text: // 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 <sstream>
  #include <utility>
  
  #include "parquet/properties.h"
  
  #include "arrow/io/buffered.h"
  #include "arrow/io/memory.h"
  #include "arrow/util/logging.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_) {
      // ARROW-6180 / PARQUET-1636 Create isolated reader that references segment
      // of source
      std::shared_ptr<::arrow::io::InputStream> safe_stream =
          ::arrow::io::RandomAccessFile::GetStream(source, start, num_bytes);
      PARQUET_ASSIGN_OR_THROW(
          auto stream, ::arrow::io::BufferedInputStream::Create(buffer_size_, pool_,
                                                                safe_stream, num_bytes));
      return std::move(stream);
    } else {
      PARQUET_ASSIGN_OR_THROW(auto data, source->ReadAt(start, num_bytes));
  
      if (data->size() != num_bytes) {
        std::stringstream ss;
        ss << "Tried reading " << num_bytes << " bytes starting at position " << start
           << " from file but only got " << data->size();
        throw ParquetException(ss.str());
      }
      return std::make_shared<::arrow::io::BufferReader>(data);
    }
  }
  
  ArrowReaderProperties default_arrow_reader_properties() {
    static ArrowReaderProperties default_reader_props;
    return default_reader_props;
  }
  
  std::shared_ptr<ArrowWriterProperties> default_arrow_writer_properties() {
    static std::shared_ptr<ArrowWriterProperties> default_writer_properties =
        ArrowWriterProperties::Builder().build();
    return default_writer_properties;
  }
  
  }  // namespace parquet
  