108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
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/*
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1.1 ~OperatorCommon~
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This operator takes a relation name and checks whether there is a relation with
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this name in the local SECONDO system. Otherwise, it connects to the DBService
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and retrieves the type of the relation from there in case the relation exists.
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----
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This file is part of SECONDO.
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Copyright (C) 2017,
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Faculty of Mathematics and 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_DBSERVICE_OperatorCommon_HPP_
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#define ALGEBRAS_DBSERVICE_OperatorCommon_HPP_
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#include "Operator.h"
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namespace DBService {
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/*
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1.1.1 Class Definition
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*/
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class OperatorCommon
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{
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public:
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/*
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1.1.1.1 ~getStreamType~
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Returns the stream type if applying the feed operator
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to the relation specified in nextedList. The nestedList may
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contains either a full description of the relation type
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or just a symbol specifying the relation's name. In the second
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case, the type is retrieved from the DBService.
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Attention: The invoking function must acquire a lock to the nlparsemtx mutex.
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*/
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static ListExpr getStreamType(ListExpr nestedList, bool& locallyAvailable);
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/*
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1.1.1.1 ~getRelType~
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If nestedList is a correct decription of a relation type, this type is
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returned. Otherwise nestedList has to be a symbol contains the relation's
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name. In this case, the type is requested from the DBService.
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Attention: The invoking function must acquire a lock to the nlparsemtx mutex.
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*/
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static ListExpr getRelType(ListExpr nestedList, bool& locallyAvailable);
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/*
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1.1.1.1 ~getDerivedType~
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This operator returns the type of the X-th argument stored in the ~args~
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nested list. X must be greater than one. The first element in args
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must be the relation from that the argument is derived. ~args~ must be
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formatted as a list of arguments each having format (type expr) as
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created for type mappings if UsesArgsInTypeMapping is activated.
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Attention: The invoking function must acquire a lock to the nlparsemtx mutex.
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*/
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static ListExpr getDerivedType(ListExpr args, int X, bool & locallyAvailable);
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/*
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1.1.1.1 ~allExists~
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This Operator checks whether the relation and all derived objects are
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managed by the DBService at a single node.
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*/
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static bool allExists( const std::string& dbName,
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const std::string& relName,
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const std::vector<std::string>& derivates);
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};
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} /* namespace DBService */
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#endif /* ALGEBRAS_DBSERVICE_OPERATORREAD_HPP_ */
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