com.google.common.collect
Class ForwardingCollection<E>
java.lang.Object
com.google.common.collect.ForwardingObject
com.google.common.collect.ForwardingCollection<E>
- All Implemented Interfaces:
- Iterable<E>, Collection<E>
- Direct Known Subclasses:
- ForwardingList, ForwardingMultiset, ForwardingQueue, ForwardingSet
public abstract class ForwardingCollection<E>
- extends ForwardingObject
- implements Collection<E>
A collection which forwards all its method calls to another collection.
Subclasses should override one or more methods to modify the behavior of
the backing collection as desired per the decorator pattern.
- Author:
- Kevin Bourrillion
- See Also:
ForwardingObject
ForwardingCollection
public ForwardingCollection()
delegate
protected abstract Collection<E> delegate()
- Description copied from class:
ForwardingObject
- Returns the backing delegate instance that methods are forwarded to.
Abstract subclasses generally override the
ForwardingObject
method
with an abstract method that has a more specific return type, such as
ForwardingSet.delegate()
. Concrete subclasses override this method to
supply the instance being decorated.
- Specified by:
delegate
in class ForwardingObject
iterator
public Iterator<E> iterator()
- Specified by:
iterator
in interface Iterable<E>
- Specified by:
iterator
in interface Collection<E>
size
public int size()
- Specified by:
size
in interface Collection<E>
removeAll
public boolean removeAll(Collection<?> collection)
-
This method always throws a NullPointerException
when
collection
is null.
- Specified by:
removeAll
in interface Collection<E>
isEmpty
public boolean isEmpty()
- Specified by:
isEmpty
in interface Collection<E>
contains
public boolean contains(Object object)
- Specified by:
contains
in interface Collection<E>
toArray
public Object[] toArray()
- Specified by:
toArray
in interface Collection<E>
toArray
public <T> T[] toArray(T[] array)
- Specified by:
toArray
in interface Collection<E>
add
public boolean add(E element)
- Specified by:
add
in interface Collection<E>
remove
public boolean remove(Object object)
- Specified by:
remove
in interface Collection<E>
containsAll
public boolean containsAll(Collection<?> collection)
- Specified by:
containsAll
in interface Collection<E>
addAll
public boolean addAll(Collection<? extends E> collection)
- Specified by:
addAll
in interface Collection<E>
retainAll
public boolean retainAll(Collection<?> collection)
-
This method always throws a NullPointerException
when
collection
is null.
- Specified by:
retainAll
in interface Collection<E>
clear
public void clear()
- Specified by:
clear
in interface Collection<E>