Caldavsync Sources: src/net/fortuna/ical4j/model/Recur.java@fb9019fb1bf7 (annotated)

src/net/fortuna/ical4j/model/Recur.java@fb9019fb1bf7 (annotated)

src/net/fortuna/ical4j/model/Recur.java

Tue, 10 Feb 2015 18:12:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 10 Feb 2015 18:12:00 +0100
changeset 0: fb9019fb1bf7
child 3: 73bdfa70b04e
permissions: -rw-r--r--

Import initial revisions of existing project AndroidCaldavSyncAdapater,
forked from upstream repository at 27e8a0f8495c92e0780d450bdf0c7cec77a03a55.

 /**
  * Copyright (c) 2012, Ben Fortuna
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  o Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
  *  o Redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
  * documentation and/or other materials provided with the distribution.
  *
  *  o Neither the name of Ben Fortuna nor the names of any other contributors
  * may be used to endorse or promote products derived from this software
  * without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 package net.fortuna.ical4j.model;
 import java.io.IOException;
 import java.io.Serializable;
 import java.text.ParseException;
 import java.util.Calendar;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.StringTokenizer;
 import net.fortuna.ical4j.model.parameter.Value;
 import net.fortuna.ical4j.util.Configurator;
 import net.fortuna.ical4j.util.Dates;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 /**
  * $Id$ [18-Apr-2004]
  *
  * Defines a recurrence.
  * @version 2.0
  * @author Ben Fortuna
  */
 public class Recur implements Serializable {
     private static final long serialVersionUID = -7333226591784095142L;
     private static final String FREQ = "FREQ";
     private static final String UNTIL = "UNTIL";
     private static final String COUNT = "COUNT";
     private static final String INTERVAL = "INTERVAL";
     private static final String BYSECOND = "BYSECOND";
     private static final String BYMINUTE = "BYMINUTE";
     private static final String BYHOUR = "BYHOUR";
     private static final String BYDAY = "BYDAY";
     private static final String BYMONTHDAY = "BYMONTHDAY";
     private static final String BYYEARDAY = "BYYEARDAY";
     private static final String BYWEEKNO = "BYWEEKNO";
     private static final String BYMONTH = "BYMONTH";
     private static final String BYSETPOS = "BYSETPOS";
     private static final String WKST = "WKST";
     /**
      * Second frequency resolution.
      */
     public static final String SECONDLY = "SECONDLY";
     /**
      * Minute frequency resolution.
      */
     public static final String MINUTELY = "MINUTELY";
     /**
      * Hour frequency resolution.
      */
     public static final String HOURLY = "HOURLY";
     /**
      * Day frequency resolution.
      */
     public static final String DAILY = "DAILY";
     /**
      * Week frequency resolution.
      */
     public static final String WEEKLY = "WEEKLY";
     /**
      * Month frequency resolution.
      */
     public static final String MONTHLY = "MONTHLY";
     /**
      * Year frequency resolution.
      */
     public static final String YEARLY = "YEARLY";
     /**
      * When calculating dates matching this recur ({@code getDates()} or {@code getNextDate}),
      *  this property defines the maximum number of attempt to find a matching date by
      * incrementing the seed.
      * <p>The default value is 1000. A value of -1 corresponds to no maximum.</p>
      */
     public static final String KEY_MAX_INCREMENT_COUNT = "net.fortuna.ical4j.recur.maxincrementcount";
     private static int maxIncrementCount;
     static {
         final String value = Configurator.getProperty(KEY_MAX_INCREMENT_COUNT);
         if (value != null && value.length() > 0) {
             maxIncrementCount = Integer.parseInt(value);
         } else {
             maxIncrementCount = 1000;
         }
     }
     private transient Log log = LogFactory.getLog(Recur.class);
     private String frequency;
     private Date until;
     private int count = -1;
     private int interval = -1;
     private NumberList secondList;
     private NumberList minuteList;
     private NumberList hourList;
     private WeekDayList dayList;
     private NumberList monthDayList;
     private NumberList yearDayList;
     private NumberList weekNoList;
     private NumberList monthList;
     private NumberList setPosList;
     private String weekStartDay;
     private Map experimentalValues = new HashMap();
     // Calendar field we increment based on frequency.
     private int calIncField;
     /**
      * Default constructor.
      */
     public Recur() {
     }
     /**
      * Constructs a new instance from the specified string value.
      * @param aValue a string representation of a recurrence.
