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Android example source code file (RecurrenceSet.java)

This example Android source code file (RecurrenceSet.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, dtstart, duration, eventrecurrence, exdate, exrule, pattern, provider, rdate, recurrenceset, rrule, string, stringbuilder, text, time, tzid, util, utilities, utils, value

The RecurrenceSet.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed 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 android.pim;

import android.content.ContentValues;
import android.database.Cursor;
import android.provider.Calendar;
import android.text.TextUtils;
import android.text.format.Time;
import android.util.Config;
import android.util.Log;

import java.util.List;
import java.util.regex.Pattern;

/**
 * Basic information about a recurrence, following RFC 2445 Section 4.8.5.
 * Contains the RRULEs, RDATE, EXRULEs, and EXDATE properties.
 */
public class RecurrenceSet {

    private final static String TAG = "CalendarProvider";

    private final static String RULE_SEPARATOR = "\n";
    private final static String FOLDING_SEPARATOR = "\n ";

    // TODO: make these final?
    public EventRecurrence[] rrules = null;
    public long[] rdates = null;
    public EventRecurrence[] exrules = null;
    public long[] exdates = null;

    /**
     * Creates a new RecurrenceSet from information stored in the
     * events table in the CalendarProvider.
     * @param values The values retrieved from the Events table.
     */
    public RecurrenceSet(ContentValues values)
            throws EventRecurrence.InvalidFormatException {
        String rruleStr = values.getAsString(Calendar.Events.RRULE);
        String rdateStr = values.getAsString(Calendar.Events.RDATE);
        String exruleStr = values.getAsString(Calendar.Events.EXRULE);
        String exdateStr = values.getAsString(Calendar.Events.EXDATE);
        init(rruleStr, rdateStr, exruleStr, exdateStr);
    }

    /**
     * Creates a new RecurrenceSet from information stored in a database
     * {@link Cursor} pointing to the events table in the
     * CalendarProvider.  The cursor must contain the RRULE, RDATE, EXRULE,
     * and EXDATE columns.
     *
     * @param cursor The cursor containing the RRULE, RDATE, EXRULE, and EXDATE
     * columns.
     */
    public RecurrenceSet(Cursor cursor)
            throws EventRecurrence.InvalidFormatException {
        int rruleColumn = cursor.getColumnIndex(Calendar.Events.RRULE);
        int rdateColumn = cursor.getColumnIndex(Calendar.Events.RDATE);
        int exruleColumn = cursor.getColumnIndex(Calendar.Events.EXRULE);
        int exdateColumn = cursor.getColumnIndex(Calendar.Events.EXDATE);
        String rruleStr = cursor.getString(rruleColumn);
        String rdateStr = cursor.getString(rdateColumn);
        String exruleStr = cursor.getString(exruleColumn);
        String exdateStr = cursor.getString(exdateColumn);
        init(rruleStr, rdateStr, exruleStr, exdateStr);
    }

    public RecurrenceSet(String rruleStr, String rdateStr,
                  String exruleStr, String exdateStr)
            throws EventRecurrence.InvalidFormatException {
        init(rruleStr, rdateStr, exruleStr, exdateStr);
    }

    private void init(String rruleStr, String rdateStr,
                      String exruleStr, String exdateStr)
            throws EventRecurrence.InvalidFormatException {
        if (!TextUtils.isEmpty(rruleStr) || !TextUtils.isEmpty(rdateStr)) {

            if (!TextUtils.isEmpty(rruleStr)) {
                String[] rruleStrs = rruleStr.split(RULE_SEPARATOR);
                rrules = new EventRecurrence[rruleStrs.length];
                for (int i = 0; i < rruleStrs.length; ++i) {
                    EventRecurrence rrule = new EventRecurrence();
                    rrule.parse(rruleStrs[i]);
                    rrules[i] = rrule;
                }
            }

            if (!TextUtils.isEmpty(rdateStr)) {
                rdates = parseRecurrenceDates(rdateStr);
            }

            if (!TextUtils.isEmpty(exruleStr)) {
                String[] exruleStrs = exruleStr.split(RULE_SEPARATOR);
                exrules = new EventRecurrence[exruleStrs.length];
                for (int i = 0; i < exruleStrs.length; ++i) {
                    EventRecurrence exrule = new EventRecurrence();
                    exrule.parse(exruleStr);
                    exrules[i] = exrule;
                }
            }

            if (!TextUtils.isEmpty(exdateStr)) {
                exdates = parseRecurrenceDates(exdateStr);
            }
        }
    }

