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Platform.java
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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 static jsinterop.annotations.JsPackage.GLOBAL;
import java.util.concurrent.TimeUnit;
import jsinterop.annotations.JsMethod;
import jsinterop.annotations.JsType;
import org.checkerframework.checker.nullness.qual.Nullable;
/** @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;
}
@SuppressWarnings("GoodTime") // reading system time without TimeSource
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();
}
}
static String formatCompact4Digits(double value) {
return "" + ((Number) (Object) value).toPrecision(4);
}
@JsMethod
static native boolean stringIsNullOrEmpty(@Nullable String string) /*-{
return !string;
}-*/;
@JsMethod
static native String nullToEmpty(@Nullable String string) /*-{
return string || "";
}-*/;
@JsMethod
static native String emptyToNull(@Nullable String string) /*-{
return string || null;
}-*/;
@JsType(isNative = true, name = "number", namespace = GLOBAL)
private interface Number {
double toPrecision(int precision);
}
static CommonPattern compilePattern(String pattern) {
throw new UnsupportedOperationException();
}
static boolean patternCompilerIsPcreLike() {
throw new UnsupportedOperationException();
}
private Platform() {}
}