WIP: error handling

Sources/Setup/StorageInterfaces/InMemoryStore.swift

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+//
+//  InMemoryStore.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 CoreData
+
+
+// MARK: - InMemoryStore
+
+/**
+ A storage interface that is backed only by memory.
+ */
+public final class InMemoryStore: StorageInterface, DefaultInitializableStore {
+    
+    /**
+     Initializes an `InMemoryStore` for the specified configuration
+     
+     - parameter configuration: an optional configuration name from the model file. If not specified, defaults to `nil`, the "Default" configuration.
+     */
+    public init(configuration: String?) {
+    
+        self.configuration = configuration
+    }
+    
+    
+    // MARK: DefaultInitializableStore
+    
+    /**
+     Initializes an `InMemoryStore` with the "Default" configuration
+     */
+    public init() {
+        
+        self.configuration = nil
+    }
+    
+    
+    // MARK: StorageInterface
+    
+    /**
+     The string identifier for the `NSPersistentStore`'s `type` property. For `InMemoryStore`s, this is always set to `NSInMemoryStoreType`.
+     */
+    public static let storeType = NSInMemoryStoreType
+    
+    /**
+     The configuration name in the model file
+     */
+    public let configuration: String?
+    
+    /**
+     The options dictionary for the `NSPersistentStore`. For `InMemoryStore`s, this is always set to `nil`.
+     */
+    public let storeOptions: [String: AnyObject]? = nil
+}

Sources/Setup/StorageInterfaces/LegacySQLiteStore.swift

@@ -0,0 +1,169 @@
+//
+//  LegacySQLiteStore.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
+
+
+// MARK: - LegacySQLiteStore
+
+/**
+ A storage interface backed by an SQLite database that was created before CoreStore 2.0.0.
+ - Warning: The default SQLite file location for the `LegacySQLiteStore` and `SQLiteStore` are different. If the app was depending on CoreStore's default directories prior to 2.0.0, make sure to use `LegacySQLiteStore` instead of `SQLiteStore`.
+ */
+public final class LegacySQLiteStore: LocalStorage, DefaultInitializableStore {
+    
+    /**
+     Initializes an SQLite store interface from the given SQLite file URL. When this instance is passed to the `DataStack`'s `addStorage()` methods, a new SQLite file will be created if it does not exist.
+     
+     - parameter fileURL: the local file URL for the target SQLite persistent store. Note that if you have multiple configurations, you will need to specify a different `fileURL` explicitly for each of them.
+     - parameter configuration: an optional configuration name from the model file. If not specified, defaults to `nil`, the "Default" configuration. Note that if you have multiple configurations, you will need to specify a different `fileURL` explicitly for each of them.
+     - parameter mappingModelBundles: a list of `NSBundle`s from which to search mapping models for migration.
+     - parameter localStorageOptions: When the `SQLiteStore` is passed to the `DataStack`'s `addStorage()` methods, tells the `DataStack` how to setup the persistent store. Defaults to `.None`.
+     */
+    public init(fileURL: NSURL, configuration: String? = nil, mappingModelBundles: [NSBundle] = NSBundle.allBundles(), localStorageOptions: LocalStorageOptions = nil) {
+        
+        self.fileURL = fileURL
+        self.configuration = configuration
+        self.mappingModelBundles = mappingModelBundles
+        self.localStorageOptions = localStorageOptions
+    }
+    
+    /**
+     Initializes an SQLite store interface from the given SQLite file name. When this instance is passed to the `DataStack`'s `addStorage()` methods, a new SQLite file will be created if it does not exist.
+     - Warning: The default SQLite file location for the `LegacySQLiteStore` and `SQLiteStore` are different. If the app was depending on CoreStore's default directories prior to 2.0.0, make sure to use `LegacySQLiteStore` instead of `SQLiteStore`.
+     
+     - parameter fileName: the local filename for the SQLite persistent store in the "Application Support" directory (or the "Caches" directory on tvOS). Note that if you have multiple configurations, you will need to specify a different `fileName` explicitly for each of them.
+     - parameter configuration: an optional configuration name from the model file. If not specified, defaults to `nil`, the "Default" configuration. Note that if you have multiple configurations, you will need to specify a different `fileName` explicitly for each of them.
