ArrayBasedDataContainerProvider.java

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/* *********************************************************************** *
 * project: org.matsim.*
 * ArrayBasedDataContainerProvider.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.core.trafficmonitoring;

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 java.util.Map;

class ArrayBasedDataContainerProvider implements DataContainerProvider {

    private final TravelTimeData[] arrayLinkData;
    private final DataContainerProvider delegate;
    
    public ArrayBasedDataContainerProvider(Map<Id<Link>, TravelTimeData> linkData, TravelTimeDataFactory ttDataFactory,
            Network network) {
        this.arrayLinkData = new TravelTimeData[network.getLinks().size()];
        this.delegate = new MapBasedDataContainerProvider(linkData, ttDataFactory);
    }
    
    /*
     * This method is called from the EventHandler part of the TravelTimeCalculator.
     * There, only link ids are available. We cannot optimize this. 
     */
    @Override
    public TravelTimeData getTravelTimeData(final Id<Link> linkId, final boolean createIfMissing) {
        return this.delegate.getTravelTimeData(linkId, createIfMissing);
    }
    
    /*
     * This method is called from the TravelTime part of the TravelTimeCalculator.
     * There, links are available. we can optimize this by using an array instead of a map.
     * 
     *  Probably pre-initialize all DataContainers to avoid the null-check?
     */
    @Override
    public TravelTimeData getTravelTimeData(Link link, boolean createIfMissing) {
        if (link instanceof HasIndex) {
            int index = ((HasIndex) link).getArrayIndex();
            TravelTimeData data = this.arrayLinkData[index];
            if (data == null) {
                data = this.delegate.getTravelTimeData(link, createIfMissing);
                this.arrayLinkData[index] = data;
            }
            return data;
        } else {
            return this.delegate.getTravelTimeData(link, createIfMissing);
        }
    }
    
}