TimeTracker.java

package me.ferusgrim.utils;

import java.util.concurrent.TimeUnit;

public class TimeTracker {

    private final TimeUnit measurement;
    private final long waitTime;
    private long startTime = 0;

    public TimeTracker(TimeUnit measurement, long waitTime, boolean startTimer) {
        this.measurement = measurement;
        this.waitTime = waitTime;

        if (startTimer) {
            this.startTime = System.currentTimeMillis();
        }
    }

    public TimeTracker(TimeUnit measurement, long waitTime) {
        this(measurement, waitTime, false);
    }

    public TimeUnit getMeasurement() {
        return this.measurement;
    }

    public long getWaitTime() {
        return this.waitTime;
    }

    public long getStartTime() {
        return this.startTime;
    }

    public long getEndTime() {
        return this.startTime + this.measurement.toMillis(this.waitTime);
    }

    public TimeTracker startTimer() {
        if (this.startTime == 0) {
            throw new UnsupportedOperationException("Timer has already been started!");
        }

        this.startTime = System.currentTimeMillis();
        
        return this;
    }

    public TimeTracker resetTimer() {
        this.startTime = 0;
        
        return this;
    }

    public TimeTracker restart() {
        this.resetTimer();
        this.startTimer();
        
        return this;
    }

    public boolean hasEnoughTimePassed() {
        if (this.startTime == 0) {
            throw new UnsupportedOperationException("Timer hasn't been started, yet!");
        }

        return System.currentTimeMillis() >= this.getEndTime();
    }

    public boolean isRunning() {
        return this.startTime > 0;
    }

    public TimeTracker duplicate() {
        return new TimeTracker(this.measurement, this.waitTime);
    }
}