Package org.apache.commons.collections4.bag

Class AbstractBagDecorator<E>

java.lang.Object

org.apache.commons.collections4.collection.AbstractCollectionDecorator<E>

org.apache.commons.collections4.bag.AbstractBagDecorator<E>

Type Parameters:

E - the type of elements in this bag

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, Bag<E>

Direct Known Subclasses:

AbstractSortedBagDecorator, CollectionBag, UnmodifiableBag

public abstract class AbstractBagDecorator<E>
extends AbstractCollectionDecorator<E>
implements Bag<E>

Decorates another Bag to provide additional behaviour.

Methods are forwarded directly to the decorated bag.

Since:

3.0

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractBagDecorator()	Constructor only used in deserialization, do not use otherwise.
protected	AbstractBagDecorator(Bag<E> bag)	Constructor that wraps (not copies).

Method Summary

Modifier and Type	Method	Description
boolean	add(E object, int count)	Adds nCopies copies of the specified object to the Bag.
protected Bag<E>	decorated()	Gets the bag being decorated.
boolean	equals(Object object)
int	getCount(Object object)	Returns the number of occurrences (cardinality) of the given object currently in the bag.
int	hashCode()
boolean	remove(Object object, int count)	Removes nCopies copies of the specified object from the Bag.
Set<E>	uniqueSet()	Returns a Set of unique elements in the Bag.

Methods inherited from class org.apache.commons.collections4.collection.AbstractCollectionDecorator

add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, setCollection, size, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.collections4.Bag

add, containsAll, iterator, remove, removeAll, retainAll, size

Methods inherited from interface java.util.Collection

addAll, clear, contains, isEmpty, parallelStream, removeIf, spliterator, stream, toArray, toArray, toArray

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

AbstractBagDecorator

protected AbstractBagDecorator()

Constructor only used in deserialization, do not use otherwise.

Since:

3.1

AbstractBagDecorator

protected AbstractBagDecorator(Bag<E> bag)

Constructor that wraps (not copies).

Parameters:

bag - the bag to decorate, must not be null

Throws:

NullPointerException - if bag is null

Method Detail

decorated

protected Bag<E> decorated()

Gets the bag being decorated.

Overrides:

decorated in class AbstractCollectionDecorator<E>

Returns:

the decorated bag

equals

public boolean equals(Object object)

Specified by:

equals in interface Collection<E>

Overrides:

equals in class Object

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<E>

Overrides:

hashCode in class Object

getCount

public int getCount(Object object)

Description copied from interface: Bag

Returns the number of occurrences (cardinality) of the given object currently in the bag. If the object does not exist in the bag, return 0.

Specified by:

getCount in interface Bag<E>

Parameters:

object - the object to search for

Returns:

the number of occurrences of the object, zero if not found

add

public boolean add(E object,
                   int count)

Description copied from interface: Bag

Adds nCopies copies of the specified object to the Bag.

If the object is already in the Bag.uniqueSet() then increment its count as reported by Bag.getCount(Object). Otherwise add it to the Bag.uniqueSet() and report its count as nCopies.

Specified by:

add in interface Bag<E>

Parameters:

object - the object to add

count - the number of copies to add

Returns:

true if the object was not already in the uniqueSet

remove

public boolean remove(Object object,
                      int count)

Description copied from interface: Bag

Removes nCopies copies of the specified object from the Bag.

If the number of copies to remove is greater than the actual number of copies in the Bag, no error is thrown.

Specified by:

remove in interface Bag<E>

Parameters:

object - the object to remove

count - the number of copies to remove

Returns:

true if this call changed the collection

uniqueSet

public Set<E> uniqueSet()

Description copied from interface: Bag

Returns a Set of unique elements in the Bag.

Uniqueness constraints are the same as those in Set.

Specified by:

uniqueSet in interface Bag<E>

Returns:

the Set of unique Bag elements