org.jdesktop.swingx.util

Class Contract

java.lang.Object

org.jdesktop.swingx.util.Contract

public class Contract
extends Object

Utility class for checking contracts.

Author:

Jeanette Winzenburg

Method Summary

Modifier and Type	Method and Description
static <T> T	asNotNull(T input, String message) Tests the input parameter against null.

Methods inherited from class java.lang.Object

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

Method Detail

asNotNull

public static <T> T asNotNull(T input,
                              String message)

Tests the input parameter against null. If the input is an array, checks all of its elements as well. Returns the unchanged parameter if not null, throws a NullPointerException otherwise.

PENDING: type of exception? there are raging debates, some favour an IllegalArgument?

PENDING: the implementation uses a unchecked type cast to an array. can we do better, how?

Type Parameters:

T - the type of the input parameter

Parameters:

input - the argument to check against null.

message - the text of the exception if the argument is null

Returns:

the input if not null

Throws:

NullPointerException - if input is null