Class ImmutableEmptySetWithHashingStrategy<T>

java.lang.Object

org.eclipse.collections.impl.AbstractRichIterable<T>

org.eclipse.collections.impl.collection.immutable.AbstractImmutableCollection<T>

org.eclipse.collections.impl.set.immutable.AbstractImmutableSet<T>

org.eclipse.collections.impl.set.strategy.immutable.ImmutableEmptySetWithHashingStrategy<T>

All Implemented Interfaces:

Serializable, Iterable<T>, Collection<T>, Set<T>, ImmutableCollection<T>, InternalIterable<T>, RichIterable<T>, ImmutableSet<T>, ImmutableSetIterable<T>, SetIterable<T>, UnsortedSetIterable<T>

final class ImmutableEmptySetWithHashingStrategy<T>
extends AbstractImmutableSet<T>
implements Serializable

This is a zero element ImmutableUnifiedSetWithHashingStrategy which is created by calling the HashingStrategySets.immutable.empty() method.

Nested Class Summary

Nested classes/interfaces inherited from class AbstractImmutableSet

AbstractImmutableSet.ImmutableSetIterator

Field Summary

Fields

Modifier and Type	Field	Description
private final HashingStrategy<? super T>	hashingStrategy
private static final long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
ImmutableEmptySetWithHashingStrategy(HashingStrategy<? super T> hashingStrategy)

Method Summary

Modifier and Type	Method	Description
boolean	contains(Object object)	Returns true if the iterable has an element which responds true to element.equals(object).
void	each(Procedure<? super T> procedure)	The procedure is executed for each element in the iterable.
boolean	equals(Object other)	Follows the same general contract as Set.equals(Object).
<P> void	forEachWith(Procedure2<? super T, ? super P> procedure, P parameter)	The procedure2 is evaluated for each element in the iterable with the specified parameter provided as the second argument.
void	forEachWithIndex(ObjectIntProcedure<? super T> objectIntProcedure)	Iterates over the iterable passing each element and the current relative int index to the specified instance of ObjectIntProcedure.
T	getFirst()	Returns the first element of an iterable.
T	getLast()	Returns the last element of an iterable.
T	getOnly()	Returns the element if the iterable has exactly one element.
int	hashCode()	Follows the same general contract as Set.hashCode().
Iterator<T>	iterator()
T	max()	Returns the maximum element out of this container based on the natural order.
T	max(Comparator<? super T> comparator)	Returns the maximum element out of this container based on the comparator.
<V extends Comparable<? super V>> T	maxBy(Function<? super T, ? extends V> function)	Returns the maximum elements out of this container based on the natural order of the attribute returned by Function.
T	min()	Returns the minimum element out of this container based on the natural order.
T	min(Comparator<? super T> comparator)	Returns the minimum element out of this container based on the comparator.
<V extends Comparable<? super V>> T	minBy(Function<? super T, ? extends V> function)	Returns the minimum elements out of this container based on the natural order of the attribute returned by Function.
ImmutableSet<T>	newWith(T element)	This method is similar to the with method in MutableCollection with the difference that a new copy of this collection with the element appended will be returned.
ImmutableSet<T>	newWithAll(Iterable<? extends T> elements)	This method is similar to the withAll method in MutableCollection with the difference that a new copy of this collection with the elements appended will be returned.
ImmutableSet<T>	newWithout(T element)	This method is similar to the without method in MutableCollection with the difference that a new copy of this collection with the element removed will be returned.
ImmutableSet<T>	newWithoutAll(Iterable<? extends T> elements)	This method is similar to the withoutAll method in MutableCollection with the difference that a new copy of this collection with the elements removed will be returned.
int	size()	Returns the number of items in this iterable.
private Object	writeReplace()
<S, R extends Collection<Pair<T,S>>> R	zip(Iterable<S> that, R target)	Same as RichIterable.zip(Iterable) but uses target for output.
<R extends Collection<Pair<T,Integer>>> R	zipWithIndex(R target)	Same as RichIterable.zipWithIndex() but uses target for output.

