001package org.junit.internal; 002 003/** @since 4.13 */ 004public final class Checks { 005 006 private Checks() {} 007 008 /** 009 * Checks that the given value is not {@code null}. 010 * 011 * @param value object reference to check 012 * @return the passed-in value, if not {@code null} 013 * @throws NullPointerException if {@code value} is {@code null} 014 */ 015 public static <T> T notNull(T value) { 016 if (value == null) { 017 throw new NullPointerException(); 018 } 019 return value; 020 } 021 022 /** 023 * Checks that the given value is not {@code null}, using the given message 024 * as the exception message if an exception is thrown. 025 * 026 * @param value object reference to check 027 * @param message message to use if {@code value} is {@code null} 028 * @return the passed-in value, if not {@code null} 029 * @throws NullPointerException if {@code value} is {@code null} 030 */ 031 public static <T> T notNull(T value, String message) { 032 if (value == null) { 033 throw new NullPointerException(message); 034 } 035 return value; 036 } 037}