Package org.opendaylight.yangtools.util

Class LazyCollections

java.lang.Object

org.opendaylight.yangtools.util.LazyCollections

public final class LazyCollections
extends Object

Utility methods for lazily instantiated collections. These are useful for situations when we start off with an empty collection (where Collections.empty() * can be reused), but need to add more things.

Method Summary

Modifier and Type	Method	Description
static <E> List<E>	lazyAdd(List<E> list, E obj)	Add an element to a list, potentially transforming the list.
static <E> Set<E>	lazyAdd(Set<E> set, E obj)	Add an element to a set, potentially transforming the set.

Methods inherited from class java.lang.Object

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

Method Details

lazyAdd

public static <E> List<E> lazyAdd(List<E> list,
 E obj)

Add an element to a list, potentially transforming the list.

Type Parameters:

E - the type of elements in the list

Parameters:

list - Current list

obj - Object that needs to be added

Returns:

new list

lazyAdd

public static <E> Set<E> lazyAdd(Set<E> set,
 E obj)

Add an element to a set, potentially transforming the set.

Type Parameters:

E - the type of elements in the set

Parameters:

set - Current set

obj - Object that needs to be added

Returns:

new set