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//
// AcidCowFeedburnerParser.m
// PicCast
//
// Created by Matthew Handler on 4/15/11.
// Copyright 2011 Earl Industries. All rights reserved.
//
#import "AcidCowFeedburnerParser.h"
#import "Topic.h"
@implementation AcidCowFeedburnerParser
@synthesize currentString, currentTopic, parseFormatter, xmlData, rssConnection, downloadAndParsePool;
- (void)downloadAndParse:(NSURL *)url {
NSLog(@"downloadAndParse");
self.downloadAndParsePool = [[NSAutoreleasePool alloc] init];
done = NO;
self.parseFormatter = [[[NSDateFormatter alloc] init] autorelease];
[parseFormatter setDateStyle:NSDateFormatterLongStyle];
[parseFormatter setTimeStyle:NSDateFormatterNoStyle];
// necessary because iTunes RSS feed is not localized, so if the device region has been set to other than US
// the date formatter must be set to US locale in order to parse the dates
[parseFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"US"] autorelease]];
self.xmlData = [NSMutableData data];
//[[NSURLCache sharedURLCache] removeAllCachedResponses];
NSURLRequest *theRequest = [NSURLRequest requestWithURL:url];
// create the connection with the request and start loading the data
rssConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
[self performSelectorOnMainThread:@selector(downloadStarted) withObject:nil waitUntilDone:NO];
if (rssConnection != nil) {
do {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
} while (!done);
}
self.rssConnection = nil;
self.parseFormatter = nil;
self.currentTopic = nil;
[downloadAndParsePool release];
self.downloadAndParsePool = nil;
}
#pragma mark NSURLConnection Delegate methods
/*
Disable caching so that each time we run this app we are starting with a clean slate. You may not want to do this in your application.
*/
//- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {
// return nil;
//}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
done = YES;
[self performSelectorOnMainThread:@selector(parseError:) withObject:error waitUntilDone:NO];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[xmlData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSLog(@"finishedLoading");
[self performSelectorOnMainThread:@selector(downloadEnded) withObject:nil waitUntilDone:NO];
[self convertXMLData];
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:xmlData];
parser.delegate = self;
self.currentString = [NSMutableString string];
//NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate];
[parser parse];
//NSTimeInterval duration = [NSDate timeIntervalSinceReferenceDate] - start;
//[self performSelectorOnMainThread:@selector(addToParseDuration:) withObject:[NSNumber numberWithDouble:duration] waitUntilDone:NO];
[self performSelectorOnMainThread:@selector(parseEnded) withObject:nil waitUntilDone:NO];
[parser release];
self.currentString = nil;
self.xmlData = nil;
// Set the condition which ends the run loop.
done = YES;
}
// needed to convert feedburners xml into utf-8 because the iphone parser breaks on windows-1251
- (void)convertXMLData {
NSString *string = [[NSString alloc] initWithData:xmlData encoding:NSWindowsCP1251StringEncoding];
string = [string stringByReplacingOccurrencesOfString:@"encoding=\"windows-1251\"" withString:@""];
// [xmlData release];
// xmlData = nil;
xmlData = [[NSMutableData dataWithData:[string dataUsingEncoding:NSUTF8StringEncoding]] retain];
}
#pragma mark Parsing support methods
static const NSUInteger kAutoreleasePoolPurgeFrequency = 20;
- (void)finishedCurrentTopic {
[self performSelectorOnMainThread:@selector(parsedTopic:) withObject:currentTopic waitUntilDone:NO];
// performSelectorOnMainThread: will retain the object until the selector has been performed
// setting the local reference to nil ensures that the local reference will be released
self.currentTopic = nil;
countOfParsedTopics++;
// Periodically purge the autorelease pool. The frequency of this action may need to be tuned according to the
// size of the objects being parsed. The goal is to keep the autorelease pool from growing too large, but
// taking this action too frequently would be wasteful and reduce performance.
if (countOfParsedTopics == kAutoreleasePoolPurgeFrequency) {
[downloadAndParsePool release];
self.downloadAndParsePool = [[NSAutoreleasePool alloc] init];
countOfParsedTopics = 0;
}
}
#pragma mark NSXMLParser Parsing Callbacks
// Constants for the XML element names that will be considered during the parse.
