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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule
engine powered score calculation. This is the drools-planner-examples module which contains examples on how to use
Drools Planner.
/*
* Copyright 2011 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.planner.examples.tsp.persistence;
import java.io.IOException;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import org.drools.planner.core.solution.Solution;
import org.drools.planner.examples.common.persistence.AbstractTxtSolutionImporter;
import org.drools.planner.examples.pas.domain.AdmissionPart;
import org.drools.planner.examples.pas.domain.BedDesignation;
import org.drools.planner.examples.tsp.domain.City;
import org.drools.planner.examples.tsp.domain.CityAssignment;
import org.drools.planner.examples.tsp.domain.TravelingSalesmanTour;
public class TspSolutionImporter extends AbstractTxtSolutionImporter {
private static final String INPUT_FILE_SUFFIX = ".tsp";
public static void main(String[] args) {
new TspSolutionImporter().convertAll();
}
public TspSolutionImporter() {
super(new TspDaoImpl());
}
@Override
protected String getInputFileSuffix() {
return INPUT_FILE_SUFFIX;
}
public TxtInputBuilder createTxtInputBuilder() {
return new TravelingSalesmanTourInputBuilder();
}
public class TravelingSalesmanTourInputBuilder extends TxtInputBuilder {
private TravelingSalesmanTour travelingSalesmanTour;
private int cityListSize;
public Solution readSolution() throws IOException {
travelingSalesmanTour = new TravelingSalesmanTour();
travelingSalesmanTour.setId(0L);
readHeaders();
readCityList();
readConstantLine("EOF");
createCityAssignmentList();
logger.info("TravelingSalesmanTour with {} cities.",
travelingSalesmanTour.getCityList().size());
BigInteger possibleSolutionSize = factorial(travelingSalesmanTour.getCityList().size() - 1);
String flooredPossibleSolutionSize = "10^" + (possibleSolutionSize.toString().length() - 1);
logger.info("TravelingSalesmanTour with flooredPossibleSolutionSize ({}) and possibleSolutionSize({}).",
flooredPossibleSolutionSize, possibleSolutionSize);
return travelingSalesmanTour;
}
private void readHeaders() throws IOException {
travelingSalesmanTour.setName(readStringValue("NAME :"));
readUntilConstantLine("TYPE : TSP");
cityListSize = readIntegerValue("DIMENSION :");
String edgeWeightType = readStringValue("EDGE_WEIGHT_TYPE :");
if (!edgeWeightType.equalsIgnoreCase("EUC_2D")) {
// Only Euclidean distance is implemented in City.getDistance(City)
throw new IllegalArgumentException("The edgeWeightType (" + edgeWeightType + ") is not supported.");
}
}
private void readCityList() throws IOException {
readConstantLine("NODE_COORD_SECTION");
List cityList = new ArrayList(cityListSize);
for (int i = 0; i < cityListSize; i++) {
String line = bufferedReader.readLine();
String[] lineTokens = splitBySpace(line, 3);
City city = new City();
city.setId(Long.parseLong(lineTokens[0]));
city.setLatitude(Double.parseDouble(lineTokens[1]));
city.setLongitude(Double.parseDouble(lineTokens[2]));
cityList.add(city);
}
travelingSalesmanTour.setCityList(cityList);
travelingSalesmanTour.setStartCity(cityList.get(0));
}
private void createCityAssignmentList() {
List cityList = travelingSalesmanTour.getCityList();
List cityAssignmentList = new ArrayList(cityList.size());
long id = 0L;
for (City city : cityList) {
CityAssignment cityAssignment = new CityAssignment();
cityAssignment.setId(id);
id++;
cityAssignment.setCity(city);
// Notice that we leave the PlanningVariable properties on null
cityAssignmentList.add(cityAssignment);
if (city.equals(travelingSalesmanTour.getStartCity())) {
travelingSalesmanTour.setStartCityAssignment(cityAssignment);
}
}
travelingSalesmanTour.setCityAssignmentList(cityAssignmentList);
}
private BigInteger factorial(int base) {
BigInteger value = BigInteger.ONE;
for (int i = 1; i <= base; i++) {
value = value.multiply(BigInteger.valueOf(base));
}
return value;
}
}
}