mirror of
https://github.com/aykhans/AzSuicideDataVisualization.git
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117 lines
3.5 KiB
C++
117 lines
3.5 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 <memory>
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#include "arrow/io/interfaces.h"
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#include "arrow/io/transform.h"
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#include "arrow/python/common.h"
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#include "arrow/python/visibility.h"
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namespace arrow {
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namespace py {
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class ARROW_NO_EXPORT PythonFile;
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class ARROW_PYTHON_EXPORT PyReadableFile : public io::RandomAccessFile {
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public:
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explicit PyReadableFile(PyObject* file);
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~PyReadableFile() 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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// Thread-safe version
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Result<int64_t> ReadAt(int64_t position, int64_t nbytes, void* out) override;
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// Thread-safe version
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Result<std::shared_ptr<Buffer>> ReadAt(int64_t position, int64_t nbytes) override;
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Result<int64_t> GetSize() override;
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Status Seek(int64_t position) override;
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Result<int64_t> Tell() const override;
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private:
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std::unique_ptr<PythonFile> file_;
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};
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class ARROW_PYTHON_EXPORT PyOutputStream : public io::OutputStream {
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public:
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explicit PyOutputStream(PyObject* file);
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~PyOutputStream() 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> Tell() const override;
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Status Write(const void* data, int64_t nbytes) override;
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Status Write(const std::shared_ptr<Buffer>& buffer) override;
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private:
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std::unique_ptr<PythonFile> file_;
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int64_t position_;
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};
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// TODO(wesm): seekable output files
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// A Buffer subclass that keeps a PyObject reference throughout its
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// lifetime, such that the Python object is kept alive as long as the
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// C++ buffer is still needed.
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// Keeping the reference in a Python wrapper would be incorrect as
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// the Python wrapper can get destroyed even though the wrapped C++
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// buffer is still alive (ARROW-2270).
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class ARROW_PYTHON_EXPORT PyForeignBuffer : public Buffer {
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public:
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static Status Make(const uint8_t* data, int64_t size, PyObject* base,
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std::shared_ptr<Buffer>* out);
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private:
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PyForeignBuffer(const uint8_t* data, int64_t size, PyObject* base)
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: Buffer(data, size) {
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Py_INCREF(base);
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base_.reset(base);
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}
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OwnedRefNoGIL base_;
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};
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// All this rigamarole because Cython is really poor with std::function<>
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using TransformCallback = std::function<void(
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PyObject*, const std::shared_ptr<Buffer>& src, std::shared_ptr<Buffer>* out)>;
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struct TransformInputStreamVTable {
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TransformCallback transform;
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};
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ARROW_PYTHON_EXPORT
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std::shared_ptr<::arrow::io::InputStream> MakeTransformInputStream(
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std::shared_ptr<::arrow::io::InputStream> wrapped, TransformInputStreamVTable vtable,
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PyObject* arg);
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} // namespace py
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} // namespace arrow
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