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117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/****************************************************************************
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* $Id: func_substring_index.cpp 2477 2011-04-01 16:07:35Z rdempsey $
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*
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*
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****************************************************************************/
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#include <string>
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using namespace std;
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#include "functor_str.h"
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#include "functioncolumn.h"
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using namespace execplan;
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#include "rowgroup.h"
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using namespace rowgroup;
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#include "joblisttypes.h"
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using namespace joblist;
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#define STRCOLL_ENH__
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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_substring_index::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
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{
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// operation type is not used by this functor
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return fp[0]->data()->resultType();
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}
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std::string Func_substring_index::getStrVal(rowgroup::Row& row,
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FunctionParm& fp,
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bool& isNull,
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execplan::CalpontSystemCatalog::ColType&)
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{
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const string& str = fp[0]->data()->getStrVal(row, isNull);
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if (isNull)
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return "";
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const string& delim = fp[1]->data()->getStrVal(row, isNull);
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if (isNull)
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return "";
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int64_t count = fp[2]->data()->getIntVal(row,isNull);
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if (isNull)
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return "";
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if ( count == 0 )
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return "";
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size_t end = strlen(str.c_str());
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if ( count > (int64_t) end )
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return str;
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string value = str;
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if ( count > 0 ) {
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int pointer = 0;
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for ( int i = 0 ; i < count ; i ++ )
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{
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string::size_type pos = str.find(delim,pointer);
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if (pos != string::npos)
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pointer = pos+1;
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end = pos;
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}
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value = str.substr(0,end);
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}
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else
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{
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count = count *-1;
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size_t end = strlen(str.c_str());
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int pointer = end;
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int start = 0;
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for ( int i = 0 ; i < count ; i ++ )
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{
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string::size_type pos = str.rfind(delim,pointer);
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if (pos != string::npos) {
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if ( count > (int64_t) end )
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return "";
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pointer = pos-1;
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start = pos+1;
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}
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else
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start = 0;
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}
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value = str.substr(start,end);
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}
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return value;
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}
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} // namespace funcexp
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// vim:ts=4 sw=4:
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