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StructQueryRep.hpp

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/*==========================================================================
 * Copyright (c) 2002 University of Massachusetts.  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
 *
 *==========================================================================
*/
/*
  author: fff
*/

#ifndef _STRUCTQUERYREP_HPP
#define _STRUCTQUERYREP_HPP

#include "RetrievalMethod.hpp"
#include "Document.hpp"
#include "Index.hpp"
#include "QueryNode.hpp"

//------------------------------------------------------------
//      Abstract Interface for Structured Query 
//------------------------------------------------------------

class StructQuery : public Query {
public:
  StructQuery(Document &doc) : d(doc) {}
  virtual ~StructQuery() {}

  virtual char *id() { return d.getID();}
  virtual void startTermIteration() { d.startTermIteration();}
  virtual bool hasMore() { return d.hasMore();}
  virtual TokenTerm *nextTerm() { return d.nextTerm();}
private:
  Document &d;
};


class StructQueryRep : public QueryRep {
public:
  StructQueryRep(StructQuery &qry, Index &dbIndex, 
                 double dbelief = 0);

  virtual ~StructQueryRep() {
    delete(topNode);
  }
  virtual QueryNode * topnode() {return topNode;}
  virtual void setTopnode(QueryNode *qn) {topNode = qn;}
  
private:
  typedef QueryNode *(StructQueryRep::*getFunc)(StructQuery &, TokenTerm *, 
                                                double);
  QnList * getChildren(StructQuery &qry, getFunc fn, 
                               bool weigh = false);
  QueryNode * getQryNode(StructQuery &qry, TokenTerm *tok, double w);
  QueryNode * getProxQryNode(StructQuery &qry, TokenTerm *tok,
                                     double w = 1.0);
  QueryNode *topNode;
  QueryNode *qStack[100]; 

  int topqStack;
  double dw;
  Index &ind;
  int numDocs;
};
#endif /* _STRUCTQUERYREP_HPP */

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