org.matsim.contrib.zone.ZonalSystems.java Source code

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Here is the source code for org.matsim.contrib.zone.ZonalSystems.java

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/* *********************************************************************** *
 * project: org.matsim.*
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2015 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.contrib.zone;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import org.matsim.api.core.v01.Id;
import org.matsim.contrib.util.distance.DistanceUtils;

import com.google.common.collect.Maps;

public class ZonalSystems {
    public interface ZonalDistanceCalculator {
        double calcDistance(Zone z1, Zone z2);
    }

    public static Map<Id<Zone>, List<Zone>> initZonesByDistance(Map<Id<Zone>, Zone> zones) {
        Map<Id<Zone>, List<Zone>> zonesByDistance = Maps.newHashMapWithExpectedSize(zones.size());
        for (final Zone currentZone : zones.values()) {
            List<Zone> sortedZones = zones.values().stream()//
                    .sorted(Comparator.comparing(z -> DistanceUtils.calculateSquaredDistance(currentZone, z)))//
                    .collect(Collectors.toList());
            zonesByDistance.put(currentZone.getId(), sortedZones);
        }
        return zonesByDistance;
    }
}