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113 lines
2.9 KiB
113 lines
2.9 KiB
3 years ago
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//
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// Fuzzy.h
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//
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// Fuzzy: This is the base class for all the different types of fuzzy searches.
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// We only define the interface.
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//
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// There are two main uses of classes derived from this class:
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// 1) Creation of a fuzzy index
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// 2) Searching for a word using the fuzzy index
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//
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// The Fuzzy classes take the raw words from the user's query and generate
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// a list of words to be looked up in the database. These words are created
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// using the getWords call and can either be picked off from a separate fuzzy
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// database specific to the method, or by generating words on the fly.
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1995-2004 The ht://Dig Group
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// For copyright details, see the file COPYING in your distribution
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// or the GNU Library General Public License (LGPL) version 2 or later
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// <http://www.gnu.org/copyleft/lgpl.html>
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//
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// $Id: Fuzzy.h,v 1.12 2004/05/28 13:15:20 lha Exp $
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//
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#ifndef _Fuzzy_h_
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#define _Fuzzy_h_
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#include "Object.h"
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#include "htString.h"
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#include "Database.h"
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#include "HtWordType.h"
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#include "HtWordList.h"
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class HtConfiguration;
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class Dictionary;
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class List;
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class Fuzzy : public Object
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{
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public:
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//
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// Construction/Destruction
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//
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Fuzzy(const HtConfiguration& config);
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virtual ~Fuzzy();
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//
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// Given a single work, generate a list of replacement words using
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// the current algorithm.
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//
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virtual void getWords(char *word, List &words);
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//
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// For the current algorithm, open the key database
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//
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virtual int openIndex();
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//
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// For searching, we will need to keep track of the weight associated
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// with a particular fuzzy algorithm.
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//
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void setWeight(double w) {weight = w;}
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double getWeight() {return weight;}
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//*******************************************************************
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// The following are used in the creation of the fuzzy databases.
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//
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// For the current algorithm, write the database to disk.
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//
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virtual int writeDB();
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//
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// For the current algorithm, create the database.
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// This is for those algoritms that don't need a list of words
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// to work.
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//
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virtual int createDB(const HtConfiguration &config);
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//
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// Given a word from the htdig word database, create the appropriate
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// entries into memory which will later be written out with writeDB().
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//
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virtual void addWord(char *word);
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//
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// Each algorithm has a name...
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//
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char *getName() {return name;}
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//
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// Fuzzy algorithm factory. This returns a new Fuzzy algorithm
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// object that belongs to the given name.
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//
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static Fuzzy *getFuzzyByName(char *name, const HtConfiguration& config);
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protected:
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//
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// Given a single word, generate a database key
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//
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virtual void generateKey(char *word, String &key);
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char *name;
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Database *index;
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Dictionary *dict;
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double weight;
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const HtConfiguration& config;
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};
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#endif
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