Method Detail

• public boolean asBoolean()

  A null object coerces to false.

  Returns:

  false

• public Object asType(Class c)

  Type conversion method for null.

  Returns:

  null

• @Override public Object clone()

  Since this is implemented as a singleton, avoid the use of the clone method.

  throws:

  NullPointerException

  Returns:

  never

• @Override public boolean equals(Object o)

  null is only equal to null.

  Parameters:

  o - the reference object with which to compare

  Returns:

  true if this object is the same as the to argument

• public static NullObject getNullObject()

  Returns the NullObject reference.

  Returns:

  the null object

• @Override public Object getProperty(String name)

  Tries to get a property on null, which fails.

  throws:

  NullPointerException

  Returns:

  never

• @Override public int hashCode()

  throws:

  NullPointerException

  Returns:

  never

• @Override public Object invokeMethod(String name, Object arguments)

  Tries to invoke a method on null, which falis.

  throws:

  NullPointerException

  Returns:

  never

• public boolean is(Object o)

  Tests for equal references.

  Returns:

  true if object is null

• public Iterator iterator()

  Provides ability to iterate on null.

  Returns:

  an empty iterator

• public Object plus(Object o)

  Fallback for null+null. The plus(java.lang.String) variant catches the case of adding a non-null String to null.

  throws:

  NullPointerException

  Returns:

  never

• public Object plus(String s)

  Allows to add a String to null. The result is concatenated String of the result of calling toString() on this object and the String in the parameter.

  Returns:

  the concatenated string

• @Override public void setProperty(String name, Object value)

  Tries to set a property on null, which fails.

  throws:

  NullPointerException

• @Override public String toString()

• <T> public T with(Closure<T> closure)

  Allows the closure to be called for NullObject.

  Parameters:

  closure - the closure to call on the object

  Returns:

  result of calling the closure