---

FreqVector.hpp

Go to the documentation of this file.

/*==========================================================================
 * Copyright (c) 2001 Carnegie Mellon University.  All Rights Reserved.
 *
 * Use of the Lemur Toolkit for Language Modeling and Information Retrieval
 * is subject to the terms of the software license set forth in the LICENSE
 * file included with this software, and also available at
 * http://www.lemurproject.org/license.html
 *
 *==========================================================================
*/


#ifndef _FREQVECTOR_HPP
#define _FREQVECTOR_HPP

#include "ByteHash.hpp"
#include "Index.hpp"
#include "CSet.hpp"

class FreqCount {
public:
  TERMID_T key;
  unsigned int Hash() const { return ByteHash((char *)(&key),sizeof(TERMID_T),0); }
  unsigned int hash() const { return Hash(); }
  bool operator==(const FreqCount count) { return count.key == this->key;} 
};
  

class FreqVector {
public:

  virtual bool find(TERMID_T ind, int &freq) const=0;
  virtual void startIteration()const=0;
  virtual bool hasMore()const=0;
  virtual void nextFreq(TERMID_T &id, int &freq)const=0;
  virtual int size()const=0;
};


class HashFreqVector : public FreqVector, public CSet<FreqCount, int> {
public:
  HashFreqVector() : CSet<FreqCount, int>(300) {}
  HashFreqVector(const Index &index, DOCID_T docID);

  virtual ~HashFreqVector() {};

  
  virtual bool find(DOCID_T ind, int &freq)const ;

  virtual void startIteration() const {  i=0; }
  virtual bool hasMore() const {  return (i < size()); }
  virtual void nextFreq(DOCID_T &id, int &freq)const ;

  virtual int size() const {    return (ISet<FreqCount>::size()); }
protected:
  mutable int i;
};

#endif /* _FREQVECTOR_HPP */

---