Class Multimaps.UnmodifiableMultimap<K,V>
- java.lang.Object
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- com.google.common.collect.ForwardingObject
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- com.google.common.collect.ForwardingMultimap<K,V>
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- com.google.common.collect.Multimaps.UnmodifiableMultimap<K,V>
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- All Implemented Interfaces:
Multimap<K,V>
,java.io.Serializable
- Direct Known Subclasses:
Multimaps.UnmodifiableListMultimap
,Multimaps.UnmodifiableSetMultimap
- Enclosing class:
- Multimaps
private static class Multimaps.UnmodifiableMultimap<K,V> extends ForwardingMultimap<K,V> implements java.io.Serializable
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Field Summary
Fields Modifier and Type Field Description (package private) Multimap<K,V>
delegate
(package private) java.util.Collection<java.util.Map.Entry<K,V>>
entries
(package private) Multiset<K>
keys
(package private) java.util.Set<K>
keySet
(package private) java.util.Map<K,java.util.Collection<V>>
map
private static long
serialVersionUID
(package private) java.util.Collection<V>
values
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Constructor Summary
Constructors Constructor Description UnmodifiableMultimap(Multimap<K,V> delegate)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.util.Map<K,java.util.Collection<V>>
asMap()
Returns a view of this multimap as aMap
from each distinct key to the nonempty collection of that key's associated values.void
clear()
Removes all key-value pairs from the multimap, leaving it empty.protected Multimap<K,V>
delegate()
Returns the backing delegate instance that methods are forwarded to.java.util.Collection<java.util.Map.Entry<K,V>>
entries()
Returns a view collection of all key-value pairs contained in this multimap, asMap.Entry
instances.void
forEach(java.util.function.BiConsumer<? super K,? super V> consumer)
Performs the given action for all key-value pairs contained in this multimap.java.util.Collection<V>
get(K key)
Returns a view collection of the values associated withkey
in this multimap, if any.Multiset<K>
keys()
Returns a view collection containing the key from each key-value pair in this multimap, without collapsing duplicates.java.util.Set<K>
keySet()
Returns a view collection of all distinct keys contained in this multimap.boolean
put(K key, V value)
Stores a key-value pair in this multimap.boolean
putAll(Multimap<? extends K,? extends V> multimap)
Stores all key-value pairs ofmultimap
in this multimap, in the order returned bymultimap.entries()
.boolean
putAll(K key, java.lang.Iterable<? extends V> values)
Stores a key-value pair in this multimap for each ofvalues
, all using the same key,key
.boolean
remove(java.lang.Object key, java.lang.Object value)
Removes a single key-value pair with the keykey
and the valuevalue
from this multimap, if such exists.java.util.Collection<V>
removeAll(java.lang.Object key)
Removes all values associated with the keykey
.java.util.Collection<V>
replaceValues(K key, java.lang.Iterable<? extends V> values)
Stores a collection of values with the same key, replacing any existing values for that key.java.util.Collection<V>
values()
Returns a view collection containing the value from each key-value pair contained in this multimap, without collapsing duplicates (sovalues().size() == size()
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Methods inherited from class com.google.common.collect.ForwardingMultimap
containsEntry, containsKey, containsValue, equals, hashCode, isEmpty, size
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Methods inherited from class com.google.common.collect.ForwardingObject
toString
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Field Detail
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keySet
transient java.util.Set<K> keySet
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values
transient java.util.Collection<V> values
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serialVersionUID
private static final long serialVersionUID
- See Also:
- Constant Field Values
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Method Detail
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delegate
protected Multimap<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 asForwardingSet.delegate()
. Concrete subclasses override this method to supply the instance being decorated.- Specified by:
delegate
in classForwardingMultimap<K,V>
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clear
public void clear()
Description copied from interface:Multimap
Removes all key-value pairs from the multimap, leaving it empty.
