Package org.meteoinfo.jts.precision

Class CommonBits


  • public class CommonBits
extends java.lang.Object
    Determines the maximum number of common most-significant bits in the mantissa of one or numbers. Can be used to compute the double-precision number which is represented by the common bits. If there are no common bits, the number computed is 0.0.

    • Constructor Summary

      Constructors 
      Constructor Description
      CommonBits​()  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void add​(double num)  
      static int getBit​(long bits, int i)
      Extracts the i'th bit of a bitstring.
      double getCommon​()  
      static int numCommonMostSigMantissaBits​(long num1, long num2)
      This computes the number of common most-significant bits in the mantissas of two double-precision numbers.
      static long signExpBits​(long num)
      Computes the bit pattern for the sign and exponent of a double-precision number.
      java.lang.String toString​(long bits)
      A representation of the Double bits formatted for easy readability
      static long zeroLowerBits​(long bits, int nBits)
      Zeroes the lower n bits of a bitstring.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • CommonBits

        public CommonBits​()

    • Method Detail

      • signExpBits

        public static long signExpBits​(long num)
        Computes the bit pattern for the sign and exponent of a double-precision number.
        Parameters:
        num -
        Returns:
        the bit pattern for the sign and exponent

      • numCommonMostSigMantissaBits

        public static int numCommonMostSigMantissaBits​(long num1,
                                               long num2)
        This computes the number of common most-significant bits in the mantissas of two double-precision numbers. It does not count the hidden bit, which is always 1. It does not determine whether the numbers have the same exponent - if they do not, the value computed by this function is meaningless.
        Parameters:
        num1 - the first number
        num2 - the second number
        Returns:
        the number of common most-significant mantissa bits

      • zeroLowerBits

        public static long zeroLowerBits​(long bits,
                                 int nBits)
        Zeroes the lower n bits of a bitstring.
        Parameters:
        bits - the bitstring to alter
        Returns:
        the zeroed bitstring

      • getBit

        public static int getBit​(long bits,
                         int i)
        Extracts the i'th bit of a bitstring.
        Parameters:
        bits - the bitstring to extract from
        i - the bit to extract
        Returns:
        the value of the extracted bit

      • add

        public void add​(double num)

      • getCommon

        public double getCommon​()

      • toString

        public java.lang.String toString​(long bits)
        A representation of the Double bits formatted for easy readability