+     - parameter mappingModelBundles: a list of `NSBundle`s from which to search mapping models for migration.
+     - parameter localStorageOptions: When the `SQLiteStore` is passed to the `DataStack`'s `addStorage()` methods, tells the `DataStack` how to setup the persistent store. Defaults to `.None`.
+     */
+    public init(fileName: String, configuration: String? = nil, mappingModelBundles: [NSBundle] = NSBundle.allBundles(), localStorageOptions: LocalStorageOptions = nil) {
+        
+        self.fileURL = LegacySQLiteStore.defaultRootDirectory.URLByAppendingPathComponent(
+            fileName,
+            isDirectory: false
+        )
+        self.configuration = configuration
+        self.mappingModelBundles = mappingModelBundles
+        self.localStorageOptions = localStorageOptions
+    }
+    
+    
+    // MARK: DefaultInitializableStore
+    
+    /**
+     Initializes an `LegacySQLiteStore` with an all-default settings: a `fileURL` pointing to a "<Application name>.sqlite" file in the "Application Support" directory (or the "Caches" directory on tvOS), a `nil` `configuration` pertaining to the "Default" configuration, a `mappingModelBundles` set to search all `NSBundle`s, and `localStorageOptions` set to `.AllowProgresiveMigration`.
+     - Warning: The default SQLite file location for the `LegacySQLiteStore` and `SQLiteStore` are different. If the app was depending on CoreStore's default directories prior to 2.0.0, make sure to use `LegacySQLiteStore` instead of `SQLiteStore`.
+     */
+    public init() {
+        
+        self.fileURL = LegacySQLiteStore.defaultFileURL
+        self.configuration = nil
+        self.mappingModelBundles = NSBundle.allBundles()
+        self.localStorageOptions = nil
+    }
+    
+    
+    // MAKR: LocalStorage
+    
+    /**
+     The `NSURL` that points to the SQLite file
+     */
+    public let fileURL: NSURL
+    
+    /**
+     The `NSBundle`s from which to search mapping models for migrations
+     */
+    public let mappingModelBundles: [NSBundle]
+    
+    /**
+     Options that tell the `DataStack` how to setup the persistent store
+     */
+    public var localStorageOptions: LocalStorageOptions
+    
+    
+    // MARK: StorageInterface
+    
+    /**
+     The string identifier for the `NSPersistentStore`'s `type` property. For `SQLiteStore`s, this is always set to `NSSQLiteStoreType`.
+     */
+    public static let storeType = NSSQLiteStoreType
+    
+    /**
+     The configuration name in the model file
+     */
+    public let configuration: String?
+    
+    /**
+     The options dictionary for the `NSPersistentStore`. For `SQLiteStore`s, this is always set to
+     ```
+     [NSSQLitePragmasOption: ["journal_mode": "WAL"]]
+     ```
+     */
+    public let storeOptions: [String: AnyObject]? = [NSSQLitePragmasOption: ["journal_mode": "WAL"]]
+    
+    /**
+     Called by the `DataStack` to perform actual deletion of the store file from disk. Do not call directly! The `sourceModel` argument is a hint for the existing store's model version. For `SQLiteStore`, this converts the database's WAL journaling mode to DELETE before deleting the file.
+     */
+    public func eraseStorageAndWait(soureModel soureModel: NSManagedObjectModel) throws {
+        
+        // TODO: check if attached to persistent store
+        
+        let fileURL = self.fileURL
+        try autoreleasepool {
+            
+            let journalUpdatingCoordinator = NSPersistentStoreCoordinator(managedObjectModel: soureModel)
+            let store = try journalUpdatingCoordinator.addPersistentStoreWithType(
+                self.dynamicType.storeType,
+                configuration: self.configuration,
+                URL: fileURL,
+                options: [NSSQLitePragmasOption: ["journal_mode": "DELETE"]]
+            )
+            try journalUpdatingCoordinator.removePersistentStore(store)
+            try NSFileManager.defaultManager().removeItemAtURL(fileURL)
+        }
+    }
+    
+    
+    // MARK: Internal
+    
+    internal static let defaultRootDirectory: NSURL = {
+        
+        #if os(tvOS)
+            let systemDirectorySearchPath = NSSearchPathDirectory.CachesDirectory
+        #else
+            let systemDirectorySearchPath = NSSearchPathDirectory.ApplicationSupportDirectory
+        #endif
+        
+        return NSFileManager.defaultManager().URLsForDirectory(
+            systemDirectorySearchPath,
+            inDomains: .UserDomainMask
+            ).first!
