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