#import "RssLoader.h"

@interface RssLoader ()

- (void)dispatchLoadingOperationWithURL:(NSURL *)url;

- (RssItem *)getRssItemFromXmlElement:(CXMLElement *)xmlElement;

- (void)fetchRssFromUrl:(NSURL*)url;

@implementation RssLoader

@synthesize delegate;

@synthesize loaded;

- (id)init

{

if([super init] != nil)

self.loaded = NO;

return self;

}

- (void)loadWithURL:(NSURL *)url

{

[self dispatchLoadingOperationWithURL:url];

}

- (void)dispatchLoadingOperationWithURL:(NSURL *)url

{

NSOperationQueue *queue = [NSOperationQueue new];

NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self

selector:@selector(fetchRssFromUrl:)

object:url];

[queue addOperation:operation];

}

- (RssItem *)getRssItemFromXmlElement:(CXMLElement *)xmlElement

{

return [[RssItem alloc]initWithXmlElement:xmlElement];

}

- (void)fetchRssFromUrl:(NSURL *)url

{

NSError *error;

CXMLDocument *parser = [[CXMLDocument alloc] initWithContentsOfURL:url options:0 error:&error];

if(!parser)

{

[self.delegate performSelectorOnMainThread:@selector(updateFailedWithError:) withObject:error waitUntilDone:YES];

return;

}

self.loaded = YES;

NSArray *xmlElements = [[parser rootElement] nodesForXPath:@"channel//item" error:nil];

NSMutableArray* rssItems = [NSMutableArray arrayWithCapacity:xmlElements.count];

for(CXMLElement *xmlElement in xmlElements)

[rssItems addObject: [self getRssItemFromXmlElement:xmlElement]];

[self.delegate performSelectorOnMainThread:@selector(rssItemsUpdated:) withObject:rssItems waitUntilDone:YES];

}