      * @throws ParseException thrown when the specified string contains an invalid representation of an UNTIL date value
      */
     public Recur(final String aValue) throws ParseException {
         final StringTokenizer t = new StringTokenizer(aValue, ";=");
         while (t.hasMoreTokens()) {
             final String token = t.nextToken();
             if (FREQ.equals(token)) {
                 frequency = nextToken(t, token);
             }
             else if (UNTIL.equals(token)) {
                 final String untilString = nextToken(t, token);
                 if (untilString != null && untilString.indexOf("T") >= 0) {
                     until = new DateTime(untilString);
                     // UNTIL must be specified in UTC time..
                     ((DateTime) until).setUtc(true);
                 }
                 else {
                     until = new Date(untilString);
                 }
             }
             else if (COUNT.equals(token)) {
                 count = Integer.parseInt(nextToken(t, token));
             }
             else if (INTERVAL.equals(token)) {
                 interval = Integer.parseInt(nextToken(t, token));
             }
             else if (BYSECOND.equals(token)) {
                 secondList = new NumberList(nextToken(t, token), 0, 59, false);
             }
             else if (BYMINUTE.equals(token)) {
                 minuteList = new NumberList(nextToken(t, token), 0, 59, false);
             }
             else if (BYHOUR.equals(token)) {
                 hourList = new NumberList(nextToken(t, token), 0, 23, false);
             }
             else if (BYDAY.equals(token)) {
                 dayList = new WeekDayList(nextToken(t, token));
             }
             else if (BYMONTHDAY.equals(token)) {
                 monthDayList = new NumberList(nextToken(t, token), 1, 31, true);
             }
             else if (BYYEARDAY.equals(token)) {
                 yearDayList = new NumberList(nextToken(t, token), 1, 366, true);
             }
             else if (BYWEEKNO.equals(token)) {
                 weekNoList = new NumberList(nextToken(t, token), 1, 53, true);
             }
             else if (BYMONTH.equals(token)) {
                 monthList = new NumberList(nextToken(t, token), 1, 12, false);
             }
             else if (BYSETPOS.equals(token)) {
                 setPosList = new NumberList(nextToken(t, token), 1, 366, true);
             }
             else if (WKST.equals(token)) {
                 weekStartDay = nextToken(t, token);
             }
             // assume experimental value..
             else {
                 experimentalValues.put(token, nextToken(t, token));
             }
         }
         validateFrequency();
     }
     private String nextToken(StringTokenizer t, String lastToken) {
         try {
             return t.nextToken();
         }
         catch (NoSuchElementException e) {
             throw new IllegalArgumentException("Missing expected token, last token: " + lastToken);
         }
     }
     /**
      * @param frequency a recurrence frequency string
      * @param until maximum recurrence date
      */
     public Recur(final String frequency, final Date until) {
         this.frequency = frequency;
         this.until = until;
         validateFrequency();
     }
     /**
      * @param frequency a recurrence frequency string
      * @param count maximum recurrence count
      */
     public Recur(final String frequency, final int count) {
         this.frequency = frequency;
         this.count = count;
         validateFrequency();
     }
     /**
      * @return Returns the dayList.
      */
     public final WeekDayList getDayList() {
         if (dayList == null) {
             dayList = new WeekDayList();
         }
         return dayList;
     }
     /**
      * @return Returns the hourList.
      */
     public final NumberList getHourList() {
         if (hourList == null) {
             hourList = new NumberList(0, 23, false);
         }
         return hourList;
     }
     /**
      * @return Returns the minuteList.
      */
     public final NumberList getMinuteList() {
         if (minuteList == null) {
             minuteList = new NumberList(0, 59, false);
         }
         return minuteList;
     }
     /**
      * @return Returns the monthDayList.
      */
     public final NumberList getMonthDayList() {
         if (monthDayList == null) {
             monthDayList = new NumberList(1, 31, true);
         }
         return monthDayList;
     }
     /**
      * @return Returns the monthList.
      */
     public final NumberList getMonthList() {
         if (monthList == null) {
             monthList = new NumberList(1, 12, false);
         }
         return monthList;
     }
     /**
      * @return Returns the secondList.
      */
     public final NumberList getSecondList() {
         if (secondList == null) {
             secondList = new NumberList(0, 59, false);
         }
         return secondList;
     }
     /**
      * @return Returns the setPosList.
      */
     public final NumberList getSetPosList() {
         if (setPosList == null) {
             setPosList = new NumberList(1, 366, true);
         }
         return setPosList;
     }
     /**
      * @return Returns the weekNoList.
      */
     public final NumberList getWeekNoList() {
         if (weekNoList == null) {
             weekNoList = new NumberList(1, 53, true);
         }
         return weekNoList;
     }
     /**
      * @return Returns the yearDayList.
