RMCachedTileSource.m
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//
// RMCachedTileSource.m
// MapView
//
// Created by Joseph Gentle on 25/09/08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import "RMCachedTileSource.h"
#import "RMTileCache.h"
@implementation RMCachedTileSource
- (id) initWithSource: (id<RMTileSource>) _source
{
if ([_source isKindOfClass:[RMCachedTileSource class]])
{
[self dealloc];
return _source;
}
if (![super init])
return nil;
tileSource = [_source retain];
cache = [[RMTileCache alloc] initWithTileSource:tileSource];
return self;
}
- (void) dealloc
{
[tileSource release];
[cache release];
[super dealloc];
}
+ (RMCachedTileSource*) cachedTileSourceWithSource: (id<RMTileSource>) source
{
// Doing this fixes a strange build warning...
id theSource = source;
return [[[RMCachedTileSource alloc] initWithSource:theSource] autorelease];
}
-(RMTileImage *) tileImage: (RMTile) tile
{
RMTileImage *cachedImage = [cache cachedImage:tile];
if (cachedImage != nil)
{
return cachedImage;
}
else
{
RMTileImage *image = [tileSource tileImage:tile];
[cache addTile:tile WithImage:image];
return image;
}
}
-(id<RMMercatorToTileProjection>) mercatorToTileProjection
{
return [tileSource mercatorToTileProjection];
}
-(RMProjection*) projection
{
return [tileSource projection];
}
- (id<RMTileSource>) underlyingTileSource
{
// I'm assuming that our tilesource isn't itself a cachedtilesource.
// This class's initialiser should make sure of that.
return tileSource;
}
@end