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/*
* Copyright 2018 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_MODEL_TRANSFORM_OPERATIONS_H_
#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_MODEL_TRANSFORM_OPERATIONS_H_
namespace firebase {
namespace firestore {
namespace model {
// TODO(zxu123): We might want to refactor transform_operations.h into several
// files when the number of different types of operations grows gigantically.
// For now, put the interface and the only operation here.
/** Represents a transform within a TransformMutation. */
class TransformOperation {
public:
/** All the different kinds to TransformOperation. */
enum class Type {
ServerTimestamp,
Test, // Purely for test purpose.
};
virtual ~TransformOperation() {
}
/** Returns the actual type. */
virtual Type type() const = 0;
/** Returns whether the two are equal. */
virtual bool operator==(const TransformOperation& other) const = 0;
/** Returns whether the two are not equal. */
bool operator!=(const TransformOperation& other) const {
return !operator==(other);
}
#if defined(__OBJC__)
// For Objective-C++ hash; to be removed after migration.
// Do NOT use in C++ code.
virtual NSUInteger Hash() const = 0;
#endif // defined(__OBJC__)
};
/** Transforms a value into a server-generated timestamp. */
class ServerTimestampTransform : public TransformOperation {
public:
~ServerTimestampTransform() override {
}
Type type() const override {
return Type::ServerTimestamp;
}
bool operator==(const TransformOperation& other) const override {
// All ServerTimestampTransform objects are equal.
return other.type() == Type::ServerTimestamp;
}
static const ServerTimestampTransform& Get() {
static ServerTimestampTransform shared_instance;
return shared_instance;
}
#if defined(__OBJC__)
// For Objective-C++ hash; to be removed after migration.
// Do NOT use in C++ code.
NSUInteger Hash() const override {
// arbitrary number, the same as used in ObjC implementation, since all
// instances are equal.
return 37;
}
#endif // defined(__OBJC__)
private:
ServerTimestampTransform() {
}
};
} // namespace model
} // namespace firestore
} // namespace firebase
#endif // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_MODEL_TRANSFORM_OPERATIONS_H_
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