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NSFetchedResultsDataSource.m
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NSFetchedResultsDataSource.m
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//
// Copyright 2009-2011 Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import "NSFetchedResultsDataSource.h"
#define FETCHED_DEBUG NO
#define MAX_FETCH 50
@implementation NSFetchedResultsDataSource
@synthesize isOutdated = _isOutdated;
@synthesize delegates = _delegates;
@synthesize isLoading = _isLoading;
@synthesize relationshipsToFetch = _relationshipsToFetch;
@synthesize fetchLimit = _fetchLimit;
@synthesize updateTimer = _updateTimer;
@synthesize predicate = _predicate;
@synthesize sectionKey = _sectionKey;
@synthesize sortBy = _sortBy;
@synthesize selectFields = _selectFields;
@synthesize tableView = _tableView;
@synthesize fetchedResultsController = _fetchedResultsController;
@synthesize entity = _entity;
- (id) initWithEntity:(NSEntityDescription *)entity controllerTableView:(UITableView *)controllerTableView{
self = [super init];
if(self){
self.entity = entity;
self.tableView = controllerTableView;
self.sortBy = [NSClassFromString([entity managedObjectClassName]) defaultSort];
self.sectionKey = @"section_key";
_selectFields = [[NSArray alloc] init];
self.fetchLimit = MAX_FETCH;
_isLoading = NO;
_isOutdated = NO;
_tableIsUpdating = NO;
_delegates = [[NSMutableArray alloc] init];
}
return self;
}
- (void) loadLocal:(BOOL)more{
TT_RELEASE_SAFELY(_fetchedResultsController);
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:_entity];
[request setSortDescriptors:$SORT(_sortBy)];
[request setPropertiesToFetch:_selectFields];
[request setPredicate:_predicate];
[request setFetchLimit:_fetchLimit];
[request setFetchBatchSize:25];
if(_relationshipsToFetch)
[request setRelationshipKeyPathsForPrefetching:_relationshipsToFetch];
_fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:[ActiveManager shared].managedObjectContext sectionNameKeyPath:_sectionKey cacheName:nil];
_fetchedResultsController.delegate = self;
NSError *error;
[_fetchedResultsController performFetch:&error];
[request release];
}
- (void) loadRemote{
// Left empty to be overriden
}
- (id<TTModel>) model {
return self;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [[_fetchedResultsController sections] count];
}
- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section {
id <NSFetchedResultsSectionInfo> sectionInfo = [[_fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo numberOfObjects];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
id <NSFetchedResultsSectionInfo> sectionInfo = [[_fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo name];
}
- (id) tableView:(UITableView *)tableView objectForRowAtIndexPath:(NSIndexPath *)indexPath{
id object = nil;
@try {
object = [self cellForObject:[_fetchedResultsController objectAtIndexPath:indexPath]];
}
@catch (NSException * e) {
// Do nothing, return object as nil
}
return object;
}
- (NSIndexPath *) tableView:(UITableView *)tableView indexPathForObject:(id)object{
return [_fetchedResultsController indexPathForObject:object];
}
- (id) cellForObject:(id) object{
return object;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (BOOL)isLoaded {
return _fetchedResultsController.fetchedObjects != nil;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (BOOL)isLoading {
return _isLoading;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (BOOL)isLoadingMore {
return NO;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (BOOL)isOutdated {
return _isOutdated;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)cancel {
}
#pragma mark -
#pragma mark NSFetchedResultsControllerDelegate
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
sectionInsertCount = 0;
if(_tableIsUpdating)
return;
_tableIsUpdating = YES;
if(FETCHED_DEBUG)
NSLog(@"STARTING CHANGES");
if(_delegates != nil)
[_delegates perform:@selector(modelDidBeginUpdates:) withObject:self];
else
[self.tableView beginUpdates];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {
switch(type) {
case NSFetchedResultsChangeInsert:
[_delegates perform:@selector(model:didInsertObject:atIndexPath:)
withObject:self
withObject:nil
withObject:[NSIndexPath indexPathWithIndex:sectionIndex]
];
if(FETCHED_DEBUG)
