1 /* 2 * Copyright (C) 2009 Google Inc. 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.base; 18 19 import com.google.common.annotations.GwtCompatible; 20 21 /** 22 * Methods factored out so that they can be emulated differently in GWT. 23 * 24 * @author Jesse Wilson 25 */ 26 @GwtCompatible(emulated = true) 27 final class Platform { 28 private Platform() {} 29 30 /** 31 * Calls {@link Class#isInstance(Object)}. 32 * 33 * <p>This method is not supported in GWT yet. 34 */ 35 static boolean isInstance(Class<?> clazz, Object obj) { 36 return clazz.isInstance(obj); 37 } 38 39 /** Returns a thread-local 1024-char array. */ 40 static char[] charBufferFromThreadLocal() { 41 return DEST_TL.get(); 42 } 43 44 /** 45 * A thread-local destination buffer to keep us from creating new buffers. 46 * The starting size is 1024 characters. If we grow past this we don't 47 * put it back in the threadlocal, we just keep going and grow as needed. 48 */ 49 private static final ThreadLocal<char[]> DEST_TL = new ThreadLocal<char[]>() { 50 @Override 51 protected char[] initialValue() { 52 return new char[1024]; 53 } 54 }; 55 56 static CharMatcher precomputeCharMatcher(CharMatcher matcher) { 57 return matcher.precomputedInternal(); 58 } 59 } 60
