Package org.apache.commons.collections4.multimap

Class ArrayListValuedHashMap<K,V>

java.lang.Object

org.apache.commons.collections4.multimap.AbstractMultiValuedMap<K,V>

org.apache.commons.collections4.multimap.AbstractListValuedMap<K,V>

org.apache.commons.collections4.multimap.ArrayListValuedHashMap<K,V>

Type Parameters:

K - the type of the keys in this map

V - the type of the values in this map

All Implemented Interfaces:

Serializable, ListValuedMap<K,V>, MultiValuedMap<K,V>

public class ArrayListValuedHashMap<K,V>
extends AbstractListValuedMap<K,V>
implements Serializable

Implements a ListValuedMap, using a HashMap to provide data storage and ArrayLists as value collections. This is the standard implementation of a ListValuedMap.

Note that ArrayListValuedHashMap is not synchronized and is not thread-safe. If you wish to use this map from multiple threads concurrently, you must use appropriate synchronization. This class may throw exceptions when accessed by concurrent threads without synchronization.

Since:

4.1

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ArrayListValuedHashMap()	Creates an empty ArrayListValuedHashMap with the default initial map capacity (16) and the default initial list capacity (3).
ArrayListValuedHashMap(int initialListCapacity)	Creates an empty ArrayListValuedHashMap with the default initial map capacity (16) and the specified initial list capacity.
ArrayListValuedHashMap(int initialMapCapacity, int initialListCapacity)	Creates an empty ArrayListValuedHashMap with the specified initial map and list capacities.
ArrayListValuedHashMap(Map<? extends K,? extends V> map)	Creates an ArrayListValuedHashMap copying all the mappings of the given map.
ArrayListValuedHashMap(MultiValuedMap<? extends K,? extends V> map)	Creates an ArrayListValuedHashMap copying all the mappings of the given map.

Method Summary

Modifier and Type	Method	Description
protected ArrayList<V>	createCollection()	Creates a new value collection using the provided factory.
void	trimToSize()	Trims the capacity of all value collections to their current size.

Methods inherited from class org.apache.commons.collections4.multimap.AbstractListValuedMap

get, getMap, remove

Methods inherited from class org.apache.commons.collections4.multimap.AbstractMultiValuedMap

asMap, clear, containsKey, containsMapping, containsValue, doReadObject, doWriteObject, entries, equals, hashCode, isEmpty, keys, keySet, mapIterator, put, putAll, putAll, putAll, removeMapping, setMap, size, toString, values

Methods inherited from class java.lang.Object

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

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

asMap, clear, containsKey, containsMapping, containsValue, entries, isEmpty, keys, keySet, mapIterator, put, putAll, putAll, putAll, removeMapping, size, values

Constructor Details

ArrayListValuedHashMap

public ArrayListValuedHashMap()

Creates an empty ArrayListValuedHashMap with the default initial map capacity (16) and the default initial list capacity (3).

ArrayListValuedHashMap

public ArrayListValuedHashMap(int initialListCapacity)

Creates an empty ArrayListValuedHashMap with the default initial map capacity (16) and the specified initial list capacity.

Parameters:

initialListCapacity - the initial capacity used for value collections

ArrayListValuedHashMap

public ArrayListValuedHashMap(int initialMapCapacity,
 int initialListCapacity)

Creates an empty ArrayListValuedHashMap with the specified initial map and list capacities.

Parameters:

initialMapCapacity - the initial hashmap capacity

initialListCapacity - the initial capacity used for value collections

ArrayListValuedHashMap

public ArrayListValuedHashMap(Map<? extends K,? extends V> map)

Creates an ArrayListValuedHashMap copying all the mappings of the given map.

Parameters:

map - a Map to copy into this map

ArrayListValuedHashMap

public ArrayListValuedHashMap(MultiValuedMap<? extends K,? extends V> map)

Creates an ArrayListValuedHashMap copying all the mappings of the given map.

Parameters:

map - a MultiValuedMap to copy into this map

Method Details

createCollection

protected ArrayList<V> createCollection()

Description copied from class: AbstractListValuedMap

Creates a new value collection using the provided factory.

Specified by:

createCollection in class AbstractListValuedMap<K,V>

Returns:

a new list

trimToSize

public void trimToSize()

Trims the capacity of all value collections to their current size.