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//+======================================================================
// $Source$
//
// Project:   Tango
//
// Description:  java source code for the TANGO client/server API.
//
// $Author: pascal_verdier $
//
// Copyright (C) :      2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,
//						European Synchrotron Radiation Facility
//                      BP 220, Grenoble 38043
//                      FRANCE
//
// This file is part of Tango.
//
// Tango 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 3 of the License, or
// (at your option) any later version.
// 
// Tango 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 Tango.  If not, see .
//
// $Revision: 26491 $
//
//-======================================================================


package fr.esrf.TangoApi.events;

import fr.esrf.Tango.DevFailed;
import fr.esrf.TangoApi.DeviceProxy;

import javax.swing.*;
import java.util.ArrayList;
import java.util.EventListener;

/**
 *
 * @author  pascal_verdier
 */
public class TangoPipe extends EventDispatcher implements java.io.Serializable {

	//==============================================================
    /**
	 *	Creates a new instance of TangoPipe
     * @param device_proxy device proxy object.
     * @param attr_name    attribute name.
     * @param filters      filter array
	 */
	//==============================================================
    public TangoPipe(DeviceProxy device_proxy, String attr_name, String[] filters) {
        super(device_proxy);
        this.attr_name = attr_name;
        this.filters = filters;
        event_identifier = -1;
    }
    
	//==============================================================
	//==============================================================
    public void addTangoPipeListener(ITangoPipeListener listener, boolean stateless)
                throws DevFailed
    {
		event_listeners.add(ITangoPipeListener.class, listener);
        event_identifier = subscribe_pipe_event(attr_name, filters, stateless);
    }
    
	//==============================================================
	//==============================================================
    public void removeTangoPipeListener(ITangoPipeListener listener)
                throws DevFailed
    {
        event_listeners.remove(ITangoPipeListener.class,listener);
        if ( event_listeners.size() == 0 )
           unsubscribe_event(event_identifier);

    }
	//==============================================================
	//==============================================================
	public void dispatch_event(final EventData eventData) {
		final TangoPipe tangoPipe = this;
        if (EventUtil.graphicAvailable()) {
                //   Causes doRun.run() to be executed asynchronously
                //      on the AWT event dispatching thread.
            Runnable do_work_later = new Runnable() {
                public void run() {
                    fireTangoPipeEvent(tangoPipe, eventData);
                }
            };
            SwingUtilities.invokeLater(do_work_later);
        }
        else
            fireTangoPipeEvent(tangoPipe, eventData);
    }

	//==============================================================
	//==============================================================
    private void fireTangoPipeEvent(TangoPipe tangoPipe, EventData eventData) {
        TangoPipeEvent tangoPipeEvent = new TangoPipeEvent(tangoPipe, eventData);
        // Notifying those that are interested in this event
        ArrayList listeners = event_listeners.getListeners(ITangoPipeListener.class);
        for (EventListener eventListener : listeners) {
            ((ITangoPipeListener) eventListener).pipe(tangoPipeEvent);
        }
    }
	//==============================================================
	//==============================================================

    String attr_name;
    int event_identifier;
    String[] filters;
}