Package org.apache.sis.util.collection

Class DerivedSet.Bijective<S,E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

org.apache.sis.internal.util.SetOfUnknownSize<E>

org.apache.sis.util.collection.DerivedSet<S,E>

org.apache.sis.util.collection.DerivedSet.Invertible<S,E>

org.apache.sis.util.collection.DerivedSet.Bijective<S,E>

Type Parameters:

S - the type of elements in the storage set.

E - the type of elements in this set.

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, Set<E>, CheckedContainer<E>

Enclosing class:

DerivedSet<S,E>

private static final class DerivedSet.Bijective<S,E>
extends DerivedSet.Invertible<S,E>

A DerivedSet for converters that are both invertible and bijective. The bijection allows us to query the DerivedSet.storage set size directly instead of iterating over all elements.

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	serialVersionUID	For cross-version compatibility.

Fields inherited from class org.apache.sis.util.collection.DerivedSet

converter, storage

Constructor Summary

Constructors

Constructor	Description
Bijective(Set<S> storage, ObjectConverter<S,E> converter)	Creates a new derived set from the specified storage set.

Method Summary

Modifier and Type	Method	Description
boolean	isEmpty()	Returns true if this set contains no elements.
int	size()	Returns the number of elements in this set.

Methods inherited from class org.apache.sis.util.collection.DerivedSet.Invertible

add, contains, remove

Methods inherited from class org.apache.sis.util.collection.DerivedSet

add, create, getElementType, iterator

Methods inherited from class org.apache.sis.internal.util.SetOfUnknownSize

equals, isSizeKnown, removeAll, spliterator, toArray, toArray

Methods inherited from class java.util.AbstractSet

hashCode

Methods inherited from class java.util.AbstractCollection

addAll, clear, containsAll, retainAll, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

addAll, clear, containsAll, retainAll

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

Constructor Details

Bijective

Bijective(Set<S> storage,
 ObjectConverter<S,E> converter)

Creates a new derived set from the specified storage set.

Parameters:

storage - the set which actually store the elements.

converter - the type of elements in this derived set.

Method Details

size

public int size()

Returns the number of elements in this set. The default implementation counts the number of elements returned by the iterator. Subclasses are encouraged to cache this value if they know that the underlying storage is immutable.

Specified by:

size in interface Collection<S>

Specified by:

size in interface Set<S>

Overrides:

size in class SetOfUnknownSize<E>

Returns:

the number of elements in this set.

isEmpty

public boolean isEmpty()

Returns true if this set contains no elements.

Specified by:

isEmpty in interface Collection<S>

Specified by:

isEmpty in interface Set<S>

Overrides:

isEmpty in class DerivedSet<S,E>

Returns:

true if this set contains no elements.