org.apache.commons.collections4.set.MapBackedSet<E,V>
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java.lang.Object
public final class MapBackedSet<E,V>
Decorates a Map to obtain Set behaviour.
This class is used to create a Set with the same properties as
the key set of any map. Thus, a ReferenceSet can be created by wrapping a
ReferenceMap in an instance of this class.
Most map implementation can be used to create a set by passing in dummy values.
Exceptions include BidiMap implementations, as they require unique values.
| Method Summary | ||
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boolean |
add(E obj)
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boolean |
addAll(Collection<? extends E> coll)
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void |
clear()
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boolean |
contains(Object obj)
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boolean |
containsAll(Collection<?> coll)
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boolean |
equals(Object obj)
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int |
hashCode()
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boolean |
isEmpty()
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Iterator<E> |
iterator()
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static
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mapBackedSet(Map<E,? super V> map)
Factory method to create a set from a map. |
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static
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mapBackedSet(Map<E,? super V> map,
V dummyValue)
Factory method to create a set from a map. |
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boolean |
remove(Object obj)
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boolean |
removeAll(Collection<?> coll)
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boolean |
retainAll(Collection<?> coll)
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int |
size()
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Object[] |
toArray()
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toArray(T[] array)
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| Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Method Detail |
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public static <E,V> MapBackedSet<E,V> mapBackedSet(Map<E,? super V> map)
E - the element typeV - the dummy value type in the mapmap - the map to decorate, must not be null
IllegalArgumentException - if set is null
public static <E,V> MapBackedSet<E,V> mapBackedSet(Map<E,? super V> map,
V dummyValue)
E - the element typeV - the dummy value type in the mapmap - the map to decorate, must not be nulldummyValue - the dummy value to use
IllegalArgumentException - if map is nullpublic int size()
size in interface Collection<E>size in interface Set<E>public boolean isEmpty()
isEmpty in interface Collection<E>isEmpty in interface Set<E>public Iterator<E> iterator()
iterator in interface Iterable<E>iterator in interface Collection<E>iterator in interface Set<E>public boolean contains(Object obj)
contains in interface Collection<E>contains in interface Set<E>public boolean containsAll(Collection<?> coll)
containsAll in interface Collection<E>containsAll in interface Set<E>public boolean add(E obj)
add in interface Collection<E>add in interface Set<E>public boolean addAll(Collection<? extends E> coll)
addAll in interface Collection<E>addAll in interface Set<E>public boolean remove(Object obj)
remove in interface Collection<E>remove in interface Set<E>public boolean removeAll(Collection<?> coll)
removeAll in interface Collection<E>removeAll in interface Set<E>public boolean retainAll(Collection<?> coll)
retainAll in interface Collection<E>retainAll in interface Set<E>public void clear()
clear in interface Collection<E>clear in interface Set<E>public Object[] toArray()
toArray in interface Collection<E>toArray in interface Set<E>public <T> T[] toArray(T[] array)
toArray in interface Collection<E>toArray in interface Set<E>public boolean equals(Object obj)
equals in interface Collection<E>equals in interface Set<E>equals in class Objectpublic int hashCode()
hashCode in interface Collection<E>hashCode in interface Set<E>hashCode in class Object
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