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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "postinglistcounts.h"
#include <vespa/searchlib/common/tunefileinfo.h>
#include <vespa/vespalib/stllike/string.h>
namespace search::common { class FileHeaderContext; }
namespace search::index {
class PostingListCounts;
class PostingListHandle;
class PostingListParams;
/**
* Interface for count files describing where in a posting list file
* the various words are located. It is merged at index time with a
* text-only dictionary to produce a binary dictionary optimized for
* random access used at search time.
*
* TODO: Might want to allow semi-random access for prefix searches,
* allowing for less data in posting list files being duplicated from
* the count file.
*/
class PostingListCountFileSeqRead {
public:
PostingListCountFileSeqRead();
virtual ~PostingListCountFileSeqRead();
/**
* Open posting list count file for sequential read.
*/
virtual bool open(const vespalib::string &name, const TuneFileSeqRead &tuneFileRead) = 0;
/**
* Close posting list count file.
*/
virtual bool close() = 0;
/*
* Get current parameters.
*/
virtual void getParams(PostingListParams ¶ms);
};
class PostingListCountFileSeqWrite {
public:
PostingListCountFileSeqWrite();
virtual ~PostingListCountFileSeqWrite();
/**
* Open posting list count file for sequential write.
*/
virtual bool open(const vespalib::string &name,
const TuneFileSeqWrite &tuneFileWrite,
const common::FileHeaderContext &fileHeaderContext) = 0;
/**
* Close posting list count file.
*/
virtual bool close() = 0;
/*
* Set parameters.
*/
virtual void setParams(const PostingListParams ¶ms);
/*
* Get current parameters.
*/
virtual void getParams(PostingListParams ¶ms);
};
}
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