com.github.wuic.util

Class CollectionUtils

java.lang.Object

com.github.wuic.util.CollectionUtils

public final class CollectionUtils
extends Object

Utility class built on top of the java collection framework helping WUIC to deal with collections.

Since:

0.3.1

Version:

1.2

Author:

Guillaume DROUET

Field Summary

Fields

Modifier and Type	Field and Description
static List<String>	EMPTY_STRING_LIST Empty List typed with String.

Method Summary

Methods

Modifier and Type	Method and Description
static int	deepHashCode(Object... objects) Just the varargs version of Arrays.deepHashCode(Object[])
static <T> Set<T>	difference(Set<T> first, Set<T> second) Returns a set containing all the elements which are not contained by the two given sets.
static int	indexOf(Object target, Object... elements) Gets the index of a targetted element in a specified array.
static <T> List<T>	newList(T... elements) Returns a List with a initial capacity which equals to the number of elements given in parameter and with those elements already added.
static <K,V> Map<K,V>	orderedKeyMap() Returns a Map that keep the orders of its keys.
static <T> void	without(T[] source, T[] target, int... exclusions) Returns an array without the element at given indexes.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_STRING_LIST

public static final List<String> EMPTY_STRING_LIST

Empty List typed with String.

Method Detail

without

public static <T> void without(T[] source,
               T[] target,
               int... exclusions)

Returns an array without the element at given indexes.

Parameters:

source - the source array

target - array to recopy (length should equals source.length - exclusions.length)

exclusions - the indexes to exclude (must appear in natural order)

orderedKeyMap

public static <K,V> Map<K,V> orderedKeyMap()

Returns a Map that keep the orders of its keys.

Type Parameters:

K - the type of the key

V - the type of the value

Returns:

the map

newList

public static <T> List<T> newList(T... elements)

Returns a List with a initial capacity which equals to the number of elements given in parameter and with those elements already added.

Type Parameters:

T - the generic of the list

Parameters:

elements - the elements to add to the list to create

Returns:

the creates List

difference

public static <T> Set<T> difference(Set<T> first,
                    Set<T> second)

Returns a set containing all the elements which are not contained by the two given sets.

Type Parameters:

T - the type of element

Parameters:

first - the first set

second - the second set

Returns:

the difference between two sets

deepHashCode

public static int deepHashCode(Object... objects)

Just the varargs version of Arrays.deepHashCode(Object[])

Parameters:

objects - the array to compute hash code

Returns:

the hash code returned by Arrays.deepHashCode(Object[])

indexOf

public static int indexOf(Object target,
          Object... elements)

Gets the index of a targetted element in a specified array.

Parameters:

target - the element to search

elements - the array

Returns:

the index of the element in the array, -1 if not found