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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 <memory>
#include "arrow/python/common.h"
#include "arrow/python/visibility.h"
#include "arrow/record_batch.h"
#include "arrow/result.h"
#include "arrow/util/macros.h"
namespace arrow {
namespace py {
class ARROW_PYTHON_EXPORT PyRecordBatchReader : public RecordBatchReader {
public:
std::shared_ptr<Schema> schema() const override;
Status ReadNext(std::shared_ptr<RecordBatch>* batch) override;
// For use from Cython
// Assumes that `iterable` is borrowed
static Result<std::shared_ptr<RecordBatchReader>> Make(std::shared_ptr<Schema>,
PyObject* iterable);
protected:
PyRecordBatchReader();
Status Init(std::shared_ptr<Schema>, PyObject* iterable);
std::shared_ptr<Schema> schema_;
OwnedRefNoGIL iterator_;
};
class ARROW_PYTHON_EXPORT CastingRecordBatchReader : public RecordBatchReader {
public:
std::shared_ptr<Schema> schema() const override;
Status ReadNext(std::shared_ptr<RecordBatch>* batch) override;
static Result<std::shared_ptr<RecordBatchReader>> Make(
std::shared_ptr<RecordBatchReader> parent, std::shared_ptr<Schema> schema);
Status Close() override;
protected:
CastingRecordBatchReader();
Status Init(std::shared_ptr<RecordBatchReader> parent, std::shared_ptr<Schema> schema);
std::shared_ptr<RecordBatchReader> parent_;
std::shared_ptr<Schema> schema_;
};
} // namespace py
} // namespace arrow
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