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/*
* Copyright 2017, OpenCensus 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 io.opencensus.common;
import java.math.BigInteger;
/** Util class for {@link Timestamp} and {@link Duration}. */
final class TimeUtils {
static final long MAX_SECONDS = 315576000000L;
static final int MAX_NANOS = 999999999;
static final long MILLIS_PER_SECOND = 1000L;
static final long NANOS_PER_MILLI = 1000 * 1000;
static final long NANOS_PER_SECOND = NANOS_PER_MILLI * MILLIS_PER_SECOND;
private TimeUtils() {}
/**
* Compares two longs. This functionality is provided by {@code Long.compare(long, long)} in Java
* 7.
*/
static int compareLongs(long x, long y) {
if (x < y) {
return -1;
} else if (x == y) {
return 0;
} else {
return 1;
}
}
private static final BigInteger MAX_LONG_VALUE = BigInteger.valueOf(Long.MAX_VALUE);
private static final BigInteger MIN_LONG_VALUE = BigInteger.valueOf(Long.MIN_VALUE);
/**
* Adds two longs and throws an {@link ArithmeticException} if the result overflows. This
* functionality is provided by {@code Math.addExact(long, long)} in Java 8.
*/
static long checkedAdd(long x, long y) {
BigInteger sum = BigInteger.valueOf(x).add(BigInteger.valueOf(y));
if (sum.compareTo(MAX_LONG_VALUE) > 0 || sum.compareTo(MIN_LONG_VALUE) < 0) {
throw new ArithmeticException("Long sum overflow: x=" + x + ", y=" + y);
}
return x + y;
}
}
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