Methods inherited from class AbstractImmutableSet

asParallel, cartesianProduct, castToSet, collect, collectBoolean, collectByte, collectChar, collectDouble, collectFloat, collectIf, collectInt, collectLong, collectShort, collectWith, difference, differenceInto, flatCollect, groupBy, groupBy, groupByEach, groupByEach, intersect, intersectInto, isProperSubsetOf, isSubsetOf, newMutable, nullSafeHashCode, partition, partitionWith, powerSet, reject, rejectWith, select, selectInstancesOf, selectWith, symmetricDifference, symmetricDifferenceInto, tap, toImmutable, union, unionInto, zip, zipWithIndex

Methods inherited from class AbstractImmutableCollection

add, addAll, castToCollection, chunk, clear, countBy, countByEach, countByWith, groupByUniqueKey, parallelStream, reduce, remove, removeAll, removeAllFrom, retainAll, spliterator, stream, sumByDouble, sumByFloat, sumByInt, sumByLong, toArray, toArray

Methods inherited from class AbstractRichIterable

allSatisfy, allSatisfyWith, anySatisfy, anySatisfyWith, appendString, appendString, asLazy, collect, collectIf, collectWith, containsAll, containsAllArguments, containsAllIterable, count, countWith, detect, detectOptional, detectWith, detectWithIfNone, detectWithOptional, flatCollect, forEach, groupByUniqueKey, injectInto, injectInto, injectInto, injectInto, injectInto, into, isEmpty, noneSatisfy, noneSatisfyWith, reject, rejectWith, select, selectWith, sumOfDouble, sumOfFloat, sumOfInt, sumOfLong, toBag, toBiMap, toList, toMap, toSet, toSortedBag, toSortedBag, toSortedBagBy, toSortedListBy, toSortedMap, toSortedMap, toSortedMapBy, toSortedSet, toSortedSet, toSortedSetBy, toString

Methods inherited from class Object

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

Methods inherited from interface Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface ImmutableCollection

aggregateBy, aggregateInPlaceBy, castToCollection, countBy, countByEach, countByWith, flatCollectWith, groupByUniqueKey, parallelStream, reduceBy, spliterator, stream, sumByDouble, sumByFloat, sumByInt, sumByLong

Methods inherited from interface ImmutableSet

flatCollectWith, toImmutableSet

Methods inherited from interface InternalIterable

forEach

Methods inherited from interface RichIterable

aggregateBy, allSatisfy, allSatisfyWith, anySatisfy, anySatisfyWith, appendString, appendString, appendString, asLazy, chunk, collect, collectBoolean, collectByte, collectChar, collectDouble, collectFloat, collectIf, collectInt, collectLong, collectShort, collectWith, containsAll, containsAllArguments, containsAllIterable, containsAny, containsAnyIterable, containsBy, containsNone, containsNoneIterable, count, countBy, countByEach, countByWith, countWith, detect, detectIfNone, detectOptional, detectWith, detectWithIfNone, detectWithOptional, flatCollect, flatCollectBoolean, flatCollectByte, flatCollectChar, flatCollectDouble, flatCollectFloat, flatCollectInt, flatCollectLong, flatCollectShort, flatCollectWith, forEach, getAny, groupByAndCollect, groupByUniqueKey, injectInto, injectInto, injectInto, injectInto, injectInto, injectIntoDouble, injectIntoFloat, injectIntoInt, injectIntoLong, into, isEmpty, makeString, makeString, makeString, makeString, maxByOptional, maxOptional, maxOptional, minByOptional, minOptional, minOptional, noneSatisfy, noneSatisfyWith, notEmpty, reduce, reduceBy, reduceInPlace, reduceInPlace, reject, rejectWith, select, selectWith, summarizeDouble, summarizeFloat, summarizeInt, summarizeLong, sumOfDouble, sumOfFloat, sumOfInt, sumOfLong, toArray, toArray, toBag, toBiMap, toImmutableBag, toImmutableBiMap, toImmutableList, toImmutableMap, toImmutableSortedBag, toImmutableSortedBag, toImmutableSortedBagBy, toImmutableSortedList, toImmutableSortedList, toImmutableSortedListBy, toImmutableSortedSet, toImmutableSortedSet, toImmutableSortedSetBy, toList, toMap, toMap, toSet, toSortedBag, toSortedBag, toSortedBagBy, toSortedList, toSortedList, toSortedListBy, toSortedMap, toSortedMap, toSortedMapBy, toSortedSet, toSortedSet, toSortedSetBy, toString

Methods inherited from interface Set

add, addAll, clear, containsAll, isEmpty, remove, removeAll, retainAll, spliterator, toArray, toArray

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

hashingStrategy

private final HashingStrategy<? super T> hashingStrategy

Constructor Details

ImmutableEmptySetWithHashingStrategy

ImmutableEmptySetWithHashingStrategy(HashingStrategy<? super T> hashingStrategy)

Method Details

equals

public boolean equals(Object other)

Description copied from interface: SetIterable

Follows the same general contract as Set.equals(Object).

