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java.lang.Object java.util.AbstractCollection<E> java.util.AbstractSet org.apache.openjpa.lib.util.concurrent.CopyOnWriteArraySet
public class CopyOnWriteArraySet
A Set
that uses an internal CopyOnWriteArrayList
for all of its operations. Thus, it shares the same basic properties:
class Handler { void handle(); ... } class X { private final CopyOnWriteArraySet<Handler> handlers = new CopyOnWriteArraySet<Handler>(); public void addHandler(Handler h) { handlers.add(h); } private long internalState; private synchronized void changeState() { internalState = ...; } public void update() { changeState(); for (Handler handler : handlers) handler.handle(); } }This class is a member of the Java Collections Framework.
CopyOnWriteArrayList
,
Serialized FormConstructor Summary | |
---|---|
CopyOnWriteArraySet()
Creates an empty set. |
|
CopyOnWriteArraySet(Collection c)
Creates a set containing all of the elements of the specified collection. |
Method Summary | |
---|---|
boolean |
add(Object e)
Adds the specified element to this set if it is not already present. |
boolean |
addAll(Collection c)
Adds all of the elements in the specified collection to this set if they're not already present. |
void |
clear()
Removes all of the elements from this set. |
boolean |
contains(Object o)
Returns true if this set contains the specified element. |
boolean |
containsAll(Collection c)
Returns true if this set contains all of the elements of the specified collection. |
boolean |
equals(Object o)
Compares the specified object with this set for equality. |
boolean |
isEmpty()
Returns true if this set contains no elements. |
Iterator |
iterator()
Returns an iterator over the elements contained in this set in the order in which these elements were added. |
boolean |
remove(Object o)
Removes the specified element from this set if it is present. |
boolean |
removeAll(Collection c)
Removes from this set all of its elements that are contained in the specified collection. |
boolean |
retainAll(Collection c)
Retains only the elements in this set that are contained in the specified collection. |
int |
size()
Returns the number of elements in this set. |
Object[] |
toArray()
Returns an array containing all of the elements in this set. |
Object[] |
toArray(Object[] a)
Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array. |
Methods inherited from class java.util.AbstractSet |
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hashCode |
Methods inherited from class java.util.AbstractCollection |
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toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public CopyOnWriteArraySet()
public CopyOnWriteArraySet(Collection c)
c
- the collection of elements to initially contain
NullPointerException
- if the specified collection is nullMethod Detail |
---|
public int size()
size
in interface Collection
size
in interface Set
size
in class AbstractCollection
public boolean isEmpty()
isEmpty
in interface Collection
isEmpty
in interface Set
isEmpty
in class AbstractCollection
public boolean contains(Object o)
contains
in interface Collection
contains
in interface Set
contains
in class AbstractCollection
o
- element whose presence in this set is to be tested
public Object[] toArray()
toArray
in interface Collection
toArray
in interface Set
public Object[] toArray(Object[] a)
toArray()
method, this method acts as bridge between
array-based and collection-based APIs. Further, this method allows
precise control over the runtime type of the output array, and may,
under certain circumstances, be used to save allocation costs.
Suppose x is a set known to contain only strings.
The following code can be used to dump the set into a newly allocated
array of String:
String[] y = x.toArray(new String[0]);Note that toArray(new Object[0]) is identical in function to toArray().
toArray
in interface Collection
toArray
in interface Set
a
- the array into which the elements of this set are to be
stored, if it is big enough; otherwise, a new array of the same
runtime type is allocated for this purpose.
ArrayStoreException
- if the runtime type of the specified array
is not a supertype of the runtime type of every element in this set
NullPointerException
- if the specified array is nullpublic void clear()
clear
in interface Collection
clear
in interface Set
clear
in class AbstractCollection
public boolean remove(Object o)
remove
in interface Collection
remove
in interface Set
remove
in class AbstractCollection
o
- object to be removed from this set, if present
public boolean add(Object e)
add
in interface Collection
add
in interface Set
add
in class AbstractCollection
e
- element to be added to this set
public boolean containsAll(Collection c)
containsAll
in interface Collection
containsAll
in interface Set
containsAll
in class AbstractCollection
c
- collection to be checked for containment in this set
NullPointerException
- if the specified collection is nullcontains(Object)
public boolean addAll(Collection c)
addAll
in interface Collection
addAll
in interface Set
addAll
in class AbstractCollection
c
- collection containing elements to be added to this set
NullPointerException
- if the specified collection is nulladd(Object)
public boolean removeAll(Collection c)
removeAll
in interface Collection
removeAll
in interface Set
removeAll
in class AbstractSet
c
- collection containing elements to be removed from this set
ClassCastException
- if the class of an element of this set
is incompatible with the specified collection(optional)
NullPointerException
- if this set contains a null element and the
specified collection does not permit null elements(optional),
or if the specified collection is nullremove(Object)
public boolean retainAll(Collection c)
retainAll
in interface Collection
retainAll
in interface Set
retainAll
in class AbstractCollection
c
- collection containing elements to be retained in this set
ClassCastException
- if the class of an element of this set
is incompatible with the specified collection(optional)
NullPointerException
- if this set contains a null element and the
specified collection does not permit null elements(optional),
or if the specified collection is nullremove(Object)
public Iterator iterator()
iterator
in interface Iterable
iterator
in interface Collection
iterator
in interface Set
iterator
in class AbstractCollection
public boolean equals(Object o)
true
if the specified object is the same object
as this object, or if it is also a Set
and the elements
returned by an iterator over the
specified set are the same as the elements returned by an
iterator over this set. More formally, the two iterators are
considered to return the same elements if they return the same
number of elements and for every element e1
returned by
the iterator over the specified set, there is an element
e2
returned by the iterator over this set such that
.
equals
in interface Collection
equals
in interface Set
equals
in class AbstractSet
o
- object to be compared for equality with this set
true
if the specified object is equal to this set
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