system property

     * <code>javax.sound.midi.Synthesizer</code>

     * is defined or it is defined in the file "sound.properties",

     * it is used to identify the default synthesizer.

     * For details, refer to the {@link MidiSystem class description}.

     *

     * @return the default synthesizer

     * @throws MidiUnavailableException if the synthesizer is not

     *         available due to resource restrictions,

     *         or no synthesizer is installed in the system

     */

    public static Synthesizer getSynthesizer() throws MidiUnavailableException {

        // may throw MidiUnavailableException

        return (Synthesizer) getDefaultDeviceWrapper(Synthesizer.class);

    }

    /**

     * Obtains the default <code>Sequencer</code>, connected to

     * a default device.

     * The returned <code>Sequencer</code> instance is

     * connected to the default <code>Synthesizer</code>,

     * as returned by {@link #getSynthesizer}.

     * If there is no <code>Synthesizer</code>

     * available, or the default <code>Synthesizer</code>

     * cannot be opened, the <code>sequencer</code> is connected

     * to the default <code>Receiver</code>, as returned

     * by {@link #getReceiver}.

     * The connection is made by retrieving a <code>Transmitter</code>

     * instance from the <code>Sequencer</code> and setting its

     * <code>Receiver</code>.

     * Closing and re-opening the sequencer will restore the

     * connection to the default device.

     *

     * <p>This method is equivalent to calling

     * <code>getSequencer(true)</code>.

     *

     * <p>If the system property

     * <code>javax.sound.midi.Sequencer</code>

     * is defined or it is defined in the file "sound.properties",

     * it is used to identify the default sequencer.

     * For details, refer to the {@link MidiSystem class description}.

     *

     * @return the default sequencer, connected to a default Receiver

     * @throws MidiUnavailableException if the sequencer is not

     *         available due to resource restrictions,

     *         or there is no <code>Receiver</code> available by any

     *         installed <code>MidiDevice</code>,

     *         or no sequencer is installed in the system.

     * @see #getSequencer(boolean)

     * @see #getSynthesizer

     * @see #getReceiver

     */

    public static Sequencer getSequencer() throws MidiUnavailableException {

        return getSequencer(true);

    }

    /**

     * Obtains the default <code>Sequencer</code>, optionally

     * connected to a default device.

     *

     * <p>If <code>connected</code> is true, the returned

     * <code>Sequencer</code> instance is

     * connected to the default <code>Synthesizer</code>,

     * as returned by {@link #getSynthesizer}.

     * If there is no <code>Synthesizer</code>

     * available, or the default <code>Synthesizer</code>

     * cannot be opened, the <code>sequencer</code> is connected

     * to the default <code>Receiver</code>, as returned

     * by {@link #getReceiver}.

     * The connection is made by retrieving a <code>Transmitter</code>

     * instance from the <code>Sequencer</code> and setting its

     * <code>Receiver</code>.

     * Closing and re-opening the sequencer will restore the

     * connection to the default device.

     *

     * <p>If <code>connected</code> is false, the returned

     * <code>Sequencer</code> instance is not connected, it

     * has no open <code>Transmitters</code>. In order to

     * play the sequencer on a MIDI device, or a <code>Synthesizer</code>,

     * it is necessary to get a <code>Transmitter</code> and set its

     * <code>Receiver</code>.

     *

     * <p>If the system property

     * <code>javax.sound.midi.Sequencer</code>

     * is defined or it is defined in the file "sound.properties",

     * it is used to identify the default sequencer.

     * For details, refer to the {@link MidiSystem class description}.

     *

     * @return the default sequencer

     * @throws MidiUnavailableException if the sequencer is not

     *         available due to resource restrictions,

     *         or no sequencer is installed in the system,

     *         or if <code>connected</code> is true, and there is

     *         no <code>Receiver</code> available by any installed

     *         <code>MidiDevice</code>

     * @see #getSynthesizer

     * @see #getReceiver

     * @since 1.5

     */

    public static Sequencer getSequencer(boolean connected)

        throws MidiUnavailableException {

        Sequencer seq = (Sequencer) getDefaultDeviceWrapper(Sequencer.class);

        if (connected) {

            // IMPORTANT: this code needs to be synch'ed with

            //            all AutoConnectSequencer instances,

            //            (e.g. RealTimeSequencer) because the

            //            same algorithm for synth retrieval

            //            needs to be used!

            Receiver rec = null;

            MidiUnavailableException mue = null;

            // first try to connect to the default synthesizer

            try {

                Synthesizer synth = getSynthesizer();

                if (synth instanceof ReferenceCountingDevice) {

                    rec = ((ReferenceCountingDevice) synth).getReceiverReferenceCounting();

                } else {

                    synth.open();

                    try {

                        rec = synth.getReceiver();

                    } finally {

                        // make sure that the synth is properly closed

                        if (rec == null) {

                            synth.close();

                        }

                    }

                }

            } catch (MidiUnavailableException e) {

                // something went wrong with synth

                if (e instanceof MidiUnavailableException) {

                    mue = (MidiUnavailableException) e;

                }

            }

            if (rec == null) {

                // then try to connect to the default Receiver

                try {

                    rec = MidiSystem.getReceiver();

                } catch (Exception e) {

                    // something went wrong. Nothing to do then!

                    if (e instanceof MidiUnavailableException) {

                        mue = (MidiUnavailableException) e;

                    }

                }

            }

            if (rec != null) {

                seq.getTransmitter().setReceiver(rec);

                if (seq instanceof AutoConnectSequencer) {

                    ((AutoConnectSequencer) seq).setAutoConnect(rec);

                }

            } else {

                if (mue != null) {

                    throw mue;

                }

                throw new MidiUnavailableException("no receiver available");

            }

        }

        return seq;

    }

    /**

     * Constructs a MIDI sound bank by reading it from the specified stream.

     * The stream must point to

     * a valid MIDI soundbank file.  In general, MIDI soundbank providers 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 source of the sound bank data.

     * @return the sound bank

     * @throws InvalidMidiDataException if the stream does not point to

     * valid MIDI soundbank data recognized by the system

     * @throws IOException if an I/O error occurred when loading the soundbank

     * @see InputStream#markSupported

     * @see InputStream#mark

     */

    public static Soundbank getSoundbank(InputStream stream)

        throws InvalidMidiDataException, IOException {

        SoundbankReader sp = null;

        Soundbank s = null;

        List providers = getSoundbankReaders();

        for(int i = 0; i < providers.size(); i++) {

            sp = (SoundbankReader)providers.get(i);

            s = sp.getSoundbank(stream);

            if( s!= null) {

                return s;

            }

        }

        throw new InvalidMidiDataException("cannot get soundbank from stream");

    }