/*
* Copyright (c) 2009-2014, toby weston & tempus-fugit committers
*
* 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.code.tempusfugit.temporal;
import com.google.code.tempusfugit.ClassInvariantViolation;
import com.google.code.tempusfugit.concurrency.annotations.Not;
import com.google.code.tempusfugit.concurrency.annotations.ThreadSafe;
import java.util.Date;
import static com.google.code.tempusfugit.temporal.Duration.millis;
@Not(ThreadSafe.class)
public final class Timer implements StopWatch {
private final Clock clock;
private Date started;
private Date stopped;
/**
* Constructs and starts a stop watch.
* @since 1.2
* */
public Timer(Clock clock) {
Date now = clock.now();
this.clock = clock;
this.started = now;
this.stopped = now;
}
@Deprecated
public Date getStartDate() {
return started;
}
@Override
public void reset() {
started = clock.now();
}
@Override
public void lap() {
stopped = clock.now();
}
@Override
public Duration elapsedTime() {
if (stopped.getTime() < started.getTime())
throw new ClassInvariantViolation("please start the stop watch before stopping it");
return millis(stopped.getTime() - started.getTime());
}
}