+    }()
+    
+    internal static let defaultFileURL = LegacySQLiteStore.defaultRootDirectory
+        .URLByAppendingPathComponent(DataStack.applicationName, isDirectory: false)
+        .URLByAppendingPathExtension("sqlite")
+}

Sources/Setup/StorageInterfaces/SQLiteStore.swift

@@ -0,0 +1,174 @@
+//
+//  SQLiteStore.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 CoreData
+
+
+// MARK: - SQLiteStore
+
+/**
+ A storage interface that is backed by an SQLite database.
+ - Warning: The default SQLite file location for the `LegacySQLiteStore` and `SQLiteStore` are different. If the app was depending on CoreStore's default directories prior to 2.0.0, make sure to use `LegacySQLiteStore` instead of `SQLiteStore`.
+ */
+public final class SQLiteStore: LocalStorage, DefaultInitializableStore {
+    
+    /**
+     Initializes an SQLite store interface from the given SQLite file URL. When this instance is passed to the `DataStack`'s `addStorage()` methods, a new SQLite file will be created if it does not exist.
+     
+     - parameter fileURL: the local file URL for the target SQLite persistent store. Note that if you have multiple configurations, you will need to specify a different `fileURL` explicitly for each of them.
+     - parameter configuration: an optional configuration name from the model file. If not specified, defaults to `nil`, the "Default" configuration. Note that if you have multiple configurations, you will need to specify a different `fileURL` explicitly for each of them.
+     - parameter mappingModelBundles: a list of `NSBundle`s from which to search mapping models for migration.
+     - parameter localStorageOptions: When the `SQLiteStore` is passed to the `DataStack`'s `addStorage()` methods, tells the `DataStack` how to setup the persistent store. Defaults to `.None`.
+     */
+    public init(fileURL: NSURL, configuration: String? = nil, mappingModelBundles: [NSBundle] = NSBundle.allBundles(), localStorageOptions: LocalStorageOptions = nil) {
+        
+        self.fileURL = fileURL
+        self.configuration = configuration
+        self.mappingModelBundles = mappingModelBundles
+        self.localStorageOptions = localStorageOptions
+    }
+    
+    /**
+     Initializes an SQLite store interface from the given SQLite file name. When this instance is passed to the `DataStack`'s `addStorage()` methods, a new SQLite file will be created if it does not exist.
+     - Warning: The default SQLite file location for the `LegacySQLiteStore` and `SQLiteStore` are different. If the app was depending on CoreStore's default directories prior to 2.0.0, make sure to use `LegacySQLiteStore` instead of `SQLiteStore`.
+     
+     - parameter fileName: the local filename for the SQLite persistent store in the "Application Support/<bundle id>" directory (or the "Caches/<bundle id>" directory on tvOS). Note that if you have multiple configurations, you will need to specify a different `fileName` explicitly for each of them.
+     - parameter configuration: an optional configuration name from the model file. If not specified, defaults to `nil`, the "Default" configuration. Note that if you have multiple configurations, you will need to specify a different `fileName` explicitly for each of them.
+     - parameter mappingModelBundles: a list of `NSBundle`s from which to search mapping models for migration
+     - parameter localStorageOptions: When the `SQLiteStore` is passed to the `DataStack`'s `addStorage()` methods, tells the `DataStack` how to setup the persistent store. Defaults to `.None`.
+     */
+    public init(fileName: String, configuration: String? = nil, mappingModelBundles: [NSBundle] = NSBundle.allBundles(), localStorageOptions: LocalStorageOptions = nil) {
+        
+        self.fileURL = SQLiteStore.defaultRootDirectory
+            .URLByAppendingPathComponent(fileName, isDirectory: false)
+        self.configuration = configuration
+        self.mappingModelBundles = mappingModelBundles
+        self.localStorageOptions = localStorageOptions
+    }
+    
+    
+    // MARK: DefaultInitializableStore
+    
+    /**
+     Initializes an `SQLiteStore` with an all-default settings: a `fileURL` pointing to a "<Application name>.sqlite" file in the "Application Support/<bundle id>" directory (or the "Caches/<bundle id>" directory on tvOS), a `nil` `configuration` pertaining to the "Default" configuration, a `mappingModelBundles` set to search all `NSBundle`s, and `localStorageOptions` set to `.AllowProgresiveMigration`.
