cpp/src/parquet/properties.cc

// 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.

#include <utility>

#include "parquet/properties.h"

#include "arrow/io/buffered.h"
#include "arrow/io/memory.h"

namespace parquet {

std::shared_ptr<ArrowInputStream> ReaderProperties::GetStream(
    std::shared_ptr<ArrowInputFile> source, int64_t start, int64_t num_bytes) {
  if (buffered_stream_enabled_) {
    std::shared_ptr<::arrow::io::BufferedInputStream> stream;
    PARQUET_THROW_NOT_OK(source->Seek(start));
    PARQUET_THROW_NOT_OK(::arrow::io::BufferedInputStream::Create(
        buffer_size_, pool_, source, &stream, num_bytes));
    return std::move(stream);
  } else {
    std::shared_ptr<Buffer> data;
    PARQUET_THROW_NOT_OK(source->ReadAt(start, num_bytes, &data));
    return std::make_shared<::arrow::io::BufferReader>(data);
  }
}

}  // namespace parquet