      */
     public final NumberList getYearDayList() {
         if (yearDayList == null) {
             yearDayList = new NumberList(1, 366, true);
         }
         return yearDayList;
     }
     /**
      * @return Returns the count or -1 if the rule does not have a count.
      */
     public final int getCount() {
         return count;
     }
     /**
      * @return Returns the experimentalValues.
      */
     public final Map getExperimentalValues() {
         return experimentalValues;
     }
     /**
      * @return Returns the frequency.
      */
     public final String getFrequency() {
         return frequency;
     }
     /**
      * @return Returns the interval or -1 if the rule does not have an interval defined.
      */
     public final int getInterval() {
         return interval;
     }
     /**
      * @return Returns the until or null if there is none.
      */
     public final Date getUntil() {
         return until;
     }
     /**
      * @return Returns the weekStartDay or null if there is none.
      */
     public final String getWeekStartDay() {
         return weekStartDay;
     }
     /**
      * @param weekStartDay The weekStartDay to set.
      */
     public final void setWeekStartDay(final String weekStartDay) {
         this.weekStartDay = weekStartDay;
     }
     /**
      * {@inheritDoc}
      */
     public final String toString() {
         final StringBuffer b = new StringBuffer();
         b.append(FREQ);
         b.append('=');
         b.append(frequency);
         if (weekStartDay != null) {
             b.append(';');
             b.append(WKST);
             b.append('=');
             b.append(weekStartDay);
         }
         if (until != null) {
             b.append(';');
             b.append(UNTIL);
             b.append('=');
             // Note: date-time representations should always be in UTC time.
             b.append(until);
         }
         if (count >= 1) {
             b.append(';');
             b.append(COUNT);
             b.append('=');
             b.append(count);
         }
         if (interval >= 1) {
             b.append(';');
             b.append(INTERVAL);
             b.append('=');
             b.append(interval);
         }
         if (!getMonthList().isEmpty()) {
             b.append(';');
             b.append(BYMONTH);
             b.append('=');
             b.append(monthList);
         }
         if (!getWeekNoList().isEmpty()) {
             b.append(';');
             b.append(BYWEEKNO);
             b.append('=');
             b.append(weekNoList);
         }
         if (!getYearDayList().isEmpty()) {
             b.append(';');
             b.append(BYYEARDAY);
             b.append('=');
             b.append(yearDayList);
         }
         if (!getMonthDayList().isEmpty()) {
             b.append(';');
             b.append(BYMONTHDAY);
             b.append('=');
             b.append(monthDayList);
         }
         if (!getDayList().isEmpty()) {
             b.append(';');
             b.append(BYDAY);
             b.append('=');
             b.append(dayList);
         }
         if (!getHourList().isEmpty()) {
             b.append(';');
             b.append(BYHOUR);
             b.append('=');
             b.append(hourList);
         }
         if (!getMinuteList().isEmpty()) {
             b.append(';');
             b.append(BYMINUTE);
             b.append('=');
             b.append(minuteList);
         }
         if (!getSecondList().isEmpty()) {
             b.append(';');
             b.append(BYSECOND);
             b.append('=');
             b.append(secondList);
         }
         if (!getSetPosList().isEmpty()) {
             b.append(';');
             b.append(BYSETPOS);
             b.append('=');
             b.append(setPosList);
         }
         return b.toString();
     }
     /**
      * Returns a list of start dates in the specified period represented by this recur. Any date fields not specified by
      * this recur are retained from the period start, and as such you should ensure the period start is initialised
      * correctly.
      * @param periodStart the start of the period
      * @param periodEnd the end of the period
      * @param value the type of dates to generate (i.e. date/date-time)
      * @return a list of dates
      */
     public final DateList getDates(final Date periodStart,
             final Date periodEnd, final Value value) {
         return getDates(periodStart, periodStart, periodEnd, value, -1);
     }
     /**
      * Convenience method for retrieving recurrences in a specified period.
      * @param seed a seed date for generating recurrence instances
      * @param period the period of returned recurrence dates
      * @param value type of dates to generate
      * @return a list of dates
      */
     public final DateList getDates(final Date seed, final Period period,
             final Value value) {
         return getDates(seed, period.getStart(), period.getEnd(), value, -1);
     }
     /**
      * Returns a list of start dates in the specified period represented by this recur. This method includes a base date
      * argument, which indicates the start of the fist occurrence of this recurrence. The base date is used to inject
      * default values to return a set of dates in the correct format. For example, if the search start date (start) is
      * Wed, Mar 23, 12:19PM, but the recurrence is Mon - Fri, 9:00AM - 5:00PM, the start dates returned should all be at
      * 9:00AM, and not 12:19PM.
