Package com.google.common.collect

Class ImmutableSetMultimap<K,​V>

  • All Implemented Interfaces:
    Multimap<K,​V>, SetMultimap<K,​V>, java.io.Serializable
    @GwtCompatible(serializable=true,
               emulated=true)
public class ImmutableSetMultimap<K,​V>
extends ImmutableMultimap<K,​V>
implements SetMultimap<K,​V>
    An immutable SetMultimap with reliable user-specified key and value iteration order. Does not permit null keys or values.

    Unlike Multimaps.unmodifiableSetMultimap(SetMultimap), which is a view of a separate multimap which can still change, an instance of ImmutableSetMultimap contains its own data and will never change. ImmutableSetMultimap is convenient for public static final multimaps ("constant multimaps") and also lets you easily make a "defensive copy" of a multimap provided to your class by a caller.

    Note: Although this class is not final, it cannot be subclassed as it has no public or protected constructors. Thus, instances of this class are guaranteed to be immutable.

    See the Guava User Guide article on immutable collections.

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

    • Method Detail

      • of

        public static <K,​V> ImmutableSetMultimap<K,​V> of​(K k1,
                                                             V v1)
        Returns an immutable multimap containing a single entry.

      • of

        public static <K,​V> ImmutableSetMultimap<K,​V> of​(K k1,
                                                             V v1,
                                                             K k2,
                                                             V v2)
        Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

      • of

        public static <K,​V> ImmutableSetMultimap<K,​V> of​(K k1,
                                                             V v1,
                                                             K k2,
                                                             V v2,
                                                             K k3,
                                                             V v3)
        Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

      • of

        public static <K,​V> ImmutableSetMultimap<K,​V> of​(K k1,
                                                             V v1,
                                                             K k2,
                                                             V v2,
                                                             K k3,
                                                             V v3,
                                                             K k4,
                                                             V v4)
        Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

      • of

        public static <K,​V> ImmutableSetMultimap<K,​V> of​(K k1,
                                                             V v1,
                                                             K k2,
                                                             V v2,
                                                             K k3,
                                                             V v3,
                                                             K k4,
                                                             V v4,
                                                             K k5,
                                                             V v5)
        Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

      • copyOf

        public static <K,​V> ImmutableSetMultimap<K,​V> copyOf​(Multimap<? extends K,​? extends V> multimap)
        Returns an immutable set multimap containing the same mappings as multimap. The generated multimap's key and value orderings correspond to the iteration ordering of the multimap.asMap() view. Repeated occurrences of an entry in the multimap after the first are ignored.

        Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.

        Throws:
        java.lang.NullPointerException - if any key or value in multimap is null

      • get

        public ImmutableSet<V> get​(@Nullable
                           K key)
        Returns an immutable set of the values for the given key. If no mappings in the multimap have the provided key, an empty immutable set is returned. The values are in the same order as the parameters used to build this multimap.
        Specified by:
        get in interface Multimap<K,​V>
        Specified by:
        get in interface SetMultimap<K,​V>
        Specified by:
        get in class ImmutableMultimap<K,​V>

      • inverse

        public ImmutableSetMultimap<V,​K> inverse()
        Returns an immutable multimap which is the inverse of this one. For every key-value mapping in the original, the result will have a mapping with key and value reversed.

        Because an inverse of a set multimap cannot contain multiple pairs with the same key and value, this method returns an ImmutableSetMultimap rather than the ImmutableMultimap specified in the ImmutableMultimap class.

        Specified by:
        inverse in class ImmutableMultimap<K,​V>
        Since:
        11.0

      • removeAll

        @Deprecated
public ImmutableSet<V> removeAll​(java.lang.Object key)
        Deprecated.
        Unsupported operation.
        Guaranteed to throw an exception and leave the multimap unmodified.
        Specified by:
        removeAll in interface Multimap<K,​V>
        Specified by:
        removeAll in interface SetMultimap<K,​V>
        Overrides:
        removeAll in class ImmutableMultimap<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.
        Throws:
        java.lang.UnsupportedOperationException - always

      • replaceValues

        @Deprecated
public ImmutableSet<V> replaceValues​(K key,
                                     java.lang.Iterable<? extends V> values)
        Deprecated.
        Unsupported operation.
        Guaranteed to throw an exception and leave the multimap unmodified.
        Specified by:
        replaceValues in interface Multimap<K,​V>
        Specified by:
        replaceValues in interface SetMultimap<K,​V>
        Overrides:
        replaceValues in class ImmutableMultimap<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.
        Throws:
        java.lang.UnsupportedOperationException - always

      • entries

        public ImmutableSet<java.util.Map.Entry<K,​V>> entries()
        Returns an immutable collection of all key-value pairs in the multimap. Its iterator traverses the values for the first key, the values for the second key, and so on.
        Specified by:
        entries in interface Multimap<K,​V>
        Specified by:
        entries in interface SetMultimap<K,​V>
        Overrides:
        entries in class ImmutableMultimap<K,​V>

      • isEmpty

        public boolean isEmpty()
        Description copied from interface: Multimap
        Returns true if this multimap contains no key-value pairs. Equivalent to size() == 0, but can in some cases be more efficient.
        Specified by:
        isEmpty in interface Multimap<K,​V>

      • containsEntry

        public boolean containsEntry​(@Nullable
                             java.lang.Object key,
                             @Nullable
                             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>

      • equals

        public boolean equals​(@Nullable
                      java.lang.Object object)
        Description copied from interface: Multimap
        Compares the specified object with this multimap for equality. Two multimaps are equal when their map views, as returned by Multimap.asMap(), are also equal.

        In general, two multimaps with identical key-value mappings may or may not be equal, depending on the implementation. For example, two SetMultimap instances with the same key-value mappings are equal, but equality of two ListMultimap instances depends on the ordering of the values for each key.

        A non-empty SetMultimap cannot be equal to a non-empty ListMultimap, since their Multimap.asMap() views contain unequal collections as values. However, any two empty multimaps are equal, because they both have empty Multimap.asMap() views.

        Specified by:
        equals in interface Multimap<K,​V>
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Returns the hash code for this multimap.

        The hash code of a multimap is defined as the hash code of the map view, as returned by Multimap.asMap().

        Specified by:
        hashCode in interface Multimap<K,​V>
        Overrides:
        hashCode in class java.lang.Object
        See Also:
        Map.hashCode()

      • toString

        public java.lang.String toString()
        Returns a string representation of the multimap, generated by calling toString on the map returned by Multimap.asMap().
        Overrides:
        toString in class java.lang.Object
        Returns:
        a string representation of the multimap