the begginning

utils/funcexp/functor.h

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+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+//  $Id: functor.h 3495 2013-01-21 14:09:51Z rdempsey $
+
+/** @file */
+
+#ifndef FUNCTOR_H
+#define FUNCTOR_H
+
+#include <cstdlib>
+#include <string>
+#include <sstream>
+#include <string>
+
+#include "parsetree.h"
+#include "exceptclasses.h"
+#include "errorids.h"
+#include "idberrorinfo.h"
+
+#include "calpontsystemcatalog.h"
+
+namespace rowgroup
+{
+	class Row;
+}
+
+namespace execplan
+{
+extern const std::string colDataTypeToString(CalpontSystemCatalog::ColDataType cdt);
+}
+
+namespace funcexp
+{
+//typedef std::vector<execplan::STNP> FunctionParm;
+typedef std::vector<execplan::SPTP> FunctionParm;
+
+
+/** @brief Func class
+  */
+class Func
+{
+public:
+	Func();
+	Func(const std::string& funcName);
+	virtual ~Func() {}
+
+	const std::string funcName() const { return fFuncName; }
+	void funcName(const std::string funcName) { fFuncName = funcName; }
+	virtual execplan::CalpontSystemCatalog::ColType operationType(FunctionParm& fp, execplan::CalpontSystemCatalog::ColType& resultType) = 0;
+
+	virtual int64_t getIntVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct) = 0;
+
+    virtual uint64_t getUintVal(rowgroup::Row& row,
+                                FunctionParm& fp,
+                                bool& isNull,
+                                execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ return static_cast<uint64_t>(getIntVal(row,fp,isNull,op_ct)); }
+
+    virtual double getDoubleVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct) = 0;
+
+	virtual std::string getStrVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct) = 0;
+
+	virtual execplan::IDB_Decimal getDecimalVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ return execplan::IDB_Decimal(getIntVal(row, fp, isNull, op_ct),0,0); }
+
+	virtual int32_t getDateIntVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ return intToDate(getIntVal(row, fp, isNull, op_ct)); }
+
+	virtual int64_t getDatetimeIntVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ return intToDatetime(getIntVal(row, fp, isNull, op_ct)); }
+
+	virtual bool getBoolVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ int64_t intVal = getIntVal(row, fp, isNull, op_ct); return (!isNull && intVal); }
+
+	virtual float getFloatVal(rowgroup::Row& row,
+								FunctionParm& fp,
+								bool& isNull,
+								execplan::CalpontSystemCatalog::ColType& op_ct)
+	{ return getDoubleVal(row, fp, isNull, op_ct); }
+
+	const float floatNullVal() const { return fFloatNullVal; }
+	const double doubleNullVal() const { return fDoubleNullVal; }
+
+protected:
+	virtual uint32_t stringToDate(std::string);
+	virtual uint64_t stringToDatetime(std::string);
+
+	virtual uint32_t intToDate(int64_t);
+	virtual uint64_t intToDatetime(int64_t);
+
+	virtual std::string intToString(int64_t);
+	virtual std::string doubleToString(double);
+
+	std::string fFuncName;
+
+private:
+	//defaults okay
+	//Func(const Func& rhs);
+	//Func& operator=(const Func& rhs);
+
+	void init();
+
+	float fFloatNullVal;
+	double fDoubleNullVal;
+};
+
+
+}
+
+#endif
+
+
+