      * @return a list of dates represented by this recur instance
      * @param seed the start date of this Recurrence's first instance
      * @param periodStart the start of the period
      * @param periodEnd the end of the period
      * @param value the type of dates to generate (i.e. date/date-time)
      */
     public final DateList getDates(final Date seed, final Date periodStart,
             final Date periodEnd, final Value value) {
          return getDates(seed, periodStart, periodEnd, value, -1);
     }
     /**
      * Returns a list of start dates in the specified period represented by this recur. This method includes a base date
      * argument, which indicates the start of the fist occurrence of this recurrence. The base date is used to inject
      * default values to return a set of dates in the correct format. For example, if the search start date (start) is
      * Wed, Mar 23, 12:19PM, but the recurrence is Mon - Fri, 9:00AM - 5:00PM, the start dates returned should all be at
      * 9:00AM, and not 12:19PM.
      * @return a list of dates represented by this recur instance
      * @param seed the start date of this Recurrence's first instance
      * @param periodStart the start of the period
      * @param periodEnd the end of the period
      * @param value the type of dates to generate (i.e. date/date-time)
      * @param maxCount limits the number of instances returned. Up to one years
      *       worth extra may be returned. Less than 0 means no limit
      */
     public final DateList getDates(final Date seed, final Date periodStart,
                                    final Date periodEnd, final Value value,
                                    final int maxCount) {
         final DateList dates = new DateList(value);
         if (seed instanceof DateTime) {
             if (((DateTime) seed).isUtc()) {
                 dates.setUtc(true);
             }
             else {
                 dates.setTimeZone(((DateTime) seed).getTimeZone());
             }
         }
         final Calendar cal = Dates.getCalendarInstance(seed);
         cal.setTime(seed);
         // optimize the start time for selecting candidates
         // (only applicable where a COUNT is not specified)
         if (getCount() < 1) {
             final Calendar seededCal = (Calendar) cal.clone();
             while (seededCal.getTime().before(periodStart)) {
                 cal.setTime(seededCal.getTime());
                 increment(seededCal);
             }
         }
         int invalidCandidateCount = 0;
         int noCandidateIncrementCount = 0;
         Date candidate = null;
         while ((maxCount < 0) || (dates.size() < maxCount)) {
             final Date candidateSeed = Dates.getInstance(cal.getTime(), value);
             if (getUntil() != null && candidate != null
                     && candidate.after(getUntil())) {
                 break;
             }
             if (periodEnd != null && candidate != null
                     && candidate.after(periodEnd)) {
                 break;
             }
             if (getCount() >= 1
                     && (dates.size() + invalidCandidateCount) >= getCount()) {
                 break;
             }
 //            if (Value.DATE_TIME.equals(value)) {
             if (candidateSeed instanceof DateTime) {
                 if (dates.isUtc()) {
                     ((DateTime) candidateSeed).setUtc(true);
                 }
                 else {
                     ((DateTime) candidateSeed).setTimeZone(dates.getTimeZone());
                 }
             }
             final DateList candidates = getCandidates(candidateSeed, value);
             if (!candidates.isEmpty()) {
                 noCandidateIncrementCount = 0;
                 // sort candidates for identifying when UNTIL date is exceeded..
                 Collections.sort(candidates);
                 for (final Iterator i = candidates.iterator(); i.hasNext();) {
                     candidate = (Date) i.next();
                     // don't count candidates that occur before the seed date..
                     if (!candidate.before(seed)) {
                         // candidates exclusive of periodEnd..
                         if (candidate.before(periodStart)
                                 || !candidate.before(periodEnd)) {
                             invalidCandidateCount++;
                         } else if (getCount() >= 1
                                 && (dates.size() + invalidCandidateCount) >= getCount()) {
                             break;
                         } else if (!(getUntil() != null
                                 && candidate.after(getUntil()))) {
                             dates.add(candidate);
                         }
                     }
                 }
             } else {
                 noCandidateIncrementCount++;
                 if ((maxIncrementCount > 0) && (noCandidateIncrementCount > maxIncrementCount)) {
                     break;
                 }
             }
             increment(cal);
         }
         // sort final list..
         Collections.sort(dates);
         return dates;
     }
     /**
      * Returns the the next date of this recurrence given a seed date
      * and start date.  The seed date indicates the start of the fist
      * occurrence of this recurrence. The start date is the
      * starting date to search for the next recurrence.  Return null
      * if there is no occurrence date after start date.
