Package com.google.common.collect

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

  • All Implemented Interfaces:
    BiMap<K,​V>, java.io.Serializable, java.util.Map<K,​V>
    @GwtCompatible(emulated=true)
public final class EnumBiMap<K extends java.lang.Enum<K>,​V extends java.lang.Enum<V>>
extends ForwardingMap<K,​V>
    A BiMap backed by two EnumMap instances. Null keys and values are not permitted. An EnumBiMap 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 java.lang.Enum<K>,​V extends java.lang.Enum<V>> EnumBiMap<K,​V> create​(java.lang.Class<K> keyType,
                                                                                                          java.lang.Class<V> valueType)
        Returns a new, empty EnumBiMap using the specified key and value types.
        Parameters:
        keyType - the key type
        valueType - the value type

      • create

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

      • 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 extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>

      • forcePut

        @CanIgnoreReturnValue
@CheckForNull
public V forcePut​(K key,
                  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 @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>
        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 that was previously associated with the key, or null if there was no previous entry. (If the bimap contains null values, then forcePut, like put, returns null both if the key is absent and if it is present with a null value.)

      • 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 extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>
        Specified by:
        putAll in interface java.util.Map<K extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>
        Overrides:
        putAll in class ForwardingMap<K extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>

      • clear

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

      • 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 extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>
        Returns:
        the inverse view of this bimap

      • keySet

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

      • 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 extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>
        Specified by:
        values in interface java.util.Map<K extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>
        Overrides:
        values in class ForwardingMap<K extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>

      • entrySet

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