com.google.common.base.Platform.java Source code

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Here is the source code for com.google.common.base.Platform.java

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/*
 * 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 java.util.concurrent.TimeUnit;

/**
 * @author Jesse Wilson
 */
final class Platform {
    static CharMatcher precomputeCharMatcher(CharMatcher matcher) {
        // CharMatcher.precomputed() produces CharMatchers that are maybe a little
        // faster (and that's debatable), but definitely more memory-hungry. We're
        // choosing to turn .precomputed() into a no-op in GWT, because it doesn't
        // seem to be a worthwhile tradeoff in a browser.
        return matcher;
    }

    static long systemNanoTime() {
        // System.nanoTime() is not available in GWT, so we get milliseconds
        // and convert to nanos.
        return TimeUnit.MILLISECONDS.toNanos(System.currentTimeMillis());
    }

    static <T extends Enum<T>> Optional<T> getEnumIfPresent(Class<T> enumClass, String value) {
        try {
            return Optional.of(Enum.valueOf(enumClass, value));
        } catch (IllegalArgumentException iae) {
            return Optional.absent();
        }
    }

    private Platform() {
    }
}