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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 "pagedict4file.h"
namespace search::diskindex {
/*
* Helper class, will be used by fusion later to handle generation of
* word numbering without writing a word list file.
*/
class WordAggregator
{
private:
vespalib::string _word;
uint64_t _wordNum;
public:
WordAggregator()
: _word(),
_wordNum(0)
{
}
void tryWriteWord(vespalib::stringref word) {
if (word != _word || _wordNum == 0) {
++_wordNum;
_word = word;
}
}
uint64_t getWordNum() const { return _wordNum; }
};
/*
* Class used to merge words in multiple dictionaries for
* new style fusion (using WordAggregator).
*/
class DictionaryWordReader
{
public:
vespalib::string _word;
uint64_t _wordNum;
index::PostingListCounts _counts;
private:
// "owners" of file handles.
std::unique_ptr<FastOS_FileInterface> _old2newwordfile;
using DictionaryFileSeqRead = index::DictionaryFileSeqRead;
std::unique_ptr<DictionaryFileSeqRead> _dictFile;
static uint64_t noWordNumHigh() { return std::numeric_limits<uint64_t>::max(); }
static uint64_t noWordNum() { return 0u; }
public:
DictionaryWordReader();
~DictionaryWordReader();
bool isValid() const {
return _wordNum != noWordNumHigh();
}
bool operator<(const DictionaryWordReader &rhs) const {
if (!isValid()) {
return false;
}
if (!rhs.isValid()) {
return true;
}
return _word < rhs._word;
}
void read() {
_dictFile->readWord(_word, _wordNum, _counts);
}
bool open(const vespalib::string & dictionaryName,
const vespalib::string & wordMapName,
const TuneFileSeqRead &tuneFileRead);
void close();
void writeNewWordNum(uint64_t newWordNum);
void write(WordAggregator &writer) {
writer.tryWriteWord(_word);
writeNewWordNum(writer.getWordNum());
}
};
}
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