Package org.apache.logging.log4j.core.util

Class ArrayUtils

java.lang.Object
org.apache.logging.log4j.core.util.ArrayUtils
public class ArrayUtils extends Object
Copied from Apache Commons Lang (including the @since tags.)

  • Constructor Summary

    Constructors
    Constructor
    Description
    ArrayUtils()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    getLength(Object array)
    Returns the length of the specified array.
    static boolean
    isEmpty(byte[] array)
    Checks if an array of Objects is empty or null.
    static <T> T[]
    remove(T[] array, int index)
    Removes the element at the specified position from the specified array.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • ArrayUtils

      public ArrayUtils()

  • Method Details

    • isEmpty

      public static boolean isEmpty(byte[] array)
      Checks if an array of Objects is empty or null.
      Parameters:
      array - the array to test
      Returns:
      true if the array is empty or null
      Since:
      2.1

    • getLength

      public static int getLength(Object array)

      Returns the length of the specified array. This method can deal with Object arrays and with primitive arrays.

      If the input array is null, 0 is returned.

       ArrayUtils.getLength(null)            = 0
 ArrayUtils.getLength([])              = 0
 ArrayUtils.getLength([null])          = 1
 ArrayUtils.getLength([true, false])   = 2
 ArrayUtils.getLength([1, 2, 3])       = 3
 ArrayUtils.getLength(["a", "b", "c"]) = 3
      Parameters:
      array - the array to retrieve the length from, may be null
      Returns:
      The length of the array, or 0 if the array is null
      Throws:
      IllegalArgumentException - if the object argument is not an array.
      Since:
      2.1

    • remove

      public static <T> T[] remove(T[] array, int index)

      Removes the element at the specified position from the specified array. All subsequent elements are shifted to the left (subtracts one from their indices).

      This method returns a new array with the same elements of the input array except the element on the specified position. The component type of the returned array is always the same as that of the input array.

      If the input array is null, an IndexOutOfBoundsException will be thrown, because in that case no valid index can be specified.

       ArrayUtils.remove(["a"], 0)           = []
 ArrayUtils.remove(["a", "b"], 0)      = ["b"]
 ArrayUtils.remove(["a", "b"], 1)      = ["a"]
 ArrayUtils.remove(["a", "b", "c"], 1) = ["a", "c"]
      Type Parameters:
      T - the component type of the array
      Parameters:
      array - the array to remove the element from, may not be null
      index - the position of the element to be removed
      Returns:
      A new array containing the existing elements except the element at the specified position.
      Throws:
      IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= array.length), or if the array is null.
      Since:
      2.1