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Index Class Reference

Abstract Class for indexed document collection. More...

#include <Index.hpp>

Inheritance diagram for Index:

List of all members.

Public Methods
virtual	~Index ()
Open index
virtual bool	open (const char *indexName)=0
	Open previously created Index, return true if opened successfully, indexName should be the full name of the table-of-content file for the index. E.g., "index.bsc" for an index built with the basic indexer.
Spelling and index conversion
virtual int	term (const char *word)=0
	Convert a term spelling to a termID, returns 0 if out of vocabulary. Valid index starts at 1.
virtual const char*	term (int termID)=0
	Convert a valid termID to its spelling.
virtual int	document (const char *docIDStr)=0
	Convert a spelling to docID, returns 0 if out of vocabulary. Valid index starts at 1.
virtual const char*	document (int docID)=0
	Convert a valid docID to its spelling.
virtual const char*	termLexiconID ()
	Return a string ID for the term lexicon (usually the file name of the lexicon). More...
Summary counts
virtual int	docCount ()=0
	Total count (i.e., number) of documents in collection.
virtual int	termCountUnique ()=0
	Total count of unique terms in collection, i.e., the term vocabulary size.
virtual int	termCount (int termID)const=0
	Total counts of a term in collection.
virtual int	termCount ()const=0
	Total counts of all terms in collection.
virtual float	docLengthAvg ()=0
	Average document length.
virtual int	docCount (int termID)=0
	Total counts of doc with a given term.
virtual int	docLength (int docID)const=0
	Total counts of terms in a document.
Index entry access
virtual DocInfoList*	docInfoList (int termID)=0
	returns a new instance of DocInfoList which represents the doc entries in a term index, you must delete the instance later. See also: DocInfoList.
virtual TermInfoList*	termInfoList (int docID)=0
	returns a new instance of TermInfoList which represents the word entries in a document index, you must delete the instance later. See also: TermInfoList.

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Detailed Description

Abstract Class for indexed document collection.

This is an abstract class that provides a uniform interface for access to an indexed document collection. The following is an example of using it.

Index &myIndex;

myIndex.open("index-file");


int t1;
... 

// now fetch doc info list for term t1
// this returns a dynamic instance, so you'll need to delete it
DocInfoList *docList = myIndex.docInfoList(t1);

docList->startIteration();

DocInfo *entry;
while (docList->hasMore()) {
  entry = docList->nextEntry(); 
  // this returns a pointer to a *static* memory, do don't delete entry!
  
  cout << "entry doc id: "<< entry->docID() <<endl;
  cout << "entry term count: "<< entry->termCount() << endl;
}

delete docList;

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Constructor & Destructor Documentation

Index::~Index ( ) [inline, virtual]

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Member Function Documentation

int Index::docCount ( int termID ) [pure virtual]

Total counts of doc with a given term. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

int Index::docCount ( ) [pure virtual]

Total count (i.e., number) of documents in collection. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

DocInfoList * Index::docInfoList ( int termID ) [pure virtual]

returns a new instance of DocInfoList which represents the doc entries in a term index, you must delete the instance later. See also: DocInfoList. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

int Index::docLength ( int docID ) const [pure virtual]

Total counts of terms in a document. Reimplemented in BasicIndex, and BasicIndexWithCat.

float Index::docLengthAvg ( ) [pure virtual]

Average document length. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

const char * Index::document ( int docID ) [pure virtual]

Convert a valid docID to its spelling. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

int Index::document ( const char * docIDStr ) [pure virtual]

Convert a spelling to docID, returns 0 if out of vocabulary. Valid index starts at 1. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

bool Index::open ( const char * indexName ) [pure virtual]

Open previously created Index, return true if opened successfully, indexName should be the full name of the table-of-content file for the index. E.g., "index.bsc" for an index built with the basic indexer. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

const char * Index::term ( int termID ) [pure virtual]

Convert a valid termID to its spelling. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

int Index::term ( const char * word ) [pure virtual]

Convert a term spelling to a termID, returns 0 if out of vocabulary. Valid index starts at 1. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

int Index::termCount ( ) const [pure virtual]

Total counts of all terms in collection. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

int Index::termCount ( int termID ) const [pure virtual]

Total counts of a term in collection. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

int Index::termCountUnique ( ) [pure virtual]

Total count of unique terms in collection, i.e., the term vocabulary size. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

TermInfoList * Index::termInfoList ( int docID ) [pure virtual]

returns a new instance of TermInfoList which represents the word entries in a document index, you must delete the instance later. See also: TermInfoList. Reimplemented in BasicIndex, BasicIndexWithCat, and InvFPIndex.

const char * Index::termLexiconID ( ) [inline, virtual]

Return a string ID for the term lexicon (usually the file name of the lexicon). This function should be pure virtual; the default implementation is just for convenience. Appropriate implementation to be done in the future. Reimplemented in BasicIndex.

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The documentation for this class was generated from the following file:

• Index.hpp

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