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//
// Fuzzy.cc
//
// Fuzzy: This is the base class for all the different types of fuzzy searches.
// We only define the interface.
//
// There are two main uses of classes derived from this class:
// 1) Creation of a fuzzy index
// 2) Searching for a word using the fuzzy index
//
// Part of the ht://Dig package <https://htdig.sourceforge.net/>
// Copyright (c) 1995-2004 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Library General Public License (LGPL) version 2 or later
// <http://www.gnu.org/copyleft/lgpl.html>
//
// $Id: Fuzzy.cc,v 1.20 2004/05/28 13:15:20 lha Exp $
//
#ifdef HAVE_CONFIG_H
#include "htconfig.h"
#endif /* HAVE_CONFIG_H */
#include <fcntl.h>
#include "Fuzzy.h"
#include "htfuzzy.h"
#include "HtConfiguration.h"
#include "List.h"
#include "StringList.h"
#include "Endings.h"
#include "Exact.h"
#include "Metaphone.h"
#include "Soundex.h"
#include "Synonym.h"
#include "Substring.h"
#include "Prefix.h"
#include "Regexp.h"
#include "Speling.h"
#include "Accents.h"
//*****************************************************************************
// Fuzzy::Fuzzy(const HtConfiguration& config)
//
Fuzzy::Fuzzy(const HtConfiguration& config_arg) :
config(config_arg)
{
dict = 0;
index = 0;
}
//*****************************************************************************
// Fuzzy::~Fuzzy()
//
Fuzzy::~Fuzzy()
{
if (index)
{
index->Close();
delete index;
index = 0;
}
delete dict;
}
//*****************************************************************************
// void Fuzzy::getWords(char *word, List &words)
//
void
Fuzzy::getWords(char *word, List &words)
{
if (!index)
return;
if (!word || !*word)
return;
//
// Convert the word to a fuzzy key
//
String fuzzyKey;
String data;
String stripped = word;
HtStripPunctuation(stripped);
generateKey(stripped, fuzzyKey);
if (debug > 2)
cout << "\n\tkey: " << fuzzyKey << endl;
words.Destroy();
if (index->Get(fuzzyKey, data) == OK)
{
//
// Found the entry
//
char *token = strtok(data.get(), " ");
while (token)
{
if (mystrcasecmp(token, word) != 0)
{
words.Add(new String(token));
}
token = strtok(0, " ");
}
}
else
{
//
// The key wasn't found.
//
}
}
//*****************************************************************************
// int Fuzzy::openIndex(const HtConfiguration &config)
//
int
Fuzzy::openIndex()
{
String var = name;
var << "_db";
const String filename = config[var];
index = Database::getDatabaseInstance(DB_HASH);
if (index->OpenRead(filename) == NOTOK)
{
delete index;
index = 0;
return NOTOK;
}
return OK;
}
//*****************************************************************************
// int Fuzzy::writeDB(HtConfiguration &config)
//
int
Fuzzy::writeDB()
{
String var = name;
var << "_db";
const String filename = config[var];
index = Database::getDatabaseInstance(DB_HASH);
if (index->OpenReadWrite(filename, 0664) == NOTOK)
return NOTOK;
String *s;
char *fuzzyKey;
int count = 0;
dict->Start_Get();
while ((fuzzyKey = dict->Get_Next()))
{
s = (String *) dict->Find(fuzzyKey);
index->Put(fuzzyKey, *s);
if (debug > 1)
{
cout << "htfuzzy: '" << fuzzyKey << "' ==> '" << s->get() << "'\n";
}
count++;
if ((count % 100) == 0 && debug == 1)
{
cout << "htfuzzy: keys: " << count << '\n';
cout.flush();
}
}
if (debug == 1)
{
cout << "htfuzzy:Total keys: " << count << "\n";
}
return OK;
}
//*****************************************************************************
// Fuzzy algorithm factory.
//
Fuzzy *
Fuzzy::getFuzzyByName(char *name, const HtConfiguration& config)
{
if (mystrcasecmp(name, "exact") == 0)
return new Exact(config);
else if (mystrcasecmp(name, "soundex") == 0)
return new Soundex(config);
else if (mystrcasecmp(name, "metaphone") == 0)
return new Metaphone(config);
else if (mystrcasecmp(name, "accents") == 0)
return new Accents(config);
else if (mystrcasecmp(name, "endings") == 0)
return new Endings(config);
else if (mystrcasecmp(name, "synonyms") == 0)
return new Synonym(config);
else if (mystrcasecmp(name, "substring") == 0)
return new Substring(config);
else if (mystrcasecmp(name, "prefix") == 0)
return new Prefix(config);
else if (mystrcasecmp(name, "regex") == 0)
return new Regexp(config);
else if (mystrcasecmp(name, "speling") == 0)
return new Speling(config);
else
return 0;
}
//*****************************************************************************
int
Fuzzy::createDB(const HtConfiguration &)
{
return OK;
}
void
Fuzzy::generateKey(char *, String &)
{
}
void
Fuzzy::addWord(char *)
{
}
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