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NSAtomicStoreCacheNode Class Reference

Overview

NSAtomicStoreCacheNode is a concrete class to represent basic "nodes” in a Core Data atomic store.

A node represents a single record in a persistent store.

You can subclass NSAtomicStoreCacheNode to provide custom behavior.

Tasks

Designated Initializer

• – initWithObjectID:

Node Data

• – objectID
• – propertyCache
• – setPropertyCache:
• – valueForKey:
• – setValue:forKey:

Instance Methods

initWithObjectID:

Returns a cache node for the given managed object ID.

- (id)initWithObjectID:(NSManagedObjectID *)moid

Parameters

moid

A managed object ID.

Return Value

A cache node for the given managed object ID, or nil if the node could not be initialized.

Availability

• Available in Mac OS X v10.5 and later.

Declared In

NSAtomicStoreCacheNode.h

objectID

Returns the managed object ID for the receiver.

- (NSManagedObjectID*)objectID

Return Value

The managed object ID for the receiver.

Availability

• Available in Mac OS X v10.5 and later.

Declared In

NSAtomicStoreCacheNode.h

propertyCache

Returns the property cache dictionary for the receiver.

- (NSMutableDictionary *)propertyCache

Return Value

The property cache dictionary for the receiver.

Discussion

This dictionary is used by -valueForKey: and -setValue:forKey: for property values. The default implementation returns nil unless the companion -setPropertyCache: method is invoked, or -setValue:forKey: is invoked on the cache node with non-nil property values.

Availability

• Available in Mac OS X v10.5 and later.

Declared In

NSAtomicStoreCacheNode.h

setPropertyCache:

Sets the property cache dictionary for the receiver.

- (void)setPropertyCache:(NSMutableDictionary *)propertyCache

Parameters

propertyCache

The property cache dictionary for the receiver.

Availability

• Available in Mac OS X v10.5 and later.

Declared In

NSAtomicStoreCacheNode.h

setValue:forKey:

Sets the value for the given key.

- (void)setValue:(id)value forKey:(NSString *)key

Parameters

value

The value for the property identified by key.

key

The name of a property.

Discussion

The default implementation forwards the request to the propertyCache dictionary if key matches a property name of the entity for this cache node. If key does not represent a property, the standard setValue:forKey: implementation is used.

Availability

• Available in Mac OS X v10.5 and later.

Declared In

NSAtomicStoreCacheNode.h

valueForKey:

Returns the value for a given key.

- (id)valueForKey:(NSString *)key

Parameters

key

The name of a property.

Return Value

The value for the property named key. For an attribute, the return value is an instance of an attribute type supported by Core Data (see NSAttributeDescription); for a to-one relationship, the return value must be another cache node instance; for a to-many relationship, the return value must be an collection of the related cache nodes.

Discussion

The default implementation forwards the request to the propertyCache dictionary if key matches a property name of the entity for the cache node. If key does not represent a property, the standard valueForKey: implementation is used.

Availability

• Available in Mac OS X v10.5 and later.

Declared In

NSAtomicStoreCacheNode.h

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