Top Description Fields Constructors Methods
ch.randelshofer.fastdoubleparser

pack-priv abstract Class AbstractJsonFloatingPointBitsFromCharArray

extends AbstractFloatValueParser
Class Inheritance
Known Direct Subclasses
ch.randelshofer.fastdoubleparser.JsonDoubleBitsFromCharArray
Parses a Java FloatingPointLiteral from a char array.

This class should have a type parameter for the return value of its parse methods. Unfortunately Java does not support type parameters for primitive types. As a workaround we use long. A long has enough bits to fit a double value or a float value.

See JavaDoubleParser for the grammar of FloatingPointLiteral.

Field Summary

Inherited from ch.randelshofer.fastdoubleparser.AbstractFloatValueParser:
MAX_EXPONENT_NUMBERMAX_INPUT_LENGTHMINIMAL_NINETEEN_DIGIT_INTEGER

Constructor Summary

AccessConstructor and Description
pack-priv
AbstractJsonFloatingPointBitsFromCharArray()

Method Summary

Modifier and TypeMethod and Description
public final long

Returns:

the bit pattern of the parsed value, if the input is legal; otherwise, -1L.
parseNumber(char[]
a string containing a FloatingPointLiteralWithWhiteSpace
str, int
start offset of FloatingPointLiteralWithWhiteSpace in str
offset, int
length of FloatingPointLiteralWithWhiteSpace in str
length)

Parses a number production.

private int
tryToParseEightDigits(char[] str, int offset)

pack-priv abstract long

Returns:

the bit pattern of the parsed value, if the input is legal; otherwise, -1L.
valueOfFloatLiteral(char[]
the string that contains the float literal (and maybe more)
str, int
the start index (inclusive) of the float literal inside the string
startIndex, int
the end index (exclusive) of the float literal inside the string
endIndex, boolean
whether the float value is negative
isNegative, long
the significand of the float value (can be truncated)
significand, int
the exponent of the float value
exponent, boolean
whether the significand is truncated
isSignificandTruncated, int
the exponent value of the truncated significand
exponentOfTruncatedSignificand)

Computes a float value from the given components of a decimal float literal.

Constructor Detail

AbstractJsonFloatingPointBitsFromCharArrayback to summary
pack-priv AbstractJsonFloatingPointBitsFromCharArray()

Method Detail

parseNumberback to summary
public final long parseNumber(char[] str, int offset, int length)

Parses a number production.

See JsonDoubleParser for the grammar of number.

Parameters
str:char[]

a string containing a FloatingPointLiteralWithWhiteSpace

offset:int

start offset of FloatingPointLiteralWithWhiteSpace in str

length:int

length of FloatingPointLiteralWithWhiteSpace in str

Returns:long

the bit pattern of the parsed value, if the input is legal; otherwise, -1L.

tryToParseEightDigitsback to summary
private int tryToParseEightDigits(char[] str, int offset)
valueOfFloatLiteralback to summary
pack-priv abstract long valueOfFloatLiteral(char[] str, int startIndex, int endIndex, boolean isNegative, long significand, int exponent, boolean isSignificandTruncated, int exponentOfTruncatedSignificand)

Computes a float value from the given components of a decimal float literal.

Parameters
str:char[]

the string that contains the float literal (and maybe more)

startIndex:int

the start index (inclusive) of the float literal inside the string

endIndex:int

the end index (exclusive) of the float literal inside the string

isNegative:boolean

whether the float value is negative

significand:long

the significand of the float value (can be truncated)

exponent:int

the exponent of the float value

isSignificandTruncated:boolean

whether the significand is truncated

exponentOfTruncatedSignificand:int

the exponent value of the truncated significand

Returns:long

the bit pattern of the parsed value, if the input is legal; otherwise, -1L.