WIP: objective-C fetching

Sources/ObjectiveC/NSManagedObjectContext+ObjectiveC.swift

@@ -0,0 +1,112 @@
+//
+//  NSManagedObjectContext+ObjectiveC.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  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, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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 Foundation
+import CoreData
+
+
+// MARK: - NSManagedObjectContext
+
+internal extension NSManagedObjectContext {
+
+    // MARK: Internal
+    
+    @nonobjc
+    internal func fetchOne(from: CSFrom, _ fetchClauses: [CSFetchClause]) -> NSManagedObject? {
+        
+        let fetchRequest = NSFetchRequest()
+        from.swift.applyToFetchRequest(fetchRequest, context: self)
+        
+        fetchRequest.fetchLimit = 1
+        fetchRequest.resultType = .ManagedObjectResultType
+        fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
+        
+        return self.fetchOne(fetchRequest)
+    }
+    
+    @nonobjc
+    internal func fetchAll(from: CSFrom, _ fetchClauses: [CSFetchClause]) -> [NSManagedObject]? {
+        
+        let fetchRequest = NSFetchRequest()
+        from.swift.applyToFetchRequest(fetchRequest, context: self)
+        
+        fetchRequest.fetchLimit = 0
+        fetchRequest.resultType = .ManagedObjectResultType
+        fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
+        
+        return self.fetchAll(fetchRequest)
+    }
+    
+    @nonobjc
+    internal func fetchCount(from: CSFrom, _ fetchClauses: [CSFetchClause]) -> Int? {
+        
+        let fetchRequest = NSFetchRequest()
+        from.swift.applyToFetchRequest(fetchRequest, context: self)
+        fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
+        
+        return self.fetchCount(fetchRequest)
+    }
+    
+    @nonobjc
+    internal func fetchObjectID(from: CSFrom, _ fetchClauses: [CSFetchClause]) -> NSManagedObjectID? {
+        
+        let fetchRequest = NSFetchRequest()
+        from.swift.applyToFetchRequest(fetchRequest, context: self)
+        
+        fetchRequest.fetchLimit = 1
+        fetchRequest.resultType = .ManagedObjectIDResultType
+        fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
+        
+        return self.fetchObjectID(fetchRequest)
+    }
+    
+    @nonobjc
+    internal func fetchObjectIDs(from: CSFrom, _ fetchClauses: [CSFetchClause]) -> [NSManagedObjectID]? {
+        
+        let fetchRequest = NSFetchRequest()
+        from.swift.applyToFetchRequest(fetchRequest, context: self)
+        
+        fetchRequest.fetchLimit = 0
+        fetchRequest.resultType = .ManagedObjectIDResultType
+        fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
+        
+        return self.fetchObjectIDs(fetchRequest)
+    }
+    
+    @nonobjc
+    internal func deleteAll(from: CSFrom, _ deleteClauses: [CSDeleteClause]) -> Int? {
+        
+        let fetchRequest = NSFetchRequest()
+        from.swift.applyToFetchRequest(fetchRequest, context: self)
+        
+        fetchRequest.fetchLimit = 0
+        fetchRequest.resultType = .ManagedObjectResultType
+        fetchRequest.returnsObjectsAsFaults = true
+        fetchRequest.includesPropertyValues = false
+        deleteClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
+        
+        return self.deleteAll(fetchRequest)
+    }
+}