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FreqVector.hpp

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/*==========================================================================
 * 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.cs.cmu.edu/~lemur/license.html
 *
 *==========================================================================
*/


#ifndef _FREQVECTOR_HPP
#define _FREQVECTOR_HPP

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

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

class FreqVector {
public:

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


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

  virtual ~HashFreqVector() {};

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

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

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

#endif /* _FREQVECTOR_HPP */

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