SyncUtils.java

package io.github.memfis19.cadar.internal.utils;

import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.CalendarContract;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;

import java.util.Calendar;
import java.util.TimeZone;

import io.github.memfis19.cadar.data.entity.Event;
import io.github.memfis19.cadar.data.entity.property.EventProperties;

/**
 * Created by memfis on 3/25/15.
 */
public class SyncUtils {

    public static String getCalendarUriBase(Context context) {
        String calendarUriBase = null;
        Uri calendars = Uri.parse("content://calendar/calendars");
        Cursor cursor = null;
        try {
            cursor = context.getContentResolver().query(calendars, null, null, null, null);
        } catch (Exception e) {
            // eat
        }
        if (cursor != null) {
            calendarUriBase = "content://calendar/";
        } else {
            calendars = Uri.parse("content://com.android.calendar/calendars");
            try {
                cursor = context.getContentResolver().query(calendars, null, null, null, null);
            } catch (Exception e) {
                // eat
            }
            if (cursor != null) {
                calendarUriBase = "content://com.android.calendar/";
            }
        }
        if (cursor != null) {
            cursor.close();
        }
        return calendarUriBase;
    }

    public static boolean deleteEvent(Context context, long calendarId) {
        ContentResolver contentResolver = context.getContentResolver();
        Uri eventsUri = Uri.parse(getCalendarUriBase(context) + "events");
        return contentResolver.delete(eventsUri, CalendarContract.Events._ID + "=" + calendarId, null) == 1;
    }


    /**
     * Insert passed event to the device calendar with according start/end dates and repeat period
     *
     * @param context - activity context.
     * @param event   - event to insert.
     * @return - return created event id generated by device calendar or 0 it insert was not executed.
     * @see EventProperties.RepeatPeriod
     * use rfc2445 (iCalendar) protocol to describe event.
     */
    public static long insertEvent(Context context, Event event) {
        if (event == null) return 0;

        ContentResolver contentResolver = context.getContentResolver();
        ContentValues values = new ContentValues();

        Calendar eventCalendar = DateUtils.getCalendarInstance();
        eventCalendar.setTime(event.getEventStartDate());
        eventCalendar.set(Calendar.HOUR_OF_DAY, 23);
        eventCalendar.set(Calendar.MINUTE, 59);
        eventCalendar.set(Calendar.SECOND, 59);
        eventCalendar.set(Calendar.MILLISECOND, 999);

        values.put(CalendarContract.Events.DTSTART, event.getOriginalEventStartDate().getTime());
        values.put(CalendarContract.Events.RRULE, getRepeatRule(event));
        values.put(CalendarContract.Events.DURATION, "+P1H");
        values.put(CalendarContract.Events.TITLE, event.getEventTitle());
        values.put(CalendarContract.Events.DESCRIPTION, event.getEventDescription());
        values.put(CalendarContract.Events.CALENDAR_ID, 1);
        values.put(CalendarContract.Events.EVENT_TIMEZONE, TimeZone.getDefault().getID());


        Uri eventsUri = Uri.parse(getCalendarUriBase(context) + "events");
        Uri uri = contentResolver.insert(eventsUri, values);
        if (uri != null) {
            return Long.parseLong(uri.getLastPathSegment());
        }
        return 0;
    }

    /**
     * Update passed event if exist in the device calendar
     *
     * @param context - activity context.
     * @param event   - event to insert.
     * @return - return the number of rows updated or 0 if update was not executed.
     */
    public static int updateEvent(Context context, Event event) {
        if (event == null) return 0;

        ContentResolver contentResolver = context.getContentResolver();
        Uri eventsUri = Uri.parse(getCalendarUriBase(context) + "events");
        Uri eventUri = ContentUris.withAppendedId(eventsUri, event.getCalendarId());

        if (eventUri == null) return 0;

        ContentValues values = new ContentValues();

        Calendar eventCalendar = DateUtils.getCalendarInstance();
        eventCalendar.setTime(event.getEventStartDate());
        eventCalendar.set(Calendar.HOUR_OF_DAY, 23);
        eventCalendar.set(Calendar.MINUTE, 59);
        eventCalendar.set(Calendar.SECOND, 59);
        eventCalendar.set(Calendar.MILLISECOND, 999);

        values.put(CalendarContract.Events.DTSTART, event.getEventStartDate().getTime());
        values.put(CalendarContract.Events.RRULE, getRepeatRule(event));
        values.put(CalendarContract.Events.DURATION, "+P1H");
        values.put(CalendarContract.Events.TITLE, event.getEventTitle());
        values.put(CalendarContract.Events.DESCRIPTION, event.getEventDescription());
        values.put(CalendarContract.Events.CALENDAR_ID, 1);
        values.put(CalendarContract.Events.EVENT_TIMEZONE, TimeZone.getDefault().getID());

        return contentResolver.update(eventUri, values, null, null);
    }

    /**
     * Return rfc2445 repeat period according to the event repeat period
     *
     * @param event - event to process.
     * @return - string with according rfc2445 repeat period.
     * @see EventProperties.RepeatPeriod
     */
    public static String getRepeatRule(Event event) {
        int repeatPeriod = event.getEventRepeatPeriod();
        if (event.getEventEndDate() == null) {
            event.setEventEndDate(event.getEventStartDate());
        }

        StringBuffer result = new StringBuffer("FREQ=");
        if (EventProperties.EVERY_WEEK == repeatPeriod) {
            result.append("WEEKLY");
        } else if (EventProperties.EVERY_2_WEEK == repeatPeriod) {
            result.append("WEEKLY;INTERVAL=2");
        } else if (EventProperties.EVERY_3_WEEK == repeatPeriod) {
            result.append("WEEKLY;INTERVAL=3");
        } else if (EventProperties.EVERY_4_WEEK == repeatPeriod) {
            result.append("WEEKLY;INTERVAL=4");
        } else if (EventProperties.EVERY_MONTH == repeatPeriod) {
            result.append("MONTHLY");
        } else if (EventProperties.EVERY_YEAR == repeatPeriod) {
            result.append("YEARLY");
        } else {
            if (event.getEventEndDate() == null) event.setEventEndDate(event.getEventStartDate());
            result.append("DAILY");
        }

        if (event.getEventEndDate() != null) {
            DateTime dateTime = new DateTime(event.getEventEndDate(), DateTimeZone.UTC);
            String utcDateTime = dateTime.toString(DateTimeFormat.forPattern("yyyyMMdd'T'HHmmss'Z'"));
            result.append(";UNTIL=");
            result.append(utcDateTime);
        }

        if (EventProperties.EVERY_MONTH == repeatPeriod && DateUtils.isLastDayOfTheMonth(event.getEventStartDate())) {
            result.append(";BYMONTHDAY=-1");
        }

        return result.toString();
    }
}