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Java classes for temporal testing and concurrency

There is a newer version: 1.1

/*
 * Copyright (c) 2009-2010, 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 java.util.Date;

import static com.google.code.tempusfugit.temporal.Duration.millis;

public final class StopWatch {

    private DateFactory dateFactory;

    private Date startDate;
    private Date lastMarkDate;

    public static StopWatch start(DateFactory dateFactory) {
        return new StopWatch(dateFactory);
    }

    private StopWatch(DateFactory dateFactory) {
        this.dateFactory = dateFactory;
        this.startDate = dateFactory.create();
    }

    public Date getStartDate() {
        return startDate;
    }

    public Duration markAndGetTotalElapsedTime() {
        lastMarkDate = dateFactory.create();
        return getTotalElapsedTime();
    }

    private Duration getTotalElapsedTime() {
        final long startTime = startDate.getTime();
        final long lastMarkTime = lastMarkDate.getTime();
        assert(lastMarkTime >= startTime);
        return millis(lastMarkTime - startTime);
    }

}