/*
* This program is free software; you can redistribute it and/or modify it under the terms of
* the GNU AFFERO GENERAL PUBLIC LICENSE as published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
*
* 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 AFFERO GENERAL PUBLIC LICENSE for more details.
* You should have received a copy of the GNU AFFERO GENERAL PUBLIC LICENSE along with this program;
* if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package com.meidusa.amoeba.parser.function;
import java.util.Iterator;
import java.util.List;
import com.meidusa.amoeba.parser.expression.Expression;
import com.meidusa.amoeba.sqljep.ParseException;
/**
*
* @author <a href=mailto:piratebase@sina.com>Struct chen</a>
*
*/
public class Concat extends AbstractFunction {
@SuppressWarnings("unchecked")
public Comparable evaluate(List<Expression> list, Object[] parameters)
throws ParseException {
Comparable param1 = null;
if(list.size()>=2){
Iterator<Expression> it =list.iterator();
param1 = it.next().evaluate(parameters);
Comparable param2 = it.next().evaluate(parameters);
param1 = com.meidusa.amoeba.sqljep.function.Concat.concat(param1, param2);
for(;it.hasNext();){
param2 = it.next().evaluate(parameters);
param1 = com.meidusa.amoeba.sqljep.function.Concat.concat(param1, param2);
}
}
return param1;
}
}