Package com.google.common.collect
Class Sets.SetView<E>
- java.lang.Object
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- java.util.AbstractCollection<E>
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- java.util.AbstractSet<E>
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- com.google.common.collect.Sets.SetView<E>
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- 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 typeSetView
; typically, you either use it as a plainSet
, or immediately invokeimmutableCopy()
orcopyInto(S)
and forget theSetView
itself.- Since:
- 2.0 (imported from Google Collections Library)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description <S extends Set<E>>
ScopyInto(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.AbstractSet
equals, hashCode, removeAll
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Methods inherited from class java.util.AbstractCollection
add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, toArray, toArray, toString
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Methods inherited from interface java.util.Collection
parallelStream, removeIf, stream, toArray
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Method Detail
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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 withObject.equals(Object)
.
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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 toset.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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