public class NullObject extends GroovyObjectSupport
| Type Params | Return Type | Name and description |
|---|---|---|
|
public boolean |
asBoolean()A null object always coerces to false. |
|
public Object |
asType(Class c)Type conversion method for null. |
|
public Object |
clone()Since this is implemented as a singleton, we should avoid the use of the clone method |
|
public boolean |
equals(Object to)null is only equal to null |
|
public static NullObject |
getNullObject()get the NullObject reference |
|
public Object |
getProperty(String property)Tries to get a property on null, which will always fail |
|
public int |
hashCode() |
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public Object |
invokeMethod(String name, Object args)Tries to invoke a method on null, which will always fail |
|
public boolean |
is(Object other)The method "is" is used to test for equal references. |
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public Iterator |
iterator()iterator() method to be able to iterate on null. |
|
public Object |
plus(String s)Allows to add a String to null. |
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public Object |
plus(Object o)Fallback for null+null. |
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public void |
setProperty(String property, Object newValue)Tries to set a property on null, which will always fail |
|
public String |
toString() |
<T> |
public T |
with(Closure<T> closure)Allows the closure to be called for NullObject |
| Methods inherited from class | Name |
|---|---|
class GroovyObjectSupport |
getMetaClass, setMetaClass |
A null object always coerces to false.
Type conversion method for null.
c - - the class to convert toSince this is implemented as a singleton, we should avoid the use of the clone method
null is only equal to null
to - - the reference object with which to compareget the NullObject reference
Tries to get a property on null, which will always fail
property - - the property to getTries to invoke a method on null, which will always fail
name - the name of the method to invokeargs - - arguments to the methodThe method "is" is used to test for equal references. This method will return true only if the given parameter is null
other - - the object to testiterator() method to be able to iterate on null. Note: this part is from Invoker
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.
s - - the String to concatenateFallback for null+null. The result is always a NPE. The plus(String) version will catch the case of adding a non-null String to null.
o - - the ObjectTries to set a property on null, which will always fail
property - - the property to setnewValue - - the new value of the propertyAllows the closure to be called for NullObject
closure - the closure to call on the object