org.unitime.timetable.server.ServerTimeZoneBackend.java Source code

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Here is the source code for org.unitime.timetable.server.ServerTimeZoneBackend.java

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/*
 * UniTime 3.4 - 3.5 (University Timetabling Application)
 * Copyright (C) 2012 - 2013, UniTime LLC, and individual contributors
 * as indicated by the @authors tag.
 * 
 * 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/>.
 * 
*/
package org.unitime.timetable.server;

import java.util.Date;

import org.joda.time.DateTimeZone;
import org.unitime.timetable.gwt.client.widgets.ServerDateTimeFormat.ServerTimeZoneRequest;
import org.unitime.timetable.gwt.client.widgets.ServerDateTimeFormat.ServerTimeZoneResponse;
import org.unitime.timetable.gwt.command.server.GwtRpcImplementation;
import org.unitime.timetable.gwt.command.server.GwtRpcImplements;
import org.unitime.timetable.model.Session;
import org.unitime.timetable.model.dao.SessionDAO;
import org.unitime.timetable.security.SessionContext;

/**
 * @author Tomas Muller
 */
@GwtRpcImplements(ServerTimeZoneRequest.class)
public class ServerTimeZoneBackend implements GwtRpcImplementation<ServerTimeZoneRequest, ServerTimeZoneResponse> {

    @Override
    public ServerTimeZoneResponse execute(ServerTimeZoneRequest request, SessionContext context) {
        Date first = null, last = null;
        for (Session session : SessionDAO.getInstance().findAll()) {
            if (first == null || first.after(session.getEventBeginDate()))
                first = session.getEventBeginDate();
            if (last == null || last.before(session.getEventEndDate()))
                last = session.getEventEndDate();
        }
        DateTimeZone zone = DateTimeZone.getDefault();
        int offsetInMinutes = zone.getOffset(first.getTime()) / 60000;
        ServerTimeZoneResponse ret = new ServerTimeZoneResponse();
        ret.setId(zone.getID());
        ret.addName(zone.getName(new Date().getTime()));
        ret.setTimeZoneOffsetInMinutes(offsetInMinutes);
        long time = first.getTime();
        long transition;
        while (time != (transition = zone.nextTransition(time)) && time < last.getTime()) {
            int adjustment = (zone.getOffset(transition) / 60000) - offsetInMinutes;
            ret.addTransition((int) (transition / 3600000), adjustment);
            time = transition;
        }
        return ret;
    }

}