    /**
     * Returns whether or not a recurrence is defined in this RecurrenceSet.
     * @return Whether or not a recurrence is defined in this RecurrenceSet.
     */
    public boolean hasRecurrence() {
        return (rrules != null || rdates != null);
    }

    /**
     * Parses the provided RDATE or EXDATE string into an array of longs
     * representing each date/time in the recurrence.
     * @param recurrence The recurrence to be parsed.
     * @return The list of date/times.
     */
    public static long[] parseRecurrenceDates(String recurrence) {
        // TODO: use "local" time as the default.  will need to handle times
        // that end in "z" (UTC time) explicitly at that point.
        String tz = Time.TIMEZONE_UTC;
        int tzidx = recurrence.indexOf(";");
        if (tzidx != -1) {
            tz = recurrence.substring(0, tzidx);
            recurrence = recurrence.substring(tzidx + 1);
        }
        Time time = new Time(tz);
        String[] rawDates = recurrence.split(",");
        int n = rawDates.length;
        long[] dates = new long[n];
        for (int i = 0; i<n; ++i) {
            // The timezone is updated to UTC if the time string specified 'Z'.
            time.parse(rawDates[i]);
            dates[i] = time.toMillis(false /* use isDst */);
            time.timezone = tz;
        }
        return dates;
    }

    /**
     * Populates the database map of values with the appropriate RRULE, RDATE,
     * EXRULE, and EXDATE values extracted from the parsed iCalendar component.
     * @param component The iCalendar component containing the desired
     * recurrence specification.
     * @param values The db values that should be updated.
     * @return true if the component contained the necessary information
     * to specify a recurrence.  The required fields are DTSTART,
     * one of DTEND/DURATION, and one of RRULE/RDATE.  Returns false if
     * there was an error, including if the date is out of range.
     */
    public static boolean populateContentValues(ICalendar.Component component,
            ContentValues values) {
        ICalendar.Property dtstartProperty =
                component.getFirstProperty("DTSTART");
        String dtstart = dtstartProperty.getValue();
        ICalendar.Parameter tzidParam =
                dtstartProperty.getFirstParameter("TZID");
        // NOTE: the timezone may be null, if this is a floating time.
        String tzid = tzidParam == null ? null : tzidParam.value;
        Time start = new Time(tzidParam == null ? Time.TIMEZONE_UTC : tzid);
        boolean inUtc = start.parse(dtstart);
        boolean allDay = start.allDay;

        if (inUtc) {
            tzid = Time.TIMEZONE_UTC;
        }
                
        String duration = computeDuration(start, component);
        String rrule = flattenProperties(component, "RRULE");
        String rdate = extractDates(component.getFirstProperty("RDATE"));
        String exrule = flattenProperties(component, "EXRULE");
        String exdate = extractDates(component.getFirstProperty("EXDATE"));

        if ((TextUtils.isEmpty(dtstart))||
                (TextUtils.isEmpty(duration))||
                ((TextUtils.isEmpty(rrule))&&
                        (TextUtils.isEmpty(rdate)))) {
                if (Config.LOGD) {
                    Log.d(TAG, "Recurrence missing DTSTART, DTEND/DURATION, "
                                + "or RRULE/RDATE: "
                                + component.toString());
                }
                return false;
        }
        