// Declaring these as static constants reduces the number of objects created during the run
// and is less prone to programmer error.
static NSString *kName_Item = @"item";
static NSString *kName_Title = @"title";
static NSString *kName_Category = @"category";
static NSString *kName_Creator = @"dc:creator";
static NSString *kName_Description = @"description";
static NSString *kName_ReleaseDate = @"pubDate";
static NSString *kName_Guid = @"guid";
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *) qualifiedName attributes:(NSDictionary *)attributeDict {
//NSLog(@"%@", elementName);
if ([elementName isEqualToString:kName_Item]) {
self.currentTopic = [[[Topic alloc] init] autorelease];
} else if ([elementName isEqualToString:kName_Title]
|| [elementName isEqualToString:kName_Category]
|| [elementName isEqualToString:kName_Guid]
|| [elementName isEqualToString:kName_Creator]
|| [elementName isEqualToString:kName_Description]
|| [elementName isEqualToString:kName_ReleaseDate]) {
[currentString setString:@""];
storingCharacters = YES;
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:kName_Item]) {
[self finishedCurrentTopic];
} else if ([elementName isEqualToString:kName_Title]) {
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"[^(]+"
options:NSRegularExpressionCaseInsensitive
error:nil];
NSArray *results = [regex matchesInString:currentString options:0 range:NSMakeRange(0, [currentString length])];
if ([results count] > 0) {
NSString *title = [currentString substringWithRange:[[results objectAtIndex:0] range]];
currentTopic.title = title;
}
NSRegularExpression* regex2 = [NSRegularExpression regularExpressionWithPattern:@"(?<=\\()\\d+"
options:NSRegularExpressionCaseInsensitive
error:nil];
NSArray *results2 = [regex2 matchesInString:currentString options:0 range:NSMakeRange(0, [currentString length])];
if ([results2 count] > 0) {
NSString *count = [currentString substringWithRange:[[results2 objectAtIndex:0] range]];
currentTopic.picCount = [NSNumber numberWithInt:[count intValue]];
//NSLog(@"%@", count);
}
else
currentTopic.picCount = [NSNumber numberWithInt:1];
//currentTopic.title = currentString;
} else if ([elementName isEqualToString:kName_Category]) {
currentTopic.category = currentString;
} else if ([elementName isEqualToString:kName_Guid]) {
currentTopic.guid = currentString;
} else if ([elementName isEqualToString:kName_Creator]) {
currentTopic.creator = currentString;
} else if ([elementName isEqualToString:kName_Description]) {
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"http\\S+(jpg|png|gif|jpeg)"
options:NSRegularExpressionCaseInsensitive
error:nil];
NSArray *results = [regex matchesInString:currentString options:0 range:NSMakeRange(0, [currentString length])];
// for (NSTextCheckingResult *res in results) {
// NSLog(@"regexed: %@", [currentString substringWithRange:res.range]);
// }
if ([results count] > 0) {
NSString *url = [currentString substringWithRange:[[results objectAtIndex:0] range]];
//NSLog(@"%@", url);
currentTopic.iconUrl = url;
}
currentTopic.description = currentString;
} else if ([elementName isEqualToString:kName_ReleaseDate]) {
currentTopic.releaseDate = [parseFormatter dateFromString:currentString];
}
storingCharacters = NO;
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
//NSLog(@"foundCharacters: %@", string); // storing string is when you want the inner text
if (storingCharacters) [currentString appendString:string];
}
/*
A production application should include robust error handling as part of its parsing implementation.
The specifics of how errors are handled depends on the application.
*/
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
NSLog(@"parseError: %@", parseError);
// Handle errors as appropriate for your application.
}
@end
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