src/Element.h

/*  -*- C++ -*-

    textIR - A fast text document retrieval engine

    Copyright (C) 2005-2009 Laurence Park

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    File information:
    $Header: /home/staff/lapark/cvsroot/web_search/textIR/src/Element.h,v 1.4 2009/10/08 06:41:30 lapark Exp $
*/

#ifndef ELEMENT_H
#define ELEMENT_H

#include "FileIO.h"

template <typename T>
class CompareElements {
 public:

  bool operator() (const T *x, const T *y) {
    //    return (x->_documentCount < y->_documentCount);
    return(*x < *y);
  }
};

class Element {
 public:

  Element(char *name, int number, FILE_POS_TYPE filePosition = 0);
  ~Element(void);

  void assignPosition(FILE_POS_TYPE position);

  FILE_POS_TYPE filePosition(void);

  char *name(void);

  int number(void);

  bool operator< (const Element &word) const;

  bool operator== (const Element &word) const;

  void operator= (const Element &word);

  void purge(FileIO *file);

  void salvage(FileIO *file);

  void hashNumber(int number);
  int hashNumber(void);

  friend class OrderElements;

 protected:
  Element(void);
  int _number;

 private:
  char *_name;
  int _nameLength;
  FILE_POS_TYPE _filePosition;

  //for plsa
  int _hashNumber;
};


class OrderElements {
 public:

  bool operator() (const Element *x, const Element *y) {
    return (x->_number < y->_number);
  }
};


#endif

---