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//# DataManAccessor.h: Base class for the Data Manager Accessor classes
//# Copyright (C) 1996,1999
//# 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_DATAMANACCESSOR_H
#define TABLES_DATAMANACCESSOR_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/tables/DataMan/DataManager.h>
#include <iosfwd>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
// <summary>
// Base class for the Data Manager Accessor classes.
// </summary>
// <use visibility=local>
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="" demos="">
// </reviewed>
// <prerequisite>
//# Classes you should understand before using this one.
// <li> <linkto class=DataManager>DataManager</linkto>
// </prerequisite>
// <synopsis>
// The Table system has one or more data managers underneath.
// Once a table is constructed, these data managers are invisible
// and there is no way to get access to them.
// However, sometimes limited access to them is needed (e.g. to
// set the size of an internal cache).
// <p>
// This class should be used as the base class for specialized
// Data Manager Accessor classes (e.g. class
// <linkto class=ROIncrementalStManAccessor:description>
// ROIncrementalStManAccessor</linkto>.
// This base class provides the functionality to get the
// <src>DataManager</src> object for a given column.
// </synopsis>
// <motivation>
// This base class makes it possible that every derived class can get the
// data manager, because RODataManAccessor is a friend of class Table.
// Otherwise all accessor classes needed to be friend of Table.
// </motivation>
//# <todo asof="$DATE:$">
//# </todo>
class RODataManAccessor
{
public:
// Construct an empty object.
RODataManAccessor()
: itsDataManager(0)
{}
// Construct the accessor object for a data manager in the table.
// An exception is thrown if the name of the data manager or column is
// unknown.
RODataManAccessor (const Table& table, const String& name,
Bool byColumn);
virtual ~RODataManAccessor();
// Set data manager properties using the fields in the record.
// Each data manager has its specific set of properties.
void setProperties (const Record&) const;
// Get data manager properties as a record.
Record getProperties() const;
// Get the data manager type.
String dataManagerType() const
{ return itsDataManager->dataManagerType(); }
// Get the data manager name.
String dataManagerName() const
{ return itsDataManager->dataManagerName(); }
// Get the data manager sequence nr.
uInt dataManagerSeqNr() const
{ return itsDataManager->sequenceNr(); }
// Show IO statistics.
void showCacheStatistics (ostream& os) const
{ itsDataManager->showCacheStatistics (os); }
protected:
// Get the data manager for the given data manager or column name.
DataManager* baseDataManager() const
{ return itsDataManager; }
private:
DataManager* itsDataManager;
};
} //# NAMESPACE CASACORE - END
#endif
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