/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.mahout.ga.watchmaker.travellingsalesman;
import java.util.List;
/**
* Strategy interface for providing distances between cities in the Travelling Salesman problem.
*
* <br>
* The original code is from <b>the Watchmaker project</b> (https://watchmaker.dev.java.net/).
*/
public interface DistanceLookup {
/**
* @return The list of cities that this object knows about.
*/
List<String> getKnownCities();
/**
* Looks-up the distance between two cities.
*
* @param startingCity
* The city to start from.
* @param destinationCity
* The city to end in.
* @return The distance (in kilometres) between the two cities.
*/
int getDistance(String startingCity, String destinationCity);
}