Package org.apache.commons.collections.bag

This package contains implementations of the Bag and SortedBag interfaces. A bag stores an object and a count of the number of occurences of the object.

The following implementations are provided in the package:

• HashBag - implementation that uses a HashMap to store the data
• TreeBag - implementation that uses a TreeMap to store the data

The following decorators are provided in the package:

• Synchronized - synchronizes method access for multi-threaded environments
• Unmodifiable - ensures the bag cannot be altered
• Predicated - ensures that only elements that are valid according to a predicate can be added
• Typed - ensures that only elements that are of a specific type can be added
• Transformed - transforms each element added to the bag

Class Summary

Class	Description
AbstractBagDecorator	Decorates another Bag to provide additional behaviour.
AbstractMapBag	Abstract implementation of the Bag interface to simplify the creation of subclass implementations.
AbstractSortedBagDecorator	Decorates another SortedBag to provide additional behaviour.
HashBag	Implements Bag, using a HashMap to provide the data storage.
PredicatedBag	Decorates another Bag to validate that additions match a specified predicate.
PredicatedSortedBag	Decorates another SortedBag to validate that additions match a specified predicate.
SynchronizedBag	Decorates another Bag to synchronize its behaviour for a multi-threaded environment.
SynchronizedSortedBag	Decorates another SortedBag to synchronize its behaviour for a multi-threaded environment.
TransformedBag	Decorates another Bag to transform objects that are added.
TransformedSortedBag	Decorates another SortedBag to transform objects that are added.
TreeBag	Implements SortedBag, using a TreeMap to provide the data storage.
TypedBag	Decorates another Bag to validate that elements added are of a specific type.
TypedSortedBag	Decorates another SortedBag to validate that elements added are of a specific type.
UnmodifiableBag	Decorates another Bag to ensure it can't be altered.
UnmodifiableSortedBag	Decorates another SortedBag to ensure it can't be altered.