de.lemo.apps.application.DateWorkerImpl.java Source code

Introduction

Here is the source code for de.lemo.apps.application.DateWorkerImpl.java

Source

/**
 * File ./src/main/java/de/lemo/apps/application/DateWorkerImpl.java
 * Lemo-Application-Server for learning analytics.
 * Copyright (C) 2015
 * Leonard Kappe, Andreas Pursian, Sebastian Schwarzrock, Boris Wenzlaff
 * 
 * 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
 * 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/>.
**/

/**
 * File DateWorkerImpl.java
 * Date Feb 14, 2013
 */
package de.lemo.apps.application;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import org.apache.tapestry5.Asset;
import org.apache.tapestry5.annotations.Path;
import org.apache.tapestry5.ioc.Messages;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.json.JSONLiteral;
import org.json.JSONArray;
import org.json.JSONException;
import org.slf4j.Logger;

public class DateWorkerImpl implements DateWorker {

    @Inject
    private Logger logger;

    @Inject
    private Messages messages;

    /**
     * Defining all constants used within this class
     */
    public static final String DATE_FORMAT = "MMM dd, yyyy";
    public static final int MILLISEC_MULTIPLIER = 1000;

    @Inject
    @Path("de/lemo/apps/images/icons/glyphicons_045_calendar.png")
    private Asset calendarIcon;

    public int daysBetween(final Calendar startDate, final Calendar endDate) {
        // TODO a loop seems inefficient for this. Maybe use joda time, it has a `daysBetween` method.
        // Is the the result correct? - We get '1 day' even if the dates are only seconds apart.
        final Calendar date = (Calendar) startDate.clone();
        int daysBetween = 0;
        while (date.before(endDate)) {
            date.add(Calendar.DAY_OF_MONTH, 1);
            daysBetween++;
        }
        return daysBetween;
    }

    public int daysBetween(final Date startDate, final Date endDate) {
        // TODO see daysBetween(Calendar, Calendar)
        final Calendar startDateTemp = Calendar.getInstance();
        final Calendar endDateTemp = (Calendar) startDateTemp.clone();
        endDateTemp.setTime(endDate);
        startDateTemp.setTime(startDate);
        int daysBetween = 0;
        while (startDateTemp.before(endDateTemp)) {
            startDateTemp.add(Calendar.DAY_OF_MONTH, 1);
            daysBetween++;
        }
        return daysBetween;
    }

    /**
     * Gibt das Datum in der aktuell vom Nutzer gewaehlten Locale Einstellung aus.
     * 
     * @param inputDate
     * @return A String object in date notation
     */
    public String getLocalizedDate(final Date date, final Locale currentLocale) {
        final SimpleDateFormat dfDate = new SimpleDateFormat(DateWorkerImpl.DATE_FORMAT, currentLocale);
        return dfDate.format(date);
    }

    /**
     * Gibt das Datum und die Uhrzeit in der aktuell vom Nutzer gewaehlten Locale Einstellung aus.
     * 
     * @param the
     *            Date which should be localized, the current locale
     * @return A String object in Date + Time notation
     */
    public String getLocalizedDateTime(final Date date, final Locale currentLocale) {
        final SimpleDateFormat dfDate = new SimpleDateFormat(DateWorkerImpl.DATE_FORMAT, currentLocale);
        return dfDate.format(date);
    }

    public JSONLiteral getDatePickerParams(final Locale locale) {
        String monthNamesShort = "";
        try {
            /*
             * Force jquery ui datepicker to use short month names of the current Java version. Datepicker uses the
             * correct
             * new ones, though on the backend it's depending on the Java version. The short name for march in german
             * changed from 'Mrz' to 'Mr' in Java 8 for example. Don't mind the 13th month, datepicker ignores it
             * anyway.
             */
            monthNamesShort = new JSONArray(new java.text.DateFormatSymbols(locale).getShortMonths()).toString();
        } catch (final JSONException e) {
            logger.error(e.getMessage());
        }
        final JSONLiteral datePickerConfig = new JSONLiteral("{" + "  nextText: 'Next Month'"
                + ", prevText: 'Previous Month'" + ", changeMonth: true" + ", changeYear: true" + ", buttonText: '"
                + this.messages.get("chooseDate") + "'" + ", maxDate: '0'" + ", buttonImage: '"
                + this.calendarIcon.toClientURL() + "'" + ", buttonImageOnly: false" + ", showButtonPanel: true"
                + ", dateFormat: '" + this.messages.get("customDateFormatDatePicker") + "'" + ", monthNamesShort: "
                + monthNamesShort + ", showOn: 'both'" + "}");
        return datePickerConfig;
    }

}