RandomPlanSelector.java

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/* *********************************************************************** *
 * project: org.matsim.*
 * RandomPlanSelector.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2007 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.replanning.selectors;

import org.matsim.api.core.v01.population.BasicPlan;
import org.matsim.api.core.v01.population.HasPlansAndId;
import org.matsim.core.gbl.MatsimRandom;


public class RandomPlanSelector<T extends BasicPlan, I> implements PlanSelector<T, I> {

    @Override
    public T selectPlan(final HasPlansAndId<T, I> person) {
        // this used to use person.getRandomPlan(), but I inlined the function here in order to get rid of the function of the data class.
        // kai, nov'13
        if (person.getPlans().size() == 0) {
            return null;
        }
        
        int index = (int)(MatsimRandom.getRandom().nextDouble()*person.getPlans().size());
        // yyyy As far as I can tell, this produces race conditions when running multi-threaded.  I.e. when running the same
        // setup twice, this function may return different results per thread or per person.  kai, jun'14
        
        return person.getPlans().get(index);
    }
}