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// Copyright (C) 2023 Google LLC
//
// 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 ICING_QUERY_ADVANCED_QUERY_PARSER_FUNCTION_H_
#define ICING_QUERY_ADVANCED_QUERY_PARSER_FUNCTION_H_
#include <functional>
#include <string>
#include <utility>
#include <vector>
#include "icing/text_classifier/lib3/utils/base/statusor.h"
#include "icing/query/advanced_query_parser/param.h"
#include "icing/query/advanced_query_parser/pending-value.h"
namespace icing {
namespace lib {
class Function {
public:
using EvalFunction = std::function<libtextclassifier3::StatusOr<PendingValue>(
std::vector<PendingValue>&&)>;
static libtextclassifier3::StatusOr<Function> Create(
DataType return_type, std::string name, std::vector<Param> params,
EvalFunction eval);
Function(const Function& rhs) = default;
Function(Function&& rhs) = default;
Function& operator=(const Function& rhs) = default;
Function& operator=(Function&& rhs) = default;
const std::string& name() const { return name_; }
libtextclassifier3::StatusOr<PendingValue> Eval(
std::vector<PendingValue>&& args) const;
private:
Function(DataType return_type, std::string name, std::vector<Param> params,
EvalFunction eval)
: name_(std::move(name)),
params_(std::move(params)),
eval_(std::move(eval)),
return_type_(return_type) {}
std::string name_;
std::vector<Param> params_;
EvalFunction eval_;
DataType return_type_;
};
} // namespace lib
} // namespace icing
#endif // ICING_QUERY_ADVANCED_QUERY_PARSER_FUNCTION_H_
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