com.google.common.collect

Class ForwardingListMultimap<K,V>

java.lang.Object

com.google.common.collect.ForwardingObject

com.google.common.collect.ForwardingMultimap<K,V>

com.google.common.collect.ForwardingListMultimap<K,V>

All Implemented Interfaces:

ListMultimap<K,V>, Multimap<K,V>

@GwtCompatible
public abstract class ForwardingListMultimap<K,V>
extends ForwardingMultimap<K,V>
implements ListMultimap<K,V>

A list multimap which forwards all its method calls to another list multimap. Subclasses should override one or more methods to modify the behavior of the backing multimap as desired per the decorator pattern.

Since:

3.0

Author:

Kurt Alfred Kluever

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ForwardingListMultimap() Constructor for use by subclasses.

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract ListMultimap<K,V>	delegate() Returns the backing delegate instance that methods are forwarded to.
List<V>	get(K key) Returns a collection view containing the values associated with key in this multimap, if any.
List<V>	removeAll(Object key) Removes all values associated with a given key.
List<V>	replaceValues(K key, Iterable<? extends V> values) Stores a collection of values with the same key, replacing any existing values for that key.

Methods inherited from class com.google.common.collect.ForwardingMultimap

asMap, clear, containsEntry, containsKey, containsValue, entries, equals, hashCode, isEmpty, keys, keySet, put, putAll, putAll, remove, size, values

Methods inherited from class com.google.common.collect.ForwardingObject

toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.common.collect.ListMultimap

asMap, equals

Methods inherited from interface com.google.common.collect.Multimap

clear, containsEntry, containsKey, containsValue, entries, hashCode, isEmpty, keys, keySet, put, putAll, putAll, remove, size, values

Constructor Detail

ForwardingListMultimap

protected ForwardingListMultimap()

Constructor for use by subclasses.

Method Detail

delegate

protected abstract ListMultimap<K,V> delegate()

Description copied from class: ForwardingObject

Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:

delegate in class ForwardingMultimap<K,V>

get

public List<V> get(@Nullable
          K key)

Description copied from interface: Multimap

Returns a collection view containing the values associated with key in this multimap, if any. Note that even when (containsKey(key) is false, get(key) still returns an empty collection, not null.

Changes to the returned collection will update the underlying multimap, and vice versa.

Specified by:

get in interface ListMultimap<K,V>

Specified by:

get in interface Multimap<K,V>

Overrides:

get in class ForwardingMultimap<K,V>

Parameters:

key - key to search for in multimap

Returns:

a view collection containing the zero or more values that the key maps to

removeAll

public List<V> removeAll(@Nullable
                Object key)

Description copied from interface: Multimap

Removes all values associated with a given key.

Once this method returns, key will not be mapped to any values, so it will not appear in Multimap.keySet(), Multimap.asMap(), or any other views.

Specified by:

removeAll in interface ListMultimap<K,V>

Specified by:

removeAll in interface Multimap<K,V>

Overrides:

removeAll in class ForwardingMultimap<K,V>

Parameters:

key - key of entries to remove from the multimap

Returns:

the collection of removed values, or an empty collection if no values were associated with the provided key. The collection may be modifiable, but updating it will have no effect on the multimap.

replaceValues

public List<V> replaceValues(K key,
                    Iterable<? extends V> values)

Description copied from interface: Multimap

Stores a collection of values with the same key, replacing any existing values for that key.

If values is empty, this is equivalent to removeAll(key).

Specified by:

replaceValues in interface ListMultimap<K,V>

Specified by:

replaceValues in interface Multimap<K,V>

Overrides:

replaceValues in class ForwardingMultimap<K,V>

Parameters:

key - key to store in the multimap

values - values to store in the multimap

Returns:

the collection of replaced values, or an empty collection if no values were previously associated with the key. The collection may be modifiable, but updating it will have no effect on the multimap.