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VocabularyIterator.hpp

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00001 /*==========================================================================
00002  * Copyright (c) 2004 University of Massachusetts.  All Rights Reserved.
00003  *
00004  * Use of the Lemur Toolkit for Language Modeling and Information Retrieval
00005  * is subject to the terms of the software license set forth in the LICENSE
00006  * file included with this software, and also available at
00007  * http://www.lemurproject.org/license.html
00008  *
00009  *==========================================================================
00010  */
00011 
00012 //
00013 // VocabularyIterator
00014 //
00015 // 23 November 2004 -- tds
00016 //
00017 
00018 #ifndef INDRI_VOCABULARYITERATOR_HPP
00019 #define INDRI_VOCABULARYITERATOR_HPP
00020 
00021 #include "indri/TermData.hpp"
00022 #include "indri/DiskTermData.hpp"
00023 
00024 namespace indri {
00025   namespace index { 
00026     class VocabularyIterator {
00027     public:
00028       virtual ~VocabularyIterator() {};
00029       
00030       virtual void startIteration() = 0;
00031       virtual bool finished() = 0;
00032       virtual bool nextEntry() = 0;
00033       virtual bool nextEntry(const char *skipTo) = 0;
00034                         
00035       virtual bool nextEntry(std::string skipTo) {
00036         return nextEntry(skipTo.c_str());
00037       }
00038 
00039       virtual DiskTermData* currentEntry() = 0;
00040     };
00041   }
00042 }
00043     
00044 #endif // INDRI_VOCABULARYITERATOR_HPP
00045 
00046 
00047 

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