Add KeyFieldFilter

Author: wilhuff

Firestore/core/src/firebase/firestore/core/CMakeLists.txt

@@ -25,6 +25,8 @@ cc_library(
     field_filter.h
     filter.cc
     filter.h
+    key_field_filter.cc
+    key_field_filter.h
     listen_options.h
     nan_filter.cc
     nan_filter.h

Firestore/core/src/firebase/firestore/core/key_field_filter.cc

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2019 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.
+ */
+
+#include "Firestore/core/src/firebase/firestore/core/key_field_filter.h"
+
+#include <utility>
+
+#include "Firestore/core/src/firebase/firestore/model/document_key.h"
+#include "absl/algorithm/container.h"
+
+namespace firebase {
+namespace firestore {
+namespace core {
+
+using model::Document;
+using model::DocumentKey;
+using model::FieldPath;
+using model::FieldValue;
+
+using Operator = Filter::Operator;
+
+KeyFieldFilter::KeyFieldFilter(FieldPath field, Operator op, FieldValue value)
+    : FieldFilter(std::move(field), op, std::move(value)) {
+}
+
+bool KeyFieldFilter::Matches(const Document& doc) const {
+  const DocumentKey& lhs_key = doc.key();
+  const DocumentKey& rhs_key = value().reference_value().key();
+
+  return MatchesComparison(lhs_key.CompareTo(rhs_key));
+}
+
+}  // namespace core
+}  // namespace firestore
+}  // namespace firebase

Firestore/core/src/firebase/firestore/core/key_field_filter.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2019 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.
+ */
+
+#ifndef FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_CORE_KEY_FIELD_FILTER_H_
+#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_CORE_KEY_FIELD_FILTER_H_
+
+#include <string>
+
+#include "Firestore/core/src/firebase/firestore/core/field_filter.h"
+
+namespace firebase {
+namespace firestore {
+namespace core {
+
+/**
+ * A Filter that matches on key fields (i.e. '__name__').
+ */
+class KeyFieldFilter : public FieldFilter {
+ public:
+  KeyFieldFilter() = default;
+
+  KeyFieldFilter(model::FieldPath field,
+                 core::Filter::Operator op,
+                 model::FieldValue value);
+
+  bool Matches(const model::Document& doc) const override;
+};
+
+}  // namespace core
+}  // namespace firestore
+}  // namespace firebase
+
+#endif  // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_CORE_KEY_FIELD_FILTER_H_