/usr/include/casacore/tables/TaQL/ExprRange.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | //# ExprRange.h: Select range of a column in an select expression
//# Copyright (C) 1994,1995,1999
//# 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_EXPRRANGE_H
#define TABLES_EXPRRANGE_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/casa/Arrays/Vector.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward Declarations
class TableColumn;
// <summary>
// Select range of a column in an 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> TableExprNode
// </prerequisite>
// <etymology>
// TableExprRange represents the ranges of a column as specified in
// a table select expression.
// </etymology>
// <synopsis>
// TableExprRange holds the ranges of values for a column as specified
// in a table select expression.
// It traverses the expression tree and composes the hull of the values.
// Only double values are taken into account.
// It can handle operators &&, ||, ==, >, >=, <, <=, !.
// It can handle a comparison operator only for a column with a constant.
// Other operators and expressions are non-convertable.
//
// The ranges function in class TableExprNode returns a Block
// of TableExprRange objects which contains the ranges for each
// (applicable) column used in the expression.
// </synopsis>
// <motivation>
// TableExprRange gives great possibilities in optimizing a table
// selection. It allows to get a rough estimate of the values needed
// for a column which can be used to do a fast preselect using an index.
// </motivation>
// <todo asof="$DATE:$">
//# A List of bugs, limitations, extensions or planned refinements.
// <li> Support other data types than double
// <li> Recognize that 2*COL<3 is equal to COL<3/2
// </todo>
class TableExprRange
{
public:
// Default constructor (needed for Block<TableExprRange>).
TableExprRange();
// Construct from a column and a single constant range.
TableExprRange (const TableColumn&, double stval, double endval);
// Copy constructor.
TableExprRange (const TableExprRange&);
~TableExprRange ();
// Assignment operator (copy semantics).
TableExprRange& operator= (const TableExprRange&);
// Return the vector of start values.
// Together with the equally sized vector of end values, this forms
// the ranges for the column (which can be acquired using getColumn).
const Vector<double>& start() const;
// Return the vector of end values.
// Together with the equally sized vector of start values, this forms
// the ranges for the column (which can be acquired using getColumn).
const Vector<double>& end() const;
// Return the column object.
const TableColumn& getColumn() const;
//*display 4
// Mix with another range for an AND expression.
void mixAnd (const TableExprRange&);
//*display 4
// Mix with another range for an OR expression.
void mixOr (const TableExprRange&);
private:
Vector<double> sval_p; //# start values
Vector<double> eval_p; //# end values
TableColumn* tabColPtr_p; //# pointer to column
};
inline const Vector<double>& TableExprRange::start() const
{ return sval_p; }
inline const Vector<double>& TableExprRange::end() const
{ return eval_p; }
} //# NAMESPACE CASACORE - END
#endif
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