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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.implcore.internal;
import io.opencensus.common.Clock;
import io.opencensus.common.Timestamp;
import javax.annotation.concurrent.Immutable;
/**
* This class provides a mechanism for converting {@link System#nanoTime() nanoTime} values to
* {@link Timestamp}.
*/
@Immutable
public final class TimestampConverter {
private final Timestamp timestamp;
private final long nanoTime;
// Returns a WallTimeConverter initialized to now.
public static TimestampConverter now(Clock clock) {
return new TimestampConverter(clock.now(), clock.nowNanos());
}
/**
* Converts a {@link System#nanoTime() nanoTime} value to {@link Timestamp}.
*
* @param nanoTime value to convert.
* @return the {@code Timestamp} representation of the {@code time}.
*/
public Timestamp convertNanoTime(long nanoTime) {
return timestamp.addNanos(nanoTime - this.nanoTime);
}
private TimestampConverter(Timestamp timestamp, long nanoTime) {
this.timestamp = timestamp;
this.nanoTime = nanoTime;
}
}
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