ExprConeNode.h

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00001 //# ExprConeNode.h: Class representing a cone search in table select expression
00002 //# Copyright (C) 2005
00003 //# Associated Universities, Inc. Washington DC, USA.
00004 //#
00005 //# This library is free software; you can redistribute it and/or modify it
00006 //# under the terms of the GNU Library General Public License as published by
00007 //# the Free Software Foundation; either version 2 of the License, or (at your
00008 //# option) any later version.
00009 //#
00010 //# This library is distributed in the hope that it will be useful, but WITHOUT
00011 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00013 //# License for more details.
00014 //#
00015 //# You should have received a copy of the GNU Library General Public License
00016 //# along with this library; if not, write to the Free Software Foundation,
00017 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00018 //#
00019 //# Correspondence concerning AIPS++ should be addressed as follows:
00020 //#        Internet email: aips2-request@nrao.edu.
00021 //#        Postal address: AIPS++ Project Office
00022 //#                        National Radio Astronomy Observatory
00023 //#                        520 Edgemont Road
00024 //#                        Charlottesville, VA 22903-2475 USA
00025 //#
00026 //# $Id: ExprConeNode.h 21262 2012-09-07 12:38:36Z gervandiepen $
00027 
00028 #ifndef TABLES_EXPRCONENODE_H
00029 #define TABLES_EXPRCONENODE_H
00030 
00031 //# Includes
00032 #include <casacore/casa/aips.h>
00033 #include <casacore/tables/TaQL/ExprFuncNode.h>
00034 #include <casacore/tables/TaQL/ExprFuncNodeArray.h>
00035 
00036 namespace casacore { //# NAMESPACE CASACORE - BEGIN
00037 
00038 
00039 // <summary>
00040 // Class representing a cone search in table select expression
00041 // </summary>
00042 
00043 // <use visibility=local>
00044 
00045 // <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="">
00046 // </reviewed>
00047 // <prerequisite>
00048 //# Classes you should understand before using this one.
00049 //   <li> <linkto class=TableExprFuncNode>TableExprFuncNode</linkto>
00050 // </prerequisite>
00051 
00052 // <synopsis> 
00053 // The class represents a cone search.
00054 // It is a specialization of the TableExprFuncNode class.
00055 // Currently the implementation is straightforward, but in the future
00056 // it can do smarter things.
00057 // For instance:
00058 // <ul>
00059 //  <li> If the cone positions and radii are constant, one can use
00060 //       an integer zone number (e.g. floor(dec)) to avoid the much
00061 //       more expensive sine/cosine calculations. Each cone will get a
00062 //       minzone and maxzone value (derived from cone position and radius).
00063 //  <li> Multiple cones can be ordered on minzone and maxzone.
00064 // </ul>
00065 // </synopsis> 
00066 
00067 
00068 class TableExprConeNode : public TableExprFuncNode
00069 {
00070 public:
00071   // Constructor
00072   TableExprConeNode (FunctionType, NodeDataType,
00073                      const TableExprNodeSet& source, uInt origin);
00074 
00075   // Destructor
00076   ~TableExprConeNode();
00077 
00078   // 'get' Functions to get the desired result of a function.
00079   // <group>
00080   Bool  getBool (const TableExprId& id);
00081   Int64 getInt  (const TableExprId& id);
00082   // </group>
00083 
00084   // Check the data and value types of the operands.
00085   // It sets the exptected data and value types of the operands.
00086   // Set the value type of the function result and returns
00087   // the data type of the function result.
00088   static NodeDataType checkOperands (Block<Int>& dtypeOper,
00089                                      ValueType& resVT,
00090                                      Block<Int>& vtypeOper,
00091                                      FunctionType,
00092                                      PtrBlock<TableExprNodeRep*>&);
00093 
00094   // Link the children to the node and convert the children
00095   // to constants if possible. Also convert the node to
00096   // constant if possible.
00097   static TableExprNodeRep* fillNode (TableExprConeNode* thisNode,
00098                                      PtrBlock<TableExprNodeRep*>& nodes,
00099                                      const Block<Int>& dtypeOper);
00100 
00101   // Link the children to the node and convert the children
00102   // to constants if possible.
00103   static void fillChildNodes (TableExprConeNode* thisNode,
00104                               PtrBlock<TableExprNodeRep*>& nodes,
00105                               const Block<Int>& dtypeOper);
00106 
00107 private:
00108   // Try if the function gives a constant result.
00109   // If so, set the expression type to Constant.
00110   void tryToConst();
00111 
00112   // Find the number of elements in an argument.
00113   // It returns -1 if unknown.
00114   static Int findNelem (const TableExprNodeRep* node);
00115 
00116 
00117   uInt origin_p;
00118 };
00119 
00120 
00121 
00122 
00123 class TableExprConeNodeArray : public TableExprFuncNodeArray
00124 {
00125 public:
00126   // Constructor
00127   TableExprConeNodeArray (TableExprFuncNode::FunctionType, NodeDataType,
00128                           const TableExprNodeSet& source, uInt origin);
00129 
00130   // Destructor
00131   ~TableExprConeNodeArray();
00132 
00133   // 'get' Functions to get the desired result of a function.
00134   // <group>
00135   MArray<Bool>  getArrayBool (const TableExprId& id);
00136   MArray<Int64> getArrayInt  (const TableExprId& id);
00137   // </group>
00138 
00139   // Link the children to the node and convert the children
00140   // to constants if possible. Also convert the node to
00141   // constant if possible.
00142   static TableExprNodeRep* fillNode (TableExprConeNodeArray* thisNode,
00143                                      PtrBlock<TableExprNodeRep*>& nodes,
00144                                      const Block<Int>& dtypeOper);
00145 
00146   // Link the children to the node and convert the children
00147   // to constants if possible.
00148   static void fillChildNodes (TableExprConeNodeArray* thisNode,
00149                               PtrBlock<TableExprNodeRep*>& nodes,
00150                               const Block<Int>& dtypeOper);
00151 
00152 private:
00153   // Try if the function gives a constant result.
00154   // If so, set the expression type to Constant.
00155   void tryToConst();
00156 
00157 
00158   uInt origin_p;
00159 };
00160 
00161 
00162 } //# NAMESPACE CASACORE - END
00163 
00164 #endif
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