CalendarsHandler.java

/**
 * Copyright (c) 2012-2013, David Wiesner
 * 
 * This file is part of Andoid Caldav Sync Adapter Free.
 *
 * Andoid Caldav Sync Adapter Free 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.
 *
 * Andoid Caldav Sync Adapter Free 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 Andoid Caldav Sync Adapter Free.  
 * If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package org.gege.caldavsyncadapter.caldav.xml;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.gege.caldavsyncadapter.BuildConfig;
import org.gege.caldavsyncadapter.caldav.entities.DavCalendar;
import org.gege.caldavsyncadapter.caldav.entities.DavCalendar.CalendarSource;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import android.util.Log;

public class CalendarsHandler extends DefaultHandler {

	private static final String CALENDAR = "calendar";
	private static final String RESOURCETYPE = "resourcetype";
	private static final String CALENDAR_COLOR = "calendar-color";
	private static final String GETCTAG = "getctag";
	private static final String DISPLAYNAME = "displayname";
	private URI homeURI;

	public CalendarsHandler(URI homeURI) {
		this.homeURI = homeURI;
	}

	private static final String RESPONSE = "response";
	private static final String HREF = "href";

	private StringBuilder stringBuilder = new StringBuilder();
	private String currentElement;
	private DavCalendar calendar;
	public List<DavCalendar> calendars = new ArrayList<DavCalendar>();
	private boolean isInResourceType = false;
	private boolean isCalendarResource;

	public final static List<String> TAGS = Arrays.asList(HREF, RESOURCETYPE,
			DISPLAYNAME, GETCTAG, CALENDAR_COLOR);

	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		if (RESPONSE.equals(localName)) {
			calendar = new DavCalendar(CalendarSource.CalDAV);
			isCalendarResource = false;
		} else if (RESOURCETYPE.equals(localName)) {
			isInResourceType = true;
		} else if (isInResourceType && CALENDAR.equals(localName)) {
			isCalendarResource = true;
		}
		currentElement = localName;
		stringBuilder.setLength(0);
	}

	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		if (TAGS.contains(currentElement)) {
			stringBuilder.append(ch, start, length);
		}
	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		if (TAGS.contains(localName)) {
			if (calendar != null) {
				if (HREF.equals(localName)) {
					String calendarUrl = stringBuilder.toString();
					calendarUrl = calendarUrl.trim();
					try {
						URI calendarURI = new URI(calendarUrl);
						calendar.setURI(homeURI.resolve(calendarURI));
					} catch (URISyntaxException e) {
						if (BuildConfig.DEBUG) {
							Log.e(CalendarsHandler.class.getSimpleName(),
									"calendar-uri malformed: " + calendarUrl);
						} else {
							Log.e(CalendarsHandler.class.getSimpleName(),
									"uri malformed in href");
						}
					}
				} else if (DISPLAYNAME.equals(localName)) {
					calendar.setCalendarDisplayName(stringBuilder.toString());
				} else if (GETCTAG.equals(localName)) {
					calendar.setCTag(stringBuilder.toString(), false);
				} else if (CALENDAR_COLOR.equals(localName)) {
					calendar.setCalendarColorAsString(stringBuilder.toString());
				}
			}
			//stringBuilder.setLength(0);
		} else if (RESPONSE.equals(localName)) {
			if (isCalendarResource && isValidCalendar(calendar)) {
				calendars.add(calendar);
			}
		}
		currentElement=null;
	}

	private boolean isValidCalendar(DavCalendar calendar) {
		return calendar != null && calendar.getURI() != null
				&& calendar.getcTag() != null
				&& calendar.getCalendarDisplayName() != null;
	}
}