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Example implementation of A* (#8159)

This commit is contained in:
Graham Cox 2019-11-11 21:06:37 +00:00 committed by Grzegorz Piwowarek
parent f9124d3256
commit 3b38c00200
8 changed files with 877 additions and 0 deletions
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30
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/Graph.java Normal file
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package com.baeldung.algorithms.astar;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
public class Graph<T extends GraphNode> {
private final Set<T> nodes;
private final Map<String, Set<String>> connections;
public Graph(Set<T> nodes, Map<String, Set<String>> connections) {
this.nodes = nodes;
this.connections = connections;
}
public T getNode(String id) {
return nodes.stream()
.filter(node -> node.getId().equals(id))
.findFirst()
.orElseThrow(() -> new IllegalArgumentException("No node found with ID"));
}
public Set<T> getConnections(T node) {
return connections.get(node.getId()).stream()
.map(this::getNode)
.collect(Collectors.toSet());
}
}

5
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/GraphNode.java Normal file
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package com.baeldung.algorithms.astar;
public interface GraphNode {
String getId();
}

66
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/RouteFinder.java Normal file
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package com.baeldung.algorithms.astar;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.stream.Collectors;
public class RouteFinder<T extends GraphNode> {
private final Graph<T> graph;
private final Scorer<T> nextNodeScorer;
private final Scorer<T> targetScorer;
public RouteFinder(Graph<T> graph, Scorer<T> nextNodeScorer, Scorer<T> targetScorer) {
this.graph = graph;
this.nextNodeScorer = nextNodeScorer;
this.targetScorer = targetScorer;
}
public List<T> findRoute(T from, T to) {
Map<T, RouteNode<T>> allNodes = new HashMap<>();
Queue<RouteNode> openSet = new PriorityQueue<>();
RouteNode<T> start = new RouteNode<>(from, null, 0d, targetScorer.computeCost(from, to));
allNodes.put(from, start);
openSet.add(start);
while (!openSet.isEmpty()) {
System.out.println("Open Set contains: " + openSet.stream().map(RouteNode::getCurrent).collect(Collectors.toSet()));
RouteNode<T> next = openSet.poll();
System.out.println("Looking at node: " + next);
if (next.getCurrent().equals(to)) {
System.out.println("Found our destination!");
List<T> route = new ArrayList<>();
RouteNode<T> current = next;
do {
route.add(0, current.getCurrent());
current = allNodes.get(current.getPrevious());
} while (current != null);
System.out.println("Route: " + route);
return route;
}
graph.getConnections(next.getCurrent()).forEach(connection -> {
double newScore = next.getRouteScore() + nextNodeScorer.computeCost(next.getCurrent(), connection);
RouteNode<T> nextNode = allNodes.getOrDefault(connection, new RouteNode<>(connection));
allNodes.put(connection, nextNode);
if (nextNode.getRouteScore() > newScore) {
nextNode.setPrevious(next.getCurrent());
nextNode.setRouteScore(newScore);
nextNode.setEstimatedScore(newScore + targetScorer.computeCost(connection, to));
openSet.add(nextNode);
System.out.println("Found a better route to node: " + nextNode);
}
});
}
throw new IllegalStateException("No route found");
}
}

67
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/RouteNode.java Normal file
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package com.baeldung.algorithms.astar;
import java.util.StringJoiner;
class RouteNode<T extends GraphNode> implements Comparable<RouteNode> {
private final T current;
private T previous;
private double routeScore;
private double estimatedScore;
RouteNode(T current) {
this(current, null, Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY);
}
RouteNode(T current, T previous, double routeScore, double estimatedScore) {
this.current = current;
this.previous = previous;
this.routeScore = routeScore;
this.estimatedScore = estimatedScore;
}
T getCurrent() {
return current;
}
T getPrevious() {
return previous;
}
double getRouteScore() {
return routeScore;
}
double getEstimatedScore() {
return estimatedScore;
}
void setPrevious(T previous) {
this.previous = previous;
}
void setRouteScore(double routeScore) {
this.routeScore = routeScore;
}
void setEstimatedScore(double estimatedScore) {
this.estimatedScore = estimatedScore;
}
@Override
