org.apache.wicket.util.lang

Class Args

java.lang.Object

org.apache.wicket.util.lang.Args

public class Args
extends Object

Class with methods for asserting conditions on arguments.

Constructor Summary

Constructors

Constructor and Description
Args()

Method Summary

Modifier and Type	Method and Description
static boolean	isFalse(boolean argument, String msg, Object... params) Check if argument is false
static boolean	isTrue(boolean argument, String msg, Object... params) Check if argument is true
static <T extends CharSequence> T	notEmpty(T argument, String name) Checks argument is not empty (not null and has a non-whitespace character)
static <T extends Collection<?>> T	notEmpty(T collection, String name) Checks argument is not null or empty
static <T extends Collection<?>> T	notEmpty(T collection, String message, Object... params) Checks argument is not null or empty
static <T> T	notNull(T argument, String name) Checks argument is not null
static <T extends Comparable<? super T>> T	withinRange(T min, T max, T value, String name) Checks if argument is within a range

Methods inherited from class java.lang.Object

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

Constructor Detail

Args

public Args()

Method Detail

notNull

public static <T> T notNull(T argument,
                            String name)

Checks argument is not null

Type Parameters:

T -

Parameters:

argument -

name -

Returns:

The 'argument' parameter

Throws:

IllegalArgumentException

notEmpty

public static <T extends CharSequence> T notEmpty(T argument,
                                                  String name)

Checks argument is not empty (not null and has a non-whitespace character)

Type Parameters:

T - the type of the argument to check for emptiness

Parameters:

argument - the argument to check for emptiness

name - the name to use in the error message

Returns:

The argument parameter if not empty

Throws:

IllegalArgumentException - when the passed argument is empty

notEmpty

public static <T extends Collection<?>> T notEmpty(T collection,
                                                   String message,
                                                   Object... params)

Checks argument is not null or empty

Parameters:

collection -

message -

params -

Returns:

the {code collection}

Throws:

IllegalArgumentException - if the passed collection is either null or empty

notEmpty

public static <T extends Collection<?>> T notEmpty(T collection,
                                                   String name)

Checks argument is not null or empty

Parameters:

collection -

name -

Returns:

the {code collection}

Throws:

IllegalArgumentException - if the passed collection is either null or empty

withinRange

public static <T extends Comparable<? super T>> T withinRange(T min,
                                                              T max,
                                                              T value,
                                                              String name)

Checks if argument is within a range

Type Parameters:

T -

Parameters:

min -

max -

value -

name -

Returns:

the {code value}

Throws:

IllegalArgumentException

isTrue

public static boolean isTrue(boolean argument,
                             String msg,
                             Object... params)

Check if argument is true

Parameters:

argument -

msg -

params -

Returns:

argument

isFalse

public static boolean isFalse(boolean argument,
                              String msg,
                              Object... params)

Check if argument is false

Parameters:

argument -

msg -

params -

Returns:

argument