com.atlassian.velocity.htmlsafe.util
Class Check

java.lang.Object
  com.atlassian.velocity.htmlsafe.util.Check

public final class Check
extends java.lang.Object

Utility to perform checks on parameters.

Constructor Summary

Check()

Method Summary

static void	argument(boolean expression) Ensures the truth of an expression involving one or more parameters to the calling method.
static void	argument(boolean expression, java.lang.Object errorMessage) Ensures the truth of an expression involving one or more parameters to the calling method.
static <T> T	notNull(T reference) Check that reference is not null.
static <T> T	notNull(T reference, java.lang.Object errorMessage) Check that reference is not null.

Methods inherited from class java.lang.Object

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

Constructor Detail

Check

public Check()

Method Detail

notNull

public static <T> T notNull(T reference)

Check that reference is not null. If it is, throw a NullPointerException.

Parameters:

reference - reference to check is null or not

Returns:

reference so it may be used

Throws:

java.lang.NullPointerException - if reference is null

notNull

public static <T> T notNull(T reference,
                            java.lang.Object errorMessage)

Check that reference is not null. If it is, throw a NullPointerException.

Parameters:

reference - reference to check is null or not

errorMessage - message passed to the NullPointerException constructor to give more context when debugging

Returns:

reference so it may be used

Throws:

java.lang.NullPointerException - if reference is null

argument

public static void argument(boolean expression)

Ensures the truth of an expression involving one or more parameters to the calling method.

Parameters:

expression - a boolean expression

Throws:

java.lang.IllegalArgumentException - if expression is false

argument

public static void argument(boolean expression,
                            java.lang.Object errorMessage)

Ensures the truth of an expression involving one or more parameters to the calling method.

Parameters:

expression - a boolean expression

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

Throws:

java.lang.IllegalArgumentException - if expression is false