91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
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/*
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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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*/
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#ifndef ALGEBRAS_NESTEDRELATION2_NR2AHELPER_H_
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#define ALGEBRAS_NESTEDRELATION2_NR2AHELPER_H_
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#include <string>
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#include "Algebra.h"
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namespace nr2a {
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/*
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Some methods used by various classes inside the algebra are gathered in this
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class for general access.
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*/
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class Nr2aHelper
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{
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public:
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static ListExpr TupleStreamOf(ListExpr attributesTypes);
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static ListExpr TupleOf(ListExpr attributesTypes);
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static ListExpr RecordOf(ListExpr attributesTypes);
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static bool IsNestedRelation(const ListExpr definition);
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static bool IsNumericRepresentationOf(const ListExpr list,
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const std::string typeName);
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static int DefaultSelect(const ListExpr type);
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static std::string IntToString(const int num);
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static double MillisecondsElapsedSince(clock_t previousClock);
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};
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/*
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To simplify building larger structures in nested lists format the class
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"ListBuilder"[2] provides an easy interface to create such step by step.
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After defining the content the class' getters can be used to create several
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types containing the content as subtypes.
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*/
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class ListBuilder
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{
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public:
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ListBuilder();
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void Append(const ListExpr newElement);
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void AppendAttribute(const std::string attributeName,
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const ListExpr type);
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void AppendAttribute(const std::string attributeName,
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const std::string typeName);
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ListExpr GetList() const;
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ListExpr GetTuple() const;
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ListExpr GetRecord() const;
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ListExpr GetARel() const;
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ListExpr GetNRel() const;
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ListExpr GetTupleStream() const;
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private:
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ListExpr m_list;
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ListExpr m_end;
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};
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} /* namespace nr2a*/
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#endif /* ALGEBRAS_NESTEDRELATION2_NR2AHELPER_H_*/
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