PhraseQuery.h

00001 //
00002 // Copyright(C) 2005--2006 Institute of Computing Tech, Chinese Academy of Sciences. 
00003 // All rights reserved.
00004 // This file is part of FirteX (www.firtex.org)
00005 //
00006 // Use of the FirteX is subject to the terms of the software license set forth in 
00007 // the LICENSE file included with this software, and also available at
00008 // http://www.firtex.org/license.html
00009 //
00010 // Author       : 郭瑞杰(GuoRuijie)
00011 // Email        : ruijieguo@software.ict.ac.cn,ruijieguo@gmail.com
00012 // Created      : 2006/3/9
00013 //
00014 
00015 #ifndef _PHRASEQUERY_H
00016 #define _PHRASEQUERY_H
00017 
00018 #include "Query.h"
00019 #include "Weight.h"
00020 #include <vector>
00021 using namespace std;
00022 
00023 namespace firtex
00024 {
00025         namespace search
00026         {
00027                 class CTermQuery;
00028                 typedef vector<CTerm*>::iterator TermIterator;
00029                 class CPhraseQuery :    public CQuery
00030                 {
00031                         class CPhraseWeight: public CWeight
00032                         {
00033                         public:
00034                                 CPhraseWeight(CSearcher* pSearcher,CPhraseQuery* pQuery);
00035                                 virtual ~CPhraseWeight();
00036                         public:                         
00037                                 weight_t        squaredWeight();
00038                                 weight_t        getValue();
00039                                 void            normalize(float fQueryNorm);
00040                         protected:                              
00041                                 CSearcher*              m_pSearcher;
00042 
00043                                 score_t                 m_fWeight;
00044                                 score_t                 m_idf;
00045                         };
00046                 public:
00047                         CPhraseQuery(void);
00048                         CPhraseQuery(const CPhraseQuery& clone);
00049                         virtual ~CPhraseQuery(void);
00050                 public:
00051                         void            addTerm(CTerm* term);
00052                         CScorer*        scorer(CSearcher* pSearcher);
00053                         CQuery*         clone();
00054 
00055                         void            setSlop(int nSlop){m_nSlop = nSlop;}
00056                         int                     getSlop(){return m_nSlop;}
00057 
00058                         static const char* getClassName(){return "PhraseQuery";}
00059                         const char* getQueryName() const{return getClassName();}
00060                 protected:
00061                         CWeight* createWeight(CSearcher* pSearcher);
00062                 protected:
00063                         vector<CTerm*>m_terms;
00064                         CTermQuery*             m_pTermQuery;
00065                         int                             m_nSlop;
00066 
00067                         friend class CPhraseQuery::CPhraseWeight;
00068                 };
00069         }
00070 }
00071 
00072 #endif