Apache Commons Collections 4.4 · org.apache.commons.collections4.multimap

This package contains implementations of the org.apache.commons.collections4.MultiValuedMap interfaces. A MultiValuedMap holds a collection of values against each key.

The following implementations are provided in the package:

ArrayListValuedHashMap - ListValuedMap implementation using a HashMap/ArrayList
HashSetValuedHashMap - SetValuedMap implementation using a HashMap/HashSet

The following decorators are provided in the package:

Transformed - transforms elements added to the MultiValuedMap
Unmodifiable - ensures the collection cannot be altered

Class Summary

Modifier and Type	Class and Description
public abstract class	AbstractListValuedMap< the type of the keys in this map K, the type of the values in this map V> Abstract implementation of the `ListValuedMap` interface to simplify the creation of subclass implementations.
public abstract class	AbstractMultiValuedMap< the type of the keys in this map K, the type of the values in this map V> Abstract implementation of the `MultiValuedMap` interface to simplify the creation of subclass implementations.
public abstract class	AbstractMultiValuedMapDecorator< the type of key elements K, the type of value elements V> Decorates another `MultiValuedMap` to provide additional behaviour.
public abstract class	AbstractSetValuedMap< the type of the keys in this map K, the type of the values in this map V> Abstract implementation of the `SetValuedMap` interface to simplify the creation of subclass implementations.
public class	ArrayListValuedHashMap< the type of the keys in this map K, the type of the values in this map V> Implements a `ListValuedMap`, using a `HashMap` to provide data storage and `ArrayList`s as value collections.
public class	HashSetValuedHashMap< the type of the keys in this map K, the type of the values in this map V> Implements a `SetValuedMap`, using a `HashMap` to provide data storage and `HashSet`s as value collections.
public class	TransformedMultiValuedMap< the type of the keys in this map K, the type of the values in this map V> Decorates another `MultiValuedMap` to transform objects that are added.
public class	UnmodifiableMultiValuedMap< the type of key elements K, the type of value elements V> Decorates another `MultiValuedMap` to ensure it can't be altered.

Package org.apache.commons.collections4.multimap

Class Summary