com.google.common.collect

Class ForwardingSetMultimap<K,V>

java.lang.Object

com.google.common.collect.ForwardingObject

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

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

All Implemented Interfaces:

Multimap<K,V>, SetMultimap<K,V>

Direct Known Subclasses:

ForwardingSortedSetMultimap

@GwtCompatible
public abstract class ForwardingSetMultimap<K,V>
extends ForwardingMultimap<K,V>
implements SetMultimap<K,V>

A set multimap which forwards all its method calls to another set 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

Constructor and Description
ForwardingSetMultimap()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract SetMultimap<K,V>	delegate() Returns the backing delegate instance that methods are forwarded to.
Set<Map.Entry<K,V>>	entries() Returns a collection of all key-value pairs.
Set<V>	get(K key) Returns a collection view containing the values associated with key in this multimap, if any.
Set<V>	removeAll(Object key) Removes all values associated with a given key.
Set<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, 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.SetMultimap

asMap, equals

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

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

Constructor Detail

ForwardingSetMultimap

public ForwardingSetMultimap()

Method Detail

delegate

protected abstract SetMultimap<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>

entries

public Set<Map.Entry<K,V>> entries()

Description copied from interface: Multimap

Returns a collection of all key-value pairs. Changes to the returned collection will update the underlying multimap, and vice versa. The entries collection does not support the add or addAll operations.

Specified by:

entries in interface Multimap<K,V>

Specified by:

entries in interface SetMultimap<K,V>

Overrides:

entries in class ForwardingMultimap<K,V>

Returns:

collection of map entries consisting of key-value pairs

get

public Set<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 Multimap<K,V>

Specified by:

get in interface SetMultimap<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 Set<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 Multimap<K,V>

Specified by:

removeAll in interface SetMultimap<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 Set<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 Multimap<K,V>

Specified by:

replaceValues in interface SetMultimap<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.