java.lang.Object
- java.util.AbstractCollection<E>
- - java.util.AbstractSet<E>
  - - org.apache.ignite.internal.util.GridSerializableSet<E>
    - - org.apache.ignite.internal.util.GridConcurrentSkipListSet<E>

All Implemented Interfaces:

Serializable, Cloneable, Iterable<E>, Collection<E>, NavigableSet<E>, Set<E>, SortedSet<E>

Direct Known Subclasses:

GridBoundedConcurrentOrderedSet
```
public class GridConcurrentSkipListSet<E>
extends GridSerializableSet<E>
implements NavigableSet<E>, Cloneable
```
This class provided the same logic as ConcurrentSkipListSet. It adds methods firstx() and lastx(), which unlike first() and last() methods return null for empty sets instead of throwing NoSuchElementException.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor	Description
`GridConcurrentSkipListSet()`	Constructs a new, empty set that orders its elements according to their natural ordering.
`GridConcurrentSkipListSet(Collection<? extends E> c)`	Constructs a new set containing the elements in the specified collection, that orders its elements according to their natural ordering.
`GridConcurrentSkipListSet(Comparator<? super E> comp)`	Constructs a new, empty set that orders its elements according to the specified comparator.
`GridConcurrentSkipListSet(SortedSet<E> s)`	Constructs a new set containing the same elements and using the same ordering as the specified sorted set.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`add(E e)`
`E`	`ceiling(E e)`
`void`	`clear()`
`GridConcurrentSkipListSet<E>`	`clone()`
`Comparator<? super E>`	`comparator()`
`boolean`	`contains(Object o)`
`Iterator<E>`	`descendingIterator()`
`NavigableSet<E>`	`descendingSet()`
`boolean`	`equals(Object o)`
`E`	`first()`
`E`	`firstx()`	Same as `first()`, but returns `null` if set is empty.
`E`	`floor(E e)`
`int`	`hashCode()`
`NavigableSet<E>`	`headSet(E toElement)`
`NavigableSet<E>`	`headSet(E toElement, boolean inclusive)`
`E`	`higher(E e)`
`boolean`	`isEmpty()`
`Iterator<E>`	`iterator()`
`E`	`last()`
`E`	`lastx()`	Same as `last()`, but returns `null` if set is empty.
`E`	`lower(E e)`
`E`	`pollFirst()`
`E`	`pollLast()`
`boolean`	`remove(Object o)`
`boolean`	`removeAll(Collection<?> c)`
`int`	`size()`
`NavigableSet<E>`	`subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)`
`NavigableSet<E>`	`subSet(E fromElement, E toElement)`
`NavigableSet<E>`	`tailSet(E fromElement)`
`NavigableSet<E>`	`tailSet(E fromElement, boolean inclusive)`

Methods inherited from class java.util.AbstractCollection
addAll, containsAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection
parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable
forEach

Methods inherited from interface java.util.Set
addAll, containsAll, retainAll, toArray, toArray

Methods inherited from interface java.util.SortedSet
spliterator

- Constructor Detail
  - GridConcurrentSkipListSet
```
public GridConcurrentSkipListSet()
```
    Constructs a new, empty set that orders its elements according to their natural ordering.
  - GridConcurrentSkipListSet
```
public GridConcurrentSkipListSet(Comparator<? super E> comp)
```
    Constructs a new, empty set that orders its elements according to the specified comparator.
    
    Parameters:
    
    comp - the comparator that will be used to order this set. If null, the natural ordering of the elements will be used.
  - GridConcurrentSkipListSet
```
public GridConcurrentSkipListSet(Collection<? extends E> c)
```
    Constructs a new set containing the elements in the specified collection, that orders its elements according to their natural ordering.
    
    Parameters:
    
    c - The elements that will comprise the new set
    
    Throws:
    
    ClassCastException - if the elements in c are not Comparable, or are not mutually comparable
    
    NullPointerException - if the specified collection or any of its elements are null
  - GridConcurrentSkipListSet
```
public GridConcurrentSkipListSet(SortedSet<E> s)
```
    Constructs a new set containing the same elements and using the same ordering as the specified sorted set.
    
    Parameters:
    
    s - sorted set whose elements will comprise the new set
    
    Throws:
    
    NullPointerException - if the specified sorted set or any of its elements are null
- Method Detail
  - clone
```
public GridConcurrentSkipListSet<E> clone()
```
    Overrides:
    
    clone in class Object
  - size
```
public int size()
```
    Specified by:
    
    size in interface Collection<E>
    
    Specified by:
    
    size in interface Set<E>
    
    Specified by:
    
    size in class AbstractCollection<E>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Collection<E>
    
    Specified by:
    
    isEmpty in interface Set<E>
    
    Overrides:
    
    isEmpty in class AbstractCollection<E>
  - contains
```
public boolean contains(Object o)
```
    Specified by:
    
    contains in interface Collection<E>
    
    Specified by:
    
    contains in interface Set<E>
    
    Overrides:
    
    contains in class AbstractCollection<E>
  - add
```
public boolean add(E e)
```
    Specified by:
    
    add in interface Collection<E>
    
    Specified by:
    
    add in interface Set<E>
    
    Overrides:
    
    add in class AbstractCollection<E>
  - remove
```
public boolean remove(Object o)
```
    Specified by:
    
    remove in interface Collection<E>
    
    Specified by:
    
    remove in interface Set<E>
    
    Overrides:
    
    remove in class AbstractCollection<E>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface Collection<E>
    
