ARIncrementalStore+Private.m

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// ActiveResourceKit ARIncrementalStore+Private.m
//
// Copyright © 2012, Roy Ratcliffe, Pioneering Software, United Kingdom
//
// Permission is hereby 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 following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS," WITHOUT WARRANTY OF ANY KIND, EITHER
// EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 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.
//
//------------------------------------------------------------------------------

#import "ARIncrementalStore+Private.h"

#import <ActiveResourceKit/ActiveResourceKit.h>
#import <ActiveSupportKit/ActiveSupportKit.h>

@implementation ARIncrementalStore(Private)

- (NSManagedObjectID *)objectIDForResource:(ARResource *)resource withContext:(NSManagedObjectContext *)context
{
    NSString *entityName = [self entityNameForElementName:[[resource serviceLazily] elementNameLazily]];
    NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:context];
    return [self newObjectIDForEntity:entity referenceObject:[resource ID]];
}

- (NSManagedObjectID *)objectIDForCachedResource:(ARResource *)resource withContext:(NSManagedObjectContext *)context
{
    NSManagedObjectID *objectID = [self objectIDForResource:resource withContext:context];
    [_resourcesByObjectID setObject:resource forKey:objectID];
    return objectID;
}

- (ARResource *)cachedResourceForObjectID:(NSManagedObjectID *)objectID error:(NSError **)outError
{
    ARResource *__block resource = [_resourcesByObjectID objectForKey:objectID];
    if (resource == nil)
    {
        NSNumber *ID = [self referenceObjectForObjectID:objectID];
        ARService *service = [self serviceForEntityName:[[objectID entity] name]];
        [service findSingleWithID:ID options:nil completionHandler:^(ARHTTPResponse *response, ARResource *aResource, NSError *error) {
            if (aResource)
            {
                [_resourcesByObjectID setObject:resource = aResource forKey:objectID];
            }
            else
            {
                if (outError && *outError == nil)
                {
                    *outError = error;
                }
            }
        }];
    }
    return resource;
}

- (uint64_t)versionForResource:(ARResource *)resource
{
    uint64_t version;
    NSDate *updatedAt = ASDateFromRFC3339String(ASNilForNull([[resource attributes] objectForKey:@"updated_at"]));
    if (updatedAt)
    {
        version = [updatedAt timeIntervalSinceReferenceDate] * 1000;
    }
    else
    {
        version = 0;
    }
    return version;
}

- (void)refreshObject:(NSManagedObject *)object
{
    [_resourcesByObjectID removeObjectForKey:[object objectID]];
    [[object managedObjectContext] refreshObject:object mergeChanges:NO];
}

- (NSDictionary *)foreignKeysForObject:(NSManagedObject *)object resource:(ARResource *)resource
{
    NSMutableDictionary *foreignKeys = [NSMutableDictionary dictionary];
    for (NSPropertyDescription *property in [[object entity] properties])
    {
        if ([property isKindOfClass:[NSRelationshipDescription class]] && [(NSRelationshipDescription *)property maxCount] == 1)
        {
            NSString *attributeName = [self attributeNameForPropertyName:[(NSRelationshipDescription *)property name]];
            NSString *foreignKey = [[ASInflector defaultInflector] foreignKey:attributeName separateClassNameAndIDWithUnderscore:YES];
            NSManagedObject *destination = [object valueForKey:[(NSRelationshipDescription *)property name]];
            if (ASNilForNull([[resource attributes] objectForKey:foreignKey]) == nil && destination)
            {
                NSNumber *destinationID = [self referenceObjectForObjectID:[destination objectID]];
                [foreignKeys setObject:destinationID forKey:foreignKey];
            }
        }
    }
    return [foreignKeys copy];
}

@end