public int compareTo(RouteNode other) {
if (this.estimatedScore > other.estimatedScore) {
return 1;
} else if (this.estimatedScore < other.estimatedScore) {
return -1;
} else {
return 0;
}
}
@Override
public String toString() {
return new StringJoiner(", ", RouteNode.class.getSimpleName() + "[", "]").add("current=" + current)
.add("previous=" + previous).add("routeScore=" + routeScore).add("estimatedScore=" + estimatedScore)
.toString();
}
}

5
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/Scorer.java Normal file
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package com.baeldung.algorithms.astar;
public interface Scorer<T extends GraphNode> {
double computeCost(T from, T to);
}

19
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/underground/HaversineScorer.java Normal file
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package com.baeldung.algorithms.astar.underground;
import com.baeldung.algorithms.astar.Scorer;
public class HaversineScorer implements Scorer<Station> {
@Override
public double computeCost(Station from, Station to) {
double R = 6372.8; // In kilometers
double dLat = Math.toRadians(to.getLatitude() - from.getLatitude());
double dLon = Math.toRadians(to.getLongitude() - from.getLongitude());
double lat1 = Math.toRadians(from.getLatitude());
double lat2 = Math.toRadians(to.getLatitude());
double a = Math.pow(Math.sin(dLat / 2),2) + Math.pow(Math.sin(dLon / 2),2) * Math.cos(lat1) * Math.cos(lat2);
double c = 2 * Math.asin(Math.sqrt(a));
return R * c;
}
}

643
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/underground/RouteFinderIntegrationTest.java Normal file
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package com.baeldung.algorithms.astar.underground;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import com.baeldung.algorithms.astar.Graph;
import com.baeldung.algorithms.astar.RouteFinder;
import org.junit.Before;
import org.junit.Test;
public class RouteFinderIntegrationTest {
private Graph<Station> underground;
private RouteFinder<Station> routeFinder;
@Before
public void setUp() throws Exception {
Set<Station> stations = new HashSet<>();
Map<String, Set<String>> connections = new HashMap<>();
stations.add(new Station("1", "Acton Town", 51.5028, -0.2801));
stations.add(new Station("2", "Aldgate", 51.5143, -0.0755));
stations.add(new Station("3", "Aldgate East", 51.5154, -0.0726));
stations.add(new Station("4", "All Saints", 51.5107, -0.013));
stations.add(new Station("5", "Alperton", 51.5407, -0.2997));
stations.add(new Station("6", "Amersham", 51.6736, -0.607));
stations.add(new Station("7", "Angel", 51.5322, -0.1058));
stations.add(new Station("8", "Archway", 51.5653, -0.1353));
stations.add(new Station("9", "Arnos Grove", 51.6164, -0.1331));
stations.add(new Station("10", "Arsenal", 51.5586, -0.1059));
stations.add(new Station("11", "Baker Street", 51.5226, -0.1571));
stations.add(new Station("12", "Balham", 51.4431, -0.1525));
stations.add(new Station("13", "Bank", 51.5133, -0.0886));
stations.add(new Station("14", "Barbican", 51.5204, -0.0979));
stations.add(new Station("15", "Barking", 51.5396, 0.081));
stations.add(new Station("16", "Barkingside", 51.5856, 0.0887));
stations.add(new Station("17", "Barons Court", 51.4905, -0.2139));
stations.add(new Station("18", "Bayswater", 51.5121, -0.1879));
stations.add(new Station("19", "Beckton", 51.5148, 0.0613));
stations.add(new Station("20", "Beckton Park", 51.5087, 0.055));
stations.add(new Station("21", "Becontree", 51.5403, 0.127));
stations.add(new Station("22", "Belsize Park", 51.5504, -0.1642));
stations.add(new Station("23", "Bermondsey", 51.4979, -0.0637));
stations.add(new Station("24", "Bethnal Green", 51.527, -0.0549));
stations.add(new Station("25", "Blackfriars", 51.512, -0.1031));
stations.add(new Station("26", "Blackhorse Road", 51.5867, -0.0417));
stations.add(new Station("27", "Blackwall", 51.5079, -0.0066));
stations.add(new Station("28", "Bond Street", 51.5142, -0.1494));
stations.add(new Station("29", "Borough", 51.5011, -0.0943));
stations.add(new Station("30", "Boston Manor", 51.4956, -0.325));
stations.add(new Station("31", "Bounds Green", 51.6071, -0.1243));
stations.add(new Station("32", "Bow Church", 51.5273, -0.0208));
stations.add(new Station("33", "Bow Road", 51.5269, -0.0247));
stations.add(new Station("34", "Brent Cross", 51.5766, -0.2136));
stations.add(new Station("35", "Brixton", 51.4627, -0.1145));
stations.add(new Station("36", "Bromley-By-Bow", 51.5248, -0.0119));