      * @return the next date in the recurrence series after startDate
      * @param seed the start date of this Recurrence's first instance
      * @param startDate the date to start the search
      */
     public final Date getNextDate(final Date seed, final Date startDate) {
         final Calendar cal = Dates.getCalendarInstance(seed);
         cal.setTime(seed);
         // optimize the start time for selecting candidates
         // (only applicable where a COUNT is not specified)
         if (getCount() < 1) {
             final Calendar seededCal = (Calendar) cal.clone();
             while (seededCal.getTime().before(startDate)) {
                 cal.setTime(seededCal.getTime());
                 increment(seededCal);
             }
         }
         int invalidCandidateCount = 0;
         int noCandidateIncrementCount = 0;
         Date candidate = null;
         final Value value = seed instanceof DateTime ? Value.DATE_TIME : Value.DATE;
         while (true) {
             final Date candidateSeed = Dates.getInstance(cal.getTime(), value);
             if (getUntil() != null && candidate != null && candidate.after(getUntil())) {
                 break;
             }
             if (getCount() > 0 && invalidCandidateCount >= getCount()) {
                 break;
             }
             if (Value.DATE_TIME.equals(value)) {
                 if (((DateTime) seed).isUtc()) {
                     ((DateTime) candidateSeed).setUtc(true);
                 }
                 else {
                     ((DateTime) candidateSeed).setTimeZone(((DateTime) seed).getTimeZone());
                 }
             }
             final DateList candidates = getCandidates(candidateSeed, value);
             if (!candidates.isEmpty()) {
                 noCandidateIncrementCount = 0;
                 // sort candidates for identifying when UNTIL date is exceeded..
                 Collections.sort(candidates);
                 for (final Iterator i = candidates.iterator(); i.hasNext();) {
                     candidate = (Date) i.next();
                     // don't count candidates that occur before the seed date..
                     if (!candidate.before(seed)) {
                         // Candidate must be after startDate because
                         // we want the NEXT occurrence
                         if (!candidate.after(startDate)) {
                             invalidCandidateCount++;
                         } else if (getCount() > 0
                                 && invalidCandidateCount >= getCount()) {
                             break;
                         } else if (!(getUntil() != null
                                 && candidate.after(getUntil()))) {
                             return candidate;
                         }
                     }
                 }
             } else {
                 noCandidateIncrementCount++;
                 if ((maxIncrementCount > 0) && (noCandidateIncrementCount > maxIncrementCount)) {
                     break;
                 }
             }
             increment(cal);
         }
         return null;
     }
     /**
      * Increments the specified calendar according to the frequency and interval specified in this recurrence rule.
      * @param cal a java.util.Calendar to increment
      */
     private void increment(final Calendar cal) {
         // initialise interval..
         final int calInterval = (getInterval() >= 1) ? getInterval() : 1;
         cal.add(calIncField, calInterval);
     }
     /**
      * Returns a list of possible dates generated from the applicable BY* rules, using the specified date as a seed.
      * @param date the seed date
      * @param value the type of date list to return
      * @return a DateList
      */
     private DateList getCandidates(final Date date, final Value value) {
         DateList dates = new DateList(value);
         if (date instanceof DateTime) {
             if (((DateTime) date).isUtc()) {
                 dates.setUtc(true);
             }
             else {
                 dates.setTimeZone(((DateTime) date).getTimeZone());
             }
         }
         dates.add(date);
         dates = getMonthVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYMONTH processing: " + dates);
         }
         dates = getWeekNoVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYWEEKNO processing: " + dates);
         }
         dates = getYearDayVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYYEARDAY processing: " + dates);
         }
         dates = getMonthDayVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYMONTHDAY processing: " + dates);
         }
         dates = getDayVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYDAY processing: " + dates);
         }
         dates = getHourVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYHOUR processing: " + dates);
         }
         dates = getMinuteVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYMINUTE processing: " + dates);
         }
         dates = getSecondVariants(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after BYSECOND processing: " + dates);
         }
         dates = applySetPosRules(dates);
         // debugging..
         if (log.isDebugEnabled()) {
             log.debug("Dates after SETPOS processing: " + dates);
         }
         return dates;
     }
     /**
      * Applies BYSETPOS rules to <code>dates</code>. Valid positions are from 1 to the size of the date list. Invalid
      * positions are ignored.
      * @param dates
      */
     private DateList applySetPosRules(final DateList dates) {
         // return if no SETPOS rules specified..
         if (getSetPosList().isEmpty()) {
             return dates;
         }
         // sort the list before processing..
