Method Detail

• nullSafeClassEquals

  public static boolean nullSafeClassEquals(Object object1,
                            Object object2)

  Compares the classes of the given Objects and returns true if they are identical. This check is typically used at the start of an equals implementation.

  Returns:

  true if object1 is the same class (exact same, not just assignable subclass) as object2. False otherwise.

• nullSafeHashCode

  public static int nullSafeHashCode(Object toHash)

  Returns:

  0 if toHash is null, otherwise returns toHash.hashCode()

• nullSafeEquals

  public static boolean nullSafeEquals(Object object1,
                       Object object2)

  Performs an equals() check on two Objects, either (or both) of which may be null.

  This method returns true if both Objects are null. Whether, strictly speaking, null == null is debatable, but this approach is useful for comparing two parent Objects who have both left certain properties as null. Generally we want those two parent Objects to be considered equal.

  Returns:

  true if both object1 and object2 are null, false if one is null and the other is not, otherwise returns object1.equals( object2 )

• nullSafeCompareTo

  public static <T> int nullSafeCompareTo(Comparable<T> object1,
                          T object2)

  Returns:

  0 if both object1 and object2 are null, -1 if object1 is null but object2 is not (sorts nulls to the top), 1 if object2 is null but object1 is not, otherwise returns object1.compareTo( object2 )