Specified by:

equals in interface Collection<T>

Specified by:

equals in interface Set<T>

Specified by:

equals in interface SetIterable<T>

Overrides:

equals in class Object

hashCode

public int hashCode()

Description copied from interface: SetIterable

Follows the same general contract as Set.hashCode().

Specified by:

hashCode in interface Collection<T>

Specified by:

hashCode in interface Set<T>

Specified by:

hashCode in interface SetIterable<T>

Overrides:

hashCode in class Object

newWith

public ImmutableSet<T> newWith(T element)

Description copied from interface: ImmutableCollection

This method is similar to the with method in MutableCollection with the difference that a new copy of this collection with the element appended will be returned.

Specified by:

newWith in interface ImmutableCollection<T>

Specified by:

newWith in interface ImmutableSet<T>

Overrides:

newWith in class AbstractImmutableSet<T>

newWithAll

public ImmutableSet<T> newWithAll(Iterable<? extends T> elements)

Description copied from interface: ImmutableCollection

This method is similar to the withAll method in MutableCollection with the difference that a new copy of this collection with the elements appended will be returned.

Specified by:

newWithAll in interface ImmutableCollection<T>

Specified by:

newWithAll in interface ImmutableSet<T>

Overrides:

newWithAll in class AbstractImmutableSet<T>

newWithout

public ImmutableSet<T> newWithout(T element)

Description copied from interface: ImmutableCollection

This method is similar to the without method in MutableCollection with the difference that a new copy of this collection with the element removed will be returned.

Specified by:

newWithout in interface ImmutableCollection<T>

Specified by:

newWithout in interface ImmutableSet<T>

Overrides:

newWithout in class AbstractImmutableSet<T>

newWithoutAll

public ImmutableSet<T> newWithoutAll(Iterable<? extends T> elements)

Description copied from interface: ImmutableCollection

This method is similar to the withoutAll method in MutableCollection with the difference that a new copy of this collection with the elements removed will be returned.

Specified by:

newWithoutAll in interface ImmutableCollection<T>

Specified by:

newWithoutAll in interface ImmutableSet<T>

Overrides:

newWithoutAll in class AbstractImmutableSet<T>

size

public int size()

Description copied from interface: RichIterable

Returns the number of items in this iterable.

Specified by:

size in interface Collection<T>

Specified by:

size in interface RichIterable<T>

Specified by:

size in interface Set<T>

contains

public boolean contains(Object object)

Description copied from interface: RichIterable

Returns true if the iterable has an element which responds true to element.equals(object).

Specified by:

contains in interface Collection<T>

Specified by:

contains in interface RichIterable<T>

Specified by:

contains in interface Set<T>

Overrides:

contains in class AbstractRichIterable<T>

each

public void each(Procedure<? super T> procedure)

Description copied from interface: RichIterable

The procedure is executed for each element in the iterable.

Example using a Java 8 lambda expression:

people.each(person -> LOGGER.info(person.getName()));

This method is a variant of InternalIterable.forEach(Procedure) that has a signature conflict with Iterable.forEach(java.util.function.Consumer).

Specified by:

each in interface RichIterable<T>

See Also:

• InternalIterable.forEach(Procedure)
• Iterable.forEach(java.util.function.Consumer)

forEachWithIndex

public void forEachWithIndex(ObjectIntProcedure<? super T> objectIntProcedure)

Description copied from interface: InternalIterable

Iterates over the iterable passing each element and the current relative int index to the specified instance of ObjectIntProcedure.

Example using a Java 8 lambda:

people.forEachWithIndex((Person person, int index) -> LOGGER.info("Index: " + index + " person: " + person.getName()));

Example using an anonymous inner class:

people.forEachWithIndex(new ObjectIntProcedure<Person>()
{
    public void value(Person person, int index)
    {
        LOGGER.info("Index: " + index + " person: " + person.getName());
    }
});

Specified by:

forEachWithIndex in interface InternalIterable<T>

Overrides:

forEachWithIndex in class AbstractRichIterable<T>

forEachWith

public <P> void forEachWith(Procedure2<? super T, ? super P> procedure,
 P parameter)

Description copied from interface: InternalIterable

The procedure2 is evaluated for each element in the iterable with the specified parameter provided as the second argument.

