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 <T> T	requireNonNull(T object, String message) Throws a NullPointerException if the specified parameter is null, otherwise returns the specified parameter.

Methods inherited from class java.lang.Object

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

Method Detail

requireNonNull

public static <T> T requireNonNull(T object,
                                   String message)

Throws a NullPointerException if the specified parameter is null, otherwise returns the specified parameter.

On Java 7, just use Objects.requireNonNull(T, String)

Usage:

 // earlier you would write this:
 public SomeConstructor(Object param) {
     if (param == null) {
         throw new NullPointerException("param");
     }
     this.field = param;
 }

 // now you can do the same in one line:
 public SomeConstructor(Object param) {
     this.field = Assert.requireNonNull("param");
 }
 

Type Parameters:

T - the type of the parameter to check and return

Parameters:

object - the parameter to check

message - message to populate the NPE with if necessary

Returns:

the specified parameter

Throws:

NullPointerException - if object is null