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asMap
public java.util.Map<K,java.util.Collection<V>> asMap()
Description copied from interface:Multimap
Returns a view of this multimap as aMap
from each distinct key to the nonempty collection of that key's associated values. Note thatthis.asMap().get(k)
is equivalent tothis.get(k)
only whenk
is a key contained in the multimap; otherwise it returnsnull
as opposed to an empty collection.Changes to the returned map or the collections that serve as its values will update the underlying multimap, and vice versa. The map does not support
put
orputAll
, nor do its entries supportsetValue
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entries
public java.util.Collection<java.util.Map.Entry<K,V>> entries()
Description copied from interface:Multimap
Returns a view collection of all key-value pairs contained in this multimap, asMap.Entry
instances.Changes to the returned collection or the entries it contains will update the underlying multimap, and vice versa. However, adding to the returned collection is not possible.
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forEach
public void forEach(java.util.function.BiConsumer<? super K,? super V> consumer)
Description copied from interface:Multimap
Performs the given action for all key-value pairs contained in this multimap. If an ordering is specified by theMultimap
implementation, actions will be performed in the order of iteration ofMultimap.entries()
. Exceptions thrown by the action are relayed to the caller.To loop over all keys and their associated value collections, write
Multimaps.asMap(multimap).forEach((key, valueCollection) -> action())
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get
public java.util.Collection<V> get(K key)
Description copied from interface:Multimap
Returns a view collection of the values associated withkey
in this multimap, if any. Note that whencontainsKey(key)
is false, this returns an empty collection, notnull
.Changes to the returned collection will update the underlying multimap, and vice versa.
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keys
public Multiset<K> keys()
Description copied from interface:Multimap
Returns a view collection containing the key from each key-value pair in this multimap, without collapsing duplicates. This collection has the same size as this multimap, andkeys().count(k) == get(k).size()
for allk
.Changes to the returned multiset will update the underlying multimap, and vice versa. However, adding to the returned collection is not possible.
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keySet
public java.util.Set<K> keySet()
Description copied from interface:Multimap
Returns a view collection of all distinct keys contained in this multimap. Note that the key set contains a key if and only if this multimap maps that key to at least one value.Changes to the returned set will update the underlying multimap, and vice versa. However, adding to the returned set is not possible.
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put
public boolean put(K key, V value)
Description copied from interface:Multimap
Stores a key-value pair in this multimap.Some multimap implementations allow duplicate key-value pairs, in which case
put
always adds a new key-value pair and increases the multimap size by 1. Other implementations prohibit duplicates, and storing a key-value pair that's already in the multimap has no effect.
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putAll
public boolean putAll(K key, java.lang.Iterable<? extends V> values)
Description copied from interface:Multimap
Stores a key-value pair in this multimap for each ofvalues
, all using the same key,key
. Equivalent to (but expected to be more efficient than):for (V value : values) { put(key, value); }
In particular, this is a no-op if
values
is empty.
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putAll
public boolean putAll(Multimap<? extends K,? extends V> multimap)
Description copied from interface:Multimap
Stores all key-value pairs ofmultimap
in this multimap, in the order returned bymultimap.entries()
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remove
public boolean remove(java.lang.Object key, java.lang.Object value)
Description copied from interface:Multimap
Removes a single key-value pair with the keykey
and the valuevalue
from this multimap, if such exists. If multiple key-value pairs in the multimap fit this description, which one is removed is unspecified.
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removeAll
public java.util.Collection<V> removeAll(java.lang.Object key)
Description copied from interface:Multimap
Removes all values associated with the keykey
.Once this method returns,
key
will not be mapped to any values, so it will not appear inMultimap.keySet()
,Multimap.asMap()
, or any other views.
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replaceValues
public java.util.Collection<V> replaceValues(K key, java.lang.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 toremoveAll(key)
.- Specified by:
replaceValues
in interfaceMultimap<K,V>
- Overrides:
replaceValues
in classForwardingMultimap<K,V>
- 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.
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values
public java.util.Collection<V> values()
Description copied from interface:Multimap
Returns a view collection containing the value from each key-value pair contained in this multimap, without collapsing duplicates (sovalues().size() == size()
).Changes to the returned collection will update the underlying multimap, and vice versa. However, adding to the returned collection is not possible.
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