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132 lines
4.2 KiB
132 lines
4.2 KiB
/* ****************************************************************************
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Copyright (C) 2003-2004 Eva Brucherseifer <eva.brucherseifer@basyskom.com>
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2005 Stanislav Visnovsky <visnovsky@kde.org>
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This file is part of the KDE project
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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In addition, as a special exception, the copyright holders give
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permission to link the code of this program with any edition of
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the Qt library by Trolltech AS, Norway (or with modified versions
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of Qt that use the same license as Qt), and distribute linked
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combinations including the two. You must obey the GNU General
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Public License in all respects for all of the code used other than
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Qt. If you modify this file, you may extend this exception to
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your version of the file, but you are not obligated to do so. If
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you do not wish to do so, delete this exception statement from
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your version.
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**************************************************************************** */
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#ifndef STRINGDISTANCE_H
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#define STRINGDISTANCE_H
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#include <qstring.h>
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//#include <boost/numeric/ublas/matrix.hpp>
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/** Private copy constructor and copy assignment ensure classes derived from
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* class noncopyable cannot be copied.
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* Taken from Boost library
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* Contributed by Dave Abrahams
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*
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* If anyone needs a namespace here, please tell me at eva@rt.e-technik.tu-darmstadt.de
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*/
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class NonCopyable
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{
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protected:
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NonCopyable(){}
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virtual ~NonCopyable(){}
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private: // emphasize the following members are private
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NonCopyable( const NonCopyable& );
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const NonCopyable& operator=( const NonCopyable& );
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};
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/**
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* @class Distance
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* @author Eva Brucherseifer
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*
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* The class Distance calculates the distance
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* between two Entities (left & right).
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* It is the parent for other distance-classes.
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*/
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class Distance : public NonCopyable
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{
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public:
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virtual ~Distance(){}
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double operator()(const QString& left, const QString& right);
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int editCostReplace() { return editCost_replace_base; }
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static int debug;
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protected:
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virtual double calculate(const QString& left_string, const QString& right_string) = 0;
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int nodeDistance(const QString& left_letter, const QString& right_letter);
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static const int editCost_replace_base;
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double m_distance;
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};
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double relativeDistance(double distance, const QString& left_string, const QString right_string);
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/**
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* @class HammingDistance
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* @author Eva Brucherseifer
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*
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* The class HammingDistance is based on an algorithm
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* of Hamming. It increase the distance if the nodes from
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* the tree are not the same. Also called edit-distance.
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*/
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class HammingDistance : public Distance
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{
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protected:
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virtual double calculate(const QString& left_string, const QString& right_string);
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int editCostReplace() { return editCost; }
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static const int editCost;
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};
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/**
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* @class LevenshteinDistance
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* @author Eva Brucherseifer
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*
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* The class LevenshteinDistance is based on an algorithm
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* of Levenshtein. It search for the minimum distance of
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* two trees. You can specify the distance between
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* a gap & a node and between two different nodes.
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*/
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class LevenshteinDistance : public Distance
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{
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protected:
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virtual double calculate(const QString& left_string, const QString& right_string);
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int editCostReplace() { return editCost_replace; }
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static const int editCost_replace;
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static const int editCost_insert;
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static const int editCost_delete;
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};
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/** wrapper function for replacement of fstrcmp from gettext */
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inline double fstrcmp(const QString& left, const QString& right)
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{
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return LevenshteinDistance()(left,right);
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}
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#endif
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