public abstract class AbstractCollectionDecorator extends Object implements Collection
Collection
to provide additional behaviour.
Each method call made on this Collection
is forwarded to the
decorated Collection
. This class is used as a framework on which
to build to extensions such as synchronized and unmodifiable behaviour. The
main advantage of decoration is that one decorator can wrap any implementation
of Collection
, whereas sub-classing requires a new class to be
written for each implementation.
This implementation does not perform any special processing with
iterator()
. Instead it simply returns the value from the
wrapped collection. This may be undesirable, for example if you are trying
to write an unmodifiable implementation it might provide a loophole.
Modifier and Type | Field and Description |
---|---|
protected Collection |
collection
The collection being decorated
|
Modifier | Constructor and Description |
---|---|
protected |
AbstractCollectionDecorator()
Constructor only used in deserialization, do not use otherwise.
|
protected |
AbstractCollectionDecorator(Collection coll)
Constructor that wraps (not copies).
|
Modifier and Type | Method and Description |
---|---|
boolean |
add(Object object) |
boolean |
addAll(Collection coll) |
void |
clear() |
boolean |
contains(Object object) |
boolean |
containsAll(Collection coll) |
boolean |
equals(Object object) |
protected Collection |
getCollection()
Gets the collection being decorated.
|
int |
hashCode() |
boolean |
isEmpty() |
Iterator |
iterator() |
boolean |
remove(Object object) |
boolean |
removeAll(Collection coll) |
boolean |
retainAll(Collection coll) |
int |
size() |
Object[] |
toArray() |
Object[] |
toArray(Object[] object) |
String |
toString() |
protected Collection collection
protected AbstractCollectionDecorator()
protected AbstractCollectionDecorator(Collection coll)
coll
- the collection to decorate, must not be nullIllegalArgumentException
- if the collection is nullprotected Collection getCollection()
public boolean add(Object object)
add
in interface Collection
public boolean addAll(Collection coll)
addAll
in interface Collection
public void clear()
clear
in interface Collection
public boolean contains(Object object)
contains
in interface Collection
public boolean isEmpty()
isEmpty
in interface Collection
public Iterator iterator()
iterator
in interface Iterable
iterator
in interface Collection
public boolean remove(Object object)
remove
in interface Collection
public int size()
size
in interface Collection
public Object[] toArray()
toArray
in interface Collection
public Object[] toArray(Object[] object)
toArray
in interface Collection
public boolean containsAll(Collection coll)
containsAll
in interface Collection
public boolean removeAll(Collection coll)
removeAll
in interface Collection
public boolean retainAll(Collection coll)
retainAll
in interface Collection
public boolean equals(Object object)
equals
in interface Collection
equals
in class Object
public int hashCode()
hashCode
in interface Collection
hashCode
in class Object
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