| /****************************************************************************** |
| * Copyright (c) 2019 TypeFox and others. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| ******************************************************************************/ |
| package org.eclipse.lsp4j.util; |
| |
| /** |
| * Utilities for checking method and constructor arguments. |
| */ |
| public final class Preconditions { |
| |
| private Preconditions() {} |
| |
| private static boolean nullChecks = true; |
| |
| public static void enableNullChecks(boolean enable) { |
| Preconditions.nullChecks = enable; |
| } |
| |
| public static <T> T checkNotNull(T object, String propertyName) { |
| if (nullChecks && object == null) { |
| throw new NullPointerException("Property must not be null: " + propertyName); |
| } |
| return object; |
| } |
| |
| } |