Class MathUtil

java.lang.Object
io.netty.util.internal.MathUtil
public final class MathUtil extends Object
Math utility methods.

  • Method Details

    • findNextPositivePowerOfTwo

      public static int findNextPositivePowerOfTwo(int value)
      Fast method of finding the next power of 2 greater than or equal to the supplied value.

      If the value is <= 0 then 1 will be returned. This method is not suitable for Integer.MIN_VALUE or numbers greater than 2^30.

      Parameters:
      value - from which to search for next power of 2
      Returns:
      The next power of 2 or the value itself if it is a power of 2

    • safeFindNextPositivePowerOfTwo

      public static int safeFindNextPositivePowerOfTwo(int value)
      Fast method of finding the next power of 2 greater than or equal to the supplied value.

      This method will do runtime bounds checking and call findNextPositivePowerOfTwo(int) if within a valid range.

      Parameters:
      value - from which to search for next power of 2
      Returns:
      The next power of 2 or the value itself if it is a power of 2.

      Special cases for return values are as follows:

      • <= 0 -> 1
      • >= 2^30 -> 2^30

    • isOutOfBounds

      public static boolean isOutOfBounds(int index, int length, int capacity)
      Determine if the requested index and length will fit within capacity.
      Parameters:
      index - The starting index.
      length - The length which will be utilized (starting from index).
      capacity - The capacity that index + length is allowed to be within.
      Returns:
      false if the requested index and length will fit within capacity. true if this would result in an index out of bounds exception.

    • compare

      @Deprecated public static int compare(int x, int y)
      Deprecated.
      not used anymore. User Integer.compare() instead. For removal. Compares two int values.
      Parameters:
      x - the first int to compare
      y - the second int to compare
      Returns:
      the value 0 if x == y; -1 if x < y; and 1 if x > y

    • compare

      @Deprecated public static int compare(long x, long y)
      Deprecated.
      not used anymore. User Long.compare() instead. For removal. Compare two long values.
      Parameters:
      x - the first long to compare.
      y - the second long to compare.
      Returns:
      • 0 if x == y
      • > 0 if x > y
      • < 0 if x < y