mirror of
https://github.com/vanitasvitae/Smack.git
synced 2024-06-23 20:04:51 +02:00
818ee8a727
and not NullPointerException. Altough this differs from java.util.Objects behavior, throwing an IllegalArgumentException appears more sensible and makes it easier to catch it in Smack's parsing function.
70 lines
2.4 KiB
Java
70 lines
2.4 KiB
Java
/**
|
|
*
|
|
* Copyright 2015-2019 Florian Schmaus
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
package org.jivesoftware.smack.util;
|
|
|
|
import java.util.Collection;
|
|
|
|
public class Objects {
|
|
|
|
/**
|
|
* Checks that the specified object reference is not <code>null</code> and throws a customized
|
|
* {@link IllegalArgumentException} if it is.
|
|
* <p>
|
|
* Note that unlike <code>java.util.Objects</code>, this method throws an {@link IllegalArgumentException} instead
|
|
* of an {@link NullPointerException}.
|
|
* </p>
|
|
*
|
|
* @param <T> the type of the reference.
|
|
* @param obj the object reference to check for nullity.
|
|
* @param message detail message to be used in the event that a {@link IllegalArgumentException} is thrown.
|
|
* @return <code>obj</code> if not null.
|
|
* @throws IllegalArgumentException in case <code>obj</code> is <code>null</code>.
|
|
*/
|
|
public static <T> T requireNonNull(T obj, String message) throws IllegalArgumentException {
|
|
if (obj == null) {
|
|
if (message == null) {
|
|
message = "Can not provide null argument";
|
|
}
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
public static <T> T requireNonNull(T obj) {
|
|
return requireNonNull(obj, null);
|
|
}
|
|
|
|
/**
|
|
* Require a collection to be neither null, nor empty.
|
|
*
|
|
* @param collection collection
|
|
* @param message error message
|
|
* @param <T> Collection type
|
|
* @return collection
|
|
*/
|
|
public static <T extends Collection<?>> T requireNonNullNorEmpty(T collection, String message) {
|
|
if (requireNonNull(collection).isEmpty()) {
|
|
throw new IllegalArgumentException(message);
|
|
}
|
|
return collection;
|
|
}
|
|
|
|
public static boolean equals(Object a, Object b) {
|
|
return a == b || (a != null && a.equals(b));
|
|
}
|
|
}
|