midideviceprovider.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

/*
 * @(#)MidiDeviceProvider.java	1.20 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.sound.midi.spi;		  	 

import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiUnavailableException;

/**
 * A <code>MidiDeviceProvider</code> is a factory or provider for a particular 
 * type of MIDI device.
 * This mechanism allows the implementation to determine
 * how resources are managed in the creation and management of
 * a device.
 *
 * @version 1.20 05/11/17
 * @author Kara Kytle
 */
public abstract class MidiDeviceProvider {


    /**
     * Indicates whether the device provider supports the device represented by
     * the specified device info object.
     * @param info an info object that describes the device for which support is queried
     * @return <code>true</code> if the specified device is supported, 
     * otherwise <code>false</code>
     */
    public boolean isDeviceSupported(MidiDevice.Info info) {

	MidiDevice.Info infos[] = getDeviceInfo();

	for(int i=0; i<infos.length; i++) {
	    if( info.equals( infos[i] ) ) {
		return true;
	    }
	}
	return false;
    }


    /**
     * Obtains the set of info objects representing the device
     * or devices provided by this <code>MidiDeviceProvider</code>.
     * @return set of device info objects
     */
    public abstract MidiDevice.Info[] getDeviceInfo();


    /**
     * Obtains an instance of the device represented by the info object.
     * @param info an info object that describes the desired device
     * @return device instance
     * @throws IllegalArgumentException if the info object specified does not
     * match the info object for a device supported by this <code>MidiDeviceProvider</code>.
     */
    public abstract MidiDevice getDevice(MidiDevice.Info info);
}