/MapView/Map/RMDBTileImage.m

 1//
 2// RMDBTileImage.m
 3//
 4// Copyright (c) 2009, Frank Schroeder, SharpMind GbR
 5// All rights reserved.
 6//
 7// Redistribution and use in source and binary forms, with or without
 8// modification, are permitted provided that the following conditions are met:
 9//
10// * Redistributions of source code must retain the above copyright notice, this
11//   list of conditions and the following disclaimer.
12// * Redistributions in binary form must reproduce the above copyright notice,
13//   this list of conditions and the following disclaimer in the documentation
14//   and/or other materials provided with the distribution.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26// POSSIBILITY OF SUCH DAMAGE.
27
28// RMDBTileImage is a tile image implementation for the RMDBMapSource.
29// 
30// See RMDBMapSource.m for a full documentation on the database schema.
31//    
32
33
34#import "RMDBTileImage.h"
35
36#define FMDBErrorCheck(db)		{ if ([db hadError]) { NSLog(@"DB error %d on line %d: %@", [db lastErrorCode], __LINE__, [db lastErrorMessage]); } }
37
38@implementation RMDBTileImage
39
40- (id)initWithTile:(RMTile)_tile fromDB:(FMDatabase*)db {
41	self = [super initWithTile:_tile];
42	if (self != nil) {
43		// get the unique key for the tile
44		NSNumber* key = [NSNumber numberWithLongLong:RMTileKey(_tile)];
45		RMLog(@"fetching tile %@ (y:%d, x:%d)@%d", key, _tile.y, _tile.x, _tile.zoom);
46		
47		// fetch the image from the db
48		FMResultSet* rs = [db executeQuery:@"select image from tiles where tilekey = ?", key];
49		FMDBErrorCheck(db);
50		if ([rs next]) {
51			[self updateImageUsingImage:[[[UIImage alloc] initWithData:[rs dataForColumn:@"image"]] autorelease]];
52		}
53		[rs close];
54	}
55	return self;
56}
57
58@end