/**
* Given a map between a string and an object of unknown type, attempt to retrieve what value is
* mapped to from the specified string and validate that the actual type matches the specified
* class.
*
* @return Null if the types do not match, or the value
*/
private static Object validateAndGet(Map<String, Object> m, String s, Class<?> c)
throws MissingMappingException, UnexpectedTypeException {
Object o = m.get(s);
if (o == null) throw new MissingMappingException(s);
if (!c.isAssignableFrom(o.getClass()))
throw new UnexpectedTypeException(s, c.toString(), o.getClass().toString());
else return o;
}
@SuppressWarnings({"unchecked", "rawtypes"})
public static void main(String[] args) throws IOException {
boolean useArguments = false;
Map config = null;
try {
yamlInstance = new Yaml();
/*
* Try to load configuration file
*/
FileReader configFile = new FileReader(YAML_PATH + CONFIGURATION_FILE);
config = (Map) yamlInstance.load(configFile);
} catch (FileNotFoundException e) {
System.out.println(
"Could not load configuration file. Using program " + "arguments instead.");
useArguments = true;
}
/* Scan for program arguments */
int port = -1;
try {
if (useArguments) port = Integer.parseInt(args[0]);
else
// take the port number from the config file
port = (Integer) config.get("port");
} catch (ArrayIndexOutOfBoundsException e) {
System.err.println("DungeonServer: specify a port to which to bind");
System.out.println(usage());
System.exit(1);
}
/* Attempt to bind to port */
ServerSocket server = null;
try {
server = new ServerSocket(port);
} catch (IOException e) {
System.err.printf("DungeonServer: could not listen on port %d\n", port);
System.exit(2);
}
System.out.printf("bound to port %d\n", port);
System.out.println("loading universe:");
/* Load universe */
try {
System.out.println("\tfinding universe file");
FileReader universeFile = null;
if (useArguments) universeFile = new FileReader(YAML_PATH + DEFAULT_UNIVERSE_FILE);
else universeFile = new FileReader(YAML_PATH + config.get("world") + ".universe.yml");
Object[] docs = new Object[3];
Map<String, Object> preamble = null;
Map<String, Map<String, Object>> rooms = null, items = null;
try {
System.out.println("\tchecking universe file");
int i = 0;
for (Object o : yamlInstance.loadAll(universeFile)) docs[i++] = o;
preamble = (Map<String, Object>) docs[0];
rooms = (Map<String, Map<String, Object>>) docs[1];
items = (Map<String, Map<String, Object>>) docs[2];
if (preamble == null || rooms == null || items == null) throw new NullPointerException();
} catch (ArrayIndexOutOfBoundsException e) {
System.err.println(
"DungeonServer: error parsing universe " + "file: too many documents in universe file");
System.exit(3);
} catch (NullPointerException e) {
System.err.println(
"DungeonServer: error parsing universe " + "file: too few documents in universe file");
System.exit(3);
}
/*
* Used after parsing rooms to set universe parameters
*/
boolean doWeather = false;
String spawnRoomID = null;
int timescale = -1;
try {
System.out.println("\treading preamble");
/*
* Load universe parameters from the preamble
*/
doWeather = (Boolean) validateAndGet(preamble, "weather", Boolean.class);
spawnRoomID = (String) validateAndGet(preamble, "spawn", String.class);
timescale = (Integer) validateAndGet(preamble, "timescale", Integer.class);
} catch (Exception e) {
System.err.println("DungeonServer: failed parsing preamble (" + e.getMessage() + ")");
System.exit(4);
}
/*
* Loop through room definitions in universe file
*/
/**
* This hash map is used to resolve references from one room to another. Each time a room is
* parsed, it is added to this map, and henceforth back references to the newly added room
* will be resolved by checking this map.
*/
HashMap<String, Room> knownRooms = new HashMap<String, Room>();
/**
* This list is maintained to easily check at the end of parsing if there are still references
* to unseen rooms.
*/
ArrayList<String> unseenRooms = new ArrayList<String>();
/**
* This is a list of triples (A, B, C) such that A is a room waiting for a reference to
* another room, C, through a direction B. For A and B, the string ID of the rooms are used
* (the same key used in the knownRooms hash map). This list is used whenever a room's exit
* references cannot actually be resolved because the destination room has not yet been
* parsed. At the end of parsing, as long as the unseenRooms list is empty, this list is
* traversed to resolve the remaining references.