NSLog(@"Section Insert - %i", sectionIndex);
break;
case NSFetchedResultsChangeDelete:
[_delegates perform:@selector(model:didDeleteObject:atIndexPath:)
withObject:self
withObject:nil
withObject:[NSIndexPath indexPathWithIndex:sectionIndex]
];
if(FETCHED_DEBUG)
NSLog(@"Section Delete - %i", sectionIndex);
break;
}
}
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath {
switch(type) {
case NSFetchedResultsChangeInsert:
[_delegates perform:@selector(model:didInsertObject:atIndexPath:)
withObject:self
withObject:anObject
withObject:newIndexPath
];
if(FETCHED_DEBUG)
NSLog(@"Row Insert - %@ - %@", newIndexPath, anObject);
break;
case NSFetchedResultsChangeDelete:
[_delegates perform:@selector(model:didDeleteObject:atIndexPath:)
withObject:self
withObject:anObject
withObject:newIndexPath
];
if(FETCHED_DEBUG)
NSLog(@"Row Deleted - %@", newIndexPath);
break;
case NSFetchedResultsChangeUpdate:
[_delegates perform:@selector(model:didUpdateObject:atIndexPath:)
withObject:self
withObject:anObject
withObject:newIndexPath
];
if(FETCHED_DEBUG)
NSLog(@"Row Updated - %@ - %@", newIndexPath, anObject);
break;
case NSFetchedResultsChangeMove:
break;
}
}
- (NSIndexPath *) tableView:(UITableView *)tableView willInsertObject:(id)object atIndexPath:(NSIndexPath *)indexPath {
return indexPath;
}
- (NSIndexPath *) tableView:(UITableView *)tableView willRemoveObject:(id)object atIndexPath:(NSIndexPath *)indexPath {
return indexPath;
}
- (NSIndexPath *) tableView:(UITableView *)tableView willUpdateObject:(id)object atIndexPath:(NSIndexPath *)indexPath {
return indexPath;
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
_tableIsUpdating = NO;
if(FETCHED_DEBUG)
NSLog(@"FINISHED CHANGES");
if(_delegates != nil)
[_delegates perform:@selector(modelDidEndUpdates:) withObject:self];
else
[self.tableView endUpdates];
}
- (void) silentDidStartLoad{
dispatch_async(dispatch_get_main_queue(), ^{
[[self delegates] perform:@selector(modelDidStartLoad:) withObject:self];
});
}
- (void) silentDidLoad{
dispatch_async(dispatch_get_main_queue(), ^{
[[self delegates] perform:@selector(modelDidFinishLoad:) withObject:self];
});
}
- (void) didStartLoad{
dispatch_async(dispatch_get_main_queue(), ^{
_isLoading = YES;
[[self delegates] perform:@selector(modelDidStartLoad:) withObject:self];
});
}
- (void) didLoad{
dispatch_async(dispatch_get_main_queue(), ^{
_isLoading = NO;
_isOutdated = NO;
[[self delegates] perform:@selector(modelDidFinishLoad:) withObject:self];
});
}
- (void) didFailWithError:(NSError *)error{
dispatch_async(dispatch_get_main_queue(), ^{
_isLoading = NO;
_isOutdated = NO;
[[self delegates] perform:@selector(model:didFailLoadWithError:) withObject:self withObject:error];
});
}
- (NSDate *) loadedTime{
return nil;
}
- (void) load:(TTURLRequestCachePolicy)cachePolicy more:(BOOL)more{
if(cachePolicy == TTURLRequestCachePolicyNetwork)
[self loadRemote];
else
[self loadLocal:more];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString*)titleForLoading:(BOOL)reloading {
if (reloading) {
return TTLocalizedString(@"Updating...", @"");
} else {
return TTLocalizedString(@"Loading...", @"");
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (UIImage*)imageForEmpty {
return [self imageForError:nil];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString*)titleForEmpty {
return @"No Results Found";
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString*)subtitleForEmpty {
return nil;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (UIImage*)imageForError:(NSError*)error {
return nil;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString*)titleForError:(NSError*)error {
return TTDescriptionForError(error);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString*)subtitleForError:(NSError*)error {
return TTLocalizedString(@"Sorry, there was an error.", @"");
}
- (void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self];
_fetchedResultsController.delegate = nil;
TT_RELEASE_SAFELY(_fetchedResultsController);
TT_RELEASE_SAFELY(_entity);
TT_RELEASE_SAFELY(_tableView);
TT_RELEASE_SAFELY(_sortBy);
TT_RELEASE_SAFELY(_selectFields);
TT_RELEASE_SAFELY(_sectionKey);
TT_RELEASE_SAFELY(_predicate);
TT_RELEASE_SAFELY(_updateTimer);
TT_RELEASE_SAFELY(_relationshipsToFetch);
TT_RELEASE_SAFELY(_delegates);
[super dealloc];
}
@end