net.i2p.router.crypto.ratchet

Class GrowingArrayUtils

java.lang.Object

net.i2p.router.crypto.ratchet.GrowingArrayUtils

final class GrowingArrayUtils
extends Object

A helper class that aims to provide comparable growth performance to ArrayList, but on primitive arrays. Common array operations are implemented for efficient use in dynamic containers. All methods in this class assume that the length of an array is equivalent to its capacity and NOT the number of elements in the array. The current size of the array is always passed in as a parameter.

Method Summary

Modifier and Type	Method and Description
static char[]	append(char[] array, int currentSize, char element) Primitive char version of append(Object[], int, Object).
static <T> T[]	append(T[] array, int currentSize, T element) Appends an element to the end of the array, growing the array if there is no more room.
static int	growSize(int currentSize) Given the current size of an array, returns an ideal size to which the array should grow.
static char[]	insert(char[] array, int currentSize, int index, char element) Primitive char version of insert(Object[], int, int, Object).
static <T> T[]	insert(T[] array, int currentSize, int index, T element) Inserts an element into the array at the specified index, growing the array if there is no more room.

Methods inherited from class java.lang.Object

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

Method Detail

append

public static <T> T[] append(T[] array,
                             int currentSize,
                             T element)

Appends an element to the end of the array, growing the array if there is no more room.

Parameters:

array - The array to which to append the element. This must NOT be null.

currentSize - The number of elements in the array. Must be less than or equal to array.length.

element - The element to append.

Returns:

the array to which the element was appended. This may be different than the given array.

append

public static char[] append(char[] array,
                            int currentSize,
                            char element)

Primitive char version of append(Object[], int, Object).

insert

public static <T> T[] insert(T[] array,
                             int currentSize,
                             int index,
                             T element)

Inserts an element into the array at the specified index, growing the array if there is no more room.

Parameters:

array - The array to which to append the element. Must NOT be null.

currentSize - The number of elements in the array. Must be less than or equal to array.length.

element - The element to insert.

Returns:

the array to which the element was appended. This may be different than the given array.

insert

public static char[] insert(char[] array,
                            int currentSize,
                            int index,
                            char element)

Primitive char version of insert(Object[], int, int, Object).

growSize

public static int growSize(int currentSize)

Given the current size of an array, returns an ideal size to which the array should grow. This is typically double the given size, but should not be relied upon to do so in the future.