org.eigenbase.util14
Class NumberUtil

java.lang.Object
  org.eigenbase.util14.NumberUtil

public class NumberUtil
extends Object

Utility functions for working with numbers This class is JDK 1.4 compatible.

Since:

Jan 9, 2006

Version:

$Id: //open/dev/farrago/src/org/eigenbase/util14/NumberUtil.java#12 $

Author:

angel

Field Summary

private static BigInteger[]	bigIntMaxUnscaled
private static BigInteger[]	bigIntMinUnscaled
private static BigInteger	bigIntTen
private static BigInteger[]	bigIntTenPow
private static DecimalFormat	doubleFormatter
private static DecimalFormat	floatFormatter
static Integer	INTEGER_ONE
static Integer	INTEGER_ZERO
static Byte	MAX_BYTE
static Double	MAX_DOUBLE
static Float	MAX_FLOAT
static Integer	MAX_INTEGER
static Long	MAX_LONG
static Short	MAX_SHORT
static Byte	MIN_BYTE
static Double	MIN_DOUBLE
static Float	MIN_FLOAT
static Integer	MIN_INTEGER
static Long	MIN_LONG
static Short	MIN_SHORT

Constructor Summary

NumberUtil()

Method Summary

static Double	add(Double a, Double b)
static Double	divide(Double a, Double b)
static NumberFormat	getApproxFormatter(boolean isFloat)
static BigInteger	getMaxUnscaled(int precision)
static BigInteger	getMinUnscaled(int precision)
static boolean	isValidDecimal(BigDecimal bd)
static Double	multiply(Double a, Double b)
static BigInteger	powTen(int exponent)
static BigDecimal	rescaleBigDecimal(BigDecimal bd, int scale)
static long	round(double d)
static BigDecimal	toBigDecimal(Number number)
static BigDecimal	toBigDecimal(Number number, int scale)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

floatFormatter

private static final DecimalFormat floatFormatter

doubleFormatter

private static final DecimalFormat doubleFormatter

bigIntTenPow

private static final BigInteger[] bigIntTenPow

bigIntMinUnscaled

private static final BigInteger[] bigIntMinUnscaled

bigIntMaxUnscaled

private static final BigInteger[] bigIntMaxUnscaled

bigIntTen

private static final BigInteger bigIntTen

MIN_BYTE

public static final Byte MIN_BYTE

MAX_BYTE

public static final Byte MAX_BYTE

MIN_INTEGER

public static final Integer MIN_INTEGER

MAX_INTEGER

public static final Integer MAX_INTEGER

MIN_SHORT

public static final Short MIN_SHORT

MAX_SHORT

public static final Short MAX_SHORT

MIN_LONG

public static final Long MIN_LONG

MAX_LONG

public static final Long MAX_LONG

MIN_FLOAT

public static final Float MIN_FLOAT

MAX_FLOAT

public static final Float MAX_FLOAT

MIN_DOUBLE

public static final Double MIN_DOUBLE

MAX_DOUBLE

public static final Double MAX_DOUBLE

INTEGER_ZERO

public static final Integer INTEGER_ZERO

INTEGER_ONE

public static final Integer INTEGER_ONE

Constructor Detail

NumberUtil

public NumberUtil()

Method Detail

powTen

public static final BigInteger powTen(int exponent)

getMaxUnscaled

public static final BigInteger getMaxUnscaled(int precision)

getMinUnscaled

public static final BigInteger getMinUnscaled(int precision)

rescaleBigDecimal

public static final BigDecimal rescaleBigDecimal(BigDecimal bd,
                                                 int scale)

toBigDecimal

public static final BigDecimal toBigDecimal(Number number,
                                            int scale)

toBigDecimal

public static final BigDecimal toBigDecimal(Number number)

isValidDecimal

public static boolean isValidDecimal(BigDecimal bd)

Returns:

whether a BigDecimal is a valid Farrago decimal. If a BigDecimal's unscaled value overflows a long, then it is not a valid Farrago decimal.

getApproxFormatter

public static NumberFormat getApproxFormatter(boolean isFloat)

round

public static long round(double d)

add

public static Double add(Double a,
                         Double b)

divide

public static Double divide(Double a,
                            Double b)

multiply

public static Double multiply(Double a,
                              Double b)