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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/searchlib/index/dictionaryfile.h>
#include <vespa/searchlib/bitcompression/compression.h>
#include <vespa/searchlib/bitcompression/countcompression.h>
#include <vespa/searchlib/bitcompression/pagedict4.h>
namespace search::diskindex {
class PageDict4RandRead : public index::DictionaryFileRandRead
{
using DC = bitcompression::PostingListCountFileDecodeContext;
using SSReader = bitcompression::PageDict4SSReader;
using SSLookupRes = bitcompression::PageDict4SSLookupRes;
using SPLookupRes = bitcompression::PageDict4SPLookupRes;
using PLookupRes = bitcompression::PageDict4PLookupRes;
using PageDict4PageParams = bitcompression::PageDict4PageParams;
using PostingListCounts = index::PostingListCounts;
using PostingListOffsetAndCounts = index::PostingListOffsetAndCounts;
std::unique_ptr<SSReader> _ssReader;
DC _ssd;
ComprFileReadContext _ssReadContext;
std::unique_ptr<FastOS_FileInterface> _ssfile;
std::unique_ptr<FastOS_FileInterface> _spfile;
std::unique_ptr<FastOS_FileInterface> _pfile;
uint64_t _ssFileBitSize;
uint64_t _spFileBitSize;
uint64_t _pFileBitSize;
uint32_t _ssHeaderLen;
uint32_t _spHeaderLen;
uint32_t _pHeaderLen;
void readSSHeader();
void readSPHeader();
void readPHeader();
public:
PageDict4RandRead();
~PageDict4RandRead();
bool lookup(vespalib::stringref word, uint64_t &wordNum,
PostingListOffsetAndCounts &offsetAndCounts) override;
bool open(const vespalib::string &name, const TuneFileRandRead &tuneFileRead) override;
bool close() override;
uint64_t getNumWordIds() const override;
};
}
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