Package org.omnifaces.utils

Class Collections

java.lang.Object

org.omnifaces.utils.Collections

public final class Collections
extends Object

Method Summary

Modifier and Type	Method	Description
static boolean	contains(Collection<?> collection, Object object)	Returns true if the collection is not null and contains the specified element.
static <E> List<E>	iterableToList(Iterable<E> iterable)	Converts an iterable into a list.
static <T> Map<T,T>	reverse(Map<T,T> source)	Returns a new map that contains the reverse of the given map.
static <E> Set<E>	unmodifiableSet(Object... values)	Creates an unmodifiable set based on the given values.

Methods inherited from class java.lang.Object

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

Method Detail

unmodifiableSet

public static <E> Set<E> unmodifiableSet(Object... values)

Creates an unmodifiable set based on the given values. If one of the values is an instance of an array or a collection, then each of its values will also be merged into the set. Nested arrays or collections will result in a ClassCastException.

Type Parameters:

E - The expected set element type.

Parameters:

values - The values to create an unmodifiable set for.

Returns:

An unmodifiable set based on the given values.

Throws:

ClassCastException - When one of the values or one of the arrays or collections is of wrong type.

iterableToList

public static <E> List<E> iterableToList(Iterable<E> iterable)

Converts an iterable into a list.

This method makes NO guarantee to whether changes to the source iterable are reflected in the returned list or not. For instance if the given iterable already is a list, it's returned directly.

Type Parameters:

E - The generic iterable element type.

Parameters:

iterable - The iterable to be converted.

Returns:

The list representation of the given iterable, possibly the same instance as that iterable.

reverse

public static <T> Map<T,T> reverse(Map<T,T> source)

Returns a new map that contains the reverse of the given map.

The reverse of a map means that every value X becomes a key X' with as corresponding value Y' the key Y that was originally associated with the value X.

Type Parameters:

T - The generic map key/value type.

Parameters:

source - the map that is to be reversed

Returns:

the reverse of the given map

contains

public static boolean contains(Collection<?> collection,
                               Object object)

Returns true if the collection is not null and contains the specified element.

Parameters:

collection - the collection to test for the specified element

object - element to test for in the specified collection

Returns:

true if the collection is not null and contains the specified element