         Collections.sort(dates);
         final DateList setPosDates = getDateListInstance(dates);
         final int size = dates.size();
         for (final Iterator i = getSetPosList().iterator(); i.hasNext();) {
             final Integer setPos = (Integer) i.next();
             final int pos = setPos.intValue();
             if (pos > 0 && pos <= size) {
                 setPosDates.add(dates.get(pos - 1));
             }
             else if (pos < 0 && pos >= -size) {
                 setPosDates.add(dates.get(size + pos));
             }
         }
         return setPosDates;
     }
     /**
      * Applies BYMONTH rules specified in this Recur instance to the specified date list. If no BYMONTH rules are
      * specified the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getMonthVariants(final DateList dates) {
         if (getMonthList().isEmpty()) {
             return dates;
         }
         final DateList monthlyDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             final Calendar cal = Dates.getCalendarInstance(date);
             cal.setTime(date);
             for (final Iterator j = getMonthList().iterator(); j.hasNext();) {
                 final Integer month = (Integer) j.next();
                 // Java months are zero-based..
 //                cal.set(Calendar.MONTH, month.intValue() - 1);
                 cal.roll(Calendar.MONTH, (month.intValue() - 1) - cal.get(Calendar.MONTH));
                 monthlyDates.add(Dates.getInstance(cal.getTime(), monthlyDates.getType()));
             }
         }
         return monthlyDates;
     }
     /**
      * Applies BYWEEKNO rules specified in this Recur instance to the specified date list. If no BYWEEKNO rules are
      * specified the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getWeekNoVariants(final DateList dates) {
         if (getWeekNoList().isEmpty()) {
             return dates;
         }
         final DateList weekNoDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             final Calendar cal = Dates.getCalendarInstance(date);
             cal.setTime(date);
             for (final Iterator j = getWeekNoList().iterator(); j.hasNext();) {
                 final Integer weekNo = (Integer) j.next();
                 cal.set(Calendar.WEEK_OF_YEAR, Dates.getAbsWeekNo(cal.getTime(), weekNo.intValue()));
                 weekNoDates.add(Dates.getInstance(cal.getTime(), weekNoDates.getType()));
             }
         }
         return weekNoDates;
     }
     /**
      * Applies BYYEARDAY rules specified in this Recur instance to the specified date list. If no BYYEARDAY rules are
      * specified the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getYearDayVariants(final DateList dates) {
         if (getYearDayList().isEmpty()) {
             return dates;
         }
         final DateList yearDayDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             final Calendar cal = Dates.getCalendarInstance(date);
             cal.setTime(date);
             for (final Iterator j = getYearDayList().iterator(); j.hasNext();) {
                 final Integer yearDay = (Integer) j.next();
                 cal.set(Calendar.DAY_OF_YEAR, Dates.getAbsYearDay(cal.getTime(), yearDay.intValue()));
                 yearDayDates.add(Dates.getInstance(cal.getTime(), yearDayDates.getType()));
             }
         }
         return yearDayDates;
     }
     /**
      * Applies BYMONTHDAY rules specified in this Recur instance to the specified date list. If no BYMONTHDAY rules are
      * specified the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getMonthDayVariants(final DateList dates) {
         if (getMonthDayList().isEmpty()) {
             return dates;
         }
         final DateList monthDayDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             final Calendar cal = Dates.getCalendarInstance(date);
             cal.setLenient(false);
             cal.setTime(date);
             for (final Iterator j = getMonthDayList().iterator(); j.hasNext();) {
                 final Integer monthDay = (Integer) j.next();
                 try {
                     cal.set(Calendar.DAY_OF_MONTH, Dates.getAbsMonthDay(cal.getTime(), monthDay.intValue()));
                     monthDayDates.add(Dates.getInstance(cal.getTime(), monthDayDates.getType()));
                 }
                 catch (IllegalArgumentException iae) {
                     if (log.isTraceEnabled()) {
                         log.trace("Invalid day of month: " + Dates.getAbsMonthDay(cal
                                 .getTime(), monthDay.intValue()));
                     }
                 }
             }
         }
         return monthDayDates;
     }
     /**
      * Applies BYDAY rules specified in this Recur instance to the specified date list. If no BYDAY rules are specified
      * the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getDayVariants(final DateList dates) {
         if (getDayList().isEmpty()) {
             return dates;
         }
         final DateList weekDayDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             for (final Iterator j = getDayList().iterator(); j.hasNext();) {
                 final WeekDay weekDay = (WeekDay) j.next();
                 // if BYYEARDAY or BYMONTHDAY is specified filter existing
                 // list..
                 if (!getYearDayList().isEmpty() || !getMonthDayList().isEmpty()) {
                     final Calendar cal = Dates.getCalendarInstance(date);
                     cal.setTime(date);
                     if (weekDay.equals(WeekDay.getWeekDay(cal))) {
                         weekDayDates.add(date);
                     }
                 }
                 else {
                     weekDayDates.addAll(getAbsWeekDays(date, dates.getType(), weekDay));
                 }
             }
         }
         return weekDayDates;
     }
     /**
      * Returns a list of applicable dates corresponding to the specified week day in accordance with the frequency
      * specified by this recurrence rule.
