| /* |
| * Copyright (C) 2009 The Guava Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.common.base; |
| |
| import com.google.common.annotations.GwtCompatible; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * Methods factored out so that they can be emulated differently in GWT. |
| * |
| * @author Jesse Wilson |
| */ |
| @GwtCompatible(emulated = true) |
| final class Platform { |
| private Platform() {} |
| |
| /** Calls {@link System#nanoTime()}. */ |
| static long systemNanoTime() { |
| return System.nanoTime(); |
| } |
| |
| static CharMatcher precomputeCharMatcher(CharMatcher matcher) { |
| return matcher.precomputedInternal(); |
| } |
| |
| static <T extends Enum<T>> Optional<T> getEnumIfPresent(Class<T> enumClass, String value) { |
| WeakReference<? extends Enum<?>> ref = Enums.getEnumConstants(enumClass).get(value); |
| return ref == null |
| ? Optional.<T>absent() |
| : Optional.of(enumClass.cast(ref.get())); |
| } |
| } |