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java.lang.Objectjava.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 Form| Constructor Summary | |
|---|---|
CopyOnWriteArraySet()
Creates an empty set. |
|
CopyOnWriteArraySet(java.util.Collection c)
Creates a set containing all of the elements of the specified collection. |
|
| Method Summary | |
|---|---|
boolean |
add(java.lang.Object e)
Adds the specified element to this set if it is not already present. |
boolean |
addAll(java.util.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(java.lang.Object o)
Returns true if this set contains the specified element. |
boolean |
containsAll(java.util.Collection c)
Returns true if this set contains all of the elements of the specified collection. |
boolean |
equals(java.lang.Object o)
Compares the specified object with this set for equality. |
boolean |
isEmpty()
Returns true if this set contains no elements. |
java.util.Iterator |
iterator()
Returns an iterator over the elements contained in this set in the order in which these elements were added. |
boolean |
remove(java.lang.Object o)
Removes the specified element from this set if it is present. |
boolean |
removeAll(java.util.Collection c)
Removes from this set all of its elements that are contained in the specified collection. |
boolean |
retainAll(java.util.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. |
java.lang.Object[] |
toArray()
Returns an array containing all of the elements in this set. |
java.lang.Object[] |
toArray(java.lang.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 |
|---|
hashCode |
| Methods inherited from class java.util.AbstractCollection |
|---|
toString |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public CopyOnWriteArraySet()
public CopyOnWriteArraySet(java.util.Collection c)
c - the collection of elements to initially contain
java.lang.NullPointerException - if the specified collection is null| Method Detail |
|---|
public int size()
size in interface java.util.Collectionsize in interface java.util.Setsize in class java.util.AbstractCollectionpublic boolean isEmpty()
isEmpty in interface java.util.CollectionisEmpty in interface java.util.SetisEmpty in class java.util.AbstractCollectionpublic boolean contains(java.lang.Object o)
contains in interface java.util.Collectioncontains in interface java.util.Setcontains in class java.util.AbstractCollectiono - element whose presence in this set is to be tested
public java.lang.Object[] toArray()
toArray in interface java.util.CollectiontoArray in interface java.util.Setpublic java.lang.Object[] toArray(java.lang.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 java.util.CollectiontoArray in interface java.util.Seta - 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.
java.lang.ArrayStoreException - if the runtime type of the specified array
is not a supertype of the runtime type of every element in this set
java.lang.NullPointerException - if the specified array is nullpublic void clear()
clear in interface java.util.Collectionclear in interface java.util.Setclear in class java.util.AbstractCollectionpublic boolean remove(java.lang.Object o)
remove in interface java.util.Collectionremove in interface java.util.Setremove in class java.util.AbstractCollectiono - object to be removed from this set, if present
public boolean add(java.lang.Object e)
add in interface java.util.Collectionadd in interface java.util.Setadd in class java.util.AbstractCollectione - element to be added to this set
public boolean containsAll(java.util.Collection c)
containsAll in interface java.util.CollectioncontainsAll in interface java.util.SetcontainsAll in class java.util.AbstractCollectionc - collection to be checked for containment in this set
java.lang.NullPointerException - if the specified collection is nullcontains(Object)public boolean addAll(java.util.Collection c)
addAll in interface java.util.CollectionaddAll in interface java.util.SetaddAll in class java.util.AbstractCollectionc - collection containing elements to be added to this set
java.lang.NullPointerException - if the specified collection is nulladd(Object)public boolean removeAll(java.util.Collection c)
removeAll in interface java.util.CollectionremoveAll in interface java.util.SetremoveAll in class java.util.AbstractSetc - collection containing elements to be removed from this set
java.lang.ClassCastException - if the class of an element of this set
is incompatible with the specified collection(optional)
java.lang.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(java.util.Collection c)
retainAll in interface java.util.CollectionretainAll in interface java.util.SetretainAll in class java.util.AbstractCollectionc - collection containing elements to be retained in this set
java.lang.ClassCastException - if the class of an element of this set
is incompatible with the specified collection(optional)
java.lang.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 java.util.Iterator iterator()
iterator in interface java.lang.Iterableiterator in interface java.util.Collectioniterator in interface java.util.Setiterator in class java.util.AbstractCollectionpublic boolean equals(java.lang.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 java.util.Collectionequals in interface java.util.Setequals in class java.util.AbstractSeto - object to be compared for equality with this set
true if the specified object is equal to this set
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