org.apache.ignite.internal.util

Class GridListSet<V>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

org.apache.ignite.internal.util.GridSerializableSet<V>

org.apache.ignite.internal.util.GridListSet<V>

All Implemented Interfaces:

Serializable, Cloneable, Iterable<V>, Collection<V>, Set<V>

public class GridListSet<V>
extends GridSerializableSet<V>
implements Cloneable

Implementation of Set based on internal list rather than hash table. The order of the internal list is either insertion order or defined by optionally provided Comparator.

Note that if 'strict' flag is false, then this set allows inconsistencies between Object.equals(Object) and Comparator.compare(Object, Object) methods. The equals(Object) method will always be used to determine final equality. This allows to have multiple elements for which compare(Object) method returns 0, but equals(Object) method returns false. The reverse is also true, where equals(Object) may return true, but compare(Object) method may return non-zero values.

In strict mode, which is default, Object.equals(Object) and Comparator.compare(Object, Object) methods must be absolutely consistent with each other.

This set does not allow null values.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GridListSet() Creates unsorted list set.
GridListSet(@Nullable Comparator<V> comp) If comparator is not null, then sorted list set will be created.
GridListSet(@Nullable Comparator<V> comp, boolean strict) If comparator is not null, then sorted list set will be created.
GridListSet(GridListSet<V> copy) Copy constructor.

Method Summary

Modifier and Type	Method and Description
boolean	add(V val)
V	addx(V val) Either adds a value to set or does nothing if value is already present.
protected Object	clone() Clones this set.
@Nullable Comparator<V>	comparator() Gets optional comparator for this set.
boolean	contains(Object val)
GridListSet<V>	copy() Creates a copy of this set.
V	first() Gets first element of this list.
V	get(int idx) Gets value at given index within internal list.
V	get(V val) Gets instance e stored in this set for which e.equals(val) returns true.
Iterator<V>	iterator()
V	last() Gets last element of this list.
boolean	remove(Object val)
V	removeFirst() Removes the first element of this list.
V	removeLast() Removes the last element of this list.
V	removex(V val) Removes given value from the set and returns the instance stored in the set or null if value was not found.
int	size()
boolean	strict() Gets value of strict flag for this set.
String	toString()
GridListSet<V>	toSynchronized() Creates a synchronized instance of this set.
List<V>	values() Gets a copy of the internal list.

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, clear, containsAll, isEmpty, retainAll, toArray, toArray

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

addAll, clear, containsAll, isEmpty, retainAll, spliterator, toArray, toArray

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

GridListSet

public GridListSet()

Creates unsorted list set. Values will be ordered in insertion order.

GridListSet

public GridListSet(@Nullable
                   @Nullable Comparator<V> comp)

If comparator is not null, then sorted list set will be created. Values will be sorted according to provided comparator.

Parameters:

comp - Optional comparator to sort values.

GridListSet

public GridListSet(@Nullable
                   @Nullable Comparator<V> comp,
                   boolean strict)

If comparator is not null, then sorted list set will be created. Values will be sorted according to provided comparator.

Parameters:

comp - Optional comparator to sort values.

strict - Strict flag.

GridListSet

public GridListSet(GridListSet<V> copy)

Copy constructor.

Parameters:

copy - Set to copy from.

Method Detail

strict

public boolean strict()

Gets value of strict flag for this set.

Returns:

Value of strict flag for this set.

comparator

@Nullable
public @Nullable Comparator<V> comparator()

Gets optional comparator for this set.

Returns:

Optional comparator for this set.

add

public boolean add(V val)

Specified by:

add in interface Collection<V>

Specified by:

add in interface Set<V>

Overrides:

add in class AbstractCollection<V>

addx

@Nullable
public V addx(V val)

Either adds a value to set or does nothing if value is already present.

Parameters:

val - Value to add.

Returns:

The instance of value from this set or null if value was added.

removeFirst

@Nullable
public V removeFirst()

Removes the first element of this list.

Returns:

Removed element or null if list is empty.

removeLast

@Nullable
public V removeLast()

Removes the last element of this list.

Returns:

Removed element or null if list is empty.

first

@Nullable
public V first()

Gets first element of this list.

Returns:

First element or null if list is empty.

last

@Nullable
public V last()

Gets last element of this list.

Returns:

Last element or null if list is empty.

remove

public boolean remove(Object val)

Specified by:

remove in interface Collection<V>

Specified by:

remove in interface Set<V>

Overrides:

remove in class AbstractCollection<V>

removex

@Nullable
public V removex(V val)

Removes given value from the set and returns the instance stored in the set or null if value was not found.

Parameters:

val - Value to remove.

Returns:

The instance that was stored in the set or null.

get

@Nullable
public V get(V val)

Gets instance e stored in this set for which e.equals(val) returns true.

Parameters:

val - Value to check for equality.

Returns:

Instance stored in this set for which e.equals(val) returns true.

get

public V get(int idx)

Gets value at given index within internal list. Note that this method will iterate through the list to get a value at the specified index.

Parameters:

idx - Index to get value at (must be non-negative and less than size()).

Returns:

Value at give index.

contains

public boolean contains(Object val)

Specified by:

contains in interface Collection<V>

Specified by:

contains in interface Set<V>

Overrides:

contains in class AbstractCollection<V>

copy

public GridListSet<V> copy()

Creates a copy of this set.

Returns:

Copy of this set.

iterator

public Iterator<V> iterator()

Specified by:

iterator in interface Iterable<V>

Specified by:

iterator in interface Collection<V>

Specified by:

iterator in interface Set<V>

Specified by:

iterator in class AbstractCollection<V>

size

public int size()

Specified by:

size in interface Collection<V>

Specified by:

size in interface Set<V>

Specified by:

size in class AbstractCollection<V>

values

public List<V> values()

Gets a copy of the internal list.

Returns:

Copy of the internal list.

clone

protected Object clone()
                throws CloneNotSupportedException

Clones this set.

Overrides:

clone in class Object

Returns:

Clone of this set.

Throws:

CloneNotSupportedException

toString

public String toString()

Overrides:

toString in class AbstractCollection<V>

toSynchronized

public GridListSet<V> toSynchronized()

Creates a synchronized instance of this set.

Returns:

Synchronized instance of this set.