Method containsEntryImpl

guava/src/com/google/common/collect/Maps.java:3819–3825

Implements {@code Collection.contains} safely for forwarding collections of map entries. If {@code o} is an instance of {@code Entry}, it is wrapped using {@link #unmodifiableEntry} to protect against a possible nefarious equals method. <p>Note that {@code c} is the backing (delegate) collection, r

(
      Collection<Entry<K, V>> c, @Nullable Object o)

   * @return {@code true} if {@code c} contains {@code o}
   */
  static <K extends @Nullable Object, V extends @Nullable Object> boolean containsEntryImpl(
      Collection<Entry<K, V>> c, @Nullable Object o) {
    if (!(o instanceof Entry)) {
      return false;
    }
    return c.contains(unmodifiableEntry((Entry<?, ?>) o));
  }

  /**
   * Implements {@code Collection.remove} safely for forwarding collections of map entries. If