io.micronaut.core.util

Class ArrayUtils

java.lang.Object

io.micronaut.core.util.ArrayUtils

public class ArrayUtils
extends java.lang.Object

Utility methods for working with arrays.

Since:

1.0

Author:

Graeme Rocher

Field Summary

Fields

Modifier and Type	Field and Description
static boolean[]	EMPTY_BOOLEAN_ARRAY An empty boolean array.
static byte[]	EMPTY_BYTE_ARRAY An empty byte array.
static char[]	EMPTY_CHAR_ARRAY An empty char array.
static double[]	EMPTY_DOUBLE_ARRAY An empty double array.
static float[]	EMPTY_FLOAT_ARRAY An empty float array.
static int[]	EMPTY_INT_ARRAY An empty int array.
static long[]	EMPTY_LONG_ARRAY An empty long array.
static java.lang.Object[]	EMPTY_OBJECT_ARRAY An empty object array.
static short[]	EMPTY_SHORT_ARRAY An empty short array.

Constructor Summary

Constructors

Constructor and Description
ArrayUtils()

Method Summary

Modifier and Type	Method and Description
static byte[]	concat(byte[] a, byte... b) Concatenate two byte arrays.
static <T> T[]	concat(T[] a, T... b) Concatenate two arrays.
static boolean	isEmpty(java.lang.Object[] array) Whether the given array is empty.
static boolean	isNotEmpty(java.lang.Object[] array) Whether the given array is not empty.
static <T> java.util.Iterator<T>	iterator(T... array) Produce an iterator for the given array.
static <T> java.util.Iterator<T>	reverseIterator(T... array) Produce an iterator for the given array.
static <T> T[]	toArray(java.util.Collection<T> collection, java.lang.Class<T> arrayItemClass) Returns an array containing all of the elements in this collection, using the item class.
static <T> T[]	toArray(java.util.Collection<T> collection, java.util.function.IntFunction<T[]> createArrayFn) Returns an array containing all of the elements in this collection, using the provided generator function to allocate the returned array.
static java.lang.Object	toPrimitiveArray(java.lang.Object[] wrapperArray) Converts a primitive wrapper array to the equivalent primitive array such as Integer[] to int[].
static java.lang.String	toString(java.lang.Object[] array) Produce a string representation of the given array.
static java.lang.String	toString(java.lang.String delimiter, java.lang.Object[] array) Produce a string representation of the given array.
static java.lang.Object[]	toWrapperArray(java.lang.Object primitiveArray) Converts a primitive array to the equivalent wrapper such as int[] to Integer[].

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_OBJECT_ARRAY

public static final java.lang.Object[] EMPTY_OBJECT_ARRAY

An empty object array.

EMPTY_BOOLEAN_ARRAY

public static final boolean[] EMPTY_BOOLEAN_ARRAY

An empty boolean array.

EMPTY_BYTE_ARRAY

public static final byte[] EMPTY_BYTE_ARRAY

An empty byte array.

EMPTY_CHAR_ARRAY

public static final char[] EMPTY_CHAR_ARRAY

An empty char array.

EMPTY_INT_ARRAY

public static final int[] EMPTY_INT_ARRAY

An empty int array.

EMPTY_DOUBLE_ARRAY

public static final double[] EMPTY_DOUBLE_ARRAY

An empty double array.

EMPTY_LONG_ARRAY

public static final long[] EMPTY_LONG_ARRAY

An empty long array.

EMPTY_FLOAT_ARRAY

public static final float[] EMPTY_FLOAT_ARRAY

An empty float array.

EMPTY_SHORT_ARRAY

public static final short[] EMPTY_SHORT_ARRAY

An empty short array.

Constructor Detail

ArrayUtils

public ArrayUtils()

Method Detail

concat

public static <T> T[] concat(T[] a,
                             T... b)

Concatenate two arrays.

Type Parameters:

T - The array type

Parameters:

a - The first array

b - The second array

Returns:

The concatenated array

concat

public static byte[] concat(byte[] a,
                            byte... b)

Concatenate two byte arrays.

Parameters:

a - The first array

b - The second array

Returns:

The concatenated array

isEmpty

public static boolean isEmpty(java.lang.Object[] array)

Whether the given array is empty.

Parameters:

array - The array

Returns:

True if it is

isNotEmpty

public static boolean isNotEmpty(java.lang.Object[] array)

Whether the given array is not empty.

Parameters:

array - The array

Returns:

True if it is

toString

public static java.lang.String toString(@Nullable
                                        java.lang.Object[] array)

Produce a string representation of the given array.

Parameters:

array - The array

Returns:

The string representation

toString

public static java.lang.String toString(java.lang.String delimiter,
                                        @Nullable
                                        java.lang.Object[] array)

Produce a string representation of the given array.

Parameters:

delimiter - The delimiter

array - The array

Returns:

The string representation

iterator

public static <T> java.util.Iterator<T> iterator(T... array)

Produce an iterator for the given array.

Type Parameters:

T - The array type

Parameters:

array - The array

Returns:

The iterator

reverseIterator

public static <T> java.util.Iterator<T> reverseIterator(T... array)

Produce an iterator for the given array.

Type Parameters:

T - The array type

Parameters:

array - The array

Returns:

The iterator

toArray

public static <T> T[] toArray(java.util.Collection<T> collection,
                              java.util.function.IntFunction<T[]> createArrayFn)

Returns an array containing all of the elements in this collection, using the provided generator function to allocate the returned array.

Type Parameters:

T - The type of the array

Parameters:

collection - The collection

createArrayFn - The function to create the array

Returns:

The array

toArray

public static <T> T[] toArray(java.util.Collection<T> collection,
                              java.lang.Class<T> arrayItemClass)

Returns an array containing all of the elements in this collection, using the item class.

Type Parameters:

T - The type of the array

Parameters:

collection - The collection

arrayItemClass - The array item class

Returns:

The array

Since:

3.0

toWrapperArray

public static java.lang.Object[] toWrapperArray(java.lang.Object primitiveArray)

Converts a primitive array to the equivalent wrapper such as int[] to Integer[].

Parameters:

primitiveArray - The primitive array

Returns:

The primitive array wrapper.

Since:

3.0.0

toPrimitiveArray

public static java.lang.Object toPrimitiveArray(java.lang.Object[] wrapperArray)

Converts a primitive wrapper array to the equivalent primitive array such as Integer[] to int[].

Parameters:

wrapperArray - The wrapper array

Returns:

The primitive array.

Since:

3.0.0