        if (allDay) {
        	// TODO: also change tzid to be UTC?  that would be consistent, but
        	// that would not reflect the original timezone value back to the
        	// server.
        	start.timezone = Time.TIMEZONE_UTC;
        }
        long millis = start.toMillis(false /* use isDst */);
        values.put(Calendar.Events.DTSTART, millis);
        if (millis == -1) {
            if (Config.LOGD) {
                Log.d(TAG, "DTSTART is out of range: " + component.toString());
            }
            return false;
        }
        
        values.put(Calendar.Events.RRULE, rrule);
        values.put(Calendar.Events.RDATE, rdate);
        values.put(Calendar.Events.EXRULE, exrule);
        values.put(Calendar.Events.EXDATE, exdate);
        values.put(Calendar.Events.EVENT_TIMEZONE, tzid);
        values.put(Calendar.Events.DURATION, duration);
        values.put(Calendar.Events.ALL_DAY, allDay ? 1 : 0);
        return true;
    }

    // This can be removed when the old CalendarSyncAdapter is removed.
    public static boolean populateComponent(Cursor cursor,
                                            ICalendar.Component component) {
        
        int dtstartColumn = cursor.getColumnIndex(Calendar.Events.DTSTART);
        int durationColumn = cursor.getColumnIndex(Calendar.Events.DURATION);
        int tzidColumn = cursor.getColumnIndex(Calendar.Events.EVENT_TIMEZONE);
        int rruleColumn = cursor.getColumnIndex(Calendar.Events.RRULE);
        int rdateColumn = cursor.getColumnIndex(Calendar.Events.RDATE);
        int exruleColumn = cursor.getColumnIndex(Calendar.Events.EXRULE);
        int exdateColumn = cursor.getColumnIndex(Calendar.Events.EXDATE);
        int allDayColumn = cursor.getColumnIndex(Calendar.Events.ALL_DAY);


        long dtstart = -1;
        if (!cursor.isNull(dtstartColumn)) {
            dtstart = cursor.getLong(dtstartColumn);
        }
        String duration = cursor.getString(durationColumn);
        String tzid = cursor.getString(tzidColumn);
        String rruleStr = cursor.getString(rruleColumn);
        String rdateStr = cursor.getString(rdateColumn);
        String exruleStr = cursor.getString(exruleColumn);
        String exdateStr = cursor.getString(exdateColumn);
        boolean allDay = cursor.getInt(allDayColumn) == 1;

        if ((dtstart == -1) ||
            (TextUtils.isEmpty(duration))||
            ((TextUtils.isEmpty(rruleStr))&&
                (TextUtils.isEmpty(rdateStr)))) {
                // no recurrence.
                return false;
        }

        ICalendar.Property dtstartProp = new ICalendar.Property("DTSTART");
        Time dtstartTime = null;
        if (!TextUtils.isEmpty(tzid)) {
            if (!allDay) {
                dtstartProp.addParameter(new ICalendar.Parameter("TZID", tzid));
            }
            dtstartTime = new Time(tzid);
        } else {
            // use the "floating" timezone
            dtstartTime = new Time(Time.TIMEZONE_UTC);
        }
        
        dtstartTime.set(dtstart);
        // make sure the time is printed just as a date, if all day.
        // TODO: android.pim.Time really should take care of this for us.
        if (allDay) {
            dtstartProp.addParameter(new ICalendar.Parameter("VALUE", "DATE"));
            dtstartTime.allDay = true;
            dtstartTime.hour = 0;
            dtstartTime.minute = 0;
            dtstartTime.second = 0;
        }

        dtstartProp.setValue(dtstartTime.format2445());
        component.addProperty(dtstartProp);
        ICalendar.Property durationProp = new ICalendar.Property("DURATION");
        durationProp.setValue(duration);
        component.addProperty(durationProp);

        addPropertiesForRuleStr(component, "RRULE", rruleStr);
        addPropertyForDateStr(component, "RDATE", rdateStr);
        addPropertiesForRuleStr(component, "EXRULE", exruleStr);
        addPropertyForDateStr(component, "EXDATE", exdateStr);
        return true;
    }

