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JAXX Runtime api
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package org.nuiton.jaxx.runtime.util;

/*-
 * #%L
 * JAXX :: Runtime
 * %%
 * Copyright (C) 2008 - 2017 Code Lutin, Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.text.MessageFormat;
import java.util.Locale;

/**
 * Created by tchemit on 12/07/17.
 *
 * @author Tony Chemit - [email protected]
 */
public class StringUtil {

    public static final String[] EMPTY_STRING_ARRAY = new String[0];

    static final protected double[] timeFactors = {1000000, 1000, 60, 60, 24};

    static final protected String[] timeUnites = {"ns", "ms", "s", "m", "h",
            "d"};

    /**
     * Converts an time delay into a human readable format.
     *
     * @param value the delay to convert
     * @return the memory representation of the given value
     * @see #convert(long, double[], String[])
     */
    public static String convertTime(long value) {
        return convert(value, timeFactors, timeUnites);
    }

    /**
     * Note: this method use the current locale
     * (the {@link Locale#getDefault()}) in the method
     * {@link MessageFormat#MessageFormat(String)}.
     *
     * @param value   value to convert
     * @param factors facotrs used form conversion
     * @param unites  libelle of unites to use
     * @return the converted representation of the given value
     */
    public static String convert(long value, double[] factors, String[] unites) {
        long sign = value == 0 ? 1 : value / Math.abs(value);
        int i = 0;
        double tmp = Math.abs(value);
        while (i < factors.length && i < unites.length && tmp > factors[i]) {
            tmp = tmp / factors[i++];
        }

        tmp *= sign;
        String result;
        result = MessageFormat.format("{0,number,0.###}{1}", tmp,
                                      unites[i]);
        return result;
    }
}