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#ifndef _STEMDB_H_INCLUDED_

#define _STEMDB_H_INCLUDED_

/* @(#$Id: stemdb.h,v 1.1 2006-04-13 09:50:03 dockes Exp $  (C) 2004 J.F.Dockes */

#ifdef RCLDB_INTERNAL

/// Stem database code

/// 

/// Stem databases list stems and the set of index terms they expand to. They 

/// are computed from index data by stemming each term and regrouping those 

/// that stem to the same value.

/// Stem databases are stored as separate xapian databases (used as an 

/// Isam method), in subdirectories of the index.



#include <list>

#include <string>



#include <xapian.h>



namespace Rcl {

namespace StemDb {



/// Get languages of existing stem databases

extern std::list<std::string> getLangs(const std::string& dbdir);

/// Delete stem database for given language

extern bool deleteDb(const std::string& dbdir, const std::string& lang);

/// Create stem database for given language

extern bool createDb(Xapian::Database& xdb, 

		     const std::string& dbdir, const std::string& lang);

/// Expand term to stem siblings

extern std::list<std::string> stemExpand(const std::string& dbdir, 

					 const std::string& lang,

					 const std::string& term);



}

}



#endif // RCLDB_INTERNAL

#endif /* _STEMDB_H_INCLUDED_ */