package org.boris.expr.function.excel;
import org.boris.expr.Expr;
import org.boris.expr.ExprDouble;
import org.boris.expr.ExprError;
import org.boris.expr.ExprException;
import org.boris.expr.function.AbstractFunction;
import org.boris.expr.util.Financials;
public class DDB extends AbstractFunction
{
public Expr evaluate(Expr[] args) throws ExprException {
assertMinArgCount(args, 4);
assertMaxArgCount(args, 5);
double cost = asDouble(args[0], true);
if (cost < 0)
return ExprError.NUM;
double salvage = asDouble(args[1], true);
if (salvage < 0)
return ExprError.NUM;
int life = asInteger(args[2], true);
if (life < 0)
return ExprError.NUM;
int period = asInteger(args[3], true);
if (period < 0)
return ExprError.NUM;
double factor = 2;
if (args.length == 5)
factor = asDouble(args[4], true);
if (cost == 0)
return ExprDouble.ZERO;
return new ExprDouble(Financials.ddb(cost, salvage, life, period,
factor));
}
}