ArrayBasedTravelTimeInfoProvider.java

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/* *********************************************************************** *
 * project: org.matsim.*
 * ArrayBasedTravelTimeInfoProvider.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2013 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */

package org.matsim.withinday.trafficmonitoring;

import java.util.Map;

import org.matsim.api.core.v01.Id;
import org.matsim.api.core.v01.network.Link;
import org.matsim.api.core.v01.network.Network;
import org.matsim.core.router.priorityqueue.HasIndex;
import org.matsim.withinday.trafficmonitoring.WithinDayTravelTime.TravelTimeInfo;

public class ArrayBasedTravelTimeInfoProvider implements TravelTimeInfoProvider {

    private final TravelTimeInfo[] arrayLinkData;
    private final TravelTimeInfoProvider delegate;
    
    public ArrayBasedTravelTimeInfoProvider(Map<Id<Link>, TravelTimeInfo> linkData, Network network) {
        this.delegate = new MapBasedTravelTimeInfoProvider(linkData);
        this.arrayLinkData = new TravelTimeInfo[linkData.size()];
    }
    
    /*
     * This method is called from the EventHandler part of the WithinDayTravelTime.
     * There, only link ids are available. We cannot optimize this. 
     */
    @Override
    public TravelTimeInfo getTravelTimeInfo(final Id<Link> linkId) {
        return this.delegate.getTravelTimeInfo(linkId);
    }
    
    /*
     * This method is called from the TravelTime part of the WithinDayTravelTime.
     * There, link are available. we can optimize this by using an array instead of a map.
     */
    @Override
    public TravelTimeInfo getTravelTimeInfo(Link link) {
        if (link instanceof HasIndex) {
            int index = ((HasIndex) link).getArrayIndex();
            TravelTimeInfo data = this.arrayLinkData[index];
            if (data == null) {
                data = this.delegate.getTravelTimeInfo(link);
                this.arrayLinkData[index] = data;
            }
            return data;
        } else {
            return this.delegate.getTravelTimeInfo(link);
        }
    }
    
}