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//# TableMeasOffsetDesc.cc: Definition of a offset measure in a Table.
//# Copyright (C) 1997,1998,1999,2000,2001
//# 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
//# Includes
#include <casacore/measures/TableMeasures/TableMeasOffsetDesc.h>
#include <casacore/measures/TableMeasures/TableMeasDescBase.h>
#include <casacore/measures/TableMeasures/TableMeasDesc.h>
#include <casacore/tables/Tables/Table.h>
#include <casacore/tables/Tables/TableRecord.h>
#include <casacore/casa/Exceptions.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
TableMeasOffsetDesc::TableMeasOffsetDesc (const TableMeasDescBase& column,
Bool asArray)
: itsTMDesc(column.clone()),
itsVarPerArr(asArray)
{}
TableMeasOffsetDesc::TableMeasOffsetDesc (const Measure& measure)
: itsTMDesc(0),
itsMeasure(measure),
itsVarPerArr(False)
{}
TableMeasOffsetDesc::TableMeasOffsetDesc (const TableMeasOffsetDesc& that)
: itsTMDesc(0)
{
*this = that;
}
TableMeasOffsetDesc::~TableMeasOffsetDesc()
{
delete itsTMDesc;
}
TableMeasOffsetDesc* TableMeasOffsetDesc::reconstruct(
const TableRecord& measInfo,
const String& prefix,
const Table& tab)
{
TableMeasOffsetDesc* p = 0;
if ((measInfo.fieldNumber(prefix + "Msr") >= 0)
|| (measInfo.fieldNumber(prefix + "Col") >= 0)) {
p = new TableMeasOffsetDesc(measInfo, prefix, tab);
}
return p;
}
TableMeasOffsetDesc::TableMeasOffsetDesc (const TableRecord& measInfo,
const String& prefix,
const Table& tab)
: itsTMDesc(0)
{
Int fnr;
fnr = measInfo.fieldNumber(prefix + "Msr");
if (fnr >= 0) {
// this is a non-variable offset. The offset is fully defined in the
// column keywords.
String error;
const TableRecord& measRec = measInfo.subRecord(fnr);
if (! itsMeasure.fromRecord (error, measRec)) {
throw(AipsError("TableMeasOffsetDesc::TableMeasOffsetDesc() " + error));
}
}
// offset stored in a a measure column
fnr = measInfo.fieldNumber(prefix + "Col");
if (fnr >= 0) {
itsVarColName = measInfo.asString(fnr);
itsTMDesc = TableMeasDescBase::reconstruct(tab, itsVarColName);
}
// offset stored per array element
fnr = measInfo.fieldNumber(prefix + "varPerArr");
if (fnr >= 0) {
itsVarPerArr = measInfo.asBool(fnr);
}
}
TableMeasOffsetDesc& TableMeasOffsetDesc::operator=
(const TableMeasOffsetDesc& that)
{
if (this != &that) {
delete itsTMDesc;
itsTMDesc = that.itsTMDesc;
itsMeasure = that.itsMeasure;
itsVarColName = that.itsVarColName;
itsVarPerArr = that.itsVarPerArr;
if (itsTMDesc != 0) {
itsTMDesc = itsTMDesc->clone();
}
}
return *this;
}
const Measure& TableMeasOffsetDesc::getOffset() const
{
if (isVariable()) {
throw (AipsError ("TableMeasOffsetDesc::getOffset() "
"attempt to reference undefined measure offset."));
}
return itsMeasure.asMeasure();
}
void TableMeasOffsetDesc::write (TableDesc& td, TableRecord& measInfo,
const String& prefix)
{
writeKeys (measInfo, prefix);
if (itsTMDesc != 0) {
itsTMDesc->write (td);
}
}
void TableMeasOffsetDesc::write (Table& tab, TableRecord& measInfo,
const String& prefix)
{
writeKeys (measInfo, prefix);
if (itsTMDesc != 0) {
itsTMDesc->write (tab);
}
}
void TableMeasOffsetDesc::writeKeys (TableRecord& measInfo,
const String& prefix)
{
if (! itsMeasure.isEmpty()) {
String error;
TableRecord measRec;
itsMeasure.toRecord (error, measRec);
measInfo.defineRecord (prefix + "Msr", measRec);
}
if (itsTMDesc != 0) {
measInfo.define (prefix + "Col", itsTMDesc->columnName());
measInfo.define (prefix + "varPerArr", itsVarPerArr);
}
}
void TableMeasOffsetDesc::resetOffset (const Measure& offset)
{
if (isVariable()) {
throw (AipsError ("tableMeasOffsetDesc::resetOffset cannot be done;"
"the offset is not fixed for the entire column"));
}
itsMeasure = MeasureHolder(offset);
}
} //# NAMESPACE CASACORE - END
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