1 files changed, 113 insertions, 0 deletions
diff --git a/Firestore/Source/API/FIRCollectionReference.m b/Firestore/Source/API/FIRCollectionReference.m
new file mode 100644
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+++ b/Firestore/Source/API/FIRCollectionReference.m
@@ -0,0 +1,113 @@
+/*
+ * 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 "FIRCollectionReference.h"
+
+#import "FIRDocumentReference+Internal.h"
+#import "FIRQuery+Internal.h"
+#import "FIRQuery_Init.h"
+#import "FSTAssert.h"
+#import "FSTDocumentKey.h"
+#import "FSTPath.h"
+#import "FSTQuery.h"
+#import "FSTUsageValidation.h"
+#import "FSTUtil.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FIRCollectionReference ()
+- (instancetype)initWithPath:(FSTResourcePath *)path
+                   firestore:(FIRFirestore *)firestore NS_DESIGNATED_INITIALIZER;
+
+// Mark the super class designated initializer unavailable.
+- (instancetype)initWithQuery:(FSTQuery *)query
+                    firestore:(FIRFirestore *)firestore
+    __attribute__((unavailable("Use the initWithPath constructor of FIRCollectionReference.")));
+@end
+
+@implementation FIRCollectionReference (Internal)
++ (instancetype)referenceWithPath:(FSTResourcePath *)path firestore:(FIRFirestore *)firestore {
+  return [[FIRCollectionReference alloc] initWithPath:path firestore:firestore];
+}
+@end
+
+@implementation FIRCollectionReference
+
+- (instancetype)initWithPath:(FSTResourcePath *)path firestore:(FIRFirestore *)firestore {
+  if (path.length % 2 != 1) {
+    FSTThrowInvalidArgument(
+        @"Invalid collection reference. Collection references must have an odd "
+         "number of segments, but %@ has %d",
+        path.canonicalString, path.length);
+  }
+  self = [super initWithQuery:[FSTQuery queryWithPath:path] firestore:firestore];
+  return self;
+}
+
+// Override the designated initializer from the super class.
+- (instancetype)initWithQuery:(FSTQuery *)query firestore:(FIRFirestore *)firestore {
+  FSTFail(@"Use FIRCollectionReference initWithPath: initializer.");
+}
+
+- (NSString *)collectionID {
+  return [self.query.path lastSegment];
+}
+
+- (FIRDocumentReference *_Nullable)parent {
+  FSTResourcePath *parentPath = [self.query.path pathByRemovingLastSegment];
+  if (parentPath.isEmpty) {
+    return nil;
+  } else {
+    FSTDocumentKey *key = [FSTDocumentKey keyWithPath:parentPath];
+    return [FIRDocumentReference referenceWithKey:key firestore:self.firestore];
+  }
+}
+
+- (NSString *)path {
+  return [self.query.path canonicalString];
+}
+
+- (FIRDocumentReference *)documentWithPath:(NSString *)documentPath {
+  if (!documentPath) {
+    FSTThrowInvalidArgument(@"Document path cannot be nil.");
+  }
+  FSTResourcePath *subPath = [FSTResourcePath pathWithString:documentPath];
+  FSTResourcePath *path = [self.query.path pathByAppendingPath:subPath];
+  return [FIRDocumentReference referenceWithPath:path firestore:self.firestore];
+}
+
+- (FIRDocumentReference *)addDocumentWithData:(NSDictionary<NSString *, id> *)data {
+  return [self addDocumentWithData:data completion:nil];
+}
+
+- (FIRDocumentReference *)addDocumentWithData:(NSDictionary<NSString *, id> *)data
+                                   completion:
+                                       (nullable void (^)(NSError *_Nullable error))completion {
+  FIRDocumentReference *docRef = [self documentWithAutoID];
+  [docRef setData:data completion:completion];
+  return docRef;
+}
+
+- (FIRDocumentReference *)documentWithAutoID {
+  NSString *autoID = [FSTUtil autoID];
+  FSTDocumentKey *key =
+      [FSTDocumentKey keyWithPath:[self.query.path pathByAppendingSegment:autoID]];
+  return [FIRDocumentReference referenceWithKey:key firestore:self.firestore];
+}
+
+@end
+
+NS_ASSUME_NONNULL_END