org.eobjects.metamodel.util
Class CollectionUtils

java.lang.Object
  org.eobjects.metamodel.util.CollectionUtils

public final class CollectionUtils
extends Object

Various utility methods for handling of collections and arrays.

Author:

Kasper Sørensen

Method Summary

static <E> E[]	array(E[] existingArray, E... elements) Concatenates two arrays
static <E> E[]	arrayOf(Class<E> elementClass, Object arrayOrElement)
static <E> E[]	arrayRemove(E[] array, E elementToRemove)
static Object	arrayRemove(Object array, Object elementToRemove)
static <E> List<E>	concat(boolean removeDuplicates, Collection<? extends E> firstCollection, Collection<?>... collections)
static <E> List<E>	filter(E[] items, Predicate<? super E> predicate)
static <E> List<E>	filter(Iterable<E> items, Predicate<? super E> predicate)
static <E> void	forEach(E[] items, Action<? super E> action)
static <E> void	forEach(Iterable<E> items, Action<? super E> action)
static boolean	isNullOrEmpty(Collection<?> col)
static <E> boolean	isNullOrEmpty(E[] arr)
static <I,O> List<O>	map(I[] items, Func<? super I,O> func)
static <I,O> List<O>	map(Iterable<I> items, Func<? super I,O> func)
static List<?>	toList(Object obj) General purpose list converter method.

Methods inherited from class java.lang.Object

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

Method Detail

array

public static <E> E[] array(E[] existingArray,
                            E... elements)

Concatenates two arrays

Parameters:

existingArray - an existing array

elements - the elements to add to the end of it

Returns:

concat

public static <E> List<E> concat(boolean removeDuplicates,
                                 Collection<? extends E> firstCollection,
                                 Collection<?>... collections)

arrayRemove

public static <E> E[] arrayRemove(E[] array,
                                  E elementToRemove)

arrayRemove

public static Object arrayRemove(Object array,
                                 Object elementToRemove)

arrayOf

public static <E> E[] arrayOf(Class<E> elementClass,
                              Object arrayOrElement)

filter

public static <E> List<E> filter(E[] items,
                                 Predicate<? super E> predicate)

filter

public static <E> List<E> filter(Iterable<E> items,
                                 Predicate<? super E> predicate)

map

public static <I,O> List<O> map(I[] items,
                                Func<? super I,O> func)

map

public static <I,O> List<O> map(Iterable<I> items,
                                Func<? super I,O> func)

forEach

public static <E> void forEach(E[] items,
                               Action<? super E> action)

forEach

public static <E> void forEach(Iterable<E> items,
                               Action<? super E> action)

isNullOrEmpty

public static <E> boolean isNullOrEmpty(E[] arr)

isNullOrEmpty

public static boolean isNullOrEmpty(Collection<?> col)

toList

public static List<?> toList(Object obj)

General purpose list converter method. Will convert arrays, collections, iterables etc. into lists. If the argument is a single object (such as a String or a POJO) it will be wrapped in a single-element list. Null will be converted to the empty list.

Parameters:

obj - any object

Returns:

a list representation of the object