stations.add(new Station("37", "Buckhurst Hill", 51.6266, 0.0471));
stations.add(new Station("38", "Burnt Oak", 51.6028, -0.2641));
stations.add(new Station("39", "Caledonian Road", 51.5481, -0.1188));
stations.add(new Station("40", "Camden Town", 51.5392, -0.1426));
stations.add(new Station("41", "Canada Water", 51.4982, -0.0502));
stations.add(new Station("42", "Canary Wharf", 51.5051, -0.0209));
stations.add(new Station("43", "Canning Town", 51.5147, 0.0082));
stations.add(new Station("44", "Cannon Street", 51.5113, -0.0904));
stations.add(new Station("45", "Canons Park", 51.6078, -0.2947));
stations.add(new Station("46", "Chalfont & Latimer", 51.6679, -0.561));
stations.add(new Station("47", "Chalk Farm", 51.5441, -0.1538));
stations.add(new Station("48", "Chancery Lane", 51.5185, -0.1111));
stations.add(new Station("49", "Charing Cross", 51.508, -0.1247));
stations.add(new Station("50", "Chesham", 51.7052, -0.611));
stations.add(new Station("51", "Chigwell", 51.6177, 0.0755));
stations.add(new Station("52", "Chiswick Park", 51.4946, -0.2678));
stations.add(new Station("53", "Chorleywood", 51.6543, -0.5183));
stations.add(new Station("54", "Clapham Common", 51.4618, -0.1384));
stations.add(new Station("55", "Clapham North", 51.4649, -0.1299));
stations.add(new Station("56", "Clapham South", 51.4527, -0.148));
stations.add(new Station("57", "Cockfosters", 51.6517, -0.1496));
stations.add(new Station("58", "Colindale", 51.5955, -0.2502));
stations.add(new Station("59", "Colliers Wood", 51.418, -0.1778));
stations.add(new Station("60", "Covent Garden", 51.5129, -0.1243));
stations.add(new Station("61", "Crossharbour & London Arena", 51.4957, -0.0144));
stations.add(new Station("62", "Croxley", 51.647, -0.4412));
stations.add(new Station("63", "Custom House", 51.5095, 0.0276));
stations.add(new Station("64", "Cutty Sark", 51.4827, -0.0096));
stations.add(new Station("65", "Cyprus", 51.5085, 0.064));
stations.add(new Station("66", "Dagenham East", 51.5443, 0.1655));
stations.add(new Station("67", "Dagenham Heathway", 51.5417, 0.1469));
stations.add(new Station("68", "Debden", 51.6455, 0.0838));
stations.add(new Station("69", "Deptford Bridge", 51.474, -0.0216));
stations.add(new Station("70", "Devons Road", 51.5223, -0.0173));
stations.add(new Station("71", "Dollis Hill", 51.552, -0.2387));
stations.add(new Station("72", "Ealing Broadway", 51.5152, -0.3017));
stations.add(new Station("73", "Ealing Common", 51.5101, -0.2882));
stations.add(new Station("74", "Earl's Court", 51.492, -0.1973));
stations.add(new Station("75", "Eastcote", 51.5765, -0.397));
stations.add(new Station("76", "East Acton", 51.5168, -0.2474));
stations.add(new Station("77", "East Finchley", 51.5874, -0.165));
stations.add(new Station("78", "East Ham", 51.5394, 0.0518));
stations.add(new Station("79", "East India", 51.5093, -0.0021));
stations.add(new Station("80", "East Putney", 51.4586, -0.2112));
stations.add(new Station("81", "Edgware", 51.6137, -0.275));
stations.add(new Station("82", "Edgware Road (B)", 51.5199, -0.1679));
stations.add(new Station("83", "Edgware Road (C)", 51.5203, -0.17));
stations.add(new Station("84", "Elephant & Castle", 51.4943, -0.1001));
stations.add(new Station("85", "Elm Park", 51.5496, 0.1977));
stations.add(new Station("86", "Elverson Road", 51.4693, -0.0174));
stations.add(new Station("87", "Embankment", 51.5074, -0.1223));
stations.add(new Station("88", "Epping", 51.6937, 0.1139));
stations.add(new Station("89", "Euston", 51.5282, -0.1337));
stations.add(new Station("90", "Euston Square", 51.526, -0.1359));
stations.add(new Station("91", "Fairlop", 51.596, 0.0912));
stations.add(new Station("92", "Farringdon", 51.5203, -0.1053));
stations.add(new Station("93", "Finchley Central", 51.6012, -0.1932));
stations.add(new Station("94", "Finchley Road", 51.5472, -0.1803));
stations.add(new Station("95", "Finsbury Park", 51.5642, -0.1065));
stations.add(new Station("96", "Fulham Broadway", 51.4804, -0.195));
stations.add(new Station("97", "Gallions Reach", 51.5096, 0.0716));
stations.add(new Station("98", "Gants Hill", 51.5765, 0.0663));
stations.add(new Station("99", "Gloucester Road", 51.4945, -0.1829));
stations.add(new Station("100", "Golders Green", 51.5724, -0.1941));
stations.add(new Station("101", "Goldhawk Road", 51.5018, -0.2267));
stations.add(new Station("102", "Goodge Street", 51.5205, -0.1347));
stations.add(new Station("103", "Grange Hill", 51.6132, 0.0923));
