Package com.google.common.collect

Class Multimaps.MapMultimap<K,​V>

    • Field Summary

      Fields 
      Modifier and Type Field Description
      (package private) java.util.Map<K,​V> map  
      private static long serialVersionUID  

    • Constructor Summary

      Constructors 
      Constructor Description
      MapMultimap​(java.util.Map<K,​V> map)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void clear()
      Removes all key-value pairs from the multimap, leaving it empty.
      boolean containsEntry​(java.lang.Object key, java.lang.Object value)
      Returns true if this multimap contains at least one key-value pair with the key key and the value value.
      boolean containsKey​(java.lang.Object key)
      Returns true if this multimap contains at least one key-value pair with the key key.
      boolean containsValue​(java.lang.Object value)
      Returns true if this multimap contains at least one key-value pair with the value value.
      (package private) java.util.Map<K,​java.util.Collection<V>> createAsMap()  
      (package private) java.util.Collection<java.util.Map.Entry<K,​V>> createEntries()  
      (package private) Multiset<K> createKeys()  
      (package private) java.util.Set<K> createKeySet()  
      (package private) java.util.Collection<V> createValues()  
      java.util.Set<java.util.Map.Entry<K,​V>> entries()
      Returns a view collection of all key-value pairs contained in this multimap, as Map.Entry instances.
      (package private) java.util.Iterator<java.util.Map.Entry<K,​V>> entryIterator()  
      java.util.Set<V> get​(K key)
      Returns a view collection of the values associated with key in this multimap, if any.
      int hashCode()
      Returns the hash code for 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 of multimap in this multimap, in the order returned by multimap.entries().
      boolean putAll​(K key, java.lang.Iterable<? extends V> values)
      Stores a key-value pair in this multimap for each of values, all using the same key, key.
      boolean remove​(java.lang.Object key, java.lang.Object value)
      Removes a single key-value pair with the key key and the value value from this multimap, if such exists.
      java.util.Set<V> removeAll​(java.lang.Object key)
      Removes all values associated with the key key.
      java.util.Set<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.
      int size()
      Returns the number of key-value pairs in this multimap.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • map

        final java.util.Map<K,​V> map

    • Constructor Detail

      • MapMultimap

        MapMultimap​(java.util.Map<K,​V> map)

    • Method Detail

      • size

        public int size()
        Description copied from interface: Multimap
        Returns the number of key-value pairs in this multimap.

        Note: this method does not return the number of distinct keys in the multimap, which is given by keySet().size() or asMap().size(). See the opening section of the Multimap class documentation for clarification.

        Specified by:
        size in interface Multimap<K,​V>

      • containsKey

        public boolean containsKey​(java.lang.Object key)
        Description copied from interface: Multimap
        Returns true if this multimap contains at least one key-value pair with the key key.
        Specified by:
        containsKey in interface Multimap<K,​V>

      • containsValue

        public boolean containsValue​(java.lang.Object value)
        Description copied from interface: Multimap
        Returns true if this multimap contains at least one key-value pair with the value value.
        Specified by:
        containsValue in interface Multimap<K,​V>
        Overrides:
        containsValue in class AbstractMultimap<K,​V>

      • containsEntry

        public boolean containsEntry​(java.lang.Object key,
                             java.lang.Object value)
        Description copied from interface: Multimap
        Returns true if this multimap contains at least one key-value pair with the key key and the value value.
        Specified by:
        containsEntry in interface Multimap<K,​V>
        Overrides:
        containsEntry in class AbstractMultimap<K,​V>

      • get

        public java.util.Set<V> get​(K key)
        Description copied from interface: SetMultimap
        Returns a view collection of the values associated with key in this multimap, if any. Note that when containsKey(key) is false, this returns an empty collection, not null.

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

        Because a SetMultimap has unique values for a given key, this method returns a Set, instead of the Collection specified in the Multimap interface.

        Specified by:
        get in interface Multimap<K,​V>
        Specified by:
        get in interface SetMultimap<K,​V>

      • 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.

        Specified by:
        put in interface Multimap<K,​V>
        Overrides:
        put in class AbstractMultimap<K,​V>
        Returns:
        true if the method increased the size of the multimap, or false if the multimap already contained the key-value pair and doesn't allow duplicates

      • 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 of values, 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.

        Specified by:
        putAll in interface Multimap<K,​V>
        Overrides:
        putAll in class AbstractMultimap<K,​V>
        Returns:
        true if the multimap changed

      • putAll

        public boolean putAll​(Multimap<? extends K,​? extends V> multimap)
        Description copied from interface: Multimap
        Stores all key-value pairs of multimap in this multimap, in the order returned by multimap.entries().
        Specified by:
        putAll in interface Multimap<K,​V>
        Overrides:
        putAll in class AbstractMultimap<K,​V>
        Returns:
        true if the multimap changed

      • replaceValues

        public java.util.Set<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 to removeAll(key).

        Specified by:
        replaceValues in interface Multimap<K,​V>
        Specified by:
        replaceValues in interface SetMultimap<K,​V>
        Overrides:
        replaceValues in class AbstractMultimap<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.

      • 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 key key and the value value from this multimap, if such exists. If multiple key-value pairs in the multimap fit this description, which one is removed is unspecified.
        Specified by:
        remove in interface Multimap<K,​V>
        Overrides:
        remove in class AbstractMultimap<K,​V>
        Returns:
        true if the multimap changed

      • removeAll

        public java.util.Set<V> removeAll​(java.lang.Object key)
        Description copied from interface: SetMultimap
        Removes all values associated with the key 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.

        Because a SetMultimap has unique values for a given key, this method returns a Set, instead of the Collection specified in the Multimap interface.

        Specified by:
        removeAll in interface Multimap<K,​V>
        Specified by:
        removeAll in interface SetMultimap<K,​V>
        Returns:
        the values that were removed (possibly empty). The returned collection may be modifiable, but updating it will have no effect on the multimap.

      • clear

        public void clear()
        Description copied from interface: Multimap
        Removes all key-value pairs from the multimap, leaving it empty.
        Specified by:
        clear in interface Multimap<K,​V>

      • entries

        public java.util.Set<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, as Map.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.

        Specified by:
        entries in interface Multimap<K,​V>
        Specified by:
        entries in interface SetMultimap<K,​V>
        Overrides:
        entries in class AbstractMultimap<K,​V>