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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_FEED_CORE_V2_STREAM_MODEL_EPHEMERAL_CHANGE_H_
#define COMPONENTS_FEED_CORE_V2_STREAM_MODEL_EPHEMERAL_CHANGE_H_
#include <memory>
#include <vector>
#include "components/feed/core/proto/v2/store.pb.h"
#include "components/feed/core/v2/stream_model/feature_tree.h"
#include "components/feed/core/v2/types.h"
namespace feed {
namespace stream_model {
// A sequence of data operations that may be reverted.
class EphemeralChange {
public:
EphemeralChange(EphemeralChangeId id,
std::vector<feedstore::DataOperation> operations);
~EphemeralChange();
EphemeralChange(const EphemeralChange&) = delete;
EphemeralChange& operator=(const EphemeralChange&) = delete;
EphemeralChangeId id() const { return id_; }
const std::vector<feedstore::DataOperation>& GetOperations() const {
return operations_;
}
std::vector<feedstore::DataOperation>& GetOperations() { return operations_; }
private:
EphemeralChangeId id_;
std::vector<feedstore::DataOperation> operations_;
};
// A list of |EphemeralChange| objects.
class EphemeralChangeList {
public:
EphemeralChangeList();
~EphemeralChangeList();
EphemeralChangeList(const EphemeralChangeList&) = delete;
EphemeralChangeList& operator=(const EphemeralChangeList&) = delete;
const std::vector<std::unique_ptr<EphemeralChange>>& GetChangeList() const {
return change_list_;
}
EphemeralChange* Find(EphemeralChangeId id);
EphemeralChange* AddEphemeralChange(
std::vector<feedstore::DataOperation> operations);
std::unique_ptr<EphemeralChange> Remove(EphemeralChangeId id);
private:
EphemeralChangeId::Generator id_generator_;
std::vector<std::unique_ptr<EphemeralChange>> change_list_;
};
// Return a new |FeatureTree| by applying |changes| to |tree|.
std::unique_ptr<FeatureTree> ApplyEphemeralChanges(
const FeatureTree& tree,
const EphemeralChangeList& changes);
} // namespace stream_model
} // namespace feed
#endif // COMPONENTS_FEED_CORE_V2_STREAM_MODEL_EPHEMERAL_CHANGE_H_
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