stations.add(new Station("104", "Great Portland Street", 51.5238, -0.1439));
stations.add(new Station("105", "Greenford", 51.5423, -0.3456));
stations.add(new Station("106", "Greenwich", 51.4781, -0.0149));
stations.add(new Station("107", "Green Park", 51.5067, -0.1428));
stations.add(new Station("108", "Gunnersbury", 51.4915, -0.2754));
stations.add(new Station("109", "Hainault", 51.603, 0.0933));
stations.add(new Station("110", "Hammersmith", 51.4936, -0.2251));
stations.add(new Station("111", "Hampstead", 51.5568, -0.178));
stations.add(new Station("112", "Hanger Lane", 51.5302, -0.2933));
stations.add(new Station("113", "Harlesden", 51.5362, -0.2575));
stations.add(new Station("114", "Harrow & Wealdston", 51.5925, -0.3351));
stations.add(new Station("115", "Harrow-on-the-Hill", 51.5793, -0.3366));
stations.add(new Station("116", "Hatton Cross", 51.4669, -0.4227));
stations.add(new Station("117", "Heathrow Terminals 1, 2 & 3", 51.4713, -0.4524));
stations.add(new Station("118", "Heathrow Terminal 4", 51.4598, -0.4476));
stations.add(new Station("119", "Hendon Central", 51.5829, -0.2259));
stations.add(new Station("120", "Heron Quays", 51.5033, -0.0215));
stations.add(new Station("121", "High Barnet", 51.6503, -0.1943));
stations.add(new Station("122", "High Street Kensington", 51.5009, -0.1925));
stations.add(new Station("123", "Highbury & Islington", 51.546, -0.104));
stations.add(new Station("124", "Highgate", 51.5777, -0.1458));
stations.add(new Station("125", "Hillingdon", 51.5538, -0.4499));
stations.add(new Station("126", "Holborn", 51.5174, -0.12));
stations.add(new Station("127", "Holland Park", 51.5075, -0.206));
stations.add(new Station("128", "Holloway Road", 51.5526, -0.1132));
stations.add(new Station("129", "Hornchurch", 51.5539, 0.2184));
stations.add(new Station("130", "Hounslow Central", 51.4713, -0.3665));
stations.add(new Station("131", "Hounslow East", 51.4733, -0.3564));
stations.add(new Station("132", "Hounslow West", 51.4734, -0.3855));
stations.add(new Station("133", "Hyde Park Corner", 51.5027, -0.1527));
stations.add(new Station("134", "Ickenham", 51.5619, -0.4421));
stations.add(new Station("135", "Island Gardens", 51.4871, -0.0101));
stations.add(new Station("136", "Kennington", 51.4884, -0.1053));
stations.add(new Station("137", "Kensal Green", 51.5304, -0.225));
stations.add(new Station("138", "Kensington (Olympia)", 51.4983, -0.2106));
stations.add(new Station("139", "Kentish Town", 51.5507, -0.1402));
stations.add(new Station("140", "Kenton", 51.5816, -0.3162));
stations.add(new Station("141", "Kew Gardens", 51.477, -0.285));
stations.add(new Station("142", "Kilburn", 51.5471, -0.2047));
stations.add(new Station("143", "Kilburn Park", 51.5351, -0.1939));
stations.add(new Station("144", "Kingsbury", 51.5846, -0.2786));
stations.add(new Station("145", "King's Cross St. Pancras", 51.5308, -0.1238));
stations.add(new Station("146", "Knightsbridge", 51.5015, -0.1607));
stations.add(new Station("147", "Ladbroke Grove", 51.5172, -0.2107));
stations.add(new Station("148", "Lambeth North", 51.4991, -0.1115));
stations.add(new Station("149", "Lancaster Gate", 51.5119, -0.1756));
stations.add(new Station("150", "Latimer Road", 51.5139, -0.2172));
stations.add(new Station("151", "Leicester Square", 51.5113, -0.1281));
stations.add(new Station("152", "Lewisham", 51.4657, -0.0142));
stations.add(new Station("153", "Leyton", 51.5566, -0.0053));
stations.add(new Station("154", "Leytonstone", 51.5683, 0.0083));
stations.add(new Station("155", "Limehouse", 51.5123, -0.0396));
stations.add(new Station("156", "Liverpool Street", 51.5178, -0.0823));
stations.add(new Station("157", "London Bridge", 51.5052, -0.0864));
stations.add(new Station("158", "Loughton", 51.6412, 0.0558));
stations.add(new Station("159", "Maida Vale", 51.53, -0.1854));
stations.add(new Station("160", "Manor House", 51.5712, -0.0958));
stations.add(new Station("161", "Mansion House", 51.5122, -0.094));
stations.add(new Station("162", "Marble Arch", 51.5136, -0.1586));
stations.add(new Station("163", "Marylebone", 51.5225, -0.1631));
stations.add(new Station("164", "Mile End", 51.5249, -0.0332));
stations.add(new Station("165", "Mill Hill East", 51.6082, -0.2103));
stations.add(new Station("166", "Monument", 51.5108, -0.0863));
stations.add(new Station("167", "Moorgate", 51.5186, -0.0886));
stations.add(new Station("168", "Moor Park", 51.6294, -0.432));
stations.add(new Station("169", "Morden", 51.4022, -0.1948));
stations.add(new Station("170", "Mornington Crescent", 51.5342, -0.1387));
