Method checkNotNull

output/java_guava/1.4.13/Preconditions.java:823–829

Ensures that an object reference passed as a parameter to the calling method is not null. @param reference an object reference @return the non-null reference that was validated @throws NullPointerException if reference is null

(T reference)

   */

    @CanIgnoreReturnValue
    public static <T> T checkNotNull(T reference) {
    if (reference == null) {
                      throw new NullPointerException();
    }
    return reference;
    }

  /**
   * Ensures that an object reference passed as a parameter to the calling method is not null.