+     - Warning: The default SQLite file location for the `LegacySQLiteStore` and `SQLiteStore` are different. If the app was depending on CoreStore's default directories prior to 2.0.0, make sure to use `LegacySQLiteStore` instead of `SQLiteStore`.
+     */
+    public init() {
+        
+        self.fileURL = SQLiteStore.defaultFileURL
+        self.configuration = nil
+        self.mappingModelBundles = NSBundle.allBundles()
+        self.localStorageOptions = nil
+    }
+    
+    
+    // MAKR: LocalStorage
+    
+    /**
+     The `NSURL` that points to the SQLite file
+     */
+    public let fileURL: NSURL
+    
+    /**
+     The `NSBundle`s from which to search mapping models for migrations
+     */
+    public let mappingModelBundles: [NSBundle]
+    
+    /**
+     Options that tell the `DataStack` how to setup the persistent store
+     */
+    public var localStorageOptions: LocalStorageOptions
+    
+    
+    // MARK: StorageInterface
+    
+    /**
+     The string identifier for the `NSPersistentStore`'s `type` property. For `SQLiteStore`s, this is always set to `NSSQLiteStoreType`.
+     */
+    public static let storeType = NSSQLiteStoreType
+    
+    /**
+     The configuration name in the model file
+     */
+    public let configuration: String?
+    
+    /**
+     The options dictionary for the `NSPersistentStore`. For `SQLiteStore`s, this is always set to 
+     ```
+     [NSSQLitePragmasOption: ["journal_mode": "WAL"]]
+     ```
+     */
+    public let storeOptions: [String: AnyObject]? = [NSSQLitePragmasOption: ["journal_mode": "WAL"]]
+
+    /**
+     Called by the `DataStack` to perform actual deletion of the store file from disk. Do not call directly! The `sourceModel` argument is a hint for the existing store's model version. For `SQLiteStore`, this converts the database's WAL journaling mode to DELETE before deleting the file.
+     */
+    public func eraseStorageAndWait(soureModel soureModel: NSManagedObjectModel) throws {
+        
+        // TODO: check if attached to persistent store 
+        
+        let fileURL = self.fileURL
+        try autoreleasepool {
+            
+            let journalUpdatingCoordinator = NSPersistentStoreCoordinator(managedObjectModel: soureModel)
+            let store = try journalUpdatingCoordinator.addPersistentStoreWithType(
+                self.dynamicType.storeType,
+                configuration: self.configuration,
+                URL: fileURL,
+                options: [NSSQLitePragmasOption: ["journal_mode": "DELETE"]]
+            )
+            try journalUpdatingCoordinator.removePersistentStore(store)
+            try NSFileManager.defaultManager().removeItemAtURL(fileURL)
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    internal static let defaultRootDirectory: NSURL = {
+        
+        #if os(tvOS)
+            let systemDirectorySearchPath = NSSearchPathDirectory.CachesDirectory
+        #else
+            let systemDirectorySearchPath = NSSearchPathDirectory.ApplicationSupportDirectory
+        #endif
+        
+        let defaultSystemDirectory = NSFileManager
+            .defaultManager()
+            .URLsForDirectory(systemDirectorySearchPath, inDomains: .UserDomainMask).first!
+        
+        return defaultSystemDirectory.URLByAppendingPathComponent(
+            NSBundle.mainBundle().bundleIdentifier ?? "com.CoreStore.DataStack",
+            isDirectory: true
+        )
+    }()
+    
+    internal static let defaultFileURL = SQLiteStore.defaultRootDirectory
+        .URLByAppendingPathComponent(
+            (NSBundle.mainBundle().objectForInfoDictionaryKey("CFBundleName") as? String) ?? "CoreData",
+            isDirectory: false
+        )
+        .URLByAppendingPathExtension("sqlite")
+}

Sources/Setup/StorageInterfaces/StorageInterface.swift

@@ -0,0 +1,156 @@
+//
+//  StorageInterface.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 CoreData
+
+
+// MARK: - StorageInterface
+
+/**
+ The `StorageInterface` represents the data store managed (or to be managed) by the `DataStack`. When added to the `DataStack`, the `StorageInterface` serves as the interface for the `NSPersistentStore`. This may be a database file, an in-memory store, etc.
