org.apache.calcite.util

Class NumberUtil

java.lang.Object

org.apache.calcite.util.NumberUtil

public class NumberUtil
extends Object

Utility functions for working with numbers.

Field Summary

Fields

Modifier and Type	Field and Description
private static BigInteger[]	BIG_INT_MAX_UNSCALED
private static BigInteger[]	BIG_INT_MIN_UNSCALED
private static BigInteger[]	BIG_INT_TEN_POW
private static DecimalFormat	DOUBLE_FORMATTER
private static DecimalFormat	FLOAT_FORMATTER

Constructor Summary

Constructors

Modifier	Constructor and Description
private	NumberUtil()

Method Summary

Modifier and Type	Method and Description
static Double	add(Double a, Double b)
static DecimalFormat	decimalFormat(String pattern) Creates a format.
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	min(Double a, Double b) Like Math.min(int, int) but null safe.
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

FLOAT_FORMATTER

private static final DecimalFormat FLOAT_FORMATTER

DOUBLE_FORMATTER

private static final DecimalFormat DOUBLE_FORMATTER

BIG_INT_TEN_POW

private static final BigInteger[] BIG_INT_TEN_POW

BIG_INT_MIN_UNSCALED

private static final BigInteger[] BIG_INT_MIN_UNSCALED

BIG_INT_MAX_UNSCALED

private static final BigInteger[] BIG_INT_MAX_UNSCALED

Constructor Detail

NumberUtil

private NumberUtil()

Method Detail

decimalFormat

public static DecimalFormat decimalFormat(String pattern)

Creates a format. Locale-independent.

powTen

public static BigInteger powTen(int exponent)

getMaxUnscaled

public static BigInteger getMaxUnscaled(int precision)

getMinUnscaled

public static BigInteger getMinUnscaled(int precision)

rescaleBigDecimal

public static BigDecimal rescaleBigDecimal(BigDecimal bd,
                                           int scale)

toBigDecimal

public static BigDecimal toBigDecimal(Number number,
                                      int scale)

toBigDecimal

public static 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)

min

public static Double min(Double a,
                         Double b)

Like Math.min(int, int) but null safe.