Entity.m

/*
 
 File: Entity.m
 
 Abstract: Describes an entity belonging to an EntityModel.
 
 Version: 1.0
 
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 */ 
 
// Encapsulates information about a single entity used in an EntityModel.
// An EntityModel defines the mapping between application Entity objects
// and the data source schema. This class can be used independent of 
// Sync Services.
 
#import "Entity.h"
 
@implementation Entity
 
// Creating an Entity object
 
// Creates and returns a new entity represented by the given dictionary.
+ (id)entityWithDictionary:(NSDictionary *)dict
{
    return [[Entity alloc] initWithDictionary:dict];    
}
 
// Initialization and deallocation
 
- (id)init
{
    self = [super init];
    if (self) {
        _representation = [NSMutableDictionary dictionary];
        [_representation setValue:[NSMutableArray array] forKey:@"attributes"];
        [_representation setValue:[NSMutableArray array]forKey:@"relationships"];       
        [_representation setValue:[NSMutableArray array]forKey:@"identityKeys"];        
    }
    
    return self;
}
 
- (id)initWithDictionary:(NSDictionary *)dict
{
    self = [super init];
    if (self) {
        _representation = [NSMutableDictionary dictionaryWithDictionary:dict];
    }
    return self;
}
 
// Saving and loading support
 
// Returns an NSData representation of the receiver for saving to disk.
- (NSData *)fileRepresentation
{
    return (NSData *)CFPropertyListCreateXMLData(kCFAllocatorDefault, (CFPropertyListRef)_representation);
}
 
// Returns a printable string representation of the receiver.
- (NSString *)description
{
    NSString *myDescription = [NSString stringWithFormat:@"[\n%@ = %@\n]", 
        @"_representation", [_representation description]];
    return myDescription;
}
 
// Adding and removing properties
 
// Adds an attribute to the receiver.
- (void)addAttribute:(id)attribute
{
    [[self attributes] addObject:attribute];
    return;
}
 
// Removes an attribute from the receiver.
- (void)removeAttribute:(id)attribute
{
    [[self attributes] removeObject:attribute];
    return;
}
 
// Adds a relationship to the receiver.
- (void)addRelationship:(id)relationship
{
    [[self relationships] addObject:relationship];
    return;
}
 
// Removes a relationship from the receiver.
- (void)removeRelationship:(id)relationship
{
    [[self relationships] removeObject:relationship];
    return;
}
 
// Getting and setting entity properties
 
// Returns the name of the receiver.
- (NSString *)name
{
    return [_representation valueForKey:@"name"];
}
 
// Sets the name of the receiver to name.
- (void)setName:(NSString *)name
{
    [_representation setValue:name forKey:@"name"];
    return;
}
 
// Returns the class name used to create instances of this entity.
- (NSString *)className
{
    return [_representation valueForKey:@"className"];
}
 
// Sets the class name used to create instances of this entity to className.
- (void)setClassName:(NSString *)className
{
    [_representation setValue:className forKey:@"className"];
    return;
}
 
// Returns a user readable name of the receiver.
- (NSString *)displayName
{
    return [_representation valueForKey:@"displayName"];
}
 
// Sets the user readable name of the receiver to displayName.
- (void)setDisplayName:(NSString *)displayName
{
    [_representation setValue:displayName forKey:@"displayName"];
    return;
}
 
- (NSString *)entityName
{
    return [_representation valueForKey:@"entityName"];
}
 
- (void)setEntityName:(NSString *)entityName
{
    [_representation setValue:entityName forKey:@"entityName"];
    return;
}
 
// Returns an array of the property keys that are used to uniquely identify records of this entity.
- (NSArray *)identityKeys
{
    return [_representation valueForKey:@"identityKeys"];
}
 
// Sets the identity keys for this entity to identityKeys.
- (void)setIdentityKeys:(NSArray *)identityKeys
{
    [_representation setValue:identityKeys forKey:@"identityKeys"];
    return;
}
 
// Returns YES if records of this entity are read only, NO otherwise.
- (BOOL)isReadOnly
{
    return NO; // not supported yet
}
 
- (void)setReadOnly:(BOOL)flag;
{
    return; // not supported yet
}
 
- (NSArray *)propertyKeys
{
    NSArray *array1 = [[self attributes] valueForKey:@"name"];
    NSArray *array2 = [[self relationships] valueForKey:@"name"];
    NSMutableArray *propertyKeys = [NSMutableArray array];
    [propertyKeys addObjectsFromArray:array1];
    [propertyKeys addObjectsFromArray:array2];
    return propertyKeys;
}
 
 
// Getting and setting attribute properties
 
- (id)attributeNamed:(NSString *)name
{
    NSEnumerator *enumerator = [[self attributes] objectEnumerator];
    id anObject;
    
    for (anObject = [enumerator nextObject]; ![[anObject valueForKey:@"name"] isEqual:name];){
        anObject = [enumerator nextObject];
    }
    return anObject;
}
 
- (NSMutableArray *)attributes
{
    return [_representation mutableArrayValueForKey:@"attributes"];
}
 
- (NSArray *)attributeKeys
{
    return [[self attributes] valueForKey:@"name"];
}
 
// Getting and setting relationship properties
 
- (id)relationshipNamed:(NSString *)name
{
    NSEnumerator *enumerator = [[self relationships] objectEnumerator];
    id anObject;
    
    for (anObject = [enumerator nextObject]; ![[anObject valueForKey:@"name"] isEqual:name];){
        anObject = [enumerator nextObject];
    }
    return anObject;
}
 
- (NSMutableArray *)relationships
{
    return [_representation mutableArrayValueForKey:@"relationships"];
}
 
- (NSArray *)relationshipKeys
{
    return [[self relationships] valueForKey:@"name"];
}
 
 
// KVC Compliant Methods
 
- (id)valueForUndefinedKey:(NSString *)key
{
    NSLog(@"value for undefined key=%@", key);
    return nil;
}
 
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
    NSLog(@"set value for undefined key=%@", key);
    return;
}
 
- (void)insertObject:(id)anObject inAttributesAtIndex:(NSUInteger)index 
{
    [[self attributes] insertObject:anObject atIndex:index];
    return; 
}
 
- (void)removeObjectFromAttributesAtIndex:(NSUInteger)index 
{
    [[self attributes] removeObjectAtIndex:index];
    return; 
}
 
- (void)insertObject:(id)anObject inRelationshipsAtIndex:(NSUInteger)index 
{
    [[self relationships] insertObject:anObject atIndex:index];
    return; 
}
 
- (void)removeObjectFromRelationshipsAtIndex:(NSUInteger)index 
{
    [[self relationships] removeObjectAtIndex:index];
    return; 
}
 
@end