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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "pagedict4file.h"
#include <vespa/fastlib/io/bufferedfile.h>
namespace search
{
namespace 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(const 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<Fast_BufferedFile> _old2newwordfile;
using DictionaryFileSeqRead = index::DictionaryFileSeqRead;
std::unique_ptr<DictionaryFileSeqRead> _dictFile;
void
allocFiles();
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::stringref & dictionaryName,
const vespalib::stringref & wordMapName,
const TuneFileSeqRead &tuneFileRead);
void
close();
void
writeNewWordNum(uint64_t newWordNum)
{
_old2newwordfile->WriteBuf(&newWordNum, sizeof(newWordNum));
}
void
write(WordAggregator &writer)
{
writer.tryWriteWord(_word);
writeNewWordNum(writer.getWordNum());
}
};
} // namespace diskindex
} // namespace search
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