public static boolean populateComponent(ContentValues values,
                                            ICalendar.Component component) {
        long dtstart = -1;
        if (values.containsKey(Calendar.Events.DTSTART)) {
            dtstart = values.getAsLong(Calendar.Events.DTSTART);
        }
        String duration = values.getAsString(Calendar.Events.DURATION);
        String tzid = values.getAsString(Calendar.Events.EVENT_TIMEZONE);
        String rruleStr = values.getAsString(Calendar.Events.RRULE);
        String rdateStr = values.getAsString(Calendar.Events.RDATE);
        String exruleStr = values.getAsString(Calendar.Events.EXRULE);
        String exdateStr = values.getAsString(Calendar.Events.EXDATE);
        Integer allDayInteger = values.getAsInteger(Calendar.Events.ALL_DAY);
        boolean allDay = (null != allDayInteger) ? (allDayInteger == 1) : false;

        if ((dtstart == -1) ||
            (TextUtils.isEmpty(duration))||
            ((TextUtils.isEmpty(rruleStr))&&
                (TextUtils.isEmpty(rdateStr)))) {
                // no recurrence.
                return false;
        }

        ICalendar.Property dtstartProp = new ICalendar.Property("DTSTART");
        Time dtstartTime = null;
        if (!TextUtils.isEmpty(tzid)) {
            if (!allDay) {
                dtstartProp.addParameter(new ICalendar.Parameter("TZID", tzid));
            }
            dtstartTime = new Time(tzid);
        } else {
            // use the "floating" timezone
            dtstartTime = new Time(Time.TIMEZONE_UTC);
        }

        dtstartTime.set(dtstart);
        // make sure the time is printed just as a date, if all day.
        // TODO: android.pim.Time really should take care of this for us.
        if (allDay) {
            dtstartProp.addParameter(new ICalendar.Parameter("VALUE", "DATE"));
            dtstartTime.allDay = true;
            dtstartTime.hour = 0;
            dtstartTime.minute = 0;
            dtstartTime.second = 0;
        }

        dtstartProp.setValue(dtstartTime.format2445());
        component.addProperty(dtstartProp);
        ICalendar.Property durationProp = new ICalendar.Property("DURATION");
        durationProp.setValue(duration);
        component.addProperty(durationProp);

        addPropertiesForRuleStr(component, "RRULE", rruleStr);
        addPropertyForDateStr(component, "RDATE", rdateStr);
        addPropertiesForRuleStr(component, "EXRULE", exruleStr);
        addPropertyForDateStr(component, "EXDATE", exdateStr);
        return true;
    }

    private static void addPropertiesForRuleStr(ICalendar.Component component,
                                                String propertyName,
                                                String ruleStr) {
        if (TextUtils.isEmpty(ruleStr)) {
            return;
        }
        String[] rrules = getRuleStrings(ruleStr);
        for (String rrule : rrules) {
            ICalendar.Property prop = new ICalendar.Property(propertyName);
            prop.setValue(rrule);
            component.addProperty(prop);
        }
    }

    private static String[] getRuleStrings(String ruleStr) {
        if (null == ruleStr) {
            return new String[0];
        }
        String unfoldedRuleStr = unfold(ruleStr);
        String[] split = unfoldedRuleStr.split(RULE_SEPARATOR);
        int count = split.length;
        for (int n = 0; n < count; n++) {
            split[n] = fold(split[n]);
        }
        return split;
    }


    private static final Pattern IGNORABLE_ICAL_WHITESPACE_RE =
            Pattern.compile("(?:\\r\\n?|\\n)[ \t]");

    private static final Pattern FOLD_RE = Pattern.compile(".{75}");

