BooleanQuery.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      : 2006/5/9
00013 //
00014 #ifndef _BOOLEANQUERY_H
00015 #define _BOOLEANQUERY_H
00016 
00017 #include <vector>
00018 #include "Query.h"
00019 #include "Weight.h"
00020 
00021 using namespace std;
00022 
00023 namespace firtex
00024 {
00025         namespace search
00026         {
00027                 class CBooleanClause;
00028                 typedef vector<CBooleanClause*> ClauseVector;
00029                 typedef ClauseVector::const_iterator ClauseIterator;
00030                 class CBooleanQuery : public CQuery
00031                 {
00032                         typedef vector<CWeight*> WeightVector;
00033                         typedef WeightVector::iterator WeightIterator;
00034                         class CBooleanWeight:public CWeight
00035                         {
00036                         public:
00037                                 CBooleanWeight(CSearcher* pSearcher,CBooleanQuery* pQuery);
00038                                 virtual ~CBooleanWeight();
00039                         public:
00040                                 weight_t squaredWeight();
00041                                 void normalize(float fQueryNorm);
00042 
00043                                 weight_t getValue();
00044                         protected:
00045                                 CSearcher*              m_pSearcher;
00046                                 WeightVector    m_weights;
00047                                 weight_t                m_fWeight;
00048                         };
00049                 public:
00050                         CBooleanQuery(void);
00051                         CBooleanQuery(const CBooleanQuery& clone);
00052                         virtual ~CBooleanQuery(void);
00053                 public:                 
00060                         CQuery*         optimize(firtex::index::CIndexReader* pReader);
00061                         
00067                         CScorer*        scorer(CSearcher* pSearcher);
00068 
00073                         CQuery*         clone();                
00074 
00075                         int32_t         getClaouseCount(){return (int32_t)m_clauses.size();}
00076 
00082                         void    add(CQuery* query, const bool required, const bool prohibited);
00083                         void    add(CBooleanClause* pClause);
00084 
00085                         void    clear();
00086                 public:
00087                         static int      getMaxClauseCount();
00088                         static void setMaxClauseCount(int maxCount);
00089                 public:
00090                         static const char* getClassName(){return "BooleanQuery";}
00091                         const char* getQueryName() const{return getClassName();}
00092                 protected:
00093                         CWeight*        createWeight(CSearcher* pSearcher);
00094                 protected:
00095                         ClauseVector    m_clauses;
00096 
00097                         static int      maxClauseCount;
00098                         int                     m_minShouldMatch;
00099 
00100                         friend class CBooleanQuery::CBooleanWeight;
00101                 };
00102         }
00103 }
00104 
00105 
00106 #endif