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// Copyright 2015 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_SYNC_MODEL_MUTABLE_DATA_BATCH_H_
#define COMPONENTS_SYNC_MODEL_MUTABLE_DATA_BATCH_H_
#include <stddef.h>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "components/sync/model/data_batch.h"
namespace syncer {
// An implementation of DataBatch that's purpose is to transfer ownership of
// EntityData objects. As soon as this batch recieves the EntityData, it owns
// them until Next() is invoked, when it gives up ownership. Because a vector
// is used internally, this impl is unaware when duplcate storage_keys are used,
// and it is the caller's job to avoid this.
class MutableDataBatch : public DataBatch {
public:
MutableDataBatch();
MutableDataBatch(const MutableDataBatch&) = delete;
MutableDataBatch& operator=(const MutableDataBatch&) = delete;
~MutableDataBatch() override;
// Takes ownership of the data tied to a given key used for storage. Put
// should be called at most once for any given storage_key. Data will be
// readable in the same order that they are put into the batch.
void Put(const std::string& storage_key,
std::unique_ptr<EntityData> entity_data);
// DataBatch implementation.
bool HasNext() const override;
KeyAndData Next() override;
private:
std::vector<KeyAndData> key_data_pairs_;
size_t read_index_ = 0;
};
} // namespace syncer
#endif // COMPONENTS_SYNC_MODEL_MUTABLE_DATA_BATCH_H_
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