Method copyOf

corpus/java/training/guava/collect/ImmutableMap.java:318–334

Returns an immutable map containing the same entries as map. If map somehow contains entries with duplicate keys (for example, if it is a SortedMap whose comparator is not consistent with equals ), the results of this method are undefined. Despite the method name, t

(Map<? extends K, ? extends V> map)

   * @throws NullPointerException if any key or value in {@code map} is null
   */
  public static <K, V> ImmutableMap<K, V> copyOf(Map<? extends K, ? extends V> map) {
    if ((map instanceof ImmutableMap) && !(map instanceof ImmutableSortedMap)) {
      // TODO(lowasser): Make ImmutableMap.copyOf(immutableBiMap) call copyOf()
      // on the ImmutableMap delegate(), rather than the bimap itself

      @SuppressWarnings("unchecked") // safe since map is not writable
      ImmutableMap<K, V> kvMap = (ImmutableMap<K, V>) map;
      if (!kvMap.isPartialView()) {
        return kvMap;
      }
    } else if (map instanceof EnumMap) {
      @SuppressWarnings("unchecked") // safe since map is not writable
      ImmutableMap<K, V> kvMap = (ImmutableMap<K, V>) copyOfEnumMap((EnumMap<?, ?>) map);
      return kvMap;
    }
    return copyOf(map.entrySet());
  }

  /**
   * Returns an immutable map containing the specified entries.  The returned