com.google.common.collect
Class Sets.SetView<E>
java.lang.Object
java.util.AbstractCollection<E>
java.util.AbstractSet<E>
com.google.common.collect.Sets.SetView<E>
- All Implemented Interfaces:
- Iterable<E>, Collection<E>, Set<E>
- Enclosing class:
- Sets
public abstract static class Sets.SetView<E>
- extends AbstractSet<E>
An unmodifiable view of a set which may be backed by other sets; this view
will change as the backing sets do. Contains methods to copy the data into
a new set which will then remain stable. There is usually no reason to
retain a reference of type SetView; typically, you either use it
as a plain Set, or immediately invoke immutableCopy() or
copyInto(S) and forget the SetView itself.
- Since:
- 2.0 (imported from Google Collections Library)
|
Method Summary |
|
copyInto(S set)
Copies the current contents of this set view into an existing set. |
ImmutableSet<E> |
immutableCopy()
Returns an immutable copy of the current contents of this set view. |
| Methods inherited from class java.util.AbstractCollection |
add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, toArray, toArray, toString |
| Methods inherited from interface java.util.Set |
add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, toArray, toArray |
immutableCopy
public ImmutableSet<E> immutableCopy()
- Returns an immutable copy of the current contents of this set view.
Does not support null elements.
Warning: this may have unexpected results if a backing set of
this view uses a nonstandard notion of equivalence, for example if it is
a TreeSet using a comparator that is inconsistent with Object.equals(Object).
copyInto
public <S extends Set<E>> S copyInto(S set)
- Copies the current contents of this set view into an existing set. This
method has equivalent behavior to
set.addAll(this), assuming that
all the sets involved are based on the same notion of equivalence.
- Returns:
- a reference to
set, for convenience
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