// 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 <gen_cpp/olap_file.pb.h>

#include <memory>

#include "storage/metadata_adder.h"

namespace doris {

class RuntimeState;

}

namespace doris::segment_v2 {

class IndexIterator;

class InvertedIndexReader;

using InvertedIndexReaderPtr = std::shared_ptr<InvertedIndexReader>;

class IndexReader : public std::enable_shared_from_this<IndexReader>,

                    public MetadataAdder<IndexReader> {

public:

    IndexReader() = default;

    ~IndexReader() override = default;

    virtual IndexType index_type() = 0;

    virtual uint64_t get_index_id() const = 0;

    virtual Status new_iterator(std::unique_ptr<IndexIterator>* iterator) = 0;

};

using IndexReaderPtr = std::shared_ptr<IndexReader>;

} // namespace doris::segment_v2