RMTileCacheDownloadOperation.m
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//
// RMTileCacheDownloadOperation.m
//
// Copyright (c) 2008-2013, 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 "RMTileCacheDownloadOperation.h"
#import "RMAbstractWebMapSource.h"
#import "RMConfiguration.h"
@implementation RMTileCacheDownloadOperation
{
RMTile _tile;
__weak id <RMTileSource>_source;
__weak RMTileCache *_cache;
}
- (id)initWithTile:(RMTile)tile forTileSource:(id <RMTileSource>)source usingCache:(RMTileCache *)cache
{
if (!(self = [super init]))
return nil;
NSAssert([source isKindOfClass:[RMAbstractWebMapSource class]], @"only web-based tile sources are supported for downloading");
_tile = tile;
_source = source;
_cache = cache;
return self;
}
- (void)main
{
if ( ! _source || ! _cache)
[self cancel];
if ([self isCancelled])
return;
if ( ! [_cache cachedImage:_tile withCacheKey:[_source uniqueTilecacheKey] bypassingMemoryCache:YES])
{
if ([self isCancelled])
return;
NSURL *tileURL = [(RMAbstractWebMapSource *)_source URLForTile:_tile];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:tileURL];
request.cachePolicy = NSURLRequestReloadIgnoringLocalCacheData;
NSError *error = nil;
NSData *data = [NSURLConnection sendBrandedSynchronousRequest:request
returningResponse:nil
error:&error];
if ( ! data || error != nil)
{
if (error != nil)
{
self.error = error;
}
else
{
self.error = [NSError errorWithDomain:NSURLErrorDomain
code:NSURLErrorUnknown
userInfo:nil];
}
[self cancel];
}
else
{
[_cache addDiskCachedImageData:data forTile:_tile withCacheKey:[_source uniqueTilecacheKey]];
}
}
}
@end