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Copy pathformatting_utils.h
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69 lines (60 loc) · 2.65 KB
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// 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 "arrow/type.h"
#include "arrow/util/formatting.h"
#include "arrow/vendored/double-conversion/double-conversion.h"
namespace gandiva {
/// \brief The entry point for conversion to strings.
template <typename ARROW_TYPE, typename Enable = void>
class GdvStringFormatter;
using double_conversion::DoubleToStringConverter;
template <typename ARROW_TYPE>
class FloatToStringGdvMixin
: public arrow::internal::FloatToStringFormatterMixin<ARROW_TYPE> {
public:
using arrow::internal::FloatToStringFormatterMixin<
ARROW_TYPE>::FloatToStringFormatterMixin;
// The mixin is a modified version of the existent FloatToStringFormatterMixin, but
// it defines some specific parameters in the FloatToStringFormatterMixin to cast
// the float numbers to string using the same patterns like Java.
//
// The Java real numbers are represented in two ways following these rules:
//- If the number is greater or equals than 10^7 and less than 10^(-3)
// it will be represented using scientific notation, e.g:
// - 0.000012 -> 1.2E-5
// - 10000002.3 -> 1.00000023E7
//- If the numbers are between that interval above, they are showed as is.
explicit FloatToStringGdvMixin(const std::shared_ptr<arrow::DataType>& = NULLPTR)
: arrow::internal::FloatToStringFormatterMixin<ARROW_TYPE>(
DoubleToStringConverter::EMIT_TRAILING_ZERO_AFTER_POINT |
DoubleToStringConverter::EMIT_TRAILING_DECIMAL_POINT,
"Infinity", "NaN", 'E', -3, 7, 3, 1) {}
};
template <>
class GdvStringFormatter<arrow::FloatType>
: public FloatToStringGdvMixin<arrow::FloatType> {
public:
using FloatToStringGdvMixin::FloatToStringGdvMixin;
};
template <>
class GdvStringFormatter<arrow::DoubleType>
: public FloatToStringGdvMixin<arrow::DoubleType> {
public:
using FloatToStringGdvMixin::FloatToStringGdvMixin;
};
} // namespace gandiva