ClickHouse/dbms/include/DB/Dictionaries/OwningBlockInputStream.h

#pragma once

#include <memory>

#include <DB/DataStreams/IProfilingBlockInputStream.h>

namespace DB
{

/** Provides reading from a Buffer, taking exclusive ownership over it's lifetime,
*    simplifies usage of ReadBufferFromFile (no need to manage buffer lifetime) etc.
*/
template <typename OwnType>
class OwningBlockInputStream : public IProfilingBlockInputStream
{
public:
    OwningBlockInputStream(const BlockInputStreamPtr & stream, std::unique_ptr<OwnType> own)
        : stream{stream}, own{std::move(own)}
    {
        children.push_back(stream);
    }

private:
    Block readImpl() override { return stream->read(); }

    String getName() const override { return "Owning"; }

    String getID() const override {  return "Owning(" + stream->getID() + ")"; }

    BlockInputStreamPtr stream;
    std::unique_ptr<OwnType> own;
};

}