102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//paragraph [10] title: [{\Large \bf ] [}]
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//paragraph [11] title: [{\large \bf ] [}]
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//paragraph [12] title: [{\normalsize \bf ] [}]
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//paragraph [21] table1column: [\begin{quote}\begin{tabular}{l}] [\end{tabular}\end{quote}]
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//paragraph [22] table2columns: [\begin{quote}\begin{tabular}{ll}] [\end{tabular}\end{quote}]
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//paragraph [23] table3columns: [\begin{quote}\begin{tabular}{lll}] [\end{tabular}\end{quote}]
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//paragraph [24] table4columns: [\begin{quote}\begin{tabular}{llll}] [\end{tabular}\end{quote}]
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//[--------] [\hline]
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//characters [1] verbatim: [$] [$]
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//characters [2] formula: [$] [$]
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//characters [3] capital: [\textsc{] [}]
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//characters [4] teletype: [\texttt{] [}]
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//[ae] [\"a]
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//[oe] [\"o]
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//[ue] [\"u]
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//[ss] [{\ss}]
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//[<=] [\leq]
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//[#] [\neq]
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//[tilde] [\verb|~|]
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1 Header File: IndexableAttribute
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May 1998 Stefan Dieker
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December 1998 Friedhelm Becker
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April 2002 Ulrich Telle Adjustments for the new Secondo version
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1 Class ~IndexableAttribute~
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*/
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#ifndef INDEXABLEATTRIBUTE_H
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#define INDEXABLEATTRIBUTE_H
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#include "Attribute.h"
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/*
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2 Class ~IndexableAttribute~
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This class is intended to be used for data types that need to be indexed by B-Trees.
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The standard types such as ~int~, ~string~, and ~real~ are directly supported. For
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the other (more complex) data types, they need to be converted to a string
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(char pointer) and then indexed. The string representation of the objects should
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preserve the ordering. These data types must also belong to the kind ~INDEXABLE~.
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For an example, see the ~DateTime~ algebra.
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*/
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class IndexableAttribute : public Attribute
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{
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public:
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IndexableAttribute() {}
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IndexableAttribute(const bool defined): Attribute(defined){}
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virtual void WriteTo( char *dest ) const = 0;
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/*
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This function writes the object value to a string ~dest~.
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*/
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virtual void ReadFrom( const char *src ) = 0;
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/*
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This function reads the object value from a string ~src~.
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*/
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virtual SmiSize SizeOfChars() const = 0;
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/*
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This function returns the number of bytes of the object's string representation.
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*/
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};
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#endif
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