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//# ExprUnitNode.cc: Nodes representing unit handling in table select expression tree
//# Copyright (C) 2006
//# 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: casa-feedback@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
#include <casacore/tables/TaQL/ExprUnitNode.h>
#include <casacore/tables/Tables/TableError.h>
#include <casacore/casa/Quanta/Quantum.h>
#include <casacore/tables/TaQL/MArray.h>
#include <casacore/casa/Arrays/ArrayMath.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
TableExprNodeUnit::TableExprNodeUnit (const TENShPtr& child,
const Unit& unit)
: TableExprNodeBinary (child->dataType(), *child, OtUndef)
{
// Units imply conversion, thus result cannot be integer.
if (dtype_p == NTInt) {
dtype_p = NTDouble;
}
lnode_p = child;
factor_p = set (*this, child, unit);
}
TableExprNodeUnit::~TableExprNodeUnit()
{}
Double TableExprNodeUnit::set (TableExprNodeRep& parent,
const TENShPtr& child,
const Unit& unit)
{
Double factor = 1;
if (unit.empty()) {
parent.setUnit (child->unit());
} else {
if (! child->unit().empty()) {
// Conversion is only possible between units of the same type
// and between time/angle.
UnitVal type1 = unit.getValue();
UnitVal type2 = child->unit().getValue();
if (! (type1 == type2
|| (type1 == UnitVal::ANGLE && type2 == UnitVal::TIME)
|| (type2 == UnitVal::ANGLE && type1 == UnitVal::TIME))) {
throw TableInvExpr ("Units " + unit.getName() + " and " +
child->unit().getName() + " do not conform");
}
// Get conversion factor.
Quantity q(1., child->unit());
factor = q.getValue (unit);
}
parent.setUnit (unit);
}
return factor;
}
TENShPtr TableExprNodeUnit::useUnit (const TENShPtr& node,
const Unit& unit)
{
// No conversion needed if a unit is empty.
// However, always set the node's unit to the new unit.
if (unit.empty() || node->unit().empty()) {
node->setUnit (unit);
return node;
}
// A conversion might be needed.
// A set has to create conversion nodes for its elements.
if (node->valueType() == VTSet || node->valueType() == VTSetElem) {
node->adaptSetUnits(unit);
return node;
}
// Create a unit conversion node for a scalar or array.
TENShPtr tsnptr;
if (node->valueType() == VTScalar) {
tsnptr = std::make_shared<TableExprNodeUnit>(node, unit);
} else {
tsnptr = std::make_shared<TableExprNodeArrayUnit>(node, unit);
}
if (tsnptr->getUnitFactor() == 1.) {
// Units are the same, so no conversion needed.
return node;
}
return tsnptr;
}
void TableExprNodeUnit::adaptUnit (TENShPtr& node,
const Unit& unit)
{
// See if a conversion is needed.
// If so, adapt the reference counts and replace it.
node = useUnit (node, unit);
}
Unit TableExprNodeUnit::adaptUnits (TENShPtr& node1,
TENShPtr& node2,
TENShPtr& node3)
{
// Find unit to be used.
Unit unit;
if (unit.empty() && node1) unit = node1->unit();
if (unit.empty() && node2) unit = node2->unit();
if (unit.empty() && node3) unit = node3->unit();
if (! unit.empty()) {
if (node1) adaptUnit (node1, unit);
if (node2) adaptUnit (node2, unit);
if (node3) adaptUnit (node3, unit);
}
return unit;
}
Double TableExprNodeUnit::getUnitFactor() const
{ return factor_p; }
Double TableExprNodeUnit::getDouble (const TableExprId& id)
{ return factor_p * lnode_p->getDouble(id); }
DComplex TableExprNodeUnit::getDComplex (const TableExprId& id)
{ return factor_p * lnode_p->getDComplex(id); }
TableExprNodeArrayUnit::TableExprNodeArrayUnit (const TENShPtr& child,
const Unit& unit)
: TableExprNodeArray (*child, child->dataType(), OtUndef)
{
// Units imply conversion, thus result cannot be integer.
if (dtype_p == NTInt) {
dtype_p = NTDouble;
}
lnode_p = child;
factor_p = TableExprNodeUnit::set (*this, child, unit);
}
TableExprNodeArrayUnit::~TableExprNodeArrayUnit()
{}
Double TableExprNodeArrayUnit::getUnitFactor() const
{ return factor_p; }
MArray<Double> TableExprNodeArrayUnit::getArrayDouble (const TableExprId& id)
{
MArray<Double> arr = lnode_p->getArrayDouble(id);
return MArray<Double> (factor_p * arr.array(), arr.mask());
}
MArray<DComplex> TableExprNodeArrayUnit::getArrayDComplex(const TableExprId& id)
{
MArray<DComplex> arr = lnode_p->getArrayDComplex(id);
return MArray<DComplex> (DComplex(factor_p) * arr.array(), arr.mask());
}
} //# NAMESPACE CASACORE - END
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