source: trunk/src/Accelerator.h@ 3037

#ifndef ASAPACCELERATOR_H
#define ASAPACCELERATOR_H
//
// C++ Interface: CustomTableExprNode
//
// Description:
//      Various utilities for speed.
//
// Author: Kohji Nakamura <k.nakamura@nao.ac.jp>, (C) 2012
//
// Copyright: See COPYING file that comes with this distribution
//
//

#include <casa/Utilities/Assert.h>
#include <tables/Tables/ExprNode.h>
#include <tables/Tables/ScalarColumn.h>

namespace asap {

using namespace casa;

class TableExprPredicate {
public:
        virtual ~TableExprPredicate() {}
        virtual Bool match(Table const& table, const TableExprId& id) = 0;
};

class CustomTableExprNodeRep :public TableExprNodeRep {
        TableExprPredicate & pred_;
public:
        CustomTableExprNodeRep(const Table &table,
                TableExprPredicate & pred)
        :TableExprNodeRep(TableExprNodeRep::NTBool,
                TableExprNodeRep::VTScalar,
                TableExprNodeRep::OtUndef,
                table),
        pred_(pred) {}
        virtual ~CustomTableExprNodeRep() {}
        virtual Bool getBool(const TableExprId& id) {
                return pred_.match(table(), id);
        }
};

class CustomTableExprNode: public TableExprNode {
public:
        CustomTableExprNode(CustomTableExprNodeRep &nodeRep)
        : TableExprNode(&nodeRep) {
        }
        virtual ~CustomTableExprNode() {
        }
};

template<typename T, size_t N>
class SingleTypeEqPredicate: public TableExprPredicate {
        Table const & table;
        ROScalarColumn<T> *cols[N];
        T const *values;
public:
        SingleTypeEqPredicate(Table const &table_, 
                char const*const colNames[],
                T const values_[]):
                        table(table_), values(values_) {
                for (size_t i = 0; i < N; i++) {
                        cols[i] = new ROScalarColumn<T>(table, colNames[i]);
                }
        }
        virtual ~SingleTypeEqPredicate() {
                for (size_t i = 0; i < N; i++) {
                        delete cols[i];
                }
        }
        virtual Bool match(Table const& table, const TableExprId& id) {
                DebugAssert(&table == &this->table, AipsError);
                for (size_t i = 0; i < N; i++) {
                        T v;
                        cols[i]->get(id.rownr(), v);
                        if (v != values[i]) {
                                return false;
                        }
                }
                return true;
        }
};

} // asap

#endif // ASAPACCELERATOR_H