Java Fraction Format format0(Double d)

Description

format

License

Open Source License

Declaration

public static final String format0(Double d) 

Method Source Code

//package com.java2s;
/*/* w  w  w . j  ava2  s  .  co m*/
 * Spirit, a study/biosample management tool for research.
 * Copyright (C) 2018 Idorsia Pharmaceuticals Ltd., Hegenheimermattweg 91,
 * CH-4123 Allschwil, Switzerland.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 * @author Joel Freyss
 */

import java.text.DateFormat;
import java.text.DecimalFormat;

import java.util.Calendar;
import java.util.Date;

public class Main {
    /**
     * List of datetime formatters:
     * - with seconds
     * - with hours/minutes
     * - with days
     */
    private static DateFormat[] dateTimeFormatters;
    private static final DecimalFormat df0 = new DecimalFormat("0");
    private static final DecimalFormat df3 = new DecimalFormat("0.000");

    public static final String format0(Double d) {
        if (d == null)
            return "";
        return df0.format(d);
    }

    public static final String format(Object value) {
        if (value == null) {
            return "";
        } else if (value instanceof Double) {
            return format3((Double) value);
        } else if (value instanceof Date) {
            return formatDateTime((Date) value);
        } else {
            return "" + value;
        }
    }

    public static final String format3(Double d) {
        if (d == null)
            return "";
        return df3.format(d);
    }

    public static final String formatDateTime(Date d) {
        if (d == null)
            return "";
        Calendar cal = Calendar.getInstance();
        cal.setTime(d);
        if (cal.get(Calendar.SECOND) != 0)
            return dateTimeFormatters[0].format(d);
        if (cal.get(Calendar.HOUR_OF_DAY) != 0 || cal.get(Calendar.MINUTE) != 0)
            return dateTimeFormatters[1].format(d);
        return dateTimeFormatters[2].format(d);
    }
}

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