stations.add(new Station("171", "Mudchute", 51.4902, -0.0145));
stations.add(new Station("172", "Neasden", 51.5542, -0.2503));
stations.add(new Station("173", "Newbury Park", 51.5756, 0.0899));
stations.add(new Station("174", "New Cross", 51.4767, -0.0327));
stations.add(new Station("175", "New Cross Gate", 51.4757, -0.0402));
stations.add(new Station("176", "Northfields", 51.4995, -0.3142));
stations.add(new Station("177", "Northolt", 51.5483, -0.3687));
stations.add(new Station("178", "Northwick Park", 51.5784, -0.3184));
stations.add(new Station("179", "Northwood", 51.6111, -0.424));
stations.add(new Station("180", "Northwood Hills", 51.6004, -0.4092));
stations.add(new Station("181", "North Acton", 51.5237, -0.2597));
stations.add(new Station("182", "North Ealing", 51.5175, -0.2887));
stations.add(new Station("183", "North Greenwich", 51.5005, 0.0039));
stations.add(new Station("184", "North Harrow", 51.5846, -0.3626));
stations.add(new Station("185", "North Wembley", 51.5621, -0.3034));
stations.add(new Station("186", "Notting Hill Gate", 51.5094, -0.1967));
stations.add(new Station("187", "Oakwood", 51.6476, -0.1318));
stations.add(new Station("188", "Old Street", 51.5263, -0.0873));
stations.add(new Station("189", "Osterley", 51.4813, -0.3522));
stations.add(new Station("190", "Oval", 51.4819, -0.113));
stations.add(new Station("191", "Oxford Circus", 51.515, -0.1415));
stations.add(new Station("192", "Paddington", 51.5154, -0.1755));
stations.add(new Station("193", "Park Royal", 51.527, -0.2841));
stations.add(new Station("194", "Parsons Green", 51.4753, -0.2011));
stations.add(new Station("195", "Perivale", 51.5366, -0.3232));
stations.add(new Station("196", "Picadilly Circus", 51.5098, -0.1342));
stations.add(new Station("197", "Pimlico", 51.4893, -0.1334));
stations.add(new Station("198", "Pinner", 51.5926, -0.3805));
stations.add(new Station("199", "Plaistow", 51.5313, 0.0172));
stations.add(new Station("200", "Poplar", 51.5077, -0.0173));
stations.add(new Station("201", "Preston Road", 51.572, -0.2954));
stations.add(new Station("202", "Prince Regent", 51.5093, 0.0336));
stations.add(new Station("203", "Pudding Mill Lane", 51.5343, -0.0139));
stations.add(new Station("204", "Putney Bridge", 51.4682, -0.2089));
stations.add(new Station("205", "Queen's Park", 51.5341, -0.2047));
stations.add(new Station("206", "Queensbury", 51.5942, -0.2861));
stations.add(new Station("207", "Queensway", 51.5107, -0.1877));
stations.add(new Station("208", "Ravenscourt Park", 51.4942, -0.2359));
stations.add(new Station("209", "Rayners Lane", 51.5753, -0.3714));
stations.add(new Station("210", "Redbridge", 51.5763, 0.0454));
stations.add(new Station("211", "Regent's Park", 51.5234, -0.1466));
stations.add(new Station("212", "Richmond", 51.4633, -0.3013));
stations.add(new Station("213", "Rickmansworth", 51.6404, -0.4733));
stations.add(new Station("214", "Roding Valley", 51.6171, 0.0439));
stations.add(new Station("215", "Rotherhithe", 51.501, -0.0525));
stations.add(new Station("216", "Royal Albert", 51.5084, 0.0465));
stations.add(new Station("217", "Royal Oak", 51.519, -0.188));
stations.add(new Station("218", "Royal Victoria", 51.5091, 0.0181));
stations.add(new Station("219", "Ruislip", 51.5715, -0.4213));
stations.add(new Station("220", "Ruislip Gardens", 51.5606, -0.4103));
stations.add(new Station("221", "Ruislip Manor", 51.5732, -0.4125));
stations.add(new Station("222", "Russell Square", 51.523, -0.1244));
stations.add(new Station("223", "Seven Sisters", 51.5822, -0.0749));
stations.add(new Station("224", "Shadwell", 51.5117, -0.056));
stations.add(new Station("225", "Shepherd's Bush (C)", 51.5046, -0.2187));
stations.add(new Station("226", "Shepherd's Bush (H)", 51.5058, -0.2265));
stations.add(new Station("227", "Shoreditch", 51.5227, -0.0708));
stations.add(new Station("228", "Sloane Square", 51.4924, -0.1565));
stations.add(new Station("229", "Snaresbrook", 51.5808, 0.0216));
stations.add(new Station("230", "Southfields", 51.4454, -0.2066));
stations.add(new Station("231", "Southgate", 51.6322, -0.128));
stations.add(new Station("232", "Southwark", 51.501, -0.1052));
stations.add(new Station("233", "South Ealing", 51.5011, -0.3072));
stations.add(new Station("234", "South Harrow", 51.5646, -0.3521));
stations.add(new Station("235", "South Kensington", 51.4941, -0.1738));
stations.add(new Station("236", "South Kenton", 51.5701, -0.3081));
