/*****************************************************************************
SQLJEP - Java SQL Expression Parser 0.2
November 1 2006
(c) Copyright 2006, Alexey Gaidukov
SQLJEP Author: Alexey Gaidukov
SQLJEP is based on JEP 2.24 (http://www.singularsys.com/jep/)
(c) Copyright 2002, Nathan Funk
See LICENSE.txt for license information.
*****************************************************************************/
package com.meidusa.amoeba.sqljep.function;
import java.sql.Timestamp;
import java.util.Calendar;
import com.meidusa.amoeba.sqljep.function.PostfixCommand;
import com.meidusa.amoeba.sqljep.ASTFunNode;
import com.meidusa.amoeba.sqljep.JepRuntime;
import com.meidusa.amoeba.sqljep.ParseException;
import com.meidusa.amoeba.util.StaticString;
import com.meidusa.amoeba.util.ThreadLocalMap;
public class AddMonths extends PostfixCommand {
final public int getNumberOfParameters() {
return 2;
}
public Comparable<?>[] evaluate(ASTFunNode node, JepRuntime runtime) throws ParseException {
node.childrenAccept(runtime.ev, null);
Comparable<?> param2 = runtime.stack.pop();
Comparable<?> param1 = runtime.stack.pop();
return new Comparable<?>[]{param1,param2};
//runtime.stack.push(addMonths(param1, param2, runtime.calendar)); // push the result on the inStack
}
public static java.util.Date addMonths(Comparable<?> param1, Comparable<?> param2, Calendar cal) throws ParseException {
if (param1 == null && param2 == null) {
return null;
}
try {
int months = getInteger(param2);
if (param1 instanceof Timestamp) {
Timestamp d = (Timestamp)param1;
cal.setTimeInMillis(d.getTime());
cal.add(Calendar.MONTH, months);
return new Timestamp(cal.getTimeInMillis());
}
else if (param1 instanceof java.sql.Date) {
java.util.Date d = (java.util.Date)param1;
cal.setTimeInMillis(d.getTime());
cal.add(Calendar.MONTH, months);
return new java.util.Date(cal.getTimeInMillis());
} else {
throw new ParseException();
}
} catch (ParseException e) {
throw new ParseException(WRONG_TYPE+" month_between("+param1.getClass()+","+param2.getClass()+")");
}
}
public Comparable<?> getResult(Comparable<?>... comparables)
throws ParseException {
Calendar calendar = (Calendar)ThreadLocalMap.get(StaticString.CALENDAR);
if (calendar == null) {
calendar = Calendar.getInstance();
ThreadLocalMap.put(StaticString.CALENDAR,calendar);
}
return addMonths(comparables[0], comparables[1], calendar);
}
}