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LineCollapser.h
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//# LineCollapser.h: Abstract base class to collapse lines for LatticeApply
//# Copyright (C) 1996,1997,1998
//# 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 LATTICES_LINECOLLAPSER_H
#define LATTICES_LINECOLLAPSER_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/casa/Arrays/ArrayFwd.h>
#include <casacore/scimath/Mathematics/NumericTraits.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward Declarations
class IPosition;
// <summary>
// Abstract base class for LatticeApply function signatures
// </summary>
// <use visibility=export>
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
// <prerequisite>
// <li> <linkto class=LatticeApply>LatticeApply</linkto>
// </prerequisite>
// <etymology>
// </etymology>
// <synopsis>
// This is an abstract base class for the collapsing of lines to
// be used in function <src>lineApply</src> or <src>lineMultiApply</src>
// in class <linkto class=LatticeApply>LatticeApply</linkto>.
// It is meant for cases where the entire line is needed (e.g. moment
// calculation). If that is not needed (e.g. to calculate maximum),
// it is better to use function <src>LatticeApply::tiledApply</src>
// with class <linkto class=TiledCollapser>TiledCollapser</linkto>.
// <p>
// The user has to derive a concrete class from this base class
// and implement the (pure) virtual functions.
// <br> The main function is <src>process</src>, which needs to do the
// calculation.
// <br> Other functions make it possible to perform an initial check.
// <p>
// The class is Doubly templated. Ths first template type
// is for the data type you are processing. The second type is
// for what type you want the results of the processing assigned to.
// For example, if you are computing sums of squares for statistical
// purposes, you might use higher precision (FLoat->Double) for this.
// No check is made that the template types are self-consistent.
// </synopsis>
// <example>
// <srcblock>
// </srcblock>
// </example>
// <motivation>
// </motivation>
// <todo asof="1997/08/01">
// <li>
// </todo>
template <class T, class U=T> class LineCollapser
{
public:
// Destructor
virtual ~LineCollapser();
// The init function for a derived class.
// It can be used to check if <src>nOutPixelsPerCollapse</src>
// corresponds with the number of pixels produced per collapsed line.
virtual void init (uInt nOutPixelsPerCollapse) = 0;
// Can the process function in the derived class handle a null mask?
// If not, LatticeApply ensures that it'll always pass a filled mask vector,
// even if the lattice does not have a mask (in that case that mask
// contains all True values).
// <br>The default implementation returns False.
// <br>The function is there to make optimization possible when no masks
// are involved. On the other side, it allows the casual user to ignore
// optimization.
virtual Bool canHandleNullMask() const;
// Collapse the given line and return one value from that operation.
// The position in the Lattice at the start of the line is input
// as well.
// <br>When function <src>canHandleNullMask</src> returned True,
// it is possible that <src>mask</src> is an empty vector indicating
// that the input has no mask, thus all values are valid.
// If not empty, the mask has the same length as the line.
virtual void process (U& result, Bool& resultMask,
const Vector<T>& line,
const Vector<Bool>& mask,
const IPosition& pos) = 0;
// Collapse the given line and return a line of values from that operation.
// The position in the Lattice at the start of the line is input
// as well.
// <br>When function <src>canHandleNullMask</src> returned True,
// it is possible that <src>mask</src> is an empty vector indicating
// that the input has no mask, thus all values are valid.
// If not empty, the mask has the same length as the line.
virtual void multiProcess (Vector<U>& result, Vector<Bool>& resultMask,
const Vector<T>& line,
const Vector<Bool>& mask,
const IPosition& pos) = 0;
};
} //# NAMESPACE CASACORE - END
#ifndef CASACORE_NO_AUTO_TEMPLATES
#include <casacore/lattices/LatticeMath/LineCollapser.tcc>
#endif //# CASACORE_NO_AUTO_TEMPLATES
#endif
casacore::IPosition
Definition IPosition.h:117
casacore::LineCollapser
Definition LineCollapser.h:92
casacore::LineCollapser::canHandleNullMask
virtual Bool canHandleNullMask() const
Can the process function in the derived class handle a null mask?
casacore::LineCollapser::~LineCollapser
virtual ~LineCollapser()
Destructor.
casacore::LineCollapser::process
virtual void process(U &result, Bool &resultMask, const Vector< T > &line, const Vector< Bool > &mask, const IPosition &pos)=0
Collapse the given line and return one value from that operation.
casacore::LineCollapser::init
virtual void init(uInt nOutPixelsPerCollapse)=0
The init function for a derived class.
casacore::LineCollapser::multiProcess
virtual void multiProcess(Vector< U > &result, Vector< Bool > &resultMask, const Vector< T > &line, const Vector< Bool > &mask, const IPosition &pos)=0
Collapse the given line and return a line of values from that operation.
casacore::Vector
Definition Vector.h:82
casacore
this file contains all the compiler specific defines
Definition mainpage.dox:28
casacore::uInt
unsigned int uInt
Definition aipstype.h:49
casacore::mask
LatticeExprNode mask(const LatticeExprNode &expr)
This function returns the mask of the given expression.
casacore::Bool
bool Bool
Define the standard types used by Casacore.
Definition aipstype.h:40