// 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.

// This API is EXPERIMENTAL.

#pragma once

#include <memory>
#include <vector>

#include "arrow/compute/type_fwd.h"  // IWYU pragma: export
#include "arrow/dataset/visibility.h"
#include "arrow/filesystem/type_fwd.h"  // IWYU pragma: export
#include "arrow/type_fwd.h"             // IWYU pragma: export

namespace arrow {
namespace dataset {

class Dataset;
class DatasetFactory;
using DatasetVector = std::vector<std::shared_ptr<Dataset>>;

class UnionDataset;
class UnionDatasetFactory;

class Fragment;
using FragmentIterator = Iterator<std::shared_ptr<Fragment>>;
using FragmentVector = std::vector<std::shared_ptr<Fragment>>;

class FragmentScanOptions;

class FileSource;
class FileFormat;
class FileFragment;
class FileWriter;
class FileWriteOptions;
class FileSystemDataset;
class FileSystemDatasetFactory;
struct FileSystemDatasetWriteOptions;

/// \brief Controls what happens if files exist in an output directory during a dataset
/// write
enum class ExistingDataBehavior : int8_t {
  /// Deletes all files in a directory the first time that directory is encountered
  kDeleteMatchingPartitions,
  /// Ignores existing files, overwriting any that happen to have the same name as an
  /// output file
  kOverwriteOrIgnore,
  /// Returns an error if there are any files or subdirectories in the output directory
  kError,
};

class InMemoryDataset;

class CsvFileFormat;
class CsvFileWriter;
class CsvFileWriteOptions;
struct CsvFragmentScanOptions;

class IpcFileFormat;
class IpcFileWriter;
class IpcFileWriteOptions;
class IpcFragmentScanOptions;

class ParquetFileFormat;
class ParquetFileFragment;
class ParquetFragmentScanOptions;
class ParquetFileWriter;
class ParquetFileWriteOptions;

class Partitioning;
class PartitioningFactory;
class PartitioningOrFactory;
struct KeyValuePartitioningOptions;
class DirectoryPartitioning;
class HivePartitioning;
struct HivePartitioningOptions;

struct ScanOptions;

class Scanner;

class ScannerBuilder;

class ScanTask;
using ScanTaskVector = std::vector<std::shared_ptr<ScanTask>>;
using ScanTaskIterator = Iterator<std::shared_ptr<ScanTask>>;

}  // namespace dataset
}  // namespace arrow
