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//# dVACEngine.h: Example virtual column engine to handle data type A
//# Copyright (C) 1994,1995,1996,2001
//# 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
#ifndef TABLES_DVACENGINE_H
#define TABLES_DVACENGINE_H
//# Includes
#include <casacore/tables/DataMan/VACEngine.h>
#include <casacore/tables/Tables/ArrayColumn.h>
#include <casacore/casa/namespace.h>
class VACExample
{
public:
VACExample(): x_p(0), y_p(0) {}
VACExample(Int x, float y, const String& z) : x_p(x), y_p(y), z_p(z) {}
static String dataTypeId()
{ return "VACExample"; }
Int x() const
{ return x_p; }
float y() const
{ return y_p; }
const String& z() const
{ return z_p; }
Int& x()
{ return x_p; }
float& y()
{ return y_p; }
String& z()
{ return z_p; }
int operator== (const VACExample& that) const
{ return x_p==that.x_p && y_p==that.y_p && z_p==that.z_p; }
int operator< (const VACExample& that) const
{ return x_p<that.x_p || (x_p==that.x_p && y_p<that.y_p) ||
(x_p==that.x_p && y_p==that.y_p && z_p<that.z_p); }
private:
Int x_p;
float y_p;
String z_p;
};
// <summary>
// Example virtual column engine to handle data type VACExample
// </summary>
// <use visibility=export>
// <reviewed reviewer="GvD" date="2004/07/09" tests="">
// <prerequisite>
//# Classes you should understand before using this one.
// <li> VirtualColumnEngine
// <li> VirtualArrayColumn
// </prerequisite>
// <synopsis>
// VACExampleVACEngine is an example showing how to use the templated
// class VACEngine to handle table data with an arbitrary type.
// Data of columns with the standard data types can directly be
// stored using a storage manager, but data of column with non-standard
// types have to be stored in another way.
//
// The normal way of doing this is to split the object of the non-standard
// type into its elementary types.
// This eample uses the class VACExample as the data type to be handled.
// It consists of 2 data fields, which will transparently be stored in
// 2 separate columns.
// </synopsis>
class VACExampleVACEngine : public VACEngine<VACExample>
{
public:
// The default constructor is required for reconstruction of the
// engine when a table is read back.
// It is also used to construct an engine, which does not check
// the source column name.
VACExampleVACEngine();
// Construct the engine for the given source column and storing
// the result in the given target columns for the data members
// x and y of class VACExample.
VACExampleVACEngine (const String& sourceColumnName,
const String& xTargetColumnName,
const String& yTargetColumnname,
const String& zTargetColumnname);
// Destructor is mandatory.
virtual ~VACExampleVACEngine();
// Assignment is not needed and therefore forbidden.
VACExampleVACEngine& operator= (const VACExampleVACEngine&) = delete;
// Clone the object.
DataManager* clone() const;
// Store the target column names in the source column keywords.
virtual void create64 (rownr_t);
// Prepare the engine by allocating column objects
// for the target columns.
virtual void prepare();
virtual void setShape (rownr_t rownr, const IPosition& shape);
virtual Bool isShapeDefined (rownr_t rownr);
virtual IPosition shape (rownr_t rownr);
// Get the data from a row.
virtual void getArray (rownr_t rownr, Array<VACExample>& value);
// Put the data in a row.
virtual void putArray (rownr_t rownr, const Array<VACExample>& value);
// Register the class name and the static makeObject "constructor".
// This will make the engine known to the table system.
static void registerClass();
private:
// Copy constructor is only used by clone().
// (so it is made private).
VACExampleVACEngine (const VACExampleVACEngine&);
// The target column names.
String xTargetName_p;
String yTargetName_p;
String zTargetName_p;
// Objects for the target columns.
ArrayColumn<Int> colx;
ArrayColumn<float> coly;
ArrayColumn<String> colz;
public:
//*display 4
// Define the "constructor" to construct this engine when a
// table is read back.
// This "constructor" has to be registered by the user of the engine.
static DataManager* makeObject (const String& dataManagerName,
const Record& spec);
};
#endif
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