javazoom.jl.player.AudioDeviceFactory Maven / Gradle / Ivy
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/*
* 11/19/04 1.0 moved to LGPL.
* 29/01/00 Initial version. [email protected]
*-----------------------------------------------------------------------
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------
*/
package javazoom.jl.player;
import javazoom.jl.decoder.JavaLayerException;
/**
* An AudioDeviceFactory class is responsible for creating
* a specific AudioDevice implementation. A factory implementation
* can be as simple or complex as desired and may support just one implementation
* or may return several implementations depending upon the execution
* environment.
*
* When implementing a factory that provides an AudioDevice that uses
* class that may not be present, the factory should dynamically link to any
* specific implementation classes required to instantiate or test the audio
* implementation. This is so that the application as a whole
* can run without these classes being present. The audio
* device implementation, however, will usually statically link to the classes
* required. (See the JavaSound deivce and factory for an example
* of this.)
*
* @see FactoryRegistry
*
* @since 0.0.8
* @author Mat McGowan
*/
public abstract class AudioDeviceFactory
{
/**
* Creates a new AudioDevice.
*
* @return a new instance of a specific class of AudioDevice.
* @throws JavaLayerException if an instance of AudioDevice could not
* be created.
*/
public abstract AudioDevice createAudioDevice() throws JavaLayerException;
/**
* Creates an instance of an AudioDevice implementation.
* @param loader The ClassLoader to use to
* load the named class, or null to use the
* system class loader.
* @param name The name of the class to load.
* @return A newly-created instance of the audio device class.
*/
protected AudioDevice instantiate(ClassLoader loader, String name)
throws ClassNotFoundException,
IllegalAccessException,
InstantiationException
{
AudioDevice dev = null;
Class cls = null;
if (loader==null)
{
cls = Class.forName(name);
}
else
{
cls = loader.loadClass(name);
}
Object o = cls.newInstance();
dev = (AudioDevice)o;
return dev;
}
}