gistfile1.diff

diff --git a/Airship/StoreFront/StoreFrontDelegate.h b/Airship/StoreFront/StoreFrontDelegate.h
index 98ceb74..5d6c06a 100644
--- a/Airship/StoreFront/StoreFrontDelegate.h
+++ b/Airship/StoreFront/StoreFrontDelegate.h
@@ -32,5 +32,6 @@
 @optional
 -(void)storeFrontDidHide;
 -(void)storeFrontWillHide;
+-(BOOL)shouldDisplayProduct:(UAProduct*)product;
 
 @end
diff --git a/Airship/StoreFront/UAInventory.m b/Airship/StoreFront/UAInventory.m
index 9088f85..2b60742 100644
--- a/Airship/StoreFront/UAInventory.m
+++ b/Airship/StoreFront/UAInventory.m
@@ -55,13 +55,29 @@
 	return productList;
 }
 
-- (NSArray*)sortedKeys {
-    return [[productList allKeys] sortedArrayUsingSelector:@selector(compare:)];
+- (NSArray*)displayKeys {
+    //get the list
+    NSArray *result = [productList allKeys];
+
+    //then filter it, if necessary
+    if ([[StoreFront shared].delegate respondsToSelector:@selector(shouldDisplayProduct:)]) {
+        NSMutableArray *filteredProducts = [NSMutableArray arrayWithCapacity:result.count];
+        for (NSString *productID in result) {
+            if ([[StoreFront shared].delegate shouldDisplayProduct:[productList objectForKey:productID]])
+                [filteredProducts addObject:productID];
+        }
+        result = filteredProducts;
+    }
+
+    //then sort it
+    result = [result sortedArrayUsingSelector:@selector(compare:)];
+
+    return result;
 }
 
 - (void)removeProduct:(NSString*)productId {
 	[productList removeObjectForKey: productId];
-	[keys setArray: self.sortedKeys];
+	[keys setArray: self.displayKeys];
 }
 
 - (UAProduct*)productWithIdentifier:(NSString*)productId {
@@ -70,7 +86,7 @@
 
 - (void)addProduct:(UAProduct*)product {
 	[productList setObject: product forKey: product.productIdentifier];
-	[keys setArray: self.sortedKeys];
+	[keys setArray: self.displayKeys];
 }
 
 - (int)count {