instance type checks

MVMCore/MVMCore/ActionHandling/MVMCoreActionHandler.m

@@ -36,6 +36,7 @@ NSString * const KeyActionTypeOpen = @"openPage";
 @implementation MVMCoreActionHandler
 
 + (nullable instancetype)sharedActionHandler {
+    [MVMCoreActionUtility verifyClassIsInstanceTypeOfClass:[MVMCoreObject sharedInstance].actionHandler.class otherClass:self];
     return [MVMCoreObject sharedInstance].actionHandler;
 }
 

MVMCore/MVMCore/OtherHandlers/MVMCoreCache.m

@@ -14,6 +14,7 @@
 #import "MVMCoreGetterUtility.h"
 #import "MVMCoreObject.h"
 #import "MVMCoreConstants.h"
+#import "MVMCoreActionUtility.h"
 
 @interface MVMCoreCache ()
 
@@ -41,6 +42,7 @@
 static NSString * const STATIC_CACHE_COMPONENT = @"StaticCache.txt";
 
 + (nullable instancetype)sharedCache {
+    [MVMCoreActionUtility verifyClassIsInstanceTypeOfClass:[MVMCoreObject sharedInstance].cache.class otherClass:self];
     return [MVMCoreObject sharedInstance].cache;
 }
 

MVMCore/MVMCore/OtherHandlers/MVMCoreLoggingHandler.m

@@ -8,10 +8,12 @@
 
 #import "MVMCoreLoggingHandler.h"
 #import "MVMCoreObject.h"
+#import "MVMCoreActionUtility.h"
 
 @implementation MVMCoreLoggingHandler
 
 + (nullable instancetype)sharedLoggingHandler {
+    [MVMCoreActionUtility verifyClassIsInstanceTypeOfClass:[MVMCoreObject sharedInstance].loggingDelegate.class otherClass:self];
     return [MVMCoreObject sharedInstance].loggingDelegate;
 }
 

MVMCore/MVMCore/Session/MVMCoreSessionObject.m

@@ -8,10 +8,12 @@
 
 #import "MVMCoreSessionObject.h"
 #import "MVMCoreObject.h"
+#import "MVMCoreActionUtility.h"
 
 @implementation MVMCoreSessionObject
 
 + (nullable instancetype)sharedGlobal {
+    [MVMCoreActionUtility verifyClassIsInstanceTypeOfClass:[MVMCoreObject sharedInstance].session.class otherClass:self];
     return [MVMCoreObject sharedInstance].session;
 }
 

MVMCore/MVMCore/Session/MVMCoreSessionTimeHandler.m

@@ -18,6 +18,7 @@
 #import "MVMCoreRequestParameters.h"
 #import "NSDictionary+MFConvenience.h"
 #import "MVMCoreObject.h"
+#import "MVMCoreActionUtility.h"
 
 @interface MVMCoreSessionTimeHandler ()
 
@@ -46,6 +47,7 @@
 @implementation MVMCoreSessionTimeHandler
 
 + (nullable instancetype)sharedSessionHandler {
+    [MVMCoreActionUtility verifyClassIsInstanceTypeOfClass:[MVMCoreObject sharedInstance].sessionHandler.class otherClass:self];
     return [MVMCoreObject sharedInstance].sessionHandler;
 }
 

MVMCore/MVMCore/Utility/Helpers/MVMCoreActionUtility.h

@@ -23,4 +23,7 @@
 // Can call to display a view controller based on the load object in the same way the architecture does it. Will check the presentation style of the page, action, and request. Will check if needs a view manager.
 + (void)displayViewController:(nonnull UIViewController <MVMCoreViewControllerProtocol> *)viewController forLoadObject:(nullable MVMCoreLoadObject *)loadObject presentationDelegate:(nullable NSObject<MVMCorePresentationDelegateProtocol>*)delegate completionHandler:(nullable void (^)(void))completionBlock;
 
+// Throws an error if the class is not the same or a subclass of the other class.
++ (void)verifyClassIsInstanceTypeOfClass:(Class)theClass otherClass:(Class)otherClass;
+
 @end

MVMCore/MVMCore/Utility/Helpers/MVMCoreActionUtility.m

@@ -137,4 +137,10 @@
     [[MVMCoreNavigationHandler sharedNavigationHandler] navigateWithLoadObject:loadObject viewController:(viewControllerToLoad ?: viewController) delegate:delegate completionHandler:completionBlock];
 }
 
++ (void)verifyClassIsInstanceTypeOfClass:(Class)theClass otherClass:(Class)otherClass {
+    if (theClass != otherClass && ![theClass isSubclassOfClass:otherClass]) {
+        @throw([NSException exceptionWithName:@"NotInstanceType" reason:[NSString stringWithFormat:@"%@ is not an instance of %@",theClass,otherClass] userInfo:nil]);
+    }
+}
+
 @end

MVMCore/MVMCore/ViewControllerMapping/MVMCoreViewControllerMappingObject.m

@@ -18,6 +18,7 @@
 #import "MVMCoreErrorConstants.h"
 #import "MVMCoreHardcodedStringsConstants.h"
 #import "MVMCoreObject.h"
+#import "MVMCoreActionUtility.h"
 
 @interface MVMCoreViewControllerMappingObject ()
 
@@ -26,6 +27,7 @@
 @implementation MVMCoreViewControllerMappingObject
 
 + (nullable instancetype)sharedViewControllerMappingObject {
+    [MVMCoreActionUtility verifyClassIsInstanceTypeOfClass:[MVMCoreObject sharedInstance].viewControllerMapping.class otherClass:self];
     return [MVMCoreObject sharedInstance].viewControllerMapping;
 }