/*

File: NSURLLoader.m

Abstract: CFNetwork ImageClient Sample

Version: 1.0

Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

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subject to these terms, Apple grants you a personal, non-exclusive

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Software, with or without modifications, in source and/or binary forms;

provided that if you redistribute the Apple Software in its entirety and

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text and disclaimers in all such redistributions of the Apple Software. 

Neither the name, trademarks, service marks or logos of Apple Computer,

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

any patent rights that may be infringed by your derivative works or by

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

OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

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*/ 

#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];

    [url release];

    [super dealloc];

}

- (void)loadURL:(NSURL *)theURL {

    // Cancel any load currently in progress

    [self cancelLoad];

    // Create an empty data to receive bytes from the download

    data = [[NSMutableData alloc] init];

    if (url) [url release];

    url = theURL;

    [url retain];

    // 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 {

    CFNetDiagnosticRef diagnostics = CFNetDiagnosticCreateWithURL(NULL, (CFURLRef)url);

    [imageClient errorOccurredLoadingImage:diagnostics];

    [self cancelLoad]; // This shuts down the connection for us

}

@end