Ipx800HandlerMulti.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.ipx800.internal.handler;

import java.util.Date;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;

import org.openhab.binding.ipx800.internal.itemslot.Ipx800AstableSwitch;
import org.openhab.binding.ipx800.internal.itemslot.Ipx800Dimmer;
import org.openhab.binding.ipx800.internal.itemslot.Ipx800DoubleClic;
import org.openhab.binding.ipx800.internal.itemslot.Ipx800Item;
import org.openhab.binding.ipx800.internal.itemslot.Ipx800SimpleClic;
import org.openhab.core.library.types.PercentType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This handler can handle simple clic/double clic/dimmer items on the same port
 * 
 * @author Seebag
 * @since 1.8.0
 *
 */
public class Ipx800HandlerMulti implements Ipx800Handler {
    private static final Logger logger = LoggerFactory.getLogger(Ipx800HandlerMulti.class);
    private final static int MAX_DB_CLIC_DURATION = 2000;
    private final static int DIMMER_REPEAT_PERIOD = 500;

    private enum ClicState {
        IDLE,
        FIRST_PRESSED,
        DIMMER,
        WAITING,
        SECOND_PRESSED
    };

    private ClicState clicState = ClicState.IDLE;

    private long lastClicTimestamp = 0;

    private Timer timer;

    private boolean switchStateOf(Class<? extends Ipx800Item> class1, Map<String, Ipx800Item> items) {
        boolean continu = false;
        for (Ipx800Item item : items.values()) {
            if (class1.isInstance(item)) {
                if (item instanceof Ipx800AstableSwitch) {
                    Ipx800AstableSwitch i = (Ipx800AstableSwitch) item;
                    i.switchState(true);
                } else if (item instanceof Ipx800Dimmer) {
                    Ipx800Dimmer i = (Ipx800Dimmer) item;
                    i.increment(true);
                    if (i.getState() != PercentType.HUNDRED) {
                        continu = true;
                    }
                    // FIXME synchronize all dimers ?
                }
            }
        }
        return continu;
    }

    private synchronized void programTimer(TimerTask task, int delay, int period) {
        cancelTimer();
        timer = new Timer();
        if (period == 0) {
            timer.schedule(task, delay);
        } else {
            timer.schedule(task, delay, period);
        }
    }

    private synchronized void cancelTimer() {
        if (timer != null) {
            timer.cancel();
        }
    }

    @Override
    public boolean updateState(final Map<String, Ipx800Item> items, String state) {
        boolean enabled = state.charAt(0) == '1' ? true : false;
        if (enabled) {
            if (clicState == ClicState.IDLE) {
                clicState = ClicState.FIRST_PRESSED;
                programTimer(new TimerTask() {
                    @Override
                    public void run() {
                        try {
                            clicState = ClicState.DIMMER;
                            if (!switchStateOf(Ipx800Dimmer.class, items)) {
                                cancelTimer();
                            }
                        } catch (Exception e) {
                            logger.error("### Exception in timer ", e);
                        }
                    }
                }, MAX_DB_CLIC_DURATION + 100, DIMMER_REPEAT_PERIOD);
            } else if (clicState == ClicState.WAITING) {
                clicState = ClicState.SECOND_PRESSED;
            }
        } else {
            if (clicState == ClicState.FIRST_PRESSED) {
                clicState = ClicState.WAITING;
                lastClicTimestamp = new Date().getTime();
                // See if synchronisation is mandatory
                programTimer(new TimerTask() {
                    @Override
                    public void run() {
                        try {
                            clicState = ClicState.IDLE;
                            switchStateOf(Ipx800SimpleClic.class, items);
                        } catch (Exception e) {
                            logger.error("### Exception in timer ", e);
                        }
                    }
                }, MAX_DB_CLIC_DURATION, 0);
            } else if (clicState == ClicState.SECOND_PRESSED) {
                clicState = ClicState.IDLE;
                if (lastClicTimestamp + MAX_DB_CLIC_DURATION >= new Date().getTime()) {
                    switchStateOf(Ipx800DoubleClic.class, items);
                }
                cancelTimer();
            } else {
                clicState = ClicState.IDLE;
                cancelTimer();
            }
        }
        return false;
    }

}