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RKConnectionDescription.m
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RKConnectionDescription.m
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//
// RKConnectionDescription.m
// RestKit
//
// Created by Blake Watters on 11/20/12.
// Copyright (c) 2012 RestKit. All rights reserved.
//
// 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 "RKConnectionDescription.h"
static NSSet *RKSetWithInvalidAttributesForEntity(NSArray *attributes, NSEntityDescription *entity)
{
NSMutableSet *attributesSet = [NSMutableSet setWithArray:attributes];
NSSet *validAttributeNames = [NSSet setWithArray:[[entity attributesByName] allKeys]];
[attributesSet minusSet:validAttributeNames];
return attributesSet;
}
// Provides support for connecting a relationship by
@interface RKForeignKeyConnectionDescription : RKConnectionDescription
@end
// Provides support for connecting a relationship by traversing the object graph
@interface RKKeyPathConnectionDescription : RKConnectionDescription
@end
@interface RKConnectionDescription ()
@property (nonatomic, strong, readwrite) NSRelationshipDescription *relationship;
@property (nonatomic, copy, readwrite) NSDictionary *attributes;
@property (nonatomic, copy, readwrite) NSString *keyPath;
@end
@implementation RKConnectionDescription
- (id)initWithRelationship:(NSRelationshipDescription *)relationship attributes:(NSDictionary *)attributes
{
NSParameterAssert(relationship);
NSParameterAssert(attributes);
NSAssert([attributes count], @"Cannot connect a relationship without at least one pair of attributes describing the connection");
NSSet *invalidSourceAttributes = RKSetWithInvalidAttributesForEntity([attributes allKeys], [relationship entity]);
NSAssert([invalidSourceAttributes count] == 0, @"Cannot connect relationship: invalid attributes given for source entity '%@': %@", [[relationship entity] name], [[invalidSourceAttributes allObjects] componentsJoinedByString:@", "]);
NSSet *invalidDestinationAttributes = RKSetWithInvalidAttributesForEntity([attributes allValues], [relationship destinationEntity]);
NSAssert([invalidDestinationAttributes count] == 0, @"Cannot connect relationship: invalid attributes given for destination entity '%@': %@", [[relationship destinationEntity] name], [[invalidDestinationAttributes allObjects] componentsJoinedByString:@", "]);
self = [[RKForeignKeyConnectionDescription alloc] init];
if (self) {
self.relationship = relationship;
self.attributes = attributes;
}
return self;
}
- (id)initWithRelationship:(NSRelationshipDescription *)relationship keyPath:(NSString *)keyPath
{
NSParameterAssert(relationship);
NSParameterAssert(keyPath);
self = [[RKKeyPathConnectionDescription alloc] init];
if (self) {
self.relationship = relationship;
self.keyPath = keyPath;
}
return self;
}
- (id)init
{
if ([self class] == [RKConnectionDescription class]) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:[NSString stringWithFormat:@"%@ Failed to call designated initializer. "
"Invoke initWithRelationship:sourceKeyPath:destinationKeyPath:matcher: instead.",
NSStringFromClass([self class])]
userInfo:nil];
}
return [super init];
}
- (id)copyWithZone:(NSZone *)zone
{
if ([self isForeignKeyConnection]) {
return [[[self class] allocWithZone:zone] initWithRelationship:self.relationship attributes:self.attributes];
} else if ([self isKeyPathConnection]) {
return [[[self class] allocWithZone:zone] initWithRelationship:self.relationship keyPath:self.keyPath];
}
return nil;
}
- (BOOL)isForeignKeyConnection
{
return NO;
}
- (BOOL)isKeyPathConnection
{
return NO;
}
@end
@implementation RKForeignKeyConnectionDescription
- (BOOL)isForeignKeyConnection
{
return YES;
}
- (NSString *)description
{
return [NSString stringWithFormat:@"<%@:%p connecting Relationship '%@' from Entity '%@' to Destination Entity '%@' with attributes=%@>",
NSStringFromClass([self class]), self, [self.relationship name], [[self.relationship entity] name],
[[self.relationship destinationEntity] name], self.attributes];
}
@end
@implementation RKKeyPathConnectionDescription
- (BOOL)isKeyPathConnection
{
return YES;
}
- (NSString *)description
{
return [NSString stringWithFormat:@"<%@:%p connecting Relationship '%@' of Entity '%@' with keyPath=%@>",
NSStringFromClass([self class]), self, [self.relationship name], [[self.relationship entity] name], self.keyPath];
}
@end