Java tutorial
/* * Copyright (C) 2012 McEvoy Software Ltd * * 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.spliffy.server.apps.calendar; import org.spliffy.server.db.utils.SessionManager; import java.io.*; import java.util.ArrayList; import java.util.Date; import java.util.zip.Adler32; import java.util.zip.CheckedOutputStream; import java.util.zip.Checksum; import net.fortuna.ical4j.data.CalendarBuilder; import net.fortuna.ical4j.data.CalendarOutputter; import net.fortuna.ical4j.data.ParserException; import net.fortuna.ical4j.model.*; import net.fortuna.ical4j.model.component.VEvent; import net.fortuna.ical4j.model.component.VTimeZone; import net.fortuna.ical4j.model.parameter.TzId; import net.fortuna.ical4j.model.property.ProdId; import net.fortuna.ical4j.model.property.Uid; import net.fortuna.ical4j.model.property.Version; import org.apache.commons.io.output.NullOutputStream; import org.hibernate.Session; import org.hibernate.Transaction; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.spliffy.common.HashUtils; import org.spliffy.server.db.*; import org.spliffy.server.db.Calendar; /** * * @author brad */ public class CalendarManager { private static final Logger log = LoggerFactory.getLogger(CalendarManager.class); private String defaultColor = "blue"; public Calendar createCalendar(BaseEntity owner, String newName) { Session session = SessionManager.session(); Transaction tx = session.beginTransaction(); Calendar c = new Calendar(); c.setColor(defaultColor); c.setCreatedDate(new Date()); c.setModifiedDate(new Date()); c.setName(newName); c.setOwner(owner); session.save(c); tx.commit(); return c; } public void delete(CalEvent event) { Session session = SessionManager.session(); Transaction tx = session.beginTransaction(); session.delete(event); tx.commit(); } public void move(CalEvent event, Calendar destCalendar, String name) { Session session = SessionManager.session(); Transaction tx = session.beginTransaction(); if (!name.equals(event.getName())) { event.setName(name); } Calendar sourceCal = event.getCalendar(); if (destCalendar != sourceCal) { sourceCal.getEvents().remove(event); event.setCalendar(destCalendar); if (destCalendar.getEvents() == null) { destCalendar.setEvents(new ArrayList<CalEvent>()); } destCalendar.getEvents().add(event); updateCtag(sourceCal); updateCtag(destCalendar); session.save(sourceCal); session.save(destCalendar); } tx.commit(); } public void copy(CalEvent event, Calendar destCalendar, String name) { Session session = SessionManager.session(); Transaction tx = session.beginTransaction(); if (destCalendar.getEvents() == null) { destCalendar.setEvents(new ArrayList<CalEvent>()); } CalEvent newEvent = new CalEvent(); newEvent.setCalendar(destCalendar); destCalendar.getEvents().add(newEvent); newEvent.setCreatedDate(new Date()); newEvent.setDescription(event.getDescription()); newEvent.setEndDate(event.getEndDate()); newEvent.setModifiedDate(new Date()); newEvent.setName(name); newEvent.setStartDate(event.getStartDate()); newEvent.setSummary(event.getSummary()); newEvent.setTimezone(event.getTimezone()); updateCtag(newEvent); session.save(newEvent); tx.commit(); } public void delete(Calendar calendar) { Session session = SessionManager.session(); Transaction tx = session.beginTransaction(); session.delete(calendar); tx.commit(); } public CalEvent createEvent(Calendar calendar, String newName, String icalData, String contentType) throws UnsupportedEncodingException { Session session = SessionManager.session(); Transaction tx = session.beginTransaction(); CalEvent e = new CalEvent(); e.setName(newName); e.setCalendar(calendar); e.setCreatedDate(new Date()); e.setModifiedDate(new Date()); ByteArrayInputStream fin = new ByteArrayInputStream(icalData.getBytes("UTF-8")); CalendarBuilder builder = new CalendarBuilder(); net.fortuna.ical4j.model.Calendar cal4jCalendar; try { cal4jCalendar = builder.build(fin); } catch (IOException | ParserException ex) { throw new RuntimeException(ex); } _setCalendar(cal4jCalendar, e); updateCtag(e); session.save(e); tx.commit(); return e; } public String getCalendar(CalEvent calEvent) { net.fortuna.ical4j.model.Calendar calendar = new net.fortuna.ical4j.model.Calendar(); calendar.getProperties().add(new ProdId("-//spliffy.org//iCal4j 1.0//EN")); calendar.getProperties().add(Version.VERSION_2_0); //calendar.getProperties().add(CalScale.GREGORIAN); TimeZoneRegistry registry = TimeZoneRegistryFactory.getInstance().createRegistry(); String sTimezone = calEvent.getTimezone(); TimeZone timezone = null; if (sTimezone != null && sTimezone.length() > 0) { timezone = registry.getTimeZone(sTimezone); // Eg Pacific/Auckland } if (timezone == null) { timezone = registry.getTimeZone("Pacific/Auckland"); log.warn("Couldnt find timezone: " + sTimezone + ", using default: " + timezone); } VTimeZone tz = timezone.getVTimeZone(); calendar.getComponents().add(tz); net.fortuna.ical4j.model.DateTime start = CalUtils.toCalDateTime(calEvent.getStartDate(), timezone); net.fortuna.ical4j.model.DateTime finish = CalUtils.toCalDateTime(calEvent.getEndDate(), timezone); String summary = calEvent.getSummary(); VEvent vevent = new VEvent(start, finish, summary); //vevent.getProperties().add(new Uid(UUID.randomUUID().toString())); vevent.getProperties().add(new Uid(calEvent.getId().toString())); vevent.getProperties().add(tz.getTimeZoneId()); TzId tzParam = new TzId(tz.getProperties().getProperty(Property.TZID).getValue()); vevent.getProperties().getProperty(Property.DTSTART).getParameters().add(tzParam); calendar.getComponents().add(vevent); CalendarOutputter outputter = new CalendarOutputter(); ByteArrayOutputStream bout = new ByteArrayOutputStream(); try { outputter.output(calendar, bout); } catch (IOException | ValidationException ex) { throw new RuntimeException(ex); } return bout.toString(); } public void setCalendar(net.fortuna.ical4j.model.Calendar calendar, CalEvent calEvent) { Session session = SessionManager.session(); Transaction tx = session.beginTransaction(); _setCalendar(calendar, calEvent); updateCtag(calEvent); session.save(calEvent); tx.commit(); } private void _setCalendar(net.fortuna.ical4j.model.Calendar calendar, CalEvent calEvent) { VEvent ev = event(calendar); calEvent.setStartDate(ev.getStartDate().getDate()); Date endDate = null; if (ev.getEndDate() != null) { endDate = ev.getEndDate().getDate(); } calEvent.setEndDate(endDate); String summary = null; if (ev.getSummary() != null) { summary = ev.getSummary().getValue(); } calEvent.setSummary(summary); } private VEvent event(net.fortuna.ical4j.model.Calendar cal) { return (VEvent) cal.getComponent("VEVENT"); } private void updateCtag(CalEvent event) { OutputStream nulOut = new NullOutputStream(); CheckedOutputStream cout = new CheckedOutputStream(nulOut, new Adler32()); HashUtils.appendLine(event.getDescription(), cout); HashUtils.appendLine(event.getSummary(), cout); HashUtils.appendLine(event.getTimezone(), cout); HashUtils.appendLine(event.getStartDate(), cout); HashUtils.appendLine(event.getEndDate(), cout); Checksum check = cout.getChecksum(); long crc = check.getValue(); event.setCtag(crc); updateCtag(event.getCalendar()); } private void updateCtag(Calendar sourceCal) { OutputStream nulOut = new NullOutputStream(); CheckedOutputStream cout = new CheckedOutputStream(nulOut, new Adler32()); HashUtils.appendLine(sourceCal.getColor(), cout); if (sourceCal.getEvents() != null) { for (CalEvent r : sourceCal.getEvents()) { String name = r.getName(); String line = HashUtils.toHashableText(name, r.getCtag(), ""); HashUtils.appendLine(line, cout); } } Checksum check = cout.getChecksum(); long crc = check.getValue(); sourceCal.setCtag(crc); } public String getDefaultColor() { return defaultColor; } public void setDefaultColor(String defaultColor) { this.defaultColor = defaultColor; } }