/** * Returns a newly-created immutable bimap. * * @throws IllegalArgumentException if duplicate keys or values were added */ @Override public ImmutableBiMap<K, V> build() { return fromEntries(entries); } }
/** * Returns an immutable bimap containing the same entries as {@code map}. If * {@code map} somehow contains entries with duplicate keys (for example, if * it is a {@code SortedMap} whose comparator is not <i>consistent with * equals</i>), the results of this method are undefined. * * <p>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 IllegalArgumentException if two keys have the same value * @throws NullPointerException if any key or value in {@code map} is null */ public static <K, V> ImmutableBiMap<K, V> copyOf( Map<? extends K, ? extends V> map) { if (map instanceof ImmutableBiMap) { @SuppressWarnings("unchecked") // safe since map is not writable ImmutableBiMap<K, V> bimap = (ImmutableBiMap<K, V>) map; // TODO(user): if we need to make a copy of a BiMap because the // forward map is a view, don't make a copy of the non-view delegate map if (!bimap.isPartialView()) { return bimap; } } return fromEntries(ImmutableList.copyOf(map.entrySet())); }