Method key

src/main/java/gate/util/RBTreeMap.java:426–430

Returns the key corresonding to the specified Entry. Throw NoSuchElementException if the Entry is null .

(Entry<X,Y> e)

    * NoSuchElementException if the Entry is <tt>null</tt>.
    */
  private static <X,Y> X key(Entry<X,Y> e) {
      if (e==null)
          throw new NoSuchElementException();
      return e.key;
  }

  /**
    * Associates the specified value with the specified key in this map.