/* 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_replace.cpp 3923 2013-06-19 21:43:06Z bwilkinson $
*
*
****************************************************************************/

#include <string>
using namespace std;

#include "functor_str.h"
#include "functioncolumn.h"
using namespace execplan;

#include "rowgroup.h"
using namespace rowgroup;

#include "joblisttypes.h"
using namespace joblist;

#include "collation.h"

namespace funcexp
{

CalpontSystemCatalog::ColType Func_replace::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
{
    // operation type is not used by this functor
    return fp[0]->data()->resultType();
}


std::string Func_replace::getStrVal(rowgroup::Row& row,
                                    FunctionParm& fp,
                                    bool& isNull,
                                    execplan::CalpontSystemCatalog::ColType&)
{
    const string& str = fp[0]->data()->getStrVal(row, isNull);

    const string& fromstr = fp[1]->data()->getStrVal(row, isNull);

    const string& tostr = fp[2]->data()->getStrVal(row, isNull);

    string newstr;
    unsigned int i = 0;

    for (;;)
    {
        size_t pos = str.find(fromstr, i);

        if ( pos != string::npos )
        {
            //match
            if ( pos > i )
                newstr = newstr + str.substr(i, pos - i);

            newstr = newstr + tostr;
            i = pos + fromstr.size();
        }
        else
        {
            newstr = newstr + str.substr(i, 1000);
            break;
        }
    }

    return newstr;
}


} // namespace funcexp
// vim:ts=4 sw=4: