Package com.google.common.collect

Class EnumHashBiMap<K extends Enum<K>,​V>

  • All Implemented Interfaces:
    BiMap<K,​V>, Serializable, Map<K,​V>
    @GwtCompatible(emulated=true)
public final class EnumHashBiMap<K extends 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
    Author:
    Mike Bostock
    See Also:
    Serialized Form

    • Method Detail

      • create

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

      • create

        public static <K extends Enum<K>,​V> EnumHashBiMap<K,​V> create​(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:
        IllegalArgumentException - if map is not an EnumBiMap or an EnumHashBiMap instance and contains no mappings

      • put

        @CanIgnoreReturnValue
public V put​(K key,
             @Nullable V value)
        Description copied from interface: java.util.Map
        Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)
        Specified by:
        put in interface BiMap<K extends Enum<K>,​V>
        Specified by:
        put in interface Map<K extends Enum<K>,​V>
        Parameters:
        key - key with which the specified value is to be associated
        value - value to be associated with the specified key
        Returns:
        the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

      • forcePut

        @CanIgnoreReturnValue
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 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 Class<K> keyType()
        Returns the associated key type.

      • delegate

        protected 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 Object value)
        Description copied from interface: java.util.Map
        Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that Objects.equals(value, v). This operation will probably require time linear in the map size for most implementations of the Map interface.
        Specified by:
        containsValue in interface Map<K,​V>
        Overrides:
        containsValue in class ForwardingMap<K,​V>
        Parameters:
        value - value whose presence in this map is to be tested
        Returns:
        true if this map maps one or more keys to the specified value

      • remove

        @CanIgnoreReturnValue
public V remove​(@Nullable Object key)
        Description copied from interface: java.util.Map
        Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed. (The map can contain at most one such mapping.)

        Returns the value to which this map previously associated the key, or null if the map contained no mapping for the key.

        If this map permits null values, then a return value of null does not necessarily indicate that the map contained no mapping for the key; it's also possible that the map explicitly mapped the key to null.

        The map will not contain a mapping for the specified key once the call returns.

        Specified by:
        remove in interface Map<K,​V>
        Overrides:
        remove in class ForwardingMap<K,​V>
        Parameters:
        key - key whose mapping is to be removed from the map
        Returns:
        the previous value associated with key, or null if there was no mapping for key.

      • putAll

        public void putAll​(Map<? extends K,​? extends V> map)
        Description copied from interface: java.util.Map
        Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress.
        Specified by:
        putAll in interface BiMap<K,​V>
        Specified by:
        putAll in interface Map<K,​V>
        Overrides:
        putAll in class ForwardingMap<K,​V>
        Parameters:
        map - mappings to be stored in this map

      • replaceAll

        public void replaceAll​(BiFunction<? super K,​? super V,​? extends V> function)
        Description copied from interface: java.util.Map
        Replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception. Exceptions thrown by the function are relayed to the caller.
        Specified by:
        replaceAll in interface Map<K,​V>
        Parameters:
        function - the function to apply to each entry

      • clear

        public void clear()
        Description copied from interface: java.util.Map
        Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
        Specified by:
        clear in interface 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 Set<K> keySet()
        Description copied from interface: java.util.Map
        Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.
        Specified by:
        keySet in interface Map<K,​V>
        Overrides:
        keySet in class ForwardingMap<K,​V>
        Returns:
        a set view of the keys contained in this map

      • values

        public Set<V> values()
        Description copied from interface: java.util.Map
        Returns a Collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.
        Specified by:
        values in interface BiMap<K,​V>
        Specified by:
        values in interface Map<K,​V>
        Overrides:
        values in class ForwardingMap<K,​V>
        Returns:
        a collection view of the values contained in this map

      • entrySet

        public Set<Map.Entry<K,​V>> entrySet()
        Description copied from interface: java.util.Map
        Returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.
        Specified by:
        entrySet in interface Map<K,​V>
        Overrides:
        entrySet in class ForwardingMap<K,​V>
        Returns:
        a set view of the mappings contained in this map