mirror of
https://github.com/JohnEstropia/CoreStore.git
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100 lines
4.6 KiB
Swift
100 lines
4.6 KiB
Swift
//
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// CoreStoreObject+Convenience.swift
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// CoreStore
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//
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// Copyright © 2018 John Rommel Estropia
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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import Foundation
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import CoreData
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// MARK: - CoreStoreObject
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extension CoreStoreObject {
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/**
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Exposes a `FetchableSource` that can fetch sibling objects of this `CoreStoreObject` instance. This may be the `DataStack`, a `BaseDataTransaction`, the `NSManagedObjectContext` itself, or `nil` if the obejct's parent is already deallocated.
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- Warning: Future implementations may change the instance returned by this method depending on the timing or condition that `fetchSource()` was called. Do not make assumptions that the instance will be a specific instance. If the `NSManagedObjectContext` instance is desired, use the `FetchableSource.unsafeContext()` method to get the correct instance. Also, do not assume that the `fetchSource()` and `querySource()` return the same instance all the time.
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- returns: a `FetchableSource` that can fetch sibling objects of this `CoreStoreObject` instance. This may be the `DataStack`, a `BaseDataTransaction`, the `NSManagedObjectContext` itself, or `nil` if the object's parent is already deallocated.
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*/
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@nonobjc
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public func fetchSource() -> FetchableSource? {
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guard let context = self.rawObject!.managedObjectContext else {
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return nil
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}
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if context.isTransactionContext {
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return context.parentTransaction
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}
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if context.isDataStackContext {
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return context.parentStack
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}
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return context
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}
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/**
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Exposes a `QueryableSource` that can query attributes and aggregate values. This may be the `DataStack`, a `BaseDataTransaction`, the `NSManagedObjectContext` itself, or `nil` if the obejct's parent is already deallocated.
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- Warning: Future implementations may change the instance returned by this method depending on the timing or condition that `querySource()` was called. Do not make assumptions that the instance will be a specific instance. If the `NSManagedObjectContext` instance is desired, use the `QueryableSource.unsafeContext()` method to get the correct instance. Also, do not assume that the `fetchSource()` and `querySource()` return the same instance all the time.
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- returns: a `QueryableSource` that can query attributes and aggregate values. This may be the `DataStack`, a `BaseDataTransaction`, the `NSManagedObjectContext` itself, or `nil` if the object's parent is already deallocated.
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*/
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@nonobjc
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public func querySource() -> QueryableSource? {
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guard let context = self.rawObject!.managedObjectContext else {
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return nil
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}
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if context.isTransactionContext {
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return context.parentTransaction
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}
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if context.isDataStackContext {
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return context.parentStack
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}
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return context
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}
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/**
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Re-faults the object to use the latest values from the persistent store
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*/
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@nonobjc
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public func refreshAsFault() {
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let rawObject = self.rawObject!
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rawObject.managedObjectContext?.refresh(rawObject, mergeChanges: false)
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}
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/**
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Re-faults the object to use the latest values from the persistent store and merges previously pending changes back
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*/
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@nonobjc
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public func refreshAndMerge() {
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let rawObject = self.rawObject!
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rawObject.managedObjectContext?.refresh(rawObject, mergeChanges: true)
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}
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}
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