Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package com.ettrema.httpclient.calsync.parse; import com.ettrema.httpclient.calsync.parse.annotation.*; import com.ettrema.httpclient.parse.PropertyAccessor; import java.beans.PropertyDescriptor; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.lang.annotation.Annotation; import java.lang.reflect.Method; import java.net.URISyntaxException; import java.util.Date; import java.util.HashMap; import java.util.Map; import java.util.UUID; 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.property.DateProperty; import net.fortuna.ical4j.model.property.ProdId; import net.fortuna.ical4j.model.property.Version; import org.apache.commons.beanutils.PropertyUtils; import org.apache.commons.io.IOUtils; /** * * @author brad */ public class CalDavBeanPropertyMapper { private final Map<Class, Mapper> mapOfMappers; private final PropertyAccessor propertyAccessor; public CalDavBeanPropertyMapper(PropertyAccessor propertyAccessor) { this.propertyAccessor = propertyAccessor; mapOfMappers = new HashMap<Class, Mapper>(); addMapper(Uid.class, new UidMapper()); addMapper(Location.class, new LocationMapper()); addMapper(Summary.class, new SummaryMapper()); addMapper(Description.class, new DescriptionMapper()); addMapper(EndDate.class, new EndDateMapper()); addMapper(StartDate.class, new StartDateMapper()); addMapper(Timezone.class, new TimezoneMapper()); addMapper(Organizer.class, new OrganizerMapper()); } private void addMapper(Class c, Mapper m) { mapOfMappers.put(c, m); } public void toBean(Object bean, String icalText) { ByteArrayInputStream fin = null; try { fin = new ByteArrayInputStream(icalText.getBytes("UTF-8")); CalendarBuilder builder = new CalendarBuilder(); net.fortuna.ical4j.model.Calendar cal4jCalendar; try { cal4jCalendar = builder.build(fin); } catch (IOException ex) { throw new RuntimeException(icalText, ex); } catch (ParserException ex) { throw new RuntimeException(icalText, ex); } PropertyDescriptor[] pds = PropertyUtils.getPropertyDescriptors(bean); for (PropertyDescriptor pd : pds) { if (pd.getReadMethod() != null && pd.getWriteMethod() != null) { Method read = pd.getReadMethod(); Annotation[] annotations = read.getAnnotations(); for (Annotation anno : annotations) { Mapper mapper = mapOfMappers.get(anno.annotationType()); if (mapper != null) { mapper.mapToBean(cal4jCalendar, bean, pd); } } } } } catch (UnsupportedEncodingException ex) { throw new RuntimeException(ex); } finally { IOUtils.closeQuietly(fin); } } /** * Find a property with the given annotation and return its value * * @param bean * @param annotationClass * @return */ public <T> T getProperty(Object bean, Class annotationClass, Class<T> valueClass) { PropertyDescriptor[] pds = PropertyUtils.getPropertyDescriptors(bean); for (PropertyDescriptor pd : pds) { if (pd.getReadMethod() != null && pd.getWriteMethod() != null) { Method read = pd.getReadMethod(); Annotation[] annotations = read.getAnnotations(); for (Annotation anno : annotations) { if (anno.annotationType() == annotationClass) { return propertyAccessor.get(bean, read, valueClass); } } } } return null; } public String toVCard(Object bean) { 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); VEvent vevent = new VEvent(); calendar.getComponents().add(vevent); PropertyDescriptor[] pds = PropertyUtils.getPropertyDescriptors(bean); for (PropertyDescriptor pd : pds) { if (pd.getReadMethod() != null && pd.getWriteMethod() != null) { Method read = pd.getReadMethod(); Annotation[] annotations = read.getAnnotations(); for (Annotation anno : annotations) { Mapper mapper = mapOfMappers.get(anno.annotationType()); if (mapper != null) { mapper.mapToCard(calendar, bean, pd); } } } } CalendarOutputter outputter = new CalendarOutputter(); ByteArrayOutputStream bout = new ByteArrayOutputStream(); try { outputter.output(calendar, bout); } catch (IOException ex) { throw new RuntimeException(ex); } catch (ValidationException ex) { throw new RuntimeException(ex); } return bout.toString(); } private VEvent event(net.fortuna.ical4j.model.Calendar cal) { return (VEvent) cal.getComponent("VEVENT"); } private String getPropValue(Property prop) { if (prop == null) { return null; } return prop.getValue(); } private net.fortuna.ical4j.model.Date getDateValue(DateProperty prop) { if (prop == null) { return null; } return prop.getDate(); } public abstract class Mapper { abstract void mapToBean(net.fortuna.ical4j.model.Calendar calEvent, Object bean, PropertyDescriptor pd); abstract void mapToCard(net.fortuna.ical4j.model.Calendar calEvent, Object