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//# TableSyncData.cc: Class to hold table synchronization data
//# Copyright (C) 1997,1999,2001,2005
//# 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
//#
//# $Id$
//# Includes
#include <casacore/tables/Tables/TableSyncData.h>
#include <casacore/tables/Tables/TableError.h>
#include <casacore/tables/DataMan/DataManager.h>
#include <casacore/casa/Containers/BlockIO.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
TableSyncData::TableSyncData()
: itsNrrow (0),
itsNrcolumn (-1),
itsModifyCounter (0),
itsTableChangeCounter (0)
{
itsAipsIO.open (&itsMemIO);
}
TableSyncData::~TableSyncData()
{
itsAipsIO.close();
}
void TableSyncData::write (rownr_t nrrow, uInt nrcolumn, Bool tableChanged,
const Block<Bool>& dataManChanged)
{
// Increment change counter when the table has changed.
Bool changed = False;
itsNrrow = nrrow;
itsNrcolumn = nrcolumn;
if (tableChanged) {
itsTableChangeCounter++;
changed = True;
}
// Increment a counter when a data manager has changed.
// Resize and initialize the block when needed.
uInt ndmOld = itsDataManChangeCounter.nelements();
uInt ndmNew = dataManChanged.nelements();
if (ndmNew != ndmOld) {
itsDataManChangeCounter.resize (ndmNew, True, True);
for (uInt i=ndmOld; i<ndmNew; i++) {
itsDataManChangeCounter[i] = 0;
}
}
for (uInt i=0; i<ndmNew; i++) {
if (dataManChanged[i]) {
itsDataManChangeCounter[i]++;
changed = True;
}
}
// Increment modify counter if anything has changed.
if (changed) {
itsModifyCounter++;
}
// Now write the data into the memoryIO object.
// Use 32-bit for the row number if it fits.
// First clear it.
itsMemIO.clear();
if (itsNrrow > DataManager::MAXROWNR32) {
itsAipsIO.putstart ("sync", 2);
itsAipsIO << itsNrrow;
} else {
itsAipsIO.putstart ("sync", 1);
itsAipsIO << uInt(itsNrrow);
}
itsAipsIO << itsNrcolumn;
itsAipsIO << itsModifyCounter;
if (itsNrcolumn >= 0) {
itsAipsIO << itsTableChangeCounter;
itsAipsIO << itsDataManChangeCounter;
}
itsAipsIO.putend();
}
void TableSyncData::write (rownr_t nrrow)
{
itsModifyCounter++;
itsNrrow = nrrow;
itsNrcolumn = -1;
// Now write the data into the memoryIO object.
// Use 32-bit for the row number if it fits.
// First clear it.
itsMemIO.clear();
if (itsNrrow > DataManager::MAXROWNR32) {
itsAipsIO.putstart ("sync", 2);
itsAipsIO << itsNrrow;
} else {
itsAipsIO.putstart ("sync", 1);
itsAipsIO << uInt(itsNrrow);
}
itsAipsIO << itsNrcolumn;
itsAipsIO << itsModifyCounter;
itsAipsIO.putend();
}
Bool TableSyncData::read (rownr_t& nrrow, uInt& nrcolumn, Bool& tableChanged,
Block<Bool>& dataManChanged)
{
// Read the data into the memoryIO object.
// When no columns, don't read the remaining part (then it is used
// by an external filler).
Int nrcol = -1;
if (itsMemIO.length() > 0) {
uint version = itsAipsIO.getstart ("sync");
if (version > 2) {
throw TableError ("TableSyncData version " + String::toString(version) +
" not supported by this version of Casacore");
}
if (version == 1) {
uInt n;
itsAipsIO >> n;
nrrow = n;
} else {
itsAipsIO >> nrrow;
}
itsAipsIO >> nrcol;
itsAipsIO >> itsModifyCounter;
}
if (nrcol < 0) {
tableChanged = True;
dataManChanged.set (True);
if (itsMemIO.length() > 0) {
itsAipsIO.getend();
return True; // not empty
}
nrcolumn = 0;
return False; // empty MemoryIO object
}
nrcolumn = nrcol;
// The table has changed when the change counter has changed.
uInt tableChangeCounter;
Block<uInt> dataManChangeCounter;
itsAipsIO >> tableChangeCounter;
itsAipsIO >> dataManChangeCounter;
itsAipsIO.getend();
tableChanged = (tableChangeCounter != itsTableChangeCounter);
itsTableChangeCounter = tableChangeCounter;
// A data manager has changed when its change counter has changed.
// Increment a change counter when a data manager has changed.
// Resize and initialize the array when needed.
uInt ndmOld = itsDataManChangeCounter.nelements();
uInt ndmNew = dataManChangeCounter.nelements();
dataManChanged.resize (ndmNew, True, False);
dataManChanged.set (False);
if (ndmNew != ndmOld) {
itsDataManChangeCounter.resize (ndmNew, True, True);
for (uInt i=ndmOld; i<ndmNew; i++) {
dataManChanged[i] = True;
itsDataManChangeCounter[i] = dataManChangeCounter[i];
}
}
for (uInt i=0; i<ndmNew; i++) {
if (dataManChangeCounter[i] != itsDataManChangeCounter[i]) {
dataManChanged[i] = True;
itsDataManChangeCounter[i] = dataManChangeCounter[i];
}
}
return True;
}
} //# NAMESPACE CASACORE - END
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