r/src/scalar.cpp

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// 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
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// specific language governing permissions and limitations
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#include "./arrow_types.h"

#if defined(ARROW_R_WITH_ARROW)

#include <arrow/array/array_base.h>
#include <arrow/array/util.h>
#include <arrow/scalar.h>
#include <arrow/type.h>

namespace cpp11 {

const char* r6_class_name<arrow::Scalar>::get(
    const std::shared_ptr<arrow::Scalar>& scalar) {
  if (scalar->type->id() == arrow::Type::STRUCT) {
    return "StructScalar";
  }
  return "Scalar";
}

}  // namespace cpp11

// [[arrow::export]]
std::shared_ptr<arrow::Scalar> Array__GetScalar(const std::shared_ptr<arrow::Array>& x,
                                                int64_t i) {
  return ValueOrStop(x->GetScalar(i));
}

// [[arrow::export]]
std::string Scalar__ToString(const std::shared_ptr<arrow::Scalar>& s) {
  return s->ToString();
}

// [[arrow::export]]
std::shared_ptr<arrow::Scalar> StructScalar__field(
    const std::shared_ptr<arrow::StructScalar>& s, int i) {
  return ValueOrStop(s->field(i));
}

// [[arrow::export]]
std::shared_ptr<arrow::Scalar> StructScalar__GetFieldByName(
    const std::shared_ptr<arrow::StructScalar>& s, const std::string& name) {
  return ValueOrStop(s->field(name));
}

// [[arrow::export]]
SEXP Scalar__as_vector(const std::shared_ptr<arrow::Scalar>& scalar) {
  auto array = ValueOrStop(arrow::MakeArrayFromScalar(*scalar, 1, gc_memory_pool()));

  // defined in array_to_vector.cpp
  SEXP Array__as_vector(const std::shared_ptr<arrow::Array>& array);
  return Array__as_vector(array);
}

// [[arrow::export]]
std::shared_ptr<arrow::Array> MakeArrayFromScalar(
    const std::shared_ptr<arrow::Scalar>& scalar) {
  return ValueOrStop(arrow::MakeArrayFromScalar(*scalar, 1, gc_memory_pool()));
}

// [[arrow::export]]
bool Scalar__is_valid(const std::shared_ptr<arrow::Scalar>& s) { return s->is_valid; }

// [[arrow::export]]
std::shared_ptr<arrow::DataType> Scalar__type(const std::shared_ptr<arrow::Scalar>& s) {
  return s->type;
}

// [[arrow::export]]
bool Scalar__Equals(const std::shared_ptr<arrow::Scalar>& lhs,
                    const std::shared_ptr<arrow::Scalar>& rhs) {
  return lhs->Equals(rhs);
}

// [[arrow::export]]
bool Scalar__ApproxEquals(const std::shared_ptr<arrow::Scalar>& lhs,
                          const std::shared_ptr<arrow::Scalar>& rhs) {
  return lhs->ApproxEquals(*rhs);
}

#endif