jens@8: //
jens@8: //  Game-Persistence.m
jens@8: //  GeekGameBoard
jens@8: //
jens@8: //  Created by Jens Alfke on 3/16/08.
jens@8: //  Copyright 2008 __MyCompanyName__. All rights reserved.
jens@8: //
jens@8: 
jens@8: #import "Game-Persistence.h"
jens@8: 
jens@8: 
jens@8: static NSDictionary* parseURLFields( NSURL* url );
jens@8: 
jens@8: 
jens@8: @implementation Game (Persistence)
jens@8: 
jens@8: 
jens@8: static NSMutableDictionary *sPersistentGames;
jens@8: 
jens@8: 
jens@8: - (id) initWithCoder: (NSCoder*)decoder
jens@8: {
jens@8:     self = [self init];
jens@8:     if( self ) {
jens@8:         _players = [[decoder decodeObjectForKey: @"players"] mutableCopy];
jens@8:         _states  = [[decoder decodeObjectForKey: @"states"] mutableCopy];
jens@8:         _moves   = [[decoder decodeObjectForKey: @"moves"] mutableCopy];
jens@8:         self.currentTurn = self.maxTurn;
jens@8:     }
jens@8:     return self;
jens@8: }
jens@8: 
jens@8: 
jens@8: - (void) encodeWithCoder: (NSCoder*)coder
jens@8: {
jens@8:     [coder encodeObject: _players forKey: @"players"];
jens@8:     [coder encodeObject: _states  forKey: @"states"];
jens@8:     [coder encodeObject: _moves   forKey: @"moves"];
jens@8: }
jens@8: 
jens@8: 
jens@8: - (NSURL*) asURL
jens@8: {
jens@8:     return [NSURL URLWithString: 
jens@8:             [NSString stringWithFormat: @"game:type=%@&id=%@&turn=%u&move=%@",
jens@8:              [[self class] identifier], _uniqueID, self.currentTurn,_moves.lastObject]];
jens@8: }
jens@8: 
jens@8: 
jens@8: + (Game*) gameWithURL: (NSURL*)url
jens@8: {
jens@8:     if( 0 != [@"game" caseInsensitiveCompare: url.scheme] )
jens@8:         return nil;
jens@8:     NSDictionary *fields = parseURLFields(url);
jens@8:     NSString *type = [fields objectForKey: @"type"];
jens@8:     NSString *uuid = [fields objectForKey: @"id"];
jens@8:     int turn = [[fields objectForKey: @"turn"] intValue];
jens@8:     if( !type || !uuid || turn<=0 )
jens@8:         return nil;
jens@8:     
jens@8:     Game *game = [sPersistentGames objectForKey: uuid];
jens@8:     if( game ) {
jens@8:         if( ![type isEqualToString: [[game class] identifier]] )
jens@8:             return nil;
jens@8:     } else if( turn == 1 ) {
jens@8:         Class gameClass = NSClassFromString( [type stringByAppendingString: @"Game"] );
jens@8:         if( ! gameClass || ! [gameClass isSubclassOfClass: [Game class]] )
jens@8:             return nil;
jens@8:         game = [[gameClass alloc] initWithUniqueID: uuid];
jens@8:         [game setNumberOfPlayers: 2];
jens@8:         if( ! sPersistentGames )
jens@8:             sPersistentGames = [[NSMutableDictionary alloc] init];
jens@8:         [sPersistentGames setObject: game forKey: uuid];
jens@8:         [game release];
jens@8:     }
jens@8:     return game;
jens@8: }
jens@8: 
jens@8: 
jens@8: - (BOOL) addMoveFromURL: (NSURL*)url
jens@8: {
jens@8:     NSDictionary *fields = parseURLFields(url);
jens@8:     NSString *uuid = [fields objectForKey: @"id"];
jens@8:     NSString *move = [fields objectForKey: @"move"];
jens@8:     int turn = [[fields objectForKey: @"turn"] intValue];
jens@8:     return [uuid isEqualToString: self.uniqueID]
jens@8:         && turn==self.currentTurn
jens@8:         && move.length > 0
jens@8:         && [self applyMoveString: move];
jens@8: }
jens@8: 
jens@8: 
jens@8: 
jens@8: @end
jens@8: 
jens@8: 
jens@8: 
jens@8: static NSDictionary* parseURLFields( NSURL* url )
jens@8: {
jens@8:     // Parse the URL into key-value pairs:
jens@8:     NSMutableDictionary *fields = [NSMutableDictionary dictionary];
jens@8:     for( NSString *field in [url.resourceSpecifier componentsSeparatedByString: @"&"] ) {
jens@8:         NSRange e = [field rangeOfString: @"="];
jens@8:         NSString *key, *value;
jens@8:         if( e.length>0 ) {
jens@8:             key = [field substringToIndex: e.location];
jens@8:             value = [field substringFromIndex: NSMaxRange(e)];
jens@8:         } else {
jens@8:             key= field;
jens@8:             value = @"";
jens@8:         }
jens@8:         [fields setObject: value forKey: key];
jens@8:     }
jens@8:     return fields;
jens@8: }