1 files changed, 61 insertions, 0 deletions
diff --git a/Firebase/Database/Core/View/FViewCache.m b/Firebase/Database/Core/View/FViewCache.m
new file mode 100644
index 0000000..c6ec8b1
--- /dev/null
+++ b/Firebase/Database/Core/View/FViewCache.m
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FViewCache.h"
+#import "FCacheNode.h"
+#import "FNode.h"
+#import "FEmptyNode.h"
+
+@interface FViewCache ()
+@property (nonatomic, strong, readwrite) FCacheNode *cachedEventSnap;
+@property (nonatomic, strong, readwrite) FCacheNode *cachedServerSnap;
+@end
+
+@implementation FViewCache
+
+- (id) initWithEventCache:(FCacheNode *)eventCache serverCache:(FCacheNode *)serverCache {
+    self = [super init];
+    if (self) {
+        self.cachedEventSnap = eventCache;
+        self.cachedServerSnap = serverCache;
+    }
+    return self;
+}
+
+- (FViewCache *) updateEventSnap:(FIndexedNode *)eventSnap isComplete:(BOOL)complete isFiltered:(BOOL)filtered {
+    FCacheNode *updatedEventCache = [[FCacheNode alloc] initWithIndexedNode:eventSnap
+                                                         isFullyInitialized:complete
+                                                                 isFiltered:filtered];
+    return [[FViewCache alloc] initWithEventCache:updatedEventCache serverCache:self.cachedServerSnap];
+}
+
+- (FViewCache *) updateServerSnap:(FIndexedNode *)serverSnap isComplete:(BOOL)complete isFiltered:(BOOL)filtered {
+    FCacheNode *updatedServerCache = [[FCacheNode alloc] initWithIndexedNode:serverSnap
+                                                          isFullyInitialized:complete
+                                                                  isFiltered:filtered];
+    return [[FViewCache alloc] initWithEventCache:self.cachedEventSnap serverCache:updatedServerCache];
+}
+
+- (id<FNode>) completeEventSnap {
+    return (self.cachedEventSnap.isFullyInitialized) ? self.cachedEventSnap.node : nil;
+}
+
+- (id<FNode>) completeServerSnap {
+    return (self.cachedServerSnap.isFullyInitialized) ? self.cachedServerSnap.node : nil;
+}
+
+
+@end