package bradleyross.music.MidiRouter;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiUnavailableException;
/**
 * Test whether MidiDevice.Info.getMidiDevice always gives the
 * same object.
 * 
 * <p>Three MidiDevice objects are created from the same
 *    MidiDevice.Info object.  The same object should be returned
 *    in each case.  This is not true for the synthesizer and
 *    sequencer.</p>
 * <p>A MidiDevice.Info object was created from each of the MidiDevice
 *    objects.  The hash code should be the same for each of the three
 *    cases.  This appears to be the case.</p>
 * <p>Question: If two identical MIDI keyboards are attached at the same time,
 *    will they have different hash codes?</p> 
 * @author Bradley Ross
 *
 */
public class RelationshipTest implements Runnable {
        /**
         * Carries out test for a single MidiDevice.Info object.
         * @param item object to be tested
         * @throws MidiUnavailableException
         */
        protected void single(MidiDevice.Info item) throws MidiUnavailableException {
                System.out.println("Name: " + item.getName());
                System.out.println("Vendor: " + item.getVendor());
                System.out.println("Version: " + item.getVersion());
                System.out.println("Description: " + item.getDescription());
                System.out.println("Hash: " + Integer.toString(item.hashCode()));
                MidiDevice device1 = MidiSystem.getMidiDevice(item);
                MidiDevice device2 = MidiSystem.getMidiDevice(item);
                MidiDevice device3 = MidiSystem.getMidiDevice(item);
                if (device1 == device2) {
                        System.out.println("object 1 equals object 2");
                } else {
                        System.out.println("object 1 not equals object 2 - this appears to be bug");
                }
                if (device2 == device3) {
                        System.out.println("object 2 equals object 3");
                } else {
                        System.out.println("object 2 not equals object 3 - this appears to be bug");
                }
                if (device1 == device3) {
                        System.out.println("object 1 equals object 3");
                } else {
                        System.out.println("object 1 not equals object 3 - this appears to be bug");
                }
                System.out.println("Hash from object 1: " + 
                                Integer.toString(device1.getDeviceInfo().hashCode()));
                System.out.println("Hash from object 2: " + 
                                Integer.toString(device2.getDeviceInfo().hashCode()));                          
                System.out.println("Hash from object 3: " + 
                                Integer.toString(device3.getDeviceInfo().hashCode()));
        }
        public void run() {
                try {
                        int counter = 0;
                        MidiDevice.Info[] infoList = MidiSystem.getMidiDeviceInfo();
                        for (MidiDevice.Info item : infoList) {
                                System.out.println("*****  *****  *****");
                                System.out.println("Device " + Integer.toString(counter));
                                single(item);
                                counter++;
                        }
                        System.out.println("*****  *****  *****");
                        MidiDevice.Info synthesizer = MidiSystem.getSynthesizer().getDeviceInfo();
                        System.out.println("Synthesizer");
                        single(synthesizer);
                        System.out.println("*****  *****  *****");
                        MidiDevice.Info sequencer = MidiSystem.getSequencer().getDeviceInfo();
                        System.out.println("Sequencer");
                        single(sequencer);                      
                } catch (MidiUnavailableException ex) {
                        ex.printStackTrace();
                }
        }
        /**
         * Test driver.
         * 
         * @param args not used
         */
        public static void main(String[] args) {
                RelationshipTest instance = new RelationshipTest();
                System.out.println("Java version is " + System.clearProperty("java.version"));
                System.out.println("*****  *****  *****  *****");
                System.out.println("First run");
                instance.run(); 
                for (int i = 0;  i < 2; i++) {
                        System.out.println("*****  *****  *****  *****  *****  *****  *****");
                }
                System.out.println("Second run");
                instance.run();
        }
}