ImageFetchOperation.m

//
//  ImageFetcherOperation.m
//
//  Created by Alexander Repty on 28.09.09.
// 
//  Copyright (c) 2009, Alexander Repty
//  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.
//  Neither the name of Alexander Repty nor the names of his contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//  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 HOLDER 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 "ImageFetchOperation.h"

@implementation ImageFetchOperation

- (id)initWithURL:(NSURL *)url delegate:(id<ImageFetcherDelegate>)delegate {
	if (self = [super init]) {
		_url = [url copy];
		_delegate = delegate;
	}
	return self;
}

- (void)dealloc {
	[_url release];
	[super dealloc];
}

- (void)main {
	NSImage *image = nil;
	NSError *error = nil;
	
	NS_DURING
	
	if ([self isCancelled]) {
		NS_VOIDRETURN;
	}
	
	NSData *data = [NSData dataWithContentsOfURL:_url options:NSDataReadingUncached error:&error];
	if (nil != error) {
		[(NSObject *)_delegate performSelectorOnMainThread:@selector(errorOccurred:) withObject:error waitUntilDone:NO];
		NS_VOIDRETURN;
	}

	image = [[NSImage alloc] initWithData:data];
	
	NS_HANDLER
	NS_ENDHANDLER

	sleep(2); // for illustration purposes
	
	[(NSObject *)_delegate performSelectorOnMainThread:@selector(didReceiveImage:) withObject:image waitUntilDone:NO];
}

@end