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 behavior.

Methods are forwarded directly to the decorated bag.

Since:
3.0
See Also:

  • Constructor Details

    • 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 Details

    • 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

    • 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

    • 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

    • hashCode

      public int hashCode()
      Specified by:
      hashCode in interface Collection<E>
      Overrides:
      hashCode in class Object

    • 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