+ */
+public protocol StorageInterface: class {
+    
+    /**
+     The string identifier for the `NSPersistentStore`'s `type` property. This is the same string CoreStore will use to create the `NSPersistentStore` from the `NSPersistentStoreCoordinator`'s `addPersistentStoreWithType(...)` method.
+     */
+    static var storeType: String { get }
+    
+    /**
+     The configuration name in the model file
+     */
+    var configuration: String? { get }
+    
+    /**
+     The options dictionary for the `NSPersistentStore`
+     */
+    var storeOptions: [String: AnyObject]? { get }
+}
+
+
+// MARK: - DefaultInitializableStore
+
+/**
+ The `DefaultInitializableStore` represents `StorageInterface`s that can be initialized with default values
+ */
+public protocol DefaultInitializableStore: StorageInterface {
+    
+    /**
+     Initializes the `StorageInterface` with the default configurations
+     */
+    init()
+}
+
+
+// MARK: - LocalStorageOptions
+
+/**
+ The `LocalStorageOptions` provides settings that tells the `DataStack` how to setup the persistent store for `LocalStorage` implementers.
+ */
+public struct LocalStorageOptions: OptionSetType, NilLiteralConvertible {
+    
+    /**
+     Tells the `DataStack` that the store should not be migrated or recreated, and should simply fail on model mismatch
+     */
+    public static let None = LocalStorageOptions(rawValue: 0)
+    
+    /**
+     Tells the `DataStack` to delete and recreate the store on model mismatch, otherwise exceptions will be thrown on failure instead
+     */
+    public static let RecreateStoreOnModelMismatch = LocalStorageOptions(rawValue: 1 << 0)
+    
+    /**
+     Tells the `DataStack` to prevent progressive migrations for the store
+     */
+    public static let PreventProgressiveMigration = LocalStorageOptions(rawValue: 1 << 1)
+    
+    /**
+     Tells the `DataStack` to allow lightweight migration for the store when added synchronously
+     */
+    public static let AllowSynchronousLightweightMigration = LocalStorageOptions(rawValue: 1 << 2)
+    
+    
+    // MARK: OptionSetType
+    
+    public init(rawValue: Int) {
+        
+        self.rawValue = rawValue
+    }
+    
+    
+    // MARK: RawRepresentable
+    
+    public let rawValue: Int
+    
+    
+    // MARK: NilLiteralConvertible
+    
+    public init(nilLiteral: ()) {
+        
+        self.rawValue = 0
+    }
+}
+
+
+// MARK: - LocalStorage
+
+/**
+ The `LocalStorage` represents `StorageInterface`s that are backed by local files.
+ */
+public protocol LocalStorage: StorageInterface {
+    
+    /**
+     The `NSURL` that points to the store file
+     */
+    var fileURL: NSURL { get }
+    
+    /**
+     The `NSBundle`s from which to search mapping models for migrations
+     */
+    var mappingModelBundles: [NSBundle] { get }
+    
+    /**
+     Options that tell the `DataStack` how to setup the persistent store
+     */
+    var localStorageOptions: LocalStorageOptions { get }
+    
+    /**
+     Called by the `DataStack` to perform actual deletion of the store file from disk. Do not call directly! The `sourceModel` argument is a hint for the existing store's model version. Implementers can use the `sourceModel` to perform necessary store operations. (SQLite stores for example, can convert WAL journaling mode to DELETE before deleting)
+     */
+    func eraseStorageAndWait(soureModel soureModel: NSManagedObjectModel) throws
+}
+
+
+// MARK: Internal
+
+internal extension LocalStorage {
+    
+    internal func matchesPersistentStore(persistentStore: NSPersistentStore) -> Bool {
+        
+        return persistentStore.type == self.dynamicType.storeType
+            && persistentStore.configurationName == (self.configuration ?? Into.defaultConfigurationName)
+            && persistentStore.URL == self.fileURL
+    }
+}