ExprFuncNodeArray.h

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//# ExprFuncNodeArray.h: Class representing an array function in table select expression
//# Copyright (C) 2001,2003
//# 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
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//# 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.
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//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
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//# $Id: ExprFuncNodeArray.h 21168 2012-01-04 08:11:03Z gervandiepen $

#ifndef TABLES_EXPRFUNCNODEARRAY_H
#define TABLES_EXPRFUNCNODEARRAY_H

//# Includes
#include <tables/Tables/ExprNodeArray.h>
#include <tables/Tables/ExprFuncNode.h>

namespace casa { //# NAMESPACE CASA - BEGIN

//# Forward Declarations


// <summary>
// Class representing an array function in table select expression
// </summary>

// <use visibility=local>

// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="">
// </reviewed>
// <prerequisite>
//# Classes you should understand before using this one.
//   <li> <linkto class=TableExprFuncNode>TableExprFuncNode</linkto>
//   <li> <linkto class=TableExprNodeArray>TableExprNodeArray</linkto>
// </prerequisite>

// <synopsis> 
// This class can be seen as a specialization of TableExprFuncNode
// for functions returning arrays.
// However, it is derived from TableExprNodeArray to make it possible
// that the ExprNode classes use all array functionality offered by
// that base class.
// <br>Internally an TableExprFuncNode object is used.
// <p>
// When a TaQL function is used, TableExprFuncNode::checkOperands
// determines whether the result is a scalar or an array.
// Thereafter TableExprNode::newFunctionNode creates a TableExprFuncNode
// for scalars or a TableExprFuncNodeArray for arrays.
// </synopsis> 


class TableExprFuncNodeArray : public TableExprNodeArray
{
public:
    // Constructor
    TableExprFuncNodeArray (TableExprFuncNode::FunctionType,
                            NodeDataType, ValueType,
                            const TableExprNodeSet& source,
                            const TaQLStyle&);

    // Destructor
    ~TableExprFuncNodeArray();

    // 'get' Functions to get the desired result of a function
    // <group>
    virtual Array<Bool> getArrayBool (const TableExprId& id);
    virtual Array<Int64> getArrayInt (const TableExprId& id);
    virtual Array<Double> getArrayDouble (const TableExprId& id);
    virtual Array<DComplex> getArrayDComplex (const TableExprId& id);
    virtual Array<String> getArrayString (const TableExprId& id);
    virtual Array<MVTime> getArrayDate (const TableExprId& id);
    // </group>

    // Get the function node.
    const TableExprFuncNode* getChild() const
      { return &node_p; }

    // Link the children to the node and convert the children
    // to constants if possible. Also convert the node to
    // constant if possible.
    static TableExprNodeRep* fillNode (TableExprFuncNodeArray* thisNode,
                                       PtrBlock<TableExprNodeRep*>& nodes,
                                       const Block<Int>& dtypeOper);

private:
    // Try if the function gives a constant result.
    // If so, set the expression type to Constant.
    void tryToConst();

    // Some functions to be used by TableExprNodeFuncArray.
    // <group>
    const PtrBlock<TableExprNodeRep*>& operands() const
        { return node_p.operands(); }
    PtrBlock<TableExprNodeRep*>& rwOperands()
        { return node_p.rwOperands(); }
    TableExprFuncNode::FunctionType funcType() const
        { return node_p.funcType(); }
    NodeDataType argDataType() const
        { return node_p.argDataType(); }
    // </group>

    // Set unit scale factor (needed for sqrt).
    void setScale (Double scale)
        { node_p.setScale (scale); }

    // Get the collapse axes for the partial functions.
    // It compares the values with the #dim and removes them if too high.
    // axarg gives the argument nr of the axes.
    IPosition getAxes (const TableExprId& id,
                       Int ndim, uInt axarg=1, Bool swapRemove=True);

    // Remove axes exceeding ndim.
    IPosition removeAxes (const IPosition& axes, Int ndim) const;

    // Get the shape for the array function.
    // axarg gives the argument nr of the shape.
    const IPosition& getArrayShape (const TableExprId& id, uInt axarg=1);

    // Get the transpose order of the array axes.
    IPosition getOrder (const TableExprId& id, Int ndim);

    TableExprFuncNode node_p;
    Int               origin_p;        //# axes origin
    Bool              isCOrder_p;      //# axes order
    Bool              constAxes_p;     //# True = collapse axes are constant
    IPosition         ipos_p;          //# the (maybe constant) axes or shape
    IPosition         iposN_p;         //# the non-reversed axes or shape
};




} //# NAMESPACE CASA - END

#endif