bean, PropertyDescriptor pd); } public class UidMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); Method m = pd.getWriteMethod(); Property uidProp = vevent.getProperty("UID"); String uid = null; if (uidProp != null) { uid = uidProp.getValue(); } if (uid == null) { uid = UUID.randomUUID().toString(); } propertyAccessor.set(bean, m, uid); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { String uid = propertyAccessor.get(bean, pd.getReadMethod(), String.class); VEvent vevent = event(cal); vevent.getProperties().add(new net.fortuna.ical4j.model.property.Uid(uid)); } } public class TimezoneMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { Method m = pd.getWriteMethod(); String tzId = getPropValue(cal.getProperty(Property.TZID)); propertyAccessor.set(bean, m, tzId); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { TimeZoneRegistry registry = TimeZoneRegistryFactory.getInstance().createRegistry(); String tzId = propertyAccessor.get(bean, pd.getReadMethod(), String.class); TimeZone timezone = null; if (tzId != null && tzId.length() > 0) { timezone = registry.getTimeZone(tzId); // Eg Pacific/Auckland } // TODO: do we need to use a default time zone if none given? if (timezone != null) { VTimeZone tz = timezone.getVTimeZone(); cal.getComponents().add(tz); } } } public class LocationMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); String s = getPropValue(vevent.getLocation()); propertyAccessor.set(bean, pd.getWriteMethod(), s); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { String s = propertyAccessor.get(bean, pd.getReadMethod(), String.class); VEvent vevent = event(cal); net.fortuna.ical4j.model.property.Location d = new net.fortuna.ical4j.model.property.Location(s); vevent.getProperties().add(d); } } public class OrganizerMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); String s = getPropValue(vevent.getOrganizer()); propertyAccessor.set(bean, pd.getWriteMethod(), s); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { String s = propertyAccessor.get(bean, pd.getReadMethod(), String.class); if (s == null || s.trim().length() == 0) { return; } VEvent vevent = event(cal); net.fortuna.ical4j.model.property.Organizer d; try { d = new net.fortuna.ical4j.model.property.Organizer(s); } catch (URISyntaxException ex) { throw new RuntimeException(s, ex); } vevent.getProperties().add(d); } } public class DescriptionMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); String desc = getPropValue(vevent.getDescription()); propertyAccessor.set(bean, pd.getWriteMethod(), desc); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { String s = propertyAccessor.get(bean, pd.getReadMethod(), String.class); if (s == null && s.trim().length() == 0) { return; } VEvent vevent = event(cal); net.fortuna.ical4j.model.property.Description d = new net.fortuna.ical4j.model.property.Description(); d.setValue(s); vevent.getProperties().add(d); } } public class SummaryMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); String s = getPropValue(vevent.getSummary()); propertyAccessor.set(bean, pd.getWriteMethod(), s); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); String s = propertyAccessor.get(bean, pd.getReadMethod(), String.class); if (s == null && s.trim().length() == 0) { return; } net.fortuna.ical4j.model.property.Summary d = new net.fortuna.ical4j.model.property.Summary(s); vevent.getProperties().add(d); } } public class EndDateMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); Date dt = getDateValue(vevent.getEndDate()); propertyAccessor.set(bean, pd.getWriteMethod(), dt); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); Date d = propertyAccessor.get(bean, pd.getReadMethod(), Date.class); if (d == null) { return; } net.fortuna.ical4j.model.Date dt = new net.fortuna.ical4j.model.Date(d); net.fortuna.ical4j.model.property.DtEnd p = new net.fortuna.ical4j.model.property.DtEnd(dt); vevent.getProperties().add(p); } } public class StartDateMapper extends Mapper { @Override void mapToBean(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); Date dt = getDateValue(vevent.getStartDate()); propertyAccessor.set(bean, pd.getWriteMethod(), dt); } @Override void mapToCard(net.fortuna.ical4j.model.Calendar cal, Object bean, PropertyDescriptor pd) { VEvent vevent = event(cal); Date d = propertyAccessor.get(bean, pd.getReadMethod(), Date.class); if (d == null) { return; } net.fortuna.ical4j.model.Date dt = new net.fortuna.ical4j.model.Date(d); net.fortuna.ical4j.model.property.DtStart p = new net.fortuna.ical4j.model.property.DtStart(dt); vevent.getProperties().add(p); } } }