Package one.microstream.chars

Class CharConversion_double

java.lang.Object

one.microstream.chars.CharConversion_double

public final class CharConversion_double
extends Object

Constructor Summary

Constructors

Constructor	Description
CharConversion_double()

Method Summary

Modifier and Type	Method	Description
static int	put(double value, char[] target, int offset)	This algorithm is somewhere from 3 times to 25 times (depending on exponent) faster than the infinite spaghetti code used in JDK.

Methods inherited from class java.lang.Object

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

Constructor Detail

CharConversion_double

public CharConversion_double()

Method Detail

put

public static final int put(double value,
                            char[] target,
                            int offset)

This algorithm is somewhere from 3 times to 25 times (depending on exponent) faster than the infinite spaghetti code used in JDK. It generates discrepancies of +/- 1 at the 16th digit and +/- 8 in the 17th digit compared to the stricter JDK algorithm. As digits 16 and 17 cannot be relied upon anyway due to the technical floating point inaccuracy (e.g. the JDK double parser generates comparable discrepancies), the algorithm is still deemed correct ("enough").

Otherwise, the behavior of the algorithm is the same as that of the JDK implementation (i.e. decimal point character '.', denormalized representation in range ]1E7; 1E-3], exponent character 'E', etc.

Note that this method is intended as an implementation detail and a "know-what-you-are-doing" tool that does not perform array bound checks. If array bound checking is desired, use VarString.add(double) explicitly.

Parameters:

value - the value to be represented as a character sequence.

target - the array to receive the character sequence at the given offset.

offset - the offset in the target array where the character sequence shall start.

Returns:

the offset pointing to the index after the last character of the assembled sequence.