org.jruby.util

Class SafeDoubleParser

java.lang.Object

org.jruby.util.SafeDoubleParser

public final class SafeDoubleParser
extends java.lang.Object

A safer way to parse double values

Prevents brute force attacks using the famous Java bug.

Field Summary

Fields

Modifier and Type	Field and Description
protected static java.math.BigDecimal	LOWER Lower allowed value
protected static java.math.BigDecimal	MIDDLE The middle of the bad interval - used for rounding bad values
protected static java.math.BigDecimal	TWO Constant 2
protected static java.math.BigDecimal	UPPER Upper allowed value

Constructor Summary

Constructors

Constructor and Description
SafeDoubleParser()

Method Summary

Modifier and Type	Method and Description
protected static double	decimalValue(java.math.BigDecimal bigDecimal) Safe way of getting the double value Prevents BigDecimal from calling Double.parseDouble()
protected static double	decimalValue(java.lang.Number number) Safe way of getting the double value prevents BigDecimal from calling Double.parseDouble()
protected static java.lang.Double	decimalValueOf(java.lang.String s) Safe parsing of a String into a Double
static double	doubleValue(java.math.BigDecimal bigDecimal) Safe way of getting the double value Prevents BigDecimal from calling Double.parseDouble()
static double	doubleValue(java.lang.Number number) Safe way of getting the double value prevents BigDecimal from calling Double.parseDouble()
protected static boolean	isSuspicious(java.lang.String s) Heuristic test if we should look closer at the value
static java.lang.Double	parseDouble(java.lang.String s) Safe way of parsing a Double value from a String
static java.lang.Double	valueOf(java.lang.String s) Safe way of parsing a Double value from a String

Methods inherited from class java.lang.Object

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

Field Detail

TWO

protected static final java.math.BigDecimal TWO

Constant 2

LOWER

protected static final java.math.BigDecimal LOWER

Lower allowed value

UPPER

protected static final java.math.BigDecimal UPPER

Upper allowed value

MIDDLE

protected static final java.math.BigDecimal MIDDLE

The middle of the bad interval - used for rounding bad values

Constructor Detail

SafeDoubleParser

public SafeDoubleParser()

Method Detail

valueOf

public static java.lang.Double valueOf(java.lang.String s)

Safe way of parsing a Double value from a String

Parameters:

s - The input String

Returns:

the Double value

parseDouble

public static java.lang.Double parseDouble(java.lang.String s)

Safe way of parsing a Double value from a String

Parameters:

s - The input String

Returns:

the Double value

doubleValue

public static double doubleValue(java.lang.Number number)

Safe way of getting the double value
prevents BigDecimal from calling Double.parseDouble()

Parameters:

number -

Returns:

the double value

doubleValue

public static double doubleValue(java.math.BigDecimal bigDecimal)

Safe way of getting the double value
Prevents BigDecimal from calling Double.parseDouble()

Parameters:

bigDecimal -

Returns:

the double value

isSuspicious

protected static final boolean isSuspicious(java.lang.String s)

Heuristic test if we should look closer at the value

Parameters:

s - The non-null input String

Returns:

true if the value is suspicious, false otherwise

decimalValueOf

protected static final java.lang.Double decimalValueOf(java.lang.String s)

Safe parsing of a String into a Double

Parameters:

s - The input String, can be null

Returns:

The Double value

decimalValue

protected static final double decimalValue(java.lang.Number number)

Safe way of getting the double value
prevents BigDecimal from calling Double.parseDouble()

Parameters:

number -

Returns:

the double value

decimalValue

protected static final double decimalValue(java.math.BigDecimal bigDecimal)

Safe way of getting the double value
Prevents BigDecimal from calling Double.parseDouble()

Parameters:

bigDecimal -

Returns:

the double value