sk.linhard.openair.eventmodel.util.Util.java Source code

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Here is the source code for sk.linhard.openair.eventmodel.util.Util.java

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/*
 * OpenAir Event Program Model
 * Copyright (C) 2012 Michal Linhard <michal@linhard.sk>
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package sk.linhard.openair.eventmodel.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.StringTokenizer;

import org.joda.time.DateTime;
import org.joda.time.Duration;

/**
 * Utilities.
 * 
 * @author Michal Linhard <michal@linhard.sk>
 */
public class Util {
    public static final String XML_DATETIME_FORMAT = "dd-MM-yyyy HH:mm";
    public static final String XML_DATE_FORMAT = "dd-MM-yyyy";
    public static final long MILIS_IN_SEC = 1000;
    public static final long MILIS_IN_MIN = 60 * MILIS_IN_SEC;
    public static final long MILIS_IN_HOUR = 60 * MILIS_IN_MIN;

    public static DateTime dateTime(String aString) throws ParseException {
        SimpleDateFormat theFormat = new SimpleDateFormat(XML_DATETIME_FORMAT);
        theFormat.setTimeZone(Calendar.getInstance().getTimeZone());
        return new DateTime(theFormat.parse(aString));
    }

    public static DateTime date(String aString) throws ParseException {
        SimpleDateFormat theFormat = new SimpleDateFormat(XML_DATE_FORMAT);
        theFormat.setTimeZone(Calendar.getInstance().getTimeZone());
        return new DateTime(theFormat.parse(aString));
    }

    public static String[] tokenize(String aString, String aDelimiter) {
        StringTokenizer theTokenizer = new StringTokenizer(aString, aDelimiter);
        String[] theResult = new String[theTokenizer.countTokens()];
        int cnt = 0;
        while (theTokenizer.hasMoreTokens()) {
            theResult[cnt++] = theTokenizer.nextToken();
        }
        return theResult;
    }

    public static Duration duration(String aDuration) {
        String[] theTokens = tokenize(aDuration, ":");
        if (theTokens.length != 2) {
            return null;
        }
        try {
            long hours = new Long(theTokens[0]);
            long mins = new Long(theTokens[1]);
            return new Duration(hours * MILIS_IN_HOUR + mins * MILIS_IN_MIN);
        } catch (NumberFormatException theException) {
            return null;
        }
    }

    public static String formatDateTime(DateTime aDateTime) {
        if (aDateTime == null) {
            return null;
        }
        SimpleDateFormat theFormat = new SimpleDateFormat(XML_DATETIME_FORMAT);
        theFormat.setTimeZone(Calendar.getInstance().getTimeZone());
        return theFormat.format(aDateTime.toDate());
    }

    public static String formatDate(DateTime aDateTime) {
        if (aDateTime == null) {
            return null;
        }
        SimpleDateFormat theFormat = new SimpleDateFormat(XML_DATE_FORMAT);
        theFormat.setTimeZone(Calendar.getInstance().getTimeZone());
        return theFormat.format(aDateTime.toDate());
    }

    public static String formatDuration(Duration duration) {
        if (duration == null) {
            return null;
        }
        long miliseconds = duration.getMillis();
        long hours = miliseconds / MILIS_IN_HOUR;
        long mins = (miliseconds % MILIS_IN_HOUR) / MILIS_IN_MIN;
        StringBuffer theSB = new StringBuffer();
        theSB.append(hours);
        theSB.append(":");
        if (mins < 10) {
            theSB.append("0");
        }
        theSB.append(mins);
        return theSB.toString();
    }

    public static Object clone(Object anObj) throws IOException, ClassNotFoundException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream os = new ObjectOutputStream(bos);
        os.writeObject(anObj);
        os.close();
        ObjectInputStream is = new ObjectInputStream(new ByteArrayInputStream(bos.toByteArray()));
        Object ret = is.readObject();
        is.close();
        return ret;
    }
}