*/
ArrayList<Triple<String, Direction, String>> unresolved;
unresolved = new ArrayList<Triple<String, Direction, String>>();
String thisRoomID = null;
try {
System.out.println("\tparsing rooms");
for (Map.Entry<String, Map<String, Object>> m : rooms.entrySet()) {
thisRoomID = m.getKey();
Map<String, Object> thisMap = m.getValue();
String roomName = (String) validateAndGet(thisMap, "name", String.class);
String description = (String) validateAndGet(thisMap, "description", String.class);
Hashtable<Pair<DayPart, Weather>, String> details;
details = getDetails(thisMap);
Room r = new Room(roomName, description, details);
if (thisMap.containsKey("neverUseArticle")) {
boolean neverUseArticle =
(Boolean) validateAndGet(thisMap, "neverUseArticle", Boolean.class);
r.setNeverUseArticle(neverUseArticle);
}
if (unseenRooms.contains(thisRoomID)) unseenRooms.remove(thisRoomID);
knownRooms.put(thisRoomID, r);
/*
* Process exits out of this room
*/
Map<String, String> exits = (Map) validateAndGet(thisMap, "exits", Map.class);
for (Map.Entry<String, String> exit : exits.entrySet()) {
String thisDirection = exit.getKey();
String toRoomID = exit.getValue();
/*
* Verify the direction from the file
*/
Direction dir;
dir = Direction.fromString(thisDirection);
if (dir == null) throw new InvalidDirectionException(thisDirection);
/*
* Look up the destination room in the hash map
*/
if (knownRooms.containsKey(toRoomID)) r.addExit(dir, knownRooms.get(toRoomID));
else {
if (!unseenRooms.contains(toRoomID)) unseenRooms.add(toRoomID);
Triple<String, Direction, String> t;
t = new Triple<String, Direction, String>(thisRoomID, dir, toRoomID);
unresolved.add(t);
}
}
}
} catch (Exception e) {
System.err.println(
"DungeonServer: failed parsing room '" + thisRoomID + "' (" + e.getMessage() + ")");
System.exit(4);
}
if (!unseenRooms.isEmpty()) throw new UnresolvedReferenceException(unseenRooms);
/*
* Invariant: There were no references to undefined rooms in the
* file. Invariant: All the rooms in the file have been
* instantiated.
*
* All rooms in the universe file have been parsed, but there may
* still be exits waiting to be added because their destination was
* not yet parsed at the time. Now loop through the unresolved list
* to set them up.
*/
for (Triple<String, Direction, String> t : unresolved) {
Room fromRoom = knownRooms.get(t.first);
Room toRoom = knownRooms.get(t.third);
Direction dir = t.second;
fromRoom.addExit(dir, toRoom);
}
/*
* Invariant: All exits in the file have been set up among the
* rooms.
*/
Room spawnRoom = knownRooms.get(spawnRoomID);
universe = new DungeonUniverse(spawnRoom, doWeather, timescale, knownRooms.values());
universeFile.close();
} catch (Exception e) {
System.err.println("DungeonServer: failed loading universe " + "(" + e.getMessage() + ")");
System.exit(2);
}
System.out.println("loaded universe");
/* Start narrator */
try {
narrator = new DungeonNarrator();
} catch (Exception e) {
System.err.println("DungeonServer: failed starting narrator");
System.exit(3);
}
System.out.println("started narrator");
/* Start the game tick */
try {
tick = new DungeonGameTick();
tick.start();
} catch (Exception e) {
System.err.println("DungeonServer: failed starting game tick");
System.exit(3);
}
System.out.println("started game tick");
/* Start accepting events */
try {
events = new DungeonDispatcher();
events.start();
} catch (Exception e) {
System.err.println("DungeonServer: failed starting event queue");
System.exit(3);
}
System.out.println("started event queue");
/* Listen for clients */
try {
System.out.println("listening for clients");
while (true) new DungeonConnectionThread(server.accept()).start();
} catch (IOException e) {
System.err.printf("DungeonServer: failed accepting client on port %d\n", port);
System.exit(2);
} finally {
server.close();
}
}