Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import android.text.format.Time;

import java.util.Locale;

public class Main {
    /***
     * Fetch the estimate travel time to the indicated target
     * @param distance - how far to the target
     * @param speed - how fast we are moving
     * @param calculated - already calculated value
     * @param calc - or should I calculate?
     * @return String - "HH:MM" or "MM.SS" time to the target
     */
    public static String calculateEte(double distance, double speed, long calculated, boolean calc) {

        // If no speed, then return the empty display value
        if (0 == speed && calc) {
            return "--:--";
        }

        // Fetch the eteRaw value
        Time eteRaw = fetchRawEte(distance, speed, calculated, calc);

        // If an invalid eteRaw, then return the empty display value
        if (null == eteRaw) {
            return "--:--";
        }

        // Break the eteRaw out into hours and minutes
        int eteHr = eteRaw.hour;
        int eteMin = eteRaw.minute;
        int eteSecond = eteRaw.second;

        // Hours greater than 99 are not displayable
        if (eteHr > 99) {
            return "XX:XX";
        }

        // If hours is non zero then return HH:MM
        if (eteHr > 0) {
            // Format the hours and minutes en router
            String hr = String.format(Locale.getDefault(), "%02d", eteHr);
            String min = String.format(Locale.getDefault(), "%02d", eteMin);

            // Build the string for return
            return hr + ":" + min;
        }

        // Hours is zero, so return MM.SS
        String min = String.format(Locale.getDefault(), "%02d", eteMin);
        String sec = String.format(Locale.getDefault(), "%02d", eteSecond);

        // Build the string for return
        return min + "." + sec;

    }

    /***
     * Fetch the raw estimated time enroute given the input parameters
     * @param distance - how far to the target
     * @param speed - how fast we are moving
     * @param calculated - already calculated value
     * @param calc - or should I calculate?
     * @return int value of HR * 100 + MIN for the ete, -1 if not applicable
     */
    private static Time fetchRawEte(double distance, double speed, long calculated, boolean calc) {

        double eteTotal = calculated;
        if (calc) {
            // Calculate the travel time in seconds
            eteTotal = (distance / speed) * 3600;
        }

        // Allocate an empty time object
        Time ete = new Time();

        // Extract the hours
        ete.hour = (int) (eteTotal / 3600); // take whole int value as the hours
        eteTotal -= (ete.hour * 3600); // Remove the hours that we extracted

        // Convert what's left to fractional minutes
        ete.minute = (int) (eteTotal / 60); // Get the int value as the minutes now
        eteTotal -= (ete.minute * 60); // remove the minutes we just extracted

        // What's left is the remaining seconds 
        ete.second = Math.round((int) eteTotal); // round as appropriate

        // Account for the seconds being 60
        if (ete.second >= 60) {
            ete.minute++;
            ete.second -= 60;
        }

        // account for the minutes being 60
        if (ete.minute >= 60) {
            ete.hour++;
            ete.minute -= 60;
        }

        // Time object is good to go now
        return ete;
    }
}