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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.
*/
// TODO(rsgowman): This file isn't intended to be used just yet. It's just an
// outline of what the API might eventually look like. Most of this was
// shamelessly stolen and modified from rtdb's header file, melded with the
// (java) firestore api.
#ifndef FIRESTORE_CORE_INCLUDE_FIREBASE_FIRESTORE_EVENT_LISTENER_H_
#define FIRESTORE_CORE_INCLUDE_FIREBASE_FIRESTORE_EVENT_LISTENER_H_
#include "firebase/firestore/firestore_errors.h"
namespace firebase {
namespace firestore {
/**
* @brief An interface for event listeners.
*/
template <typename T>
class EventListener {
public:
virtual ~EventListener() {
}
/**
* @brief OnEvent will be called with the new value or the error if an error
* occurred.
*
* It's guaranteed that exactly one of value or error will be non-null.
*
* @param value The value of the event. null if there was an error.
* @param error The error if there was error. null otherwise.
*/
virtual void OnEvent(const T* value, const Error* error) = 0;
};
} // namespace firestore
} // namespace firebase
#endif // FIRESTORE_CORE_INCLUDE_FIREBASE_FIRESTORE_EVENT_LISTENER_H_
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