stations.add(new Station("237", "South Quay", 51.5007, -0.0191));
stations.add(new Station("238", "South Ruislip", 51.5569, -0.3988));
stations.add(new Station("239", "South Wimbledon", 51.4154, -0.1919));
stations.add(new Station("240", "South Woodford", 51.5917, 0.0275));
stations.add(new Station("241", "Stamford Brook", 51.495, -0.2459));
stations.add(new Station("242", "Stanmore", 51.6194, -0.3028));
stations.add(new Station("243", "Stepney Green", 51.5221, -0.047));
stations.add(new Station("244", "Stockwell", 51.4723, -0.123));
stations.add(new Station("245", "Stonebridge Park", 51.5439, -0.2759));
stations.add(new Station("246", "Stratford", 51.5416, -0.0042));
stations.add(new Station("247", "St. James's Park", 51.4994, -0.1335));
stations.add(new Station("248", "St. John's Wood", 51.5347, -0.174));
stations.add(new Station("249", "St. Paul's", 51.5146, -0.0973));
stations.add(new Station("250", "Sudbury Hill", 51.5569, -0.3366));
stations.add(new Station("251", "Sudbury Town", 51.5507, -0.3156));
stations.add(new Station("252", "Surrey Quays", 51.4933, -0.0478));
stations.add(new Station("253", "Swiss Cottage", 51.5432, -0.1738));
stations.add(new Station("254", "Temple", 51.5111, -0.1141));
stations.add(new Station("255", "Theydon Bois", 51.6717, 0.1033));
stations.add(new Station("256", "Tooting Bec", 51.4361, -0.1598));
stations.add(new Station("257", "Tooting Broadway", 51.4275, -0.168));
stations.add(new Station("258", "Tottenham Court Road", 51.5165, -0.131));
stations.add(new Station("259", "Tottenham Hale", 51.5882, -0.0594));
stations.add(new Station("260", "Totteridge & Whetstone", 51.6302, -0.1791));
stations.add(new Station("261", "Tower Gateway", 51.5106, -0.0743));
stations.add(new Station("262", "Tower Hill", 51.5098, -0.0766));
stations.add(new Station("263", "Tufnell Park", 51.5567, -0.1374));
stations.add(new Station("264", "Turnham Green", 51.4951, -0.2547));
stations.add(new Station("265", "Turnpike Lane", 51.5904, -0.1028));
stations.add(new Station("266", "Upminster", 51.559, 0.251));
stations.add(new Station("267", "Upminster Bridge", 51.5582, 0.2343));
stations.add(new Station("268", "Upney", 51.5385, 0.1014));
stations.add(new Station("269", "Upton Park", 51.5352, 0.0343));
stations.add(new Station("270", "Uxbridge", 51.5463, -0.4786));
stations.add(new Station("271", "Vauxhall", 51.4861, -0.1253));
stations.add(new Station("272", "Victoria", 51.4965, -0.1447));
stations.add(new Station("273", "Walthamstow Central", 51.583, -0.0195));
stations.add(new Station("274", "Wanstead", 51.5775, 0.0288));
stations.add(new Station("275", "Wapping", 51.5043, -0.0558));
stations.add(new Station("276", "Warren Street", 51.5247, -0.1384));
stations.add(new Station("277", "Warwick Avenue", 51.5235, -0.1835));
stations.add(new Station("278", "Waterloo", 51.5036, -0.1143));
stations.add(new Station("279", "Watford", 51.6573, -0.4177));
stations.add(new Station("280", "Wembley Central", 51.5519, -0.2963));
stations.add(new Station("281", "Wembley Park", 51.5635, -0.2795));
stations.add(new Station("282", "Westbourne Park", 51.521, -0.2011));
stations.add(new Station("283", "Westferry", 51.5097, -0.0265));
stations.add(new Station("284", "Westminster", 51.501, -0.1254));
stations.add(new Station("285", "West Acton", 51.518, -0.2809));
stations.add(new Station("286", "West Brompton", 51.4872, -0.1953));
stations.add(new Station("287", "West Finchley", 51.6095, -0.1883));
stations.add(new Station("288", "West Ham", 51.5287, 0.0056));
stations.add(new Station("289", "West Hampstead", 51.5469, -0.1906));
stations.add(new Station("290", "West Harrow", 51.5795, -0.3533));
stations.add(new Station("291", "West India Quay", 51.507, -0.0203));
stations.add(new Station("292", "West Kensington", 51.4907, -0.2065));
stations.add(new Station("293", "West Ruislip", 51.5696, -0.4376));
stations.add(new Station("294", "Whitechapel", 51.5194, -0.0612));
stations.add(new Station("295", "White City", 51.512, -0.2239));
stations.add(new Station("296", "Willesden Green", 51.5492, -0.2215));
stations.add(new Station("297", "Willesden Junction", 51.5326, -0.2478));
stations.add(new Station("298", "Wimbledon", 51.4214, -0.2064));
stations.add(new Station("299", "Wimbledon Park", 51.4343, -0.1992));
stations.add(new Station("300", "Woodford", 51.607, 0.0341));
stations.add(new Station("301", "Woodside Park", 51.6179, -0.1856));
stations.add(new Station("302", "Wood Green", 51.5975, -0.1097));
