/*****************************************************************************
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.math.BigDecimal;
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 final class Modulus 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};
}
public static Comparable<?> remainder(Comparable<?> param1, Comparable<?> param2) throws ParseException {
if (param1 == null || param2 == null) {
return null;
}
if (param1 instanceof String) {
param1 = parse((String)param1);
}
if (param2 instanceof String) {
param2 = parse((String)param2);
}
if (param1 instanceof Number && param2 instanceof Number) {
// BigInteger type is not supported
if (param1 instanceof BigDecimal || param2 instanceof BigDecimal) {
BigDecimal b1 = getBigDecimal((Number)param1);
BigDecimal b2 = getBigDecimal((Number)param2);
return b1.remainder(b2);
}
if (param1 instanceof Double || param2 instanceof Double || param1 instanceof Float || param2 instanceof Float) {
return ((Number)param1).doubleValue() % ((Number)param2).doubleValue();
} else { // Long, Integer, Short, Byte
long l1 = ((Number)param1).longValue();
long l2 = ((Number)param2).longValue();
return l1 % l2;
}
} else {
throw new ParseException(WRONG_TYPE+" ("+param1.getClass()+"%"+param2.getClass()+")");
}
}
public Comparable<?> getResult(Comparable<?>... comparables)
throws ParseException {
return remainder(comparables[0],comparables[1]);
}
}