Module ch.randelshofer.fastdoubleparser

Package ch.randelshofer.fastdoubleparser

Class AbstractJsonFloatingPointBitsFromCharSequence

java.lang.Object

ch.randelshofer.fastdoubleparser.AbstractNumberParser

ch.randelshofer.fastdoubleparser.AbstractFloatValueParser

ch.randelshofer.fastdoubleparser.AbstractJsonFloatingPointBitsFromCharSequence

Direct Known Subclasses:

JsonDoubleBitsFromCharSequence

abstract class AbstractJsonFloatingPointBitsFromCharSequence
extends AbstractFloatValueParser

Parses a JSON number from a CharSequence.

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 JsonDoubleParser for the grammar of Number.

Field Summary

Fields inherited from class ch.randelshofer.fastdoubleparser.AbstractFloatValueParser

MAX_EXPONENT_NUMBER, MAX_INPUT_LENGTH, MINIMAL_NINETEEN_DIGIT_INTEGER

Fields inherited from class ch.randelshofer.fastdoubleparser.AbstractNumberParser

CHAR_TO_HEX_MAP, DECIMAL_POINT_CLASS, ILLEGAL_OFFSET_OR_ILLEGAL_LENGTH, OTHER_CLASS, SYNTAX_ERROR, SYNTAX_ERROR_BITS, VALUE_EXCEEDS_LIMITS

Constructor Summary

Constructors

Constructor	Description
AbstractJsonFloatingPointBitsFromCharSequence()

Method Summary

Modifier and Type	Method	Description
long	parseNumber(java.lang.CharSequence str, int offset, int length)	Parses a number production.
(package private) abstract long	valueOfFloatLiteral(java.lang.CharSequence 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 number literal.

Methods inherited from class ch.randelshofer.fastdoubleparser.AbstractNumberParser

charAt, charAt, charAt, checkBounds, checkBounds, lookupHex, lookupHex

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractJsonFloatingPointBitsFromCharSequence

AbstractJsonFloatingPointBitsFromCharSequence()

Method Detail

parseNumber

public final long parseNumber(java.lang.CharSequence str,
                              int offset,
                              int length)

Parses a number production.

See JsonDoubleParser for the grammar of number.

Parameters:

str - a string containing a FloatingPointLiteralWithWhiteSpace

offset - start offset of FloatingPointLiteralWithWhiteSpace in str

length - length of FloatingPointLiteralWithWhiteSpace in str

Returns:

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

valueOfFloatLiteral

abstract long valueOfFloatLiteral(java.lang.CharSequence 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 number literal.

Parameters:

str - the string that contains the number literal (and maybe more)

startIndex - the start index (inclusive) of the number literal inside the string

endIndex - the end index (exclusive) of the number literal inside the string

isNegative - whether the float value is negative

significand - the significand of the float value (can be truncated)

exponent - the exponent of the float value

isSignificandTruncated - whether the significand is truncated

exponentOfTruncatedSignificand - the exponent value of the truncated significand

Returns:

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