org.apache.logging.log4j.core.util

Class Assert

java.lang.Object

org.apache.logging.log4j.core.util.Assert

public final class Assert
extends Object

Utility class providing common validation logic.

Method Summary

Modifier and Type	Method and Description
static boolean	isEmpty(Object o) Checks if an object has empty semantics.
static boolean	isNonEmpty(Object o) Opposite of isEmpty(Object).
static <T> T	requireNonEmpty(T value) Checks a value for emptiness and throws an IllegalArgumentException if it's empty.
static <T> T	requireNonEmpty(T value, String message) Checks a value for emptiness and throws an IllegalArgumentException if it's empty.
static int	valueIsAtLeast(int value, int minValue)

Methods inherited from class java.lang.Object

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

Method Detail

isEmpty

public static boolean isEmpty(Object o)

Checks if an object has empty semantics. The following scenarios are considered empty:

• null
• empty CharSequence
• empty array
• empty Iterable
• empty Map

Parameters:

o - value to check for emptiness

Returns:

true if the value is empty, false otherwise

Since:

2.8

isNonEmpty

public static boolean isNonEmpty(Object o)

Opposite of isEmpty(Object).

Parameters:

o - value to check for non-emptiness

Returns:

true if the value is non-empty, false otherwise

Since:

2.8

requireNonEmpty

public static <T> T requireNonEmpty(T value)

Checks a value for emptiness and throws an IllegalArgumentException if it's empty.

Type Parameters:

T - type of value

Parameters:

value - value to check for emptiness

Returns:

the provided value if non-empty

Since:

2.8

requireNonEmpty

public static <T> T requireNonEmpty(T value,
                                    String message)

Checks a value for emptiness and throws an IllegalArgumentException if it's empty.

Type Parameters:

T - type of value

Parameters:

value - value to check for emptiness

message - message to provide in exception

Returns:

the provided value if non-empty

Since:

2.8

valueIsAtLeast

public static int valueIsAtLeast(int value,
                                 int minValue)