// 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.

#pragma once

#include <cstddef>

#include "common/status.h"

#include "util/profile_collector.h"

namespace doris {

class Block;

// Shared block interface for metadata scans and the JDBC scanner. File scans use format::TableReader.

class GenericReader : public ProfileCollector {

public:

    ~GenericReader() override = default;

    Status get_next_block(Block* block, size_t* read_rows, bool* eof) {

        return _do_get_next_block(block, read_rows, eof);

    }

    virtual Status close() { return Status::OK(); }

    virtual void set_batch_size(size_t) {}

    virtual size_t get_batch_size() const { return 0; }

protected:

    virtual Status _do_get_next_block(Block* block, size_t* read_rows, bool* eof) = 0;

};

} // namespace doris