    Specified by:
    
    clear in interface Set<E>
    
    Overrides:
    
    clear in class AbstractCollection<E>
  - iterator
```
public Iterator<E> iterator()
```
    Specified by:
    
    iterator in interface Collection<E>
    
    Specified by:
    
    iterator in interface Iterable<E>
    
    Specified by:
    
    iterator in interface NavigableSet<E>
    
    Specified by:
    
    iterator in interface Set<E>
    
    Specified by:
    
    iterator in class AbstractCollection<E>
  - descendingIterator
```
public Iterator<E> descendingIterator()
```
    Specified by:
    
    descendingIterator in interface NavigableSet<E>
  - equals
```
public boolean equals(Object o)
```
    Specified by:
    
    equals in interface Collection<E>
    
    Specified by:
    
    equals in interface Set<E>
    
    Overrides:
    
    equals in class AbstractSet<E>
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Collection<E>
    
    Specified by:
    
    hashCode in interface Set<E>
    
    Overrides:
    
    hashCode in class AbstractSet<E>
  - removeAll
```
public boolean removeAll(Collection<?> c)
```
    Specified by:
    
    removeAll in interface Collection<E>
    
    Specified by:
    
    removeAll in interface Set<E>
    
    Overrides:
    
    removeAll in class AbstractSet<E>
  - lower
```
public E lower(E e)
```
    Specified by:
    
    lower in interface NavigableSet<E>
  - floor
```
public E floor(E e)
```
    Specified by:
    
    floor in interface NavigableSet<E>
  - ceiling
```
public E ceiling(E e)
```
    Specified by:
    
    ceiling in interface NavigableSet<E>
  - higher
```
public E higher(E e)
```
    Specified by:
    
    higher in interface NavigableSet<E>
  - pollFirst
```
@Nullable
public E pollFirst()
```
    Specified by:
    
    pollFirst in interface NavigableSet<E>
  - pollLast
```
@Nullable
public E pollLast()
```
    Specified by:
    
    pollLast in interface NavigableSet<E>
  - comparator
```
public Comparator<? super E> comparator()
```
    Specified by:
    
    comparator in interface SortedSet<E>
  - first
```
public E first()
```
    Specified by:
    
    first in interface SortedSet<E>
  - firstx
```
@Nullable
public E firstx()
```
    Same as first(), but returns null if set is empty.
    
    Returns:
    
    First entry or null if set is empty.
  - last
```
public E last()
```
    Specified by:
    
    last in interface SortedSet<E>
  - lastx
```
@Nullable
public E lastx()
```
    Same as last(), but returns null if set is empty.
    
    Returns:
    
    Last entry or null if set is empty.
  - subSet
```
public NavigableSet<E> subSet(E fromElement,
                              boolean fromInclusive,
                              E toElement,
                              boolean toInclusive)
```
    Specified by:
    
    subSet in interface NavigableSet<E>
  - headSet
```
public NavigableSet<E> headSet(E toElement,
                               boolean inclusive)
```
    Specified by:
    
    headSet in interface NavigableSet<E>
  - tailSet
```
public NavigableSet<E> tailSet(E fromElement,
                               boolean inclusive)
```
    Specified by:
    
    tailSet in interface NavigableSet<E>
  - subSet
```
public NavigableSet<E> subSet(E fromElement,
                              E toElement)
```
    Specified by:
    
    subSet in interface NavigableSet<E>
    
    Specified by:
    
    subSet in interface SortedSet<E>
  - headSet
```
public NavigableSet<E> headSet(E toElement)
```
    Specified by:
    
    headSet in interface NavigableSet<E>
    
    Specified by:
    
    headSet in interface SortedSet<E>
  - tailSet
```
public NavigableSet<E> tailSet(E fromElement)
```
    Specified by:
    
    tailSet in interface NavigableSet<E>
    
    Specified by:
    
    tailSet in interface SortedSet<E>
  - descendingSet
```
public NavigableSet<E> descendingSet()
```
    Specified by:
    
    descendingSet in interface NavigableSet<E>

Class GridConcurrentSkipListSet<E>

Constructor Summary

Method Summary

Methods inherited from class java.util.AbstractCollection

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Collection

Methods inherited from interface java.lang.Iterable

Methods inherited from interface java.util.Set

Methods inherited from interface java.util.SortedSet

Constructor Detail

GridConcurrentSkipListSet

GridConcurrentSkipListSet

GridConcurrentSkipListSet

GridConcurrentSkipListSet

Method Detail

clone

size

isEmpty

contains

add

remove

clear

iterator

descendingIterator

equals

hashCode

removeAll

lower

floor

ceiling

higher

pollFirst

pollLast

comparator

first

firstx

last

lastx

subSet

headSet

tailSet

subSet

headSet

tailSet

descendingSet