// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

#pragma once

#include <string>
#include <vector>

#include "gandiva/arrow.h"
#include "gandiva/visibility.h"

namespace gandiva {

/// \brief Signature for a function : includes the base name, input param types and
/// output types.
class GANDIVA_EXPORT FunctionSignature {
 public:
  FunctionSignature(std::string base_name, DataTypeVector param_types,
                    DataTypePtr ret_type);

  bool operator==(const FunctionSignature& other) const;

  /// calculated based on name, datatype id of parameters and datatype id
  /// of return type.
  std::size_t Hash() const;

  DataTypePtr ret_type() const { return ret_type_; }

  const std::string& base_name() const { return base_name_; }

  DataTypeVector param_types() const { return param_types_; }

  std::string ToString() const;

 private:
  std::string base_name_;
  DataTypeVector param_types_;
  DataTypePtr ret_type_;
};

}  // namespace gandiva