Package org.okkam.awesome.utils

Class OkkamSets

java.lang.Object

org.okkam.awesome.utils.OkkamSets

public class OkkamSets
extends Object

Method Summary

Modifier and Type	Method	Description
static <T> Set<T>	addIfNotNull(Set<T> set, T element)	Add if not empty.
static <T> Set<T>	addSafeToHashSet(Set<T> set, T... elements)	Add elements to the HashSet.
static <T> Set<T>	createHashSetIfNull(Set<T> set)	Create an HashSet if the Set is null.

Methods inherited from class java.lang.Object

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

Method Detail

addIfNotNull

public static <T> Set<T> addIfNotNull(Set<T> set,
                                      T element)

Add if not empty.

Type Parameters:

T - The Set and element type

Parameters:

set - The input set

element - The element to add

Returns:

The null set or the input one

createHashSetIfNull

public static <T> Set<T> createHashSetIfNull(Set<T> set)

Create an HashSet if the Set is null.

Type Parameters:

T - The Set type

Parameters:

set - The input set

Returns:

The empty set or the input one.

addSafeToHashSet

@SafeVarargs
public static <T> Set<T> addSafeToHashSet(Set<T> set,
                                          T... elements)

Add elements to the HashSet. Create a new HashSet if the Set is null (initialized with elements).

Type Parameters:

T - The Set type

Parameters:

set - The input set

elements - The elements to add

Returns:

The set initialized with elements (if empty) or the input one adding elements.