// 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.
// Transform stream implementations
#pragma once
#include <cstdint>
#include <functional>
#include <memory>
#include <utility>
#include "arrow/io/interfaces.h"
#include "arrow/util/visibility.h"
namespace arrow {
namespace io {
class ARROW_EXPORT TransformInputStream : public InputStream {
public:
using TransformFunc =
std::function<Result<std::shared_ptr<Buffer>>(const std::shared_ptr<Buffer>&)>;
TransformInputStream(std::shared_ptr<InputStream> wrapped, TransformFunc transform);
~TransformInputStream() override;
Status Close() override;
Status Abort() override;
bool closed() const override;
Result<int64_t> Read(int64_t nbytes, void* out) override;
Result<std::shared_ptr<Buffer>> Read(int64_t nbytes) override;
Result<std::shared_ptr<const KeyValueMetadata>> ReadMetadata() override;
Future<std::shared_ptr<const KeyValueMetadata>> ReadMetadataAsync(
const IOContext& io_context) override;
Result<int64_t> Tell() const override;
protected:
struct Impl;
std::unique_ptr<Impl> impl_;
};
} // namespace io
} // namespace arrow