1 /* 2 * Copyright (C) 2008 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect.testing; 18 19 import java.lang.reflect.Method; 20 21 /** 22 * Methods factored out so that they can be emulated differently in GWT. 23 * 24 * <p>This class is emulated in GWT. 25 * 26 * @author Hayward Chan 27 */ 28 class Platform { 29 30 /** 31 * Calls {@link Class#isInstance(Object)}. Factored out so that it can be 32 * emulated in GWT. 33 * 34 * <p>This method always returns {@code true} in GWT. 35 */ checkIsInstance(Class<?> clazz, Object obj)36 static boolean checkIsInstance(Class<?> clazz, Object obj) { 37 return clazz.isInstance(obj); 38 } 39 clone(T[] array)40 static <T> T[] clone(T[] array) { 41 return array.clone(); 42 } 43 44 // Class.cast is not supported in GWT. This method is a no-op in GWT. checkCast(Class<?> clazz, Object obj)45 static void checkCast(Class<?> clazz, Object obj) { 46 clazz.cast(obj); 47 } 48 format(String template, Object... args)49 static String format(String template, Object... args) { 50 return String.format(template, args); 51 } 52 53 /** 54 * Wrapper around {@link System#arraycopy} so that it can be emulated 55 * correctly in GWT. 56 * 57 * <p>It is only intended for the case {@code src} and {@code dest} are 58 * different. It also doesn't validate the types and indices. 59 * 60 * <p>As of GWT 2.0, The built-in {@link System#arraycopy} doesn't work 61 * in general case. See 62 * http://code.google.com/p/google-web-toolkit/issues/detail?id=3621 63 * for more details. 64 */ unsafeArrayCopy( Object[] src, int srcPos, Object[] dest, int destPos, int length)65 static void unsafeArrayCopy( 66 Object[] src, int srcPos, Object[] dest, int destPos, int length) { 67 System.arraycopy(src, srcPos, dest, destPos, length); 68 } 69 getMethod(Class<?> clazz, String name)70 static Method getMethod(Class<?> clazz, String name) { 71 try { 72 return clazz.getMethod(name); 73 } catch (Exception e) { 74 throw new IllegalArgumentException(e); 75 } 76 } 77 classGetSimpleName(Class<?> clazz)78 static String classGetSimpleName(Class<?> clazz) { 79 return clazz.getSimpleName(); 80 } 81 Platform()82 private Platform() {} 83 } 84