      * @param date
      * @param weekDay
      * @return
      */
     private List getAbsWeekDays(final Date date, final Value type, final WeekDay weekDay) {
         final Calendar cal = Dates.getCalendarInstance(date);
         // default week start is Monday per RFC5545
         int calendarWeekStartDay = Calendar.MONDAY;
         if (weekStartDay != null) {
         	calendarWeekStartDay = WeekDay.getCalendarDay(new WeekDay(weekStartDay));
         }
         cal.setFirstDayOfWeek(calendarWeekStartDay);
         cal.setTime(date);
         final DateList days = new DateList(type);
         if (date instanceof DateTime) {
             if (((DateTime) date).isUtc()) {
                 days.setUtc(true);
             }
             else {
                 days.setTimeZone(((DateTime) date).getTimeZone());
             }
         }
         final int calDay = WeekDay.getCalendarDay(weekDay);
         if (calDay == -1) {
             // a matching weekday cannot be identified..
             return days;
         }
         if (DAILY.equals(getFrequency())) {
             if (cal.get(Calendar.DAY_OF_WEEK) == calDay) {
                 days.add(Dates.getInstance(cal.getTime(), type));
             }
         }
         else if (WEEKLY.equals(getFrequency()) || !getWeekNoList().isEmpty()) {
             final int weekNo = cal.get(Calendar.WEEK_OF_YEAR);
             // construct a list of possible week days..
             cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
             while (cal.get(Calendar.DAY_OF_WEEK) != calDay) {
                 cal.add(Calendar.DAY_OF_WEEK, 1);
             }
 //            final int weekNo = cal.get(Calendar.WEEK_OF_YEAR);
             if (cal.get(Calendar.WEEK_OF_YEAR) == weekNo) {
                 days.add(Dates.getInstance(cal.getTime(), type));
 //                cal.add(Calendar.DAY_OF_WEEK, Dates.DAYS_PER_WEEK);
             }
         }
         else if (MONTHLY.equals(getFrequency()) || !getMonthList().isEmpty()) {
             final int month = cal.get(Calendar.MONTH);
             // construct a list of possible month days..
             cal.set(Calendar.DAY_OF_MONTH, 1);
             while (cal.get(Calendar.DAY_OF_WEEK) != calDay) {
                 cal.add(Calendar.DAY_OF_MONTH, 1);
             }
             while (cal.get(Calendar.MONTH) == month) {
                 days.add(Dates.getInstance(cal.getTime(), type));
                 cal.add(Calendar.DAY_OF_MONTH, Dates.DAYS_PER_WEEK);
             }
         }
         else if (YEARLY.equals(getFrequency())) {
             final int year = cal.get(Calendar.YEAR);
             // construct a list of possible year days..
             cal.set(Calendar.DAY_OF_YEAR, 1);
             while (cal.get(Calendar.DAY_OF_WEEK) != calDay) {
                 cal.add(Calendar.DAY_OF_YEAR, 1);
             }
             while (cal.get(Calendar.YEAR) == year) {
                 days.add(Dates.getInstance(cal.getTime(), type));
                 cal.add(Calendar.DAY_OF_YEAR, Dates.DAYS_PER_WEEK);
             }
         }
         return getOffsetDates(days, weekDay.getOffset());
     }
     /**
      * Returns a single-element sublist containing the element of <code>list</code> at <code>offset</code>. Valid
      * offsets are from 1 to the size of the list. If an invalid offset is supplied, all elements from <code>list</code>
      * are added to <code>sublist</code>.
