de.aristaflow.adept2.util

Class CollectionTools

java.lang.Object

de.aristaflow.adept2.util.CollectionTools

public final class CollectionTools
extends java.lang.Object

Tool methods for collections

Author:

Kevin Goeser

Method Summary

Modifier and Type	Method and Description
static <T> java.util.List<T>	removeNullElements(java.util.Collection<? extends T> coll) Gets a list reflecting the designated collection but without null elements.
static <K,V> java.util.Map<K,V>	replaceWithEmptyOrCopy(java.util.Map<K,V> map) Replaces an empty map by the EMPTY_MAP constant if its size is zero, or copies its contents into a new HashMap.

Methods inherited from class java.lang.Object

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

Method Detail

replaceWithEmptyOrCopy

public static <K,V> java.util.Map<K,V> replaceWithEmptyOrCopy(java.util.Map<K,V> map)

Replaces an empty map by the EMPTY_MAP constant if its size is zero, or copies its contents into a new HashMap.

Parameters:

map - The map to be either replaced by EMPTY_MAP or to be copied.

Returns:

The static EMPTY_MAP object or a fresh copy of the map's contents.

removeNullElements

public static <T> java.util.List<T> removeNullElements(java.util.Collection<? extends T> coll)

Gets a list reflecting the designated collection but without null elements. If the collection itself is null, null will be returned.

Parameters:

coll - The collection for which to get a list but without null elements.

Returns:

A list reflecting the designated collection but without null elements.