www.pudn.com > d4j.zip > Device.java

// local.dialogic.Device interface 
// $Id: Device.java,v 2.6 2001/07/12 23:49:07 tron Exp tron $ 
/*  
 * Copyright (c) 1999 Carlos G Mendioroz. 
 * 
 *  This file is part of D4J. 
 * 
 *  D4J is free software; you can redistribute it and/or 
 *  modify it under the terms of the GNU Lesser General Public 
 *  License as published by the Free Software Foundation; either 
 *  version 2 of the License, or (at your option) any later version. 
 *   
 *  D4J 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 
 *  Lesser General Public License for more details. 
 *   
 *  You should have received a copy of the GNU Lesser General Public 
 *  License along with this library; if not, write to the 
 *  Free Software Foundation, Inc., 59 Temple Place - Suite 330, 
 *  Boston, MA  02111-1307, USA. 
 * 
 * Report problems and direct all questions to: 
 * 
 *	tron@acm.org 
 */ 
package local.dialogic; 
 
public abstract class Device extends java.lang.Object { 
    // Variables 
    static private java.util.Vector deviceAtDev;   // Class instances 
    protected int device; 
    protected String name; 
    protected Channel channel = null; 
     
    static { 
        deviceAtDev = new java.util.Vector(5,4); 
    } 
     
    public static Device atDev(int dev) { 
        if (dev != 0 && dev < deviceAtDev.size()) 
            return (Device)deviceAtDev.elementAt(dev); 
        else 
            return null; 
    } 
     
    public Device(Channel channel, String name) 
    { 
        this.channel = channel; 
        this.name = name; 
    } 
 
    public void finalize() throws Throwable  
    { 
        close(); 
        super.finalize(); 
    } 
     
    protected void register() 
    { 
        if (device != 0) { 
            if (deviceAtDev.size() <= device) 
                deviceAtDev.setSize(device + 1); 
            deviceAtDev.setElementAt(this, device); 
            if (channel != null) 
                channel.register(this); 
        } 
    } 
     
    public void close()  
    { 
        if (device != 0) 
            deviceAtDev.setElementAt(null, device); 
        if (channel != null) 
            channel.unregister(this); 
    } 
 
    public boolean source(EVT evt)  
    {  
        return evt.dev == device; 
    } 
     
    public abstract int getTs(); 
    public abstract void listen(Device source); 
    public abstract void listen(Channel aChannel, Resource resource); 
 
    public String toString() { 
        return name + "/" + device; 
    } 
}