XMPPCoreDataStorage autoRemovePreviousDatabaseFile API

Author: ObjColumnist

Extensions/CoreDataStorage/XMPPCoreDataStorage.h

@@ -56,7 +56,8 @@
 	NSUInteger saveThreshold;
 	NSUInteger saveCount;
 
-	BOOL autoRecreateDatabaseFile;
+    BOOL autoRemovePreviousDatabaseFile;
+    BOOL autoRecreateDatabaseFile;
     BOOL autoAllowExternalBinaryDataStorage;
 
 	dispatch_queue_t storageQueue;
@@ -136,6 +137,14 @@
 **/
 @property (strong, readonly) NSManagedObjectContext *mainThreadManagedObjectContext;
 
+/**
+ * The Previous Database File is removed before creating a persistant store.
+ *
+ * Default NO
+**/
+
+@property (readwrite) BOOL autoRemovePreviousDatabaseFile;
+
 /**
  * The Database File is automatically recreated if the persistant store cannot read it e.g. the model changed or the file became corrupt.
  * For greater control overide didNotAddPersistentStoreWithPath:

Extensions/CoreDataStorage/XMPPCoreDataStorage.m

@@ -576,6 +576,14 @@ - (NSPersistentStoreCoordinator *)persistentStoreCoordinator
 			if (storePath)
 			{
 				// If storePath is nil, then NSURL will throw an exception
+                
+                if(autoRemovePreviousDatabaseFile)
+                {
+                    if ([[NSFileManager defaultManager] fileExistsAtPath:storePath])
+                    {
+                        [[NSFileManager defaultManager] removeItemAtPath:storePath error:nil];
+                    }
+                }
 
 				[self willCreatePersistentStoreWithPath:storePath options:storeOptions];
 
@@ -743,6 +751,34 @@ - (void)managedObjectContextDidSave:(NSNotification *)notification
     }
 }
 
+- (BOOL)autoRemovePreviousDatabaseFile
+{
+	__block BOOL result = NO;
+	
+	dispatch_block_t block = ^{ @autoreleasepool {
+		result = autoRemovePreviousDatabaseFile;
+	}};
+	
+	if (dispatch_get_specific(storageQueueTag))
+		block();
+	else
+		dispatch_sync(storageQueue, block);
+	
+	return result;
+}
+
+- (void)setAutoRemovePreviousDatabaseFile:(BOOL)flag
+{
+	dispatch_block_t block = ^{
+		autoRemovePreviousDatabaseFile = flag;
+	};
+	
+	if (dispatch_get_specific(storageQueueTag))
+		block();
+	else
+		dispatch_sync(storageQueue, block);
+}
+
 - (BOOL)autoRecreateDatabaseFile
 {
 	__block BOOL result = NO;
@@ -842,7 +878,6 @@ - (void)maybeSave:(int32_t)currentPendingRequests
 {
 	NSAssert(dispatch_get_specific(storageQueueTag), @"Invoked on incorrect queue");
 
-	
 	if ([[self managedObjectContext] hasChanges])
 	{
 		if (currentPendingRequests == 0)