ImageClient2-asynch/NSURLLoader.m

/*
 
File: NSURLLoader.m
 
Abstract: CFNetwork ImageClient Sample
 
Version: 1.0
 
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subject to these terms, Apple grants you a personal, non-exclusive
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Inc. may be used to endorse or promote products derived from the Apple
Software without specific prior written permission from Apple.  Except
as expressly stated in this notice, no other rights or licenses, express
or implied, are granted by Apple herein, including but not limited to
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other works in which the Apple Software may be incorporated.
 
The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
 
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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Copyright (c) 2005 Apple Computer, Inc., All Rights Reserved
 
*/ 
 
#import "NSURLLoader.h"
#import "ImageClient.h"
#import "CFNetworkLoader.h"
 
 
@implementation NSURLLoader
- (id)initWithImageClient:(ImageClient *)imgClient {
    if (self = [super init]) {
        imageClient = imgClient; // No retain because the ImageClient instance is retaining us
    }
    return self;
}
 
- (void) dealloc {
    [self cancelLoad];
    [super dealloc];
}
 
- (void)loadURL:(NSURL *)url {
    // Cancel any load currently in progress
    [self cancelLoad];
    
    // Create an empty data to receive bytes from the download
    data = [[NSMutableData alloc] init];
 
    // Start the download
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
 
- (void)cancelLoad {
    if (connection) {
        [connection cancel];
        [connection release];
        connection = nil;
    }
    if (data) {
        [data release];
        data = nil;
    }
}
 
/* NSURLConnection delegate methods */
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)newData {
    [data appendData:newData];
}
 
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    [imageClient setImageData:data];
    [self cancelLoad]; // This shuts down the connection for us
}
 
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    [imageClient errorOccurredLoadingImage];
    [self cancelLoad]; // This shuts down the connection for us
}
@end