patterntesting.runtime
Class NullConstants

java.lang.Object
  patterntesting.runtime.NullConstants

public final class NullConstants
extends Object

This class contains some constants (like a NULL_STRING) as constant. It can be statically imported.

Since:

13.06.2009

Version:

$Revision: 1.2 $

Author:

oliver

Field Summary

static Date	NULL_DATE You need a null date and don't want to use null?
static Throwable	NULL_EXCEPTION You need a null exception and don't want to use null?
static File	NULL_FILE You need a null file and don't want to use null?
static Object	NULL_OBJECT If you have a method with a list of arguments where some arguments are optional you can provide the method with different signatures (good idea, but not always feasible) admit null arguments and handle it in the methode (not a good idea because it can happen accidentally) use this special NULL_OBJECT object to mark an argument as optional Unfortunately this works only for object as argument.
static String	NULL_STRING You need a null string and don't want to use null?
static Throwable	NULL_THROWABLE You need a null throwable and don't want to use null?

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NULL_OBJECT

public static final Object NULL_OBJECT

If you have a method with a list of arguments where some arguments are optional you can

• provide the method with different signatures (good idea, but not always feasible)
• admit null arguments and handle it in the methode (not a good idea because it can happen accidentally)
• use this special NULL_OBJECT object to mark an argument as optional

Unfortunately this works only for object as argument. For String as argument you can use NULL_STRING.

See Also:

NULL_STRING

NULL_STRING

public static final String NULL_STRING

You need a null string and don't want to use null? Use NULL_STRING and you can write code like

 if (name == NULL_STRING) ...
 

See Also:

Constant Field Values

NULL_FILE

public static final File NULL_FILE

You need a null file and don't want to use null? Use NULL_FILE and you can write code like

 if (name == NULL_STRING) ...
 

NULL_THROWABLE

public static final Throwable NULL_THROWABLE

You need a null throwable and don't want to use null? Use NULL_THROWABLE and you can write code like

 if (name == NULL_THROWABLE) ...
 

NULL_EXCEPTION

public static final Throwable NULL_EXCEPTION

You need a null exception and don't want to use null? Use NULL_EXCEPTION and you can write code like

 if (name == NULL_EXCEPTION) ...
 

NULL_DATE

public static final Date NULL_DATE

You need a null date and don't want to use null? Use NULL_DATE and you can write code like

 if (name == NULL_DATE) ...
 

The NULL_DATE is defined here as 1.1.1970 (the epoch).