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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#pragma once
#include "rocksdb/merge_operator.h"
#include <stdio.h>
#include <memory>
#include <string>
namespace rocksdb {
class MergeOperators {
public:
static std::shared_ptr<MergeOperator> CreatePutOperator();
static std::shared_ptr<MergeOperator> CreateDeprecatedPutOperator();
static std::shared_ptr<MergeOperator> CreateUInt64AddOperator();
static std::shared_ptr<MergeOperator> CreateStringAppendOperator();
static std::shared_ptr<MergeOperator> CreateStringAppendOperator(char delim_char);
static std::shared_ptr<MergeOperator> CreateStringAppendTESTOperator();
static std::shared_ptr<MergeOperator> CreateMaxOperator();
static std::shared_ptr<MergeOperator> CreateBytesXOROperator();
// Will return a different merge operator depending on the string.
// TODO: Hook the "name" up to the actual Name() of the MergeOperators?
static std::shared_ptr<MergeOperator> CreateFromStringId(
const std::string& name) {
if (name == "put") {
return CreatePutOperator();
} else if (name == "put_v1") {
return CreateDeprecatedPutOperator();
} else if ( name == "uint64add") {
return CreateUInt64AddOperator();
} else if (name == "stringappend") {
return CreateStringAppendOperator();
} else if (name == "stringappendtest") {
return CreateStringAppendTESTOperator();
} else if (name == "max") {
return CreateMaxOperator();
} else if (name == "bytesxor") {
return CreateBytesXOROperator();
} else {
// Empty or unknown, just return nullptr
return nullptr;
}
}
};
} // namespace rocksdb
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