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/*
* This project constitutes a work of the United States Government and is
* not subject to domestic copyright protection under 17 USC § 105.
*
* However, because the project utilizes code licensed from contributors
* and other third parties, it therefore is licensed under the MIT
* License. http://opensource.org/licenses/mit-license.php. Under that
* license, permission is granted free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the conditions that any appropriate copyright notices and this
* permission notice are included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
//
// WHFeedController.m
// WhiteHouseApp
//
//
#import "WHFeed.h"
#import "WHFeedCache.h"
NSString* const WHFeedChangedNotification = @"WHFeedChangedNotification";
@implementation WHFeed
@synthesize feedURL = _feedURL;
@synthesize items = _items;
@synthesize title;
@synthesize isDatabaseBacked;
@synthesize lastUpdatedDate;
- (id)initWithFeedURL:(NSURL *)feedURL
{
if ((self = [super init])) {
self.feedURL = feedURL;
_queue = dispatch_queue_create("gov.eop.wh.feed_loading", NULL);
}
return self;
}
- (void)notify
{
dispatch_sync(dispatch_get_main_queue(), ^{
[[NSNotificationCenter defaultCenter] postNotificationName:WHFeedChangedNotification object:self userInfo:nil];
});
}
- (void)internalFetch
{
if (self.isDatabaseBacked && self.items == nil) {
NSSet *databaseItems = [[WHFeedCache sharedCache] cachedItemsForURL:self.feedURL];
if ([databaseItems count])
{
self.items = databaseItems;
[self notify];
}
}
NSData *feedData = [NSData dataWithContentsOfURL:self.feedURL];
if (feedData) {
NSMutableDictionary *itemsByGUID = [NSMutableDictionary dictionaryWithCapacity:self.items.count];
for (WHFeedItem *item in self.items) {
[itemsByGUID setObject:item forKey:item.guid];
}
WHFeedParser *parser = [[WHFeedParser alloc] initWithFeedData:feedData];
// parse with block callback
[parser parse: ^(WHFeedItem *item) {
WHFeedItem *existingItem = [itemsByGUID objectForKey:item.guid];
if (![existingItem isEqualToFeedItem:item]) {
item.feedURL = self.feedURL;
if (existingItem) {
// make sure to maintain this when items are replaced
item.isFavorited = existingItem.isFavorited;
}
[[WHFeedCache sharedCache] saveFeedItem:item];
[itemsByGUID setObject:item forKey:item.guid];
}
}];
self.items = [NSSet setWithArray:[itemsByGUID allValues]];
[self notify];
}
}
- (void)fetch
{
self.lastUpdatedDate = [NSDate date];
dispatch_async(_queue, ^{
NINetworkActivityTaskDidStart();
[self internalFetch];
NINetworkActivityTaskDidFinish();
});
}
- (NSSet *)favorites
{
return [[WHFeedCache sharedCache] favoritedItemsForURL:self.feedURL];
}
@end
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