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Pods/FirebaseFirestoreInternal/Firestore/Source/API/FIRDocumentChange.mm

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+/*
+ * 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 "Firestore/Source/API/FIRDocumentChange+Internal.h"
+
+#import "Firestore/Source/API/FIRDocumentSnapshot+Internal.h"
+
+#include "Firestore/core/src/api/document_change.h"
+#include "Firestore/core/src/util/hard_assert.h"
+
+using firebase::firestore::api::DocumentChange;
+
+NS_ASSUME_NONNULL_BEGIN
+
+namespace {
+
+/**
+ * Converts from C++ document change indexes to Objective-C document change
+ * indexes. Objective-C's NSNotFound is signed NSIntegerMax, not unsigned -1.
+ */
+constexpr NSUInteger MakeIndex(size_t index) {
+  return index == DocumentChange::npos ? NSNotFound : index;
+}
+
+}  // namespace
+
+@implementation FIRDocumentChange {
+  DocumentChange _documentChange;
+}
+
+- (instancetype)initWithDocumentChange:(DocumentChange &&)documentChange {
+  if (self = [super init]) {
+    _documentChange = std::move(documentChange);
+  }
+  return self;
+}
+
+- (BOOL)isEqual:(nullable id)other {
+  if (other == self) return YES;
+  if (![other isKindOfClass:[FIRDocumentChange class]]) return NO;
+
+  FIRDocumentChange *change = (FIRDocumentChange *)other;
+  return _documentChange == change->_documentChange;
+}
+
+- (NSUInteger)hash {
+  return _documentChange.Hash();
+}
+
+- (FIRDocumentChangeType)type {
+  switch (_documentChange.type()) {
+    case DocumentChange::Type::Added:
+      return FIRDocumentChangeTypeAdded;
+    case DocumentChange::Type::Modified:
+      return FIRDocumentChangeTypeModified;
+    case DocumentChange::Type::Removed:
+      return FIRDocumentChangeTypeRemoved;
+  }
+
+  HARD_FAIL("Unknown DocumentChange::Type: %s", _documentChange.type());
+}
+
+- (FIRQueryDocumentSnapshot *)document {
+  return [[FIRQueryDocumentSnapshot alloc] initWithSnapshot:_documentChange.document()];
+}
+
+- (NSUInteger)oldIndex {
+  return MakeIndex(_documentChange.old_index());
+}
+
+- (NSUInteger)newIndex {
+  return MakeIndex(_documentChange.new_index());
+}
+
+@end
+
+NS_ASSUME_NONNULL_END