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114 lines
5.1 KiB
Java
114 lines
5.1 KiB
Java
/*******************************************************************************
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* Copyright (C) 2014 Stefan Schroeder
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3.0 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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package com.graphhopper.jsprit.examples;
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import com.graphhopper.jsprit.analysis.toolbox.Plotter;
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import com.graphhopper.jsprit.analysis.toolbox.Plotter.Label;
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import com.graphhopper.jsprit.core.algorithm.VehicleRoutingAlgorithm;
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import com.graphhopper.jsprit.core.algorithm.VehicleRoutingAlgorithmBuilder;
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import com.graphhopper.jsprit.core.algorithm.state.StateManager;
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import com.graphhopper.jsprit.core.problem.Location;
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import com.graphhopper.jsprit.core.problem.VehicleRoutingProblem;
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import com.graphhopper.jsprit.core.problem.constraint.ConstraintManager;
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import com.graphhopper.jsprit.core.problem.constraint.ServiceDeliveriesFirstConstraint;
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import com.graphhopper.jsprit.core.problem.io.VrpXMLWriter;
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import com.graphhopper.jsprit.core.problem.job.Delivery;
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import com.graphhopper.jsprit.core.problem.job.Pickup;
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import com.graphhopper.jsprit.core.problem.solution.VehicleRoutingProblemSolution;
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import com.graphhopper.jsprit.core.problem.vehicle.VehicleImpl;
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import com.graphhopper.jsprit.core.problem.vehicle.VehicleImpl.Builder;
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import com.graphhopper.jsprit.core.problem.vehicle.VehicleType;
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import com.graphhopper.jsprit.core.problem.vehicle.VehicleTypeImpl;
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import com.graphhopper.jsprit.core.reporting.SolutionPrinter;
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import com.graphhopper.jsprit.core.util.Solutions;
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import com.graphhopper.jsprit.util.Examples;
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import java.util.Collection;
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public class SimpleVRPWithBackhaulsExample {
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public static void main(String[] args) {
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/*
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* some preparation - create output folder
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*/
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Examples.createOutputFolder();
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/*
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* get a vehicle type-builder and build a type with the typeId "vehicleType" and a capacity of 2
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*/
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VehicleTypeImpl.Builder vehicleTypeBuilder = VehicleTypeImpl.Builder.newInstance("vehicleType").addCapacityDimension(0, 2);
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VehicleType vehicleType = vehicleTypeBuilder.build();
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/*
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* get a vehicle-builder and build a vehicle located at (10,10) with type "vehicleType"
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*/
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Builder vehicleBuilder = VehicleImpl.Builder.newInstance("vehicle");
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vehicleBuilder.setStartLocation(Location.newInstance(10, 10));
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vehicleBuilder.setType(vehicleType);
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VehicleImpl vehicle = vehicleBuilder.build();
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/*
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* build pickups and deliveries at the required locations, each with a capacity-demand of 1.
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*/
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Pickup pickup1 = Pickup.Builder.newInstance("1").addSizeDimension(0, 1).setLocation(Location.newInstance(5, 7)).build();
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Delivery delivery1 = Delivery.Builder.newInstance("2").addSizeDimension(0, 1).setLocation(Location.newInstance(5, 13)).build();
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Pickup pickup2 = Pickup.Builder.newInstance("3").addSizeDimension(0, 1).setLocation(Location.newInstance(15, 7)).build();
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Delivery delivery2 = Delivery.Builder.newInstance("4").addSizeDimension(0, 1).setLocation(Location.newInstance(15, 13)).build();
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VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
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vrpBuilder.addVehicle(vehicle);
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vrpBuilder.addJob(pickup1).addJob(pickup2).addJob(delivery1).addJob(delivery2);
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VehicleRoutingProblem problem = vrpBuilder.build();
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VehicleRoutingAlgorithmBuilder vraBuilder = new VehicleRoutingAlgorithmBuilder(problem, "input/algorithmConfig.xml");
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vraBuilder.addCoreConstraints();
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vraBuilder.addDefaultCostCalculators();
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StateManager stateManager = new StateManager(problem);
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ConstraintManager constraintManager = new ConstraintManager(problem, stateManager);
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constraintManager.addConstraint(new ServiceDeliveriesFirstConstraint(), ConstraintManager.Priority.CRITICAL);
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vraBuilder.setStateAndConstraintManager(stateManager, constraintManager);
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VehicleRoutingAlgorithm algorithm = vraBuilder.build();
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/*
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* and search a solution
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*/
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Collection<VehicleRoutingProblemSolution> solutions = algorithm.searchSolutions();
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/*
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* get the best
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*/
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VehicleRoutingProblemSolution bestSolution = Solutions.bestOf(solutions);
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new VrpXMLWriter(problem, solutions).write("output/problem-with-solution.xml");
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SolutionPrinter.print(bestSolution);
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/*
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* plot
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*/
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Plotter plotter = new Plotter(problem, bestSolution);
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plotter.setLabel(Label.SIZE);
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plotter.plot("output/solution.png", "solution");
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}
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}
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