/usr/include/casacore/tables/TaQL/ExprUDFNode.h is in casacore-dev 2.2.0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | //# ExprUDFNode.h: Class representing a scalar UDF in select expression
//# Copyright (C) 2010
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//# $Id$
#ifndef TABLES_EXPRUDFNODE_H
#define TABLES_EXPRUDFNODE_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/tables/TaQL/ExprNodeRep.h>
#include <casacore/tables/TaQL/UDFBase.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward Declarations
class TableExprNodeSet;
// <summary>
// Class representing a scalar UDF in select expression
// </summary>
// <use visibility=local>
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="">
// </reviewed>
// <prerequisite>
//# Classes you should understand before using this one.
// <li> <linkto class=TableExprNodeMulti>TableExprNodeMulti</linkto>
// </prerequisite>
// <synopsis>
// This class represents a function in a table select tree.
// The <src>rownumber</src> function is represented by class
// <linkto class=TableExprNodeRownr>TableExprNodeRownr</linkto>.
// The <src>rowid</src> function is represented by class
// <linkto class=TableExprNodeRowid>TableExprNodeRowid</linkto>.
// The <src>rand</src> function is represented by class
// <linkto class=TableExprNodeRandom>TableExprNodeRandom</linkto>.
// <p>
// When one wants to add a function to the table selection grammar,
// the following has to be done:
// <ul>
// <li> Add the function to the enum below.
// <li> Implement the function in the get functions in ExprFuncNode(Array).cc.
// <li> Implement the function in the checkOperands in ExprFuncNode.cc.
// <li> Declare and define the function in ExprNode.h (for C++ binding).
// <li> Add the function to findFunc in TableParse.cc (for TaQL).
// </ul>
// </synopsis>
class TableExprUDFNode: public TableExprNodeMulti
{
public:
// Constructor
TableExprUDFNode (UDFBase* udf, const Table&,
const TableExprNodeSet& source);
// Destructor
virtual ~TableExprUDFNode();
// Is the UDF an aggregate function?
Bool isAggregate() const
{ return itsUDF->isAggregate(); }
// Get the nodes representing an aggregate function.
virtual void getAggrNodes (vector<TableExprNodeRep*>& aggr);
// Get the nodes representing a table column.
virtual void getColumnNodes (vector<TableExprNodeRep*>& cols);
// Do not apply the selection.
virtual void disableApplySelection();
// If needed, let the UDF re-create column objects for a selection of rows.
// It calls the function recreateColumnObjects.
virtual void applySelection (const Vector<uInt>& rownrs);
// UDFs do not need a TableExprGroupFuncBase,
// so TableExprGroupNull is returned.
CountedPtr<TableExprGroupFuncBase> makeGroupAggrFunc();
// Functions to get the desired result of a function
// <group>
virtual Bool getBool (const TableExprId& id);
virtual Int64 getInt (const TableExprId& id);
virtual Double getDouble (const TableExprId& id);
virtual DComplex getDComplex (const TableExprId& id);
virtual String getString (const TableExprId& id);
virtual TaqlRegex getRegex (const TableExprId& id);
virtual MVTime getDate (const TableExprId& id);
// </group>
private:
UDFBase* itsUDF;
};
} //# NAMESPACE CASACORE - END
#endif
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