MultiClickDetector.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.mpd.internal;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.openhab.core.types.Type;

public class MultiClickDetector<T extends Type> {

    private MultiClickListener<T> listener;
    private long multiClickResolution;

    private Map<T, List<Long>> cache;

    public MultiClickDetector(MultiClickListener<T> listener, long multiClickResolution) {
        this.listener = listener;
        this.multiClickResolution = multiClickResolution;
        cache = new HashMap<T, List<Long>>();
    }

    public void add(T type, long clickTime) {
        if (cache.get(type) == null) {
            cache.put(type, new ArrayList<Long>());
        }

        cache.get(type).add(clickTime);
        detectClicks();
    }

    protected void detectClicks() {
        int clickCount = 0;

        for (T type : cache.keySet()) {

            List<Long> list = cache.get(type);
            if (list != null && !list.isEmpty()) {
                long currentTime = System.currentTimeMillis();
                Iterator<Long> cacheIterator = list.iterator();
                while (cacheIterator.hasNext()) {
                    if (currentTime - cacheIterator.next() <= multiClickResolution) {
                        clickCount++;
                        if (clickCount == 2) {
                            listener.onDoubleClick(type);
                        }
                    } else {
                        cacheIterator.remove();
                    }
                }
            }

            listener.onClick(type);
        }
    }

    public interface MultiClickListener<T extends Type> {

        void onClick(T type);

        void onDoubleClick(T type);

    }

}