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connections.put("93", Stream.of("77","165","287").collect(Collectors.toSet()));
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connections.put("118", Stream.of("116","117").collect(Collectors.toSet()));
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connections.put("210", Stream.of("98","274").collect(Collectors.toSet()));
connections.put("211", Stream.of("11","191").collect(Collectors.toSet()));
connections.put("212", Stream.of("141").collect(Collectors.toSet()));
connections.put("213", Stream.of("53","168").collect(Collectors.toSet()));
connections.put("214", Stream.of("51","300").collect(Collectors.toSet()));
connections.put("215", Stream.of("41","275").collect(Collectors.toSet()));
connections.put("216", Stream.of("20","202").collect(Collectors.toSet()));
connections.put("217", Stream.of("192","282").collect(Collectors.toSet()));
connections.put("218", Stream.of("43","63").collect(Collectors.toSet()));
connections.put("219", Stream.of("134","221","134","221").collect(Collectors.toSet()));
connections.put("220", Stream.of("238","293").collect(Collectors.toSet()));
connections.put("221", Stream.of("75","219","75","219").collect(Collectors.toSet()));
connections.put("222", Stream.of("126","145").collect(Collectors.toSet()));
connections.put("223", Stream.of("95","259").collect(Collectors.toSet()));
connections.put("224", Stream.of("13","155","261","275","294").collect(Collectors.toSet()));
connections.put("225", Stream.of("127","295").collect(Collectors.toSet()));
connections.put("226", Stream.of("101","150").collect(Collectors.toSet()));
connections.put("227", Stream.of("294").collect(Collectors.toSet()));
connections.put("228", Stream.of("235","272","235","272").collect(Collectors.toSet()));
connections.put("229", Stream.of("154","240").collect(Collectors.toSet()));
connections.put("230", Stream.of("80","299").collect(Collectors.toSet()));
connections.put("231", Stream.of("9","187").collect(Collectors.toSet()));
connections.put("232", Stream.of("157","278").collect(Collectors.toSet()));
connections.put("233", Stream.of("1","176").collect(Collectors.toSet()));
connections.put("234", Stream.of("209","250").collect(Collectors.toSet()));
connections.put("235", Stream.of("99","228","99","228","99","146").collect(Collectors.toSet()));
connections.put("236", Stream.of("140","185").collect(Collectors.toSet()));
connections.put("237", Stream.of("61","120").collect(Collectors.toSet()));
connections.put("238", Stream.of("177","220").collect(Collectors.toSet()));
connections.put("239", Stream.of("59","169").collect(Collectors.toSet()));
connections.put("240", Stream.of("229","300").collect(Collectors.toSet()));
connections.put("241", Stream.of("208","264").collect(Collectors.toSet()));
connections.put("242", Stream.of("45").collect(Collectors.toSet()));
connections.put("243", Stream.of("164","294","164","294").collect(Collectors.toSet()));
connections.put("244", Stream.of("55","190","35","271").collect(Collectors.toSet()));
connections.put("245", Stream.of("113","280").collect(Collectors.toSet()));
connections.put("246", Stream.of("153","164","203","288").collect(Collectors.toSet()));
connections.put("247", Stream.of("272","284","272","284").collect(Collectors.toSet()));
connections.put("248", Stream.of("11","253").collect(Collectors.toSet()));
connections.put("249", Stream.of("13","48").collect(Collectors.toSet()));
connections.put("250", Stream.of("234","251").collect(Collectors.toSet()));
connections.put("251", Stream.of("5","250").collect(Collectors.toSet()));
connections.put("252", Stream.of("41","174","175").collect(Collectors.toSet()));
connections.put("253", Stream.of("94","248").collect(Collectors.toSet()));
connections.put("254", Stream.of("25","87","25","87").collect(Collectors.toSet()));
connections.put("255", Stream.of("68","88").collect(Collectors.toSet()));
connections.put("256", Stream.of("12","257").collect(Collectors.toSet()));
connections.put("257", Stream.of("59","256").collect(Collectors.toSet()));
connections.put("258", Stream.of("126","191","102","151").collect(Collectors.toSet()));
connections.put("259", Stream.of("26","223").collect(Collectors.toSet()));
connections.put("260", Stream.of("121","301").collect(Collectors.toSet()));
connections.put("261", Stream.of("224").collect(Collectors.toSet()));
connections.put("262", Stream.of("2","166","3","166").collect(Collectors.toSet()));
connections.put("263", Stream.of("8","139").collect(Collectors.toSet()));
