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https://github.com/aykhans/AzSuicideDataVisualization.git
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61 lines
1.9 KiB
C++
61 lines
1.9 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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// Slow stream implementations, mainly for testing and benchmarking
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#pragma once
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#include <cstdint>
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#include <functional>
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#include <memory>
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#include <utility>
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#include "arrow/io/interfaces.h"
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#include "arrow/util/visibility.h"
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namespace arrow {
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namespace io {
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class ARROW_EXPORT TransformInputStream : public InputStream {
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public:
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using TransformFunc =
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std::function<Result<std::shared_ptr<Buffer>>(const std::shared_ptr<Buffer>&)>;
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TransformInputStream(std::shared_ptr<InputStream> wrapped, TransformFunc transform);
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~TransformInputStream() override;
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Status Close() override;
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Status Abort() override;
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bool closed() const override;
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Result<int64_t> Read(int64_t nbytes, void* out) override;
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Result<std::shared_ptr<Buffer>> Read(int64_t nbytes) override;
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Result<std::shared_ptr<const KeyValueMetadata>> ReadMetadata() override;
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Future<std::shared_ptr<const KeyValueMetadata>> ReadMetadataAsync(
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const IOContext& io_context) override;
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Result<int64_t> Tell() const override;
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protected:
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struct Impl;
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std::unique_ptr<Impl> impl_;
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};
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} // namespace io
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} // namespace arrow
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