Converter.java

package de.danoeh.antennapodsp.util;

import android.util.Log;

/**
 * Provides methods for converting various units.
 */
public final class Converter {
    /**
     * Class shall not be instantiated.
     */
    private Converter() {
    }

    /**
     * Logging tag.
     */
    private static final String TAG = "Converter";


    /**
     * Indicates that the value is in the Byte range.
     */
    private static final int B_RANGE = 0;
    /**
     * Indicates that the value is in the Kilobyte range.
     */
    private static final int KB_RANGE = 1;
    /**
     * Indicates that the value is in the Megabyte range.
     */
    private static final int MB_RANGE = 2;
    /**
     * Indicates that the value is in the Gigabyte range.
     */
    private static final int GB_RANGE = 3;
    /**
     * Determines the length of the number for best readability.
     */
    private static final int NUM_LENGTH = 1000;


    private static final int HOURS_MIL = 3600000;
    private static final int MINUTES_MIL = 60000;
    private static final int SECONDS_MIL = 1000;

    /**
     * Takes a byte-value and converts it into a more readable
     * String.
     *
     * @param input The value to convert
     * @return The converted String with a unit
     */
    public static String byteToString(final long input) {
        int i = 0;
        int result = 0;

        for (i = 0; i < GB_RANGE + 1; i++) {
            result = (int) (input / Math.pow(1024, i));
            if (result < NUM_LENGTH) {
                break;
            }
        }

        switch (i) {
            case B_RANGE:
                return result + " B";
            case KB_RANGE:
                return result + " KB";
            case MB_RANGE:
                return result + " MB";
            case GB_RANGE:
                return result + " GB";
            default:
                Log.e(TAG, "Error happened in byteToString");
                return "ERROR";
        }
    }

    /**
     * Converts milliseconds to a string containing hours, minutes and seconds
     */
    public static String getDurationStringLong(int duration) {
        int h = duration / HOURS_MIL;
        int rest = duration - h * HOURS_MIL;
        int m = rest / MINUTES_MIL;
        rest -= m * MINUTES_MIL;
        int s = rest / SECONDS_MIL;

        return String.format("%02d:%02d:%02d", h, m, s);
    }

    /**
     * Converts milliseconds to a string containing hours and minutes
     */
    public static String getDurationStringShort(int duration) {
        int h = duration / HOURS_MIL;
        int rest = duration - h * HOURS_MIL;
        int m = rest / MINUTES_MIL;

        return String.format("%02d:%02d", h, m);
    }

}