MapBackedSet (OpenJPA Parent POM 3.2.1 API)

java.lang.Object
- org.apache.openjpa.lib.util.collections.MapBackedSet<E,V>

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, Set<E>
```
public final class MapBackedSet<E,V>
extends Object
implements Set<E>, Serializable
```
See Also:

Serialized Form

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`add(E obj)`
`boolean`	`addAll(Collection<? extends E> coll)`
`void`	`clear()`
`boolean`	`contains(Object obj)`
`boolean`	`containsAll(Collection<?> coll)`
`boolean`	`equals(Object obj)`
`int`	`hashCode()`
`boolean`	`isEmpty()`
`Iterator<E>`	`iterator()`
`static <E,V> MapBackedSet<E,V>`	`mapBackedSet(Map<E,? super V> map)` Factory method to create a set from a map.
`static <E,V> MapBackedSet<E,V>`	`mapBackedSet(Map<E,? super V> map, V dummyValue)` Factory method to create a set from a map.
`boolean`	`remove(Object obj)`
`boolean`	`removeAll(Collection<?> coll)`
`boolean`	`removeIf(Predicate<? super E> filter)`
`boolean`	`retainAll(Collection<?> coll)`
`int`	`size()`
`Object[]`	`toArray()`
`<T> T[]`	`toArray(T[] array)`

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

Methods inherited from interface java.util.Set
spliterator

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

Methods inherited from interface java.lang.Iterable
forEach

- Method Detail
  - mapBackedSet
```
public static <E,V> MapBackedSet<E,V> mapBackedSet(Map<E,? super V> map)
```
    Factory method to create a set from a map.
    
    Type Parameters:
    
    E - the element type
    
    V - the dummy value type in the map
    
    Parameters:
    
    map - the map to decorate, must not be null
    
    Returns:
    
    a new map backed set
    
    Throws:
    
    NullPointerException - if map is null
    
    Since:
    
    4.0
  - mapBackedSet
```
public static <E,V> MapBackedSet<E,V> mapBackedSet(Map<E,? super V> map,
                                                   V dummyValue)
```
    Factory method to create a set from a map.
    
    Type Parameters:
    
    E - the element type
    
    V - the dummy value type in the map
    
    Parameters:
    
    map - the map to decorate, must not be null
    
    dummyValue - the dummy value to use
    
    Returns:
    
    a new map backed set
    
    Throws:
    
    NullPointerException - if map is null
    
    Since:
    
    4.0
  - size
```
public int size()
```
    Specified by:
    
    size in interface Collection<E>
    
    Specified by:
    
    size in interface Set<E>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Collection<E>
    
    Specified by:
    
    isEmpty in interface Set<E>
  - iterator
```
public Iterator<E> iterator()
```
    Specified by:
    
    iterator in interface Iterable<E>
    
    Specified by:
    
    iterator in interface Collection<E>
    
    Specified by:
    
    iterator in interface Set<E>
  - contains
```
public boolean contains(Object obj)
```
    Specified by:
    
    contains in interface Collection<E>
    
    Specified by:
    
    contains in interface Set<E>
  - containsAll
```
public boolean containsAll(Collection<?> coll)
```
    Specified by:
    
    containsAll in interface Collection<E>
    
    Specified by:
    
    containsAll in interface Set<E>
  - add
```
public boolean add(E obj)
```
    Specified by:
    
    add in interface Collection<E>
    
    Specified by:
    
    add in interface Set<E>
  - addAll
```
public boolean addAll(Collection<? extends E> coll)
```
    Specified by:
    
    addAll in interface Collection<E>
    
    Specified by:
    
    addAll in interface Set<E>
  - remove
```
public boolean remove(Object obj)
```
    Specified by:
    
    remove in interface Collection<E>
    
    Specified by:
    
    remove in interface Set<E>
  - removeIf
```
public boolean removeIf(Predicate<? super E> filter)
```
    Specified by:
    
    removeIf in interface Collection<E>
    
    Since:
    
    4.4
  - removeAll
```
public boolean removeAll(Collection<?> coll)
```
    Specified by:
    
    removeAll in interface Collection<E>
    
    Specified by:
    
    removeAll in interface Set<E>
  - retainAll
```
public boolean retainAll(Collection<?> coll)
```
    Specified by:
    
    retainAll in interface Collection<E>
    
    Specified by:
    
    retainAll in interface Set<E>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface Collection<E>
    
    Specified by:
    
    clear in interface Set<E>
  - toArray
```
public Object[] toArray()
```
    Specified by:
    
    toArray in interface Collection<E>
    
    Specified by:
    
    toArray in interface Set<E>
  - toArray
```
public <T> T[] toArray(T[] array)
```
    Specified by:
    
    toArray in interface Collection<E>
    
    Specified by:
    
    toArray in interface Set<E>
  - equals
```
public boolean equals(Object obj)
```
    Specified by:
    
    equals in interface Collection<E>
    
    Specified by:
    
    equals in interface Set<E>
    
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Collection<E>
    
    Specified by:
    
    hashCode in interface Set<E>
    
    Overrides:
    
    hashCode in class Object

Class MapBackedSet<E,V>

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Set

Methods inherited from interface java.util.Collection

Methods inherited from interface java.lang.Iterable

Method Detail

mapBackedSet

mapBackedSet

size

isEmpty

iterator

contains

containsAll

add

addAll

remove

removeIf

removeAll

retainAll

clear

toArray

toArray

equals

hashCode