/*****************************************************************************
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.util.Calendar;
import java.sql.*;
import static 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;
public class SubTime extends PostfixCommand {
final public int getNumberOfParameters() {
return 2;
}
/**
* Calculates the result of applying the "+" operator to the arguments from
* the stack and pushes it back on the stack.
*/
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};
}
public static java.util.Date subTime(Comparable<?> param1, Comparable<?> param2, Calendar cal) throws ParseException {
if (param1 == null || param2 == null) {
return null;
}
if ((param1 instanceof Time || param1 instanceof Timestamp) && param2 instanceof Time) {
java.util.Date d1 = (java.util.Date)param1;
java.util.Date d2 = (java.util.Date)param2;
cal.setTimeInMillis(d2.getTime());
int h = cal.get(HOUR_OF_DAY);
int m = cal.get(MINUTE);
int s = cal.get(SECOND);
cal.setTimeInMillis(d1.getTime());
cal.add(SECOND, -s);
cal.add(MINUTE, -m);
cal.roll(HOUR_OF_DAY, -h);
return (param1 instanceof Time) ? new Time(cal.getTimeInMillis()) : new Timestamp(cal.getTimeInMillis());
} else {
throw new ParseException(WRONG_TYPE+" subtime("+param1.getClass()+","+param2.getClass()+")");
}
}
public Comparable<?> getResult(Comparable<?>... comparables)
throws ParseException {
return subTime(comparables[0],comparables[1],JepRuntime.getCalendar());
}
}