RMCachedTileSource.m
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//
// RMCachedTileSource.m
//
// Copyright (c) 2008, Route-Me Contributors
// 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 "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;
}
-(float) minZoom
{
return [tileSource minZoom];
}
-(float) maxZoom
{
return [tileSource maxZoom];
}
- (void) didReceiveMemoryWarning
{
[cache didReceiveMemoryWarning];
}
@end