TermScorer.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      : 2005/12/28
00013 //
00014 #ifndef _TERMSCORER_H
00015 #define _TERMSCORER_H
00016 
00017 
00018 #include "Scorer.h"
00019 #include "../index/TermDocs.h"
00020 #include "../index/NormBytes.h"
00021 
00022 using namespace firtex::index;
00023 
00024 namespace firtex
00025 {
00026         namespace search
00027         {
00028 #define TERMSCORE_CACHESIZE     1024
00029                 class CWeight;
00030                 class CSearcher;                
00031                 class CSimilarity;              
00032                 class CTermScorer :     public CScorer
00033                 {
00034                 public:
00035                         CTermScorer(CWeight* pWeight,CTermDocs* pTermDocs,CSimilarity* pSimilarity,CNormBytes* norms);
00036                         virtual ~CTermScorer(void);
00037                 public:                 
00038 
00043                         count_t nextDocs();
00044 
00051                         count_t scores(docid_t*& docs,score_t*& scores);
00052 
00060                         bool    skipTo(docid_t target,docid_t& nearTarget);
00061 
00066                         bool    next();
00067 
00068                         /*
00069                          * 返回当前位置文档的打分结果，必须配合{@link skipTo(docid_t,DOC_ID)}或{@link next()}使用，只有返回true后才有效
00070                          */
00071                         score_t score();
00072 
00073                         /*
00074                          * 返回当前位置文档ID，必须配合{@link skipTo(docid_t,DOC_ID)}或{@link next()}使用，只有返回true后才有效
00075                          */
00076                         docid_t doc();
00077                 protected:
00078                         CWeight*                m_pWeight;
00079                         CTermDocs*              m_pTermDocs;
00080 
00081                         score_t                 m_fWeights;
00082                         docid_t*                m_docs;                 //多个文档ID，内存由CTermDocs维护，调用nextDocs()时使用
00083                         freq_t*                 m_freqs;                //多个词频，内存由CTermDocs维护，调用nextDocs()时使用
00084                         count_t                 m_numDocs;              //文档数
00085 
00086                         docid_t                 m_doc;                  //单个文档ID，调用skipTo()时使用
00087                         freq_t                  m_freq;                 //单个词频，调用skipTo()时使用
00088 
00089                         score_t*                m_scores;               //打分结果
00090                         count_t                 m_pointer;              //m_scores数组访问指针
00091                         count_t                 m_pointerMax;   //m_scores数组大小
00092 
00093                         score_t                 m_scoreCache[TERMSCORE_CACHESIZE];      //Score Cache
00094                         CNormBytes*             m_norms;
00095                 };
00096         }
00097 }
00098 
00099 #endif