Netty 4.1.107.Final · io.netty.util.internal.MathUtil

Access	Constructor and Description
private	MathUtil()

Method Summary

Modifier and Type	Method and Description
public static int	Returns: the value `0` if `x == y`; `-1` if `x < y`; and `1` if `x > y` compare(final int the first `int` to compare x, final int the second `int` to compare y) Compares two `int` values.
public static int	Returns: 0 if `x == y` `> 0` if `x > y` `< 0` if `x < y` compare(long the first `long` to compare. x, long the second `long` to compare. y) Compare two `long` values.
public static int	Returns: The next power of 2 or the value itself if it is a power of 2 findNextPositivePowerOfTwo(final int from which to search for next power of 2 value) Fast method of finding the next power of 2 greater than or equal to the supplied value.
public static boolean	Returns: `false` if the requested `index` and `length` will fit within `capacity`. `true` if this would result in an index out of bounds exception. isOutOfBounds(int The starting index. index, int The length which will be utilized (starting from `index`). length, int The capacity that `index + length` is allowed to be within. capacity) Determine if the requested `index` and `length` will fit within `capacity`.
public static int	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 safeFindNextPositivePowerOfTwo(final int from which to search for next power of 2 value) Fast method of finding the next power of 2 greater than or equal to the supplied value.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

MathUtil	back to summary
private MathUtil()

Method Detail

compare back to summary

compare	back to summary
public static int compare(final int x, final int y) Compares two `int` values. Parameters x:int the first `int` to compare y:int the second `int` to compare Returns:int the value `0` if `x == y`; `-1` if `x < y`; and `1` if `x > y`

public static int compare(final int x, final int y)

Compares two int values.

Parameters

x:int: the first int to compare
y:int: the second int to compare

Returns:int

the value 0 if x == y; -1 if x < y; and 1 if x > y

compare back to summary

compare	back to summary
public static int compare(long x, long y) Compare two `long` values. Parameters x:long the first `long` to compare. y:long the second `long` to compare. Returns:int 0 if `x == y` `> 0` if `x > y` `< 0` if `x < y`

public static int compare(long x, long y)

Compare two long values.

Parameters

x:long: the first long to compare.
y:long: the second long to compare.

Returns:int

0 if x == y
> 0 if x > y
< 0 if x < y

findNextPositivePowerOfTwo back to summary

findNextPositivePowerOfTwo	back to summary
public static int findNextPositivePowerOfTwo(final 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:int from which to search for next power of 2 Returns:int The next power of 2 or the value itself if it is a power of 2

public static int findNextPositivePowerOfTwo(final 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:int: from which to search for next power of 2

Returns:int

The next power of 2 or the value itself if it is a power of 2

isOutOfBounds back to summary

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

public static boolean isOutOfBounds(int index, int length, int capacity)

Determine if the requested index and length will fit within capacity.

Parameters

index:int: The starting index.
length:int: The length which will be utilized (starting from index).
capacity:int: The capacity that index + length is allowed to be within.

Returns:boolean

false if the requested index and length will fit within capacity. true if this would result in an index out of bounds exception.

safeFindNextPositivePowerOfTwo back to summary

safeFindNextPositivePowerOfTwo	back to summary
public static int safeFindNextPositivePowerOfTwo(final 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:int from which to search for next power of 2 Returns:int 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

public static int safeFindNextPositivePowerOfTwo(final 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:int: from which to search for next power of 2

Returns:int

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

public final Class MathUtil

Constructor Summary

Method Summary

Constructor Detail

Method Detail