/usr/include/casacore/meas/MeasUDF/EpochEngine.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | //# EpochEngine.h: Engine for TaQL UDF Epoch conversions
//# Copyright (C) 2011
//# 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 MEAS_EPOCHENGINE_H
#define MEAS_EPOCHENGINE_H
//# Includes
#include <casacore/casa/aips.h>
#include<casacore/meas/MeasUDF/PositionEngine.h>
#include <casacore/tables/TaQL/ExprNode.h>
#include <casacore/measures/Measures/MEpoch.h>
#include <casacore/measures/Measures/MCEpoch.h>
#include <casacore/measures/Measures/MeasConvert.h>
#include <casacore/measures/TableMeasures/ScalarMeasColumn.h>
#include <casacore/measures/TableMeasures/ArrayMeasColumn.h>
namespace casacore {
// <summary>
// Engine for TaQL UDF Epoch conversions
// </summary>
// <use visibility=export>
// <reviewed reviewer="" date="" tests="tMeas.cc">
// </reviewed>
// <prerequisite>
//# Classes you should understand before using this one.
// <li> EngineBase
// </prerequisite>
// <synopsis>
// EpochEngine defines Engines (user defined functions) that can be used in TaQL
// to convert Measures for epochs.
// In this way such derived values appear to be ordinary TaQL functions.
//
// In TaQL these functions can be called like:
// <srcblock>
// meas.epoch (toref, time, fromref)
// meas.last (time, fromref, pos, posref)
// For example,
// meas.epoch ('UTC', 1e9 s, 'WGS84')
// </srcblock>
// <ul>
// <li>
// <src>toref</src> is a single constant string.
// <li>
// <src>pos</src> can have various value types. A single numeric array is
// a series of RA,DEC in J2000. If given as a set, the last argument of the
// set can be the reference types of the values in the set. The values can
// be strings (indicating planetary objects) or value pairs giving lon,lat.
// The default reference type is J2000.
// </ul>
// All functions have data type double and unit radian.
// A epoch can also be a table column which usually knows its type.
// It can also be an expression (e.g. EPOCH[0,]) which also knows the type.
// </synopsis>
// <motivation>
// It makes it possible to handle measures in TaQL.
// </motivation>
class EpochEngine
{
public:
EpochEngine();
// Get the reference type.
MEpoch::Types refType() const
{ return itsRefType; }
// Tell if the fraction has to be used for sidereal times.
Bool sidFrac() const
{ return itsSidFrac; }
// Get the shape.
const IPosition& shape() const
{ return itsShape; }
// Get the dimensionality.
Int ndim() const
{ return itsNDim; }
// Tell if the expression is constant.
Bool isConstant() const;
// Get the unit.
const Unit& unit() const
{ return itsUnit; }
// Get the values.
Array<Double> getArrayDouble (const TableExprId& id);
// Get the epochs.
Array<MEpoch> getEpochs (const TableExprId& id);
// Handle the argument(s) giving the input epochs and reference type.
// The epoch can be a column in a table.
void handleEpoch (PtrBlock<TableExprNodeRep*>& args,
uInt& argnr);
// Handle a epoch reference type.
// If the reference type is invalid, an exception is only thrown
// if <src>doThrow=True</src>. In this way a string argument can
// be an observatory name for a position.
Bool handleEpochType (TableExprNodeRep* operand, Bool doThrow);
// Set the MeasConvert object.
void setConverter (MEpoch::Types toType, Bool sidFrac);
// Set the possible position engine.
// It can be done only once.
void setPositionEngine (PositionEngine& engine);
private:
void handleEpochArray (TableExprNodeRep* operand);
void handleConstant (TableExprNodeRep* operand);
//# Data members.
IPosition itsShape;
Int itsNDim;
Unit itsUnit;
Bool itsSidFrac; //# T = fraction for sidereal
MeasFrame itsFrame; //# frame used by converter
MEpoch::Convert itsConverter;
Vector<MEpoch> itsConstants;
MEpoch::Types itsRefType;
TableExprNode itsExprNode;
ScalarMeasColumn<MEpoch> itsMeasScaCol;
ArrayMeasColumn<MEpoch> itsMeasArrCol;
PositionEngine* itsPositionEngine;
};
} //end namespace
#endif
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