RMAbstractWebMapSource.m
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//
// RMWebMapSource.m
//
// Copyright (c) 2009, Frank Schroeder, SharpMind GbR
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#import "RMAbstractWebMapSource.h"
#import "RMTileCache.h"
#import "RMTileImage.h"
@implementation RMAbstractWebMapSource
- (id)init
{
if (!(self = [super init]))
return nil;
return self;
}
- (NSURL *)URLForTile:(RMTile)tile
{
@throw [NSException exceptionWithName:@"RMAbstractMethodInvocation"
reason:@"URLForTile: invoked on AbstractMercatorWebSource. Override this method when instantiating abstract class."
userInfo:nil];
}
- (UIImage *)imageForTile:(RMTile)tile inCache:(RMTileCache *)tileCache
{
UIImage *image = nil;
tile = [[self mercatorToTileProjection] normaliseTile:tile];
image = [tileCache cachedImage:tile withCacheKey:[self uniqueTilecacheKey]];
if (image) return image;
[[NSNotificationCenter defaultCenter] postNotificationName:RMTileRequested object:nil];
[tileCache retain];
NSData *tileData = [NSData dataWithContentsOfURL:[self URLForTile:tile]];
if (tileData && [tileData length]) {
image = [UIImage imageWithData:tileData];
if (image) [tileCache addImage:image forTile:tile withCacheKey:[self uniqueTilecacheKey]];
}
[tileCache release];
[[NSNotificationCenter defaultCenter] postNotificationName:RMTileRetrieved object:nil];
if (!image) return [RMTileImage errorTile];
return image;
}
@end