    /**
    * fold and unfolds ical content lines as per RFC 2445 section 4.1.
    *
    * <h3>4.1 Content Lines
    *
    * <p>The iCalendar object is organized into individual lines of text, called
    * content lines. Content lines are delimited by a line break, which is a CRLF
    * sequence (US-ASCII decimal 13, followed by US-ASCII decimal 10).
    *
    * <p>Lines of text SHOULD NOT be longer than 75 octets, excluding the line
    * break. Long content lines SHOULD be split into a multiple line
    * representations using a line "folding" technique. That is, a long line can
    * be split between any two characters by inserting a CRLF immediately
    * followed by a single linear white space character (i.e., SPACE, US-ASCII
    * decimal 32 or HTAB, US-ASCII decimal 9). Any sequence of CRLF followed
    * immediately by a single linear white space character is ignored (i.e.,
    * removed) when processing the content type.
    */
    public static String fold(String unfoldedIcalContent) {
        return FOLD_RE.matcher(unfoldedIcalContent).replaceAll("$0\r\n ");
    }

    public static String unfold(String foldedIcalContent) {
        return IGNORABLE_ICAL_WHITESPACE_RE.matcher(
            foldedIcalContent).replaceAll("");
    }

    private static void addPropertyForDateStr(ICalendar.Component component,
                                              String propertyName,
                                              String dateStr) {
        if (TextUtils.isEmpty(dateStr)) {
            return;
        }

        ICalendar.Property prop = new ICalendar.Property(propertyName);
        String tz = null;
        int tzidx = dateStr.indexOf(";");
        if (tzidx != -1) {
            tz = dateStr.substring(0, tzidx);
            dateStr = dateStr.substring(tzidx + 1);
        }
        if (!TextUtils.isEmpty(tz)) {
            prop.addParameter(new ICalendar.Parameter("TZID", tz));
        }
        prop.setValue(dateStr);
        component.addProperty(prop);
    }
    
    private static String computeDuration(Time start,
                                          ICalendar.Component component) {
        // see if a duration is defined
        ICalendar.Property durationProperty =
                component.getFirstProperty("DURATION");
        if (durationProperty != null) {
            // just return the duration
            return durationProperty.getValue();
        }

        // must compute a duration from the DTEND
        ICalendar.Property dtendProperty =
                component.getFirstProperty("DTEND");
        if (dtendProperty == null) {
            // no DURATION, no DTEND: 0 second duration
            return "+P0S";
        }
        ICalendar.Parameter endTzidParameter =
                dtendProperty.getFirstParameter("TZID");
        String endTzid = (endTzidParameter == null)
                ? start.timezone : endTzidParameter.value;

        Time end = new Time(endTzid);
        end.parse(dtendProperty.getValue());
        long durationMillis = end.toMillis(false /* use isDst */)
                - start.toMillis(false /* use isDst */);
        long durationSeconds = (durationMillis / 1000);
        if (start.allDay && (durationSeconds % 86400) == 0) {
            return "P" + (durationSeconds / 86400) + "D"; // Server wants this instead of P86400S
        } else {
            return "P" + durationSeconds + "S";
        }
    }

    private static String flattenProperties(ICalendar.Component component,
                                            String name) {
        List<ICalendar.Property> properties = component.getProperties(name);
        if (properties == null || properties.isEmpty()) {
            return null;
        }

        if (properties.size() == 1) {
            return properties.get(0).getValue();
        }

        StringBuilder sb = new StringBuilder();

        boolean first = true;
        for (ICalendar.Property property : component.getProperties(name)) {
            if (first) {
                first = false;
            } else {
                // TODO: use commas.  our RECUR parsing should handle that
                // anyway.
                sb.append(RULE_SEPARATOR);
            }
            sb.append(property.getValue());
        }
        return sb.toString();
    }

    private static String extractDates(ICalendar.Property recurrence) {
        if (recurrence == null) {
            return null;
        }
        ICalendar.Parameter tzidParam =
                recurrence.getFirstParameter("TZID");
        if (tzidParam != null) {
            return tzidParam.value + ";" + recurrence.getValue();
        }
        return recurrence.getValue();
    }
}

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