CoreStore/HardcoreData/DataStack+Observing.swift

//
//  DataStack+Observing.swift
//  HardcoreData
//
//  Copyright (c) 2015 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
import GCDKit


// MARK: - DataStack

public extension DataStack {
    
    // MARK: Public
    
    public func observeObject<T: NSManagedObject>(object: T) -> ManagedObjectController<T> {
        
        HardcoreData.assert(GCDQueue.Main.isCurrentExecutionContext(), "Attempted to observe objects from \(typeName(self)) outside the main queue.")
        
        return ManagedObjectController(
            dataStack: self,
            object: object
        )
    }
    
    public func observeObjectList<T: NSManagedObject>(from: From<T>, _ groupBy: GroupBy? = nil, _ queryClauses: FetchClause...) -> ManagedObjectListController<T> {
        
        HardcoreData.assert(GCDQueue.Main.isCurrentExecutionContext(), "Attempted to observe objects from \(typeName(self)) outside the main queue.")
        
        // TODO: sectionNameKeyPath and cacheResults
        return ManagedObjectListController(
            dataStack: self,
            entity: T.self,
            sectionNameKeyPath: groupBy?.keyPaths.first,
            cacheResults: false,
            queryClauses: queryClauses
        )
    }
}