Module org.apache.jena.base
Package org.apache.jena.atlas.lib

Class BitsInt

java.lang.Object
org.apache.jena.atlas.lib.BitsInt
public final class BitsInt extends Object
Utilities for manipulating a bit pattern which are held in a 32 bit int. Bits are numbered 0 to 31. Bit 0 is the low bit of the int, and bit 31 the sign bit of the long.
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    static final int
    access(int bits, int start, int finish)
    Get the bits from start (inclusive) to finish (exclusive), leaving them aligned in the int.
    static final int
    clear(int bits, int bitIndex)
    Clear the bit specified.
    static final int
    clear(int bits, int start, int finish)
    Clear the bits specified.
    static final boolean
    isSet(int bits, int bitIndex)
    Test whether a bit is set
    static final int
    mask(int start, int finish)
    Create a mask that has ones between bit positions start (inc) and finish (exc), and zeros elsewhere.
    static final int
    maskZero(int start, int finish)
    Create a mask that has zeros between bit positions start (inc) and finish (exc), and ones elsewhere
    static final int
    pack(int bits, int value, int start, int finish)
    Place the value into the bit pattern between start and finish and returns the new int.
    static final int
    set(int bits, int bitIndex)
    Set the bits specified.
    static final int
    set(int bits, int start, int finish)
    Set the bits from start (inc) to finish (exc) to one
    static final boolean
    test(int bits, boolean isSet, int bitIndex)
    Test whether a bit is the same as isSet
    static final boolean
    test(int bits, int value, int start, int finish)
    Test whether a range has a specific value or not
    static final int
    unpack(int bits, int start, int finish)
    Extract the value packed into bits start (inclusive) and finish (exclusive).
    static final int
    unpack(String str, int startChar, int finishChar)
    Get bits from a hex string.

    Methods inherited from class java.lang.Object

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

  • Method Details

    • unpack

      public static final int unpack(int bits, int start, int finish)
      Extract the value packed into bits start (inclusive) and finish (exclusive). The value is returned in the low part of the returned int. The low bit is bit zero.
      Parameters:
      bits -
      start -
      finish -
      Returns:
      int

    • pack

      public static final int pack(int bits, int value, int start, int finish)
      Place the value into the bit pattern between start and finish and returns the new int. Leaves other bits alone.
      Parameters:
      bits -
      value -
      start -
      finish -
      Returns:
      int

    • unpack

      public static final int unpack(String str, int startChar, int finishChar)
      Get bits from a hex string.
      Parameters:
      str -
      startChar - Index of first character (counted from the left, string style).
      finishChar - Index after the last character (counted from the left, string style).
      Returns:
      int
      See Also:

    • set

      public static final int set(int bits, int bitIndex)
      Set the bits specified.
      Parameters:
      bits - Pattern
      bitIndex -
      Returns:
      Modified pattern

    • set

      public static final int set(int bits, int start, int finish)
      Set the bits from start (inc) to finish (exc) to one
      Parameters:
      bits - Pattern
      start - start (inclusive)
      finish - finish (exclusive)
      Returns:
      Modified pattern

    • test

      public static final boolean test(int bits, boolean isSet, int bitIndex)
      Test whether a bit is the same as isSet
      Parameters:
      bits - Pattern
      isSet - Test whether is set or not.
      bitIndex - Bit index
      Returns:
      Boolean

    • isSet

      public static final boolean isSet(int bits, int bitIndex)
      Test whether a bit is set
      Parameters:
      bits - Pattern
      bitIndex - Bit index
      Returns:
      Boolean

    • test

      public static final boolean test(int bits, int value, int start, int finish)
      Test whether a range has a specific value or not
      Parameters:
      bits - Pattern
      value - Value to test for
      start - start (inclusive)
      finish - finish (exclusive)
      Returns:
      Boolean

    • access

      public static final int access(int bits, int start, int finish)
      Get the bits from start (inclusive) to finish (exclusive), leaving them aligned in the int. See also unpack(int, int, int) which returns the value found at that place.
      Parameters:
      bits -
      start -
      finish -
      Returns:
      int
      See Also:

    • clear

      public static final int clear(int bits, int bitIndex)
      Clear the bit specified.
      Parameters:
      bits -
      bitIndex -
      Returns:
      int

    • clear

      public static final int clear(int bits, int start, int finish)
      Clear the bits specified.
      Parameters:
      bits -
      start -
      finish -
      Returns:
      int

    • mask

      public static final int mask(int start, int finish)
      Create a mask that has ones between bit positions start (inc) and finish (exc), and zeros elsewhere.
      Parameters:
      start -
      finish -
      Returns:
      int

    • maskZero

      public static final int maskZero(int start, int finish)
      Create a mask that has zeros between bit positions start (inc) and finish (exc), and ones elsewhere
      Parameters:
      start -
      finish -
      Returns:
      int