      * @param list
      * @param offset
      * @param sublist
      */
     private List getOffsetDates(final DateList dates, final int offset) {
         if (offset == 0) {
             return dates;
         }
         final List offsetDates = getDateListInstance(dates);
         final int size = dates.size();
         if (offset < 0 && offset >= -size) {
             offsetDates.add(dates.get(size + offset));
         }
         else if (offset > 0 && offset <= size) {
             offsetDates.add(dates.get(offset - 1));
         }
         return offsetDates;
     }
     /**
      * Applies BYHOUR rules specified in this Recur instance to the specified date list. If no BYHOUR rules are
      * specified the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getHourVariants(final DateList dates) {
         if (getHourList().isEmpty()) {
             return dates;
         }
         final DateList hourlyDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             final Calendar cal = Dates.getCalendarInstance(date);
             cal.setTime(date);
             for (final Iterator j = getHourList().iterator(); j.hasNext();) {
                 final Integer hour = (Integer) j.next();
                 cal.set(Calendar.HOUR_OF_DAY, hour.intValue());
                 hourlyDates.add(Dates.getInstance(cal.getTime(), hourlyDates.getType()));
             }
         }
         return hourlyDates;
     }
     /**
      * Applies BYMINUTE rules specified in this Recur instance to the specified date list. If no BYMINUTE rules are
      * specified the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getMinuteVariants(final DateList dates) {
         if (getMinuteList().isEmpty()) {
             return dates;
         }
         final DateList minutelyDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             final Calendar cal = Dates.getCalendarInstance(date);
             cal.setTime(date);
             for (final Iterator j = getMinuteList().iterator(); j.hasNext();) {
                 final Integer minute = (Integer) j.next();
                 cal.set(Calendar.MINUTE, minute.intValue());
                 minutelyDates.add(Dates.getInstance(cal.getTime(), minutelyDates.getType()));
             }
         }
         return minutelyDates;
     }
     /**
      * Applies BYSECOND rules specified in this Recur instance to the specified date list. If no BYSECOND rules are
      * specified the date list is returned unmodified.
      * @param dates
      * @return
      */
     private DateList getSecondVariants(final DateList dates) {
         if (getSecondList().isEmpty()) {
             return dates;
         }
         final DateList secondlyDates = getDateListInstance(dates);
         for (final Iterator i = dates.iterator(); i.hasNext();) {
             final Date date = (Date) i.next();
             final Calendar cal = Dates.getCalendarInstance(date);
             cal.setTime(date);
             for (final Iterator j = getSecondList().iterator(); j.hasNext();) {
                 final Integer second = (Integer) j.next();
                 cal.set(Calendar.SECOND, second.intValue());
                 secondlyDates.add(Dates.getInstance(cal.getTime(), secondlyDates.getType()));
             }
         }
         return secondlyDates;
     }
     private void validateFrequency() {
         if (frequency == null) {
             throw new IllegalArgumentException(
                     "A recurrence rule MUST contain a FREQ rule part.");
         }
         if (SECONDLY.equals(getFrequency())) {
             calIncField = Calendar.SECOND;
         }
         else if (MINUTELY.equals(getFrequency())) {
             calIncField = Calendar.MINUTE;
         }
         else if (HOURLY.equals(getFrequency())) {
             calIncField = Calendar.HOUR_OF_DAY;
         }
         else if (DAILY.equals(getFrequency())) {
             calIncField = Calendar.DAY_OF_YEAR;
         }
         else if (WEEKLY.equals(getFrequency())) {
             calIncField = Calendar.WEEK_OF_YEAR;
         }
         else if (MONTHLY.equals(getFrequency())) {
             calIncField = Calendar.MONTH;
         }
         else if (YEARLY.equals(getFrequency())) {
             calIncField = Calendar.YEAR;
         }
         else {
             throw new IllegalArgumentException("Invalid FREQ rule part '"
                     + frequency + "' in recurrence rule");
         }
     }
     /**
      * @param count The count to set.
      */
     public final void setCount(final int count) {
         this.count = count;
         this.until = null;
     }
     /**
      * @param frequency The frequency to set.
      */
     public final void setFrequency(final String frequency) {
         this.frequency = frequency;
         validateFrequency();
     }
     /**
      * @param interval The interval to set.
      */
     public final void setInterval(final int interval) {
         this.interval = interval;
     }
     /**
      * @param until The until to set.
      */
     public final void setUntil(final Date until) {
         this.until = until;
         this.count = -1;
     }
     /**
      * @param stream
      * @throws IOException
      * @throws ClassNotFoundException
      */
     private void readObject(final java.io.ObjectInputStream stream) throws IOException, ClassNotFoundException {
         stream.defaultReadObject();
         log = LogFactory.getLog(Recur.class);
     }
     /**
      * Instantiate a new datelist with the same type, timezone and utc settings
      *  as the origList.
      * @param origList
      * @return a new empty list.
      */
     private static final DateList getDateListInstance(final DateList origList) {
         final DateList list = new DateList(origList.getType());
         if (origList.isUtc()) {
             list.setUtc(true);
         } else {
             list.setTimeZone(origList.getTimeZone());
         }
         return list;
     }
 }

Caldavsync Sources / annotate

src/net/fortuna/ical4j/model/Recur.java@fb9019fb1bf7 (annotated)

src/net/fortuna/ical4j/model/Recur.java