connections.put("264", Stream.of("52","108","241","1","110").collect(Collectors.toSet()));
connections.put("265", Stream.of("160","302").collect(Collectors.toSet()));
connections.put("266", Stream.of("267").collect(Collectors.toSet()));
connections.put("267", Stream.of("129","266").collect(Collectors.toSet()));
connections.put("268", Stream.of("15","21").collect(Collectors.toSet()));
connections.put("269", Stream.of("78","199","78","199").collect(Collectors.toSet()));
connections.put("270", Stream.of("125","125").collect(Collectors.toSet()));
connections.put("271", Stream.of("197","244").collect(Collectors.toSet()));
connections.put("272", Stream.of("228","247","228","247","107","197").collect(Collectors.toSet()));
connections.put("273", Stream.of("26").collect(Collectors.toSet()));
connections.put("274", Stream.of("154","210").collect(Collectors.toSet()));
connections.put("275", Stream.of("215","224").collect(Collectors.toSet()));
connections.put("276", Stream.of("89","102","89","191").collect(Collectors.toSet()));
connections.put("277", Stream.of("159","192").collect(Collectors.toSet()));
connections.put("278", Stream.of("87","148","232","284","87","136","13").collect(Collectors.toSet()));
connections.put("279", Stream.of("62").collect(Collectors.toSet()));
connections.put("280", Stream.of("185","245").collect(Collectors.toSet()));
connections.put("281", Stream.of("144","172","94","201").collect(Collectors.toSet()));
connections.put("282", Stream.of("147","217").collect(Collectors.toSet()));
connections.put("283", Stream.of("155","200","291").collect(Collectors.toSet()));
connections.put("284", Stream.of("87","247","87","247","107","278").collect(Collectors.toSet()));
connections.put("285", Stream.of("72","181").collect(Collectors.toSet()));
connections.put("286", Stream.of("74","96").collect(Collectors.toSet()));
connections.put("287", Stream.of("93","301").collect(Collectors.toSet()));
connections.put("288", Stream.of("36","199","36","199","43","246").collect(Collectors.toSet()));
connections.put("289", Stream.of("94","142").collect(Collectors.toSet()));
connections.put("290", Stream.of("115","209").collect(Collectors.toSet()));
connections.put("291", Stream.of("42","200","283").collect(Collectors.toSet()));
connections.put("292", Stream.of("17","74").collect(Collectors.toSet()));
connections.put("293", Stream.of("220").collect(Collectors.toSet()));
connections.put("294", Stream.of("3","243","224","227","3","243").collect(Collectors.toSet()));
connections.put("295", Stream.of("76","225").collect(Collectors.toSet()));
connections.put("296", Stream.of("71","142").collect(Collectors.toSet()));
connections.put("297", Stream.of("113","137").collect(Collectors.toSet()));
connections.put("298", Stream.of("299").collect(Collectors.toSet()));
connections.put("299", Stream.of("230","298").collect(Collectors.toSet()));
connections.put("300", Stream.of("37","214","240").collect(Collectors.toSet()));
connections.put("301", Stream.of("260","287").collect(Collectors.toSet()));
connections.put("302", Stream.of("31","265").collect(Collectors.toSet()));
underground = new Graph<>(stations, connections);
routeFinder = new RouteFinder<>(underground, new HaversineScorer(), new HaversineScorer());
}
@Test
public void findRoute() {
List<Station> route = routeFinder.findRoute(underground.getNode("74"), underground.getNode("7"));
System.out.println(route.stream().map(Station::getName).collect(Collectors.toList()));
}
}

42
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/astar/underground/Station.java Normal file
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@ -0,0 +1,42 @@
package com.baeldung.algorithms.astar.underground;
import java.util.StringJoiner;
import com.baeldung.algorithms.astar.GraphNode;
public class Station implements GraphNode {
private final String id;
private final String name;
private final double latitude;
private final double longitude;
public Station(String id, String name, double latitude, double longitude) {
this.id = id;
this.name = name;
this.latitude = latitude;
this.longitude = longitude;
}
@Override
public String getId() {
return id;
}
public String getName() {
return name;
}
public double getLatitude() {
return latitude;
}
public double getLongitude() {
return longitude;
}
@Override
public String toString() {
return new StringJoiner(", ", Station.class.getSimpleName() + "[", "]").add("id='" + id + "'")
.add("name='" + name + "'").add("latitude=" + latitude).add("longitude=" + longitude).toString();
}
}