Example using a Java 8 lambda:

people.forEachWith((Person person, Person other) ->
    {
        if (person.isRelatedTo(other))
        {
             LOGGER.info(person.getName());
        }
    }, fred);

Example using an anonymous inner class:

people.forEachWith(new Procedure2<Person, Person>()
{
    public void value(Person person, Person other)
    {
        if (person.isRelatedTo(other))
        {
             LOGGER.info(person.getName());
        }
    }
}, fred);

Specified by:

forEachWith in interface InternalIterable<T>

Overrides:

forEachWith in class AbstractRichIterable<T>

iterator

public Iterator<T> iterator()

Specified by:

iterator in interface Collection<T>

Specified by:

iterator in interface Iterable<T>

Specified by:

iterator in interface Set<T>

min

public T min(Comparator<? super T> comparator)

Description copied from interface: RichIterable

Returns the minimum element out of this container based on the comparator.

Specified by:

min in interface RichIterable<T>

Overrides:

min in class AbstractRichIterable<T>

max

public T max(Comparator<? super T> comparator)

Description copied from interface: RichIterable

Returns the maximum element out of this container based on the comparator.

Specified by:

max in interface RichIterable<T>

Overrides:

max in class AbstractRichIterable<T>

min

public T min()

Description copied from interface: RichIterable

Returns the minimum element out of this container based on the natural order.

Specified by:

min in interface RichIterable<T>

Overrides:

min in class AbstractRichIterable<T>

max

public T max()

Description copied from interface: RichIterable

Returns the maximum element out of this container based on the natural order.

Specified by:

max in interface RichIterable<T>

Overrides:

max in class AbstractRichIterable<T>

minBy

public <V extends Comparable<? super V>> T minBy(Function<? super T, ? extends V> function)

Description copied from interface: RichIterable

Returns the minimum elements out of this container based on the natural order of the attribute returned by Function.

Specified by:

minBy in interface RichIterable<T>

Overrides:

minBy in class AbstractRichIterable<T>

maxBy

public <V extends Comparable<? super V>> T maxBy(Function<? super T, ? extends V> function)

Description copied from interface: RichIterable

Returns the maximum elements out of this container based on the natural order of the attribute returned by Function.

Specified by:

maxBy in interface RichIterable<T>

Overrides:

maxBy in class AbstractRichIterable<T>

zip

public <S, R extends Collection<Pair<T,S>>> R zip(Iterable<S> that,
 R target)

Description copied from interface: RichIterable

Same as RichIterable.zip(Iterable) but uses target for output.

Specified by:

zip in interface RichIterable<T>

Overrides:

zip in class AbstractRichIterable<T>

zipWithIndex

public <R extends Collection<Pair<T,Integer>>> R zipWithIndex(R target)

Description copied from interface: RichIterable

Same as RichIterable.zipWithIndex() but uses target for output.

Specified by:

zipWithIndex in interface RichIterable<T>

Overrides:

zipWithIndex in class AbstractRichIterable<T>

getFirst

public T getFirst()

Description copied from interface: RichIterable

Returns the first element of an iterable. In the case of a List it is the element at the first index. In the case of any other Collection, it is the first element that would be returned during an iteration. If the iterable is empty, null is returned. If null is a valid element of the container, then a developer would need to check to see if the iterable is empty to validate that a null result was not due to the container being empty.

The order of Sets are not guaranteed (except for TreeSets and other Ordered Set implementations), so if you use this method, the first element could be any element from the Set.

Specified by:

getFirst in interface RichIterable<T>

getLast

public T getLast()

Description copied from interface: RichIterable

Returns the last element of an iterable. In the case of a List it is the element at the last index. In the case of any other Collection, it is the last element that would be returned during an iteration. If the iterable is empty, null is returned. If null is a valid element of the container, then a developer would need to check to see if the iterable is empty to validate that a null result was not due to the container being empty.

The order of Sets are not guaranteed (except for TreeSets and other Ordered Set implementations), so if you use this method, the last element could be any element from the Set.

Specified by:

getLast in interface RichIterable<T>

getOnly

public T getOnly()

Description copied from interface: RichIterable

Returns the element if the iterable has exactly one element. Otherwise, throw IllegalStateException.

Specified by:

getOnly in interface RichIterable<T>

Returns:

an element of an iterable.

writeReplace

private Object writeReplace()