Package com.google.common.collect

Class EnumHashBiMap<K extends java.lang.Enum<K>,​V>

  • All Implemented Interfaces:
    BiMap<K,​V>, java.io.Serializable, java.util.Map<K,​V>
    @GwtCompatible(emulated=true)
public final class EnumHashBiMap<K extends java.lang.Enum<K>,​V>
extends ForwardingMap<K,​V>
    A BiMap backed by an EnumMap instance for keys-to-values, and a HashMap instance for values-to-keys. Null keys are not permitted, but null values are. An EnumHashBiMap and its inverse are both serializable.

    See the Guava User Guide article on BiMap.

    Since:
    2.0 (imported from Google Collections Library)
    See Also:
    Serialized Form

    • Method Detail

      • create

        public static <K extends java.lang.Enum<K>,​V> EnumHashBiMap<K,​V> create​(java.lang.Class<K> keyType)
        Returns a new, empty EnumHashBiMap using the specified key type.
        Parameters:
        keyType - the key type

      • create

        public static <K extends java.lang.Enum<K>,​V> EnumHashBiMap<K,​V> create​(java.util.Map<K,​? extends V> map)
        Constructs a new bimap with the same mappings as the specified map. If the specified map is an EnumHashBiMap or an EnumBiMap, the new bimap has the same key type as the input bimap. Otherwise, the specified map must contain at least one mapping, in order to determine the key type.
        Parameters:
        map - the map whose mappings are to be placed in this map
        Throws:
        java.lang.IllegalArgumentException - if map is not an EnumBiMap or an EnumHashBiMap instance and contains no mappings

      • put

        public V put​(K key,
             @Nullable
             V value)
        Description copied from interface: BiMap
        Specified by:
        put in interface BiMap<K extends java.lang.Enum<K>,​V>
        Specified by:
        put in interface java.util.Map<K extends java.lang.Enum<K>,​V>

      • forcePut

        public V forcePut​(K key,
                  @Nullable
                  V value)
        Description copied from interface: BiMap
        An alternate form of put that silently removes any existing entry with the value value before proceeding with the BiMap.put(K, V) operation. If the bimap previously contained the provided key-value mapping, this method has no effect.

        Note that a successful call to this method could cause the size of the bimap to increase by one, stay the same, or even decrease by one.

        Warning: If an existing entry with this value is removed, the key for that entry is discarded and not returned.

        Specified by:
        forcePut in interface BiMap<K extends java.lang.Enum<K>,​V>
        Parameters:
        key - the key with which the specified value is to be associated
        value - the value to be associated with the specified key
        Returns:
        the value which was previously associated with the key, which may be null, or null if there was no previous entry

      • keyType

        public java.lang.Class<K> keyType()
        Returns the associated key type.

      • delegate

        protected java.util.Map<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 ForwardingMap<K,​V>

      • containsValue

        public boolean containsValue​(@Nullable
                             java.lang.Object value)
        Specified by:
        containsValue in interface java.util.Map<K,​V>
        Overrides:
        containsValue in class ForwardingMap<K,​V>

      • remove

        public V remove​(@Nullable
                java.lang.Object key)
        Specified by:
        remove in interface java.util.Map<K,​V>
        Overrides:
        remove in class ForwardingMap<K,​V>

      • putAll

        public void putAll​(java.util.Map<? extends K,​? extends V> map)
        Description copied from interface: BiMap

        Warning: the results of calling this method may vary depending on the iteration order of map.

        Specified by:
        putAll in interface BiMap<K,​V>
        Specified by:
        putAll in interface java.util.Map<K,​V>
        Overrides:
        putAll in class ForwardingMap<K,​V>

      • clear

        public void clear()
        Specified by:
        clear in interface java.util.Map<K,​V>
        Overrides:
        clear in class ForwardingMap<K,​V>

      • inverse

        public BiMap<V,​K> inverse()
        Description copied from interface: BiMap
        Returns the inverse view of this bimap, which maps each of this bimap's values to its associated key. The two bimaps are backed by the same data; any changes to one will appear in the other.

        Note:There is no guaranteed correspondence between the iteration order of a bimap and that of its inverse.

        Specified by:
        inverse in interface BiMap<K,​V>
        Returns:
        the inverse view of this bimap

      • keySet

        public java.util.Set<K> keySet()
        Specified by:
        keySet in interface java.util.Map<K,​V>
        Overrides:
        keySet in class ForwardingMap<K,​V>

      • values

        public java.util.Set<V> values()
        Description copied from interface: BiMap

        Because a bimap has unique values, this method returns a Set, instead of the Collection specified in the Map interface.

        Specified by:
        values in interface BiMap<K,​V>
        Specified by:
        values in interface java.util.Map<K,​V>
        Overrides:
        values in class ForwardingMap<K,​V>

      • entrySet

        public java.util.Set<java.util.Map.Entry<K,​V>> entrySet()
        Specified by:
        entrySet in interface java.util.Map<K,​V>
        Overrides:
        entrySet in class ForwardingMap<K,​V>