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84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <chrono>
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#include <memory>
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#include <utility>
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#include "arrow/type_fwd.h"
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#include "arrow/util/visibility.h"
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namespace arrow {
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namespace util {
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enum DivideOrMultiply {
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MULTIPLY,
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DIVIDE,
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};
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ARROW_EXPORT
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std::pair<DivideOrMultiply, int64_t> GetTimestampConversion(TimeUnit::type in_unit,
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TimeUnit::type out_unit);
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// Converts a Timestamp value into another Timestamp value.
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//
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// This function takes care of properly transforming from one unit to another.
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//
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// \param[in] in the input type. Must be TimestampType.
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// \param[in] out the output type. Must be TimestampType.
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// \param[in] value the input value.
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//
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// \return The converted value, or an error.
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ARROW_EXPORT Result<int64_t> ConvertTimestampValue(const std::shared_ptr<DataType>& in,
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const std::shared_ptr<DataType>& out,
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int64_t value);
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template <typename Visitor, typename... Args>
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decltype(std::declval<Visitor>()(std::chrono::seconds{}, std::declval<Args&&>()...))
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VisitDuration(TimeUnit::type unit, Visitor&& visitor, Args&&... args) {
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switch (unit) {
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default:
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case TimeUnit::SECOND:
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break;
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case TimeUnit::MILLI:
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return visitor(std::chrono::milliseconds{}, std::forward<Args>(args)...);
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case TimeUnit::MICRO:
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return visitor(std::chrono::microseconds{}, std::forward<Args>(args)...);
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case TimeUnit::NANO:
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return visitor(std::chrono::nanoseconds{}, std::forward<Args>(args)...);
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}
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return visitor(std::chrono::seconds{}, std::forward<Args>(args)...);
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}
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/// Convert a count of seconds to the corresponding count in a different TimeUnit
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struct CastSecondsToUnitImpl {
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template <typename Duration>
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int64_t operator()(Duration, int64_t seconds) {
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auto duration = std::chrono::duration_cast<Duration>(std::chrono::seconds{seconds});
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return static_cast<int64_t>(duration.count());
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}
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};
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inline int64_t CastSecondsToUnit(TimeUnit::type unit, int64_t seconds) {
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return VisitDuration(unit, CastSecondsToUnitImpl{}, seconds);
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}
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} // namespace util
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} // namespace arrow
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