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/*
 * Copyright 2018 Marten Gajda 
 *
 *
 * 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 org.dmfs.rfc5545.recur;

import org.dmfs.rfc5545.Instance;
import org.dmfs.rfc5545.calendarmetrics.CalendarMetrics;
import org.dmfs.rfc5545.recur.RecurrenceRule.Part;


/**
 * A filter that expands recurrence rules by day of year. This filter expands instances for YEARLY, MONTHLY and WEEKLY rules. 

Note: RFC 5545 Doesn't allow BYYEARDAY to be used with DAILY, WEEKLY and MONTHLY rules, but RFC 2445 * does. This filter tries to return a reasonable result for these cases. In particular that means we expand MONTHLY and WEEKLY rules and filter DAILY rules. *

* * @author Marten Gajda */ final class ByYearDayWeeklyExpander extends ByExpander { /** * The year days to let pass or to expand. */ private final int[] mYearDays; public ByYearDayWeeklyExpander(RecurrenceRule rule, RuleIterator previous, CalendarMetrics calendarMetrics, long start) { super(previous, calendarMetrics, start); mYearDays = StaticUtils.ListToSortedArray(rule.getByPart(Part.BYYEARDAY)); } @Override void expand(long instance, long start) { int year = Instance.year(instance); int month = Instance.month(instance); int dayOfMonth = Instance.dayOfMonth(instance); int hour = Instance.hour(instance); int minute = Instance.minute(instance); int second = Instance.second(instance); int yearDays = mCalendarMetrics.getDaysPerYear(year); for (int day : mYearDays) { int actualDay = day; if (day < 0) { actualDay = day + yearDays + 1; } int prevYearDays = mCalendarMetrics.getDaysPerYear(year - 1); int nextYearDays = mCalendarMetrics.getDaysPerYear(year + 1); int prevYearDay = day; int nextYearDay = day; if (day < 0) { prevYearDay = day + prevYearDays + 1; nextYearDay = day + nextYearDays + 1; } int oldWeek = mCalendarMetrics.getWeekOfYear(year, month, dayOfMonth); /* * Add instance only if the week didn't change. */ int newWeek = mCalendarMetrics.getWeekOfYear(year, actualDay); if (0 < actualDay && actualDay <= yearDays && newWeek == oldWeek) { int monthAndDay = mCalendarMetrics.getMonthAndDayOfYearDay(year, actualDay); addInstance(Instance.setMonthAndDayOfMonth(instance, CalendarMetrics.packedMonth(monthAndDay), CalendarMetrics.dayOfMonth(monthAndDay))); } else if (0 < nextYearDay && nextYearDay <= nextYearDays && nextYearDay < 7) { /* * The day might belong to the next year. Add instance only if the week didn't change. */ newWeek = mCalendarMetrics.getWeekOfYear(year + 1, nextYearDay); if (newWeek == oldWeek) { int monthAndDay = mCalendarMetrics.getMonthAndDayOfYearDay(year + 1, nextYearDay); addInstance( Instance.make(