the begginning

utils/funcexp/func_get_format.cpp

@@ -0,0 +1,118 @@
+/* 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: func_get_format.cpp 2665 2011-06-01 20:42:52Z rdempsey $
+*
+*
+****************************************************************************/
+
+#include <cstdlib>
+#include <string>
+using namespace std;
+
+#include "functor_str.h"
+#include "funchelpers.h"
+#include "functioncolumn.h"
+#include "rowgroup.h"
+using namespace execplan;
+
+#include "dataconvert.h"
+using namespace dataconvert;
+
+class to_upper
+{
+    public:
+        char operator() (char c) const            // notice the return type
+        {
+            return toupper(c);
+        }
+};
+
+
+namespace funcexp
+{
+
+string known_date_time_formats[5][4]=
+{
+  {"USA", "%m.%d.%Y", "%Y-%m-%d %H.%i.%s", "%h:%i:%s %p" },
+  {"JIS", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },
+  {"ISO", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },
+  {"EUR", "%d.%m.%Y", "%Y-%m-%d %H.%i.%s", "%H.%i.%s" },
+  {"INTERNAL", "%Y%m%d",   "%Y%m%d%H%i%s", "%H%i%s" }
+};
+
+string know_types[3]=
+{
+	"DATE", "DATETIME", "TIME"
+};
+
+CalpontSystemCatalog::ColType Func_get_format::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
+{
+	return resultType;
+}
+
+string Func_get_format::getStrVal(rowgroup::Row& row,
+							FunctionParm& parm,
+							bool& isNull,
+							CalpontSystemCatalog::ColType&)
+{
+	// parm[0] -- format
+	// parm[1] -- type
+	string format = parm[0]->data()->getStrVal(row, isNull);
+	if (isNull)
+		return "";
+
+	transform (format.begin(), format.end(), format.begin(), to_upper());
+
+	string type = parm[1]->data()->getStrVal(row, isNull);
+	if (isNull)
+		return "";
+
+	transform (type.begin(), type.end(), type.begin(), to_upper());
+
+	int itype = 0;
+	for ( ; itype < 3 ; itype++ )
+	{
+		if ( know_types[itype] == type )
+			break;
+	}
+
+	// check for match
+	if ( itype == 3 )
+		return "";
+
+	for ( int i = 0 ; i < 5 ; i ++ )
+	{
+		if ( known_date_time_formats[i][0] == format )
+		{
+			switch (itype) {
+				case 0:
+					return known_date_time_formats[i][2];
+					break;
+				default:
+					return "";
+			}
+		}
+	}
+
+	return "";
+}
+
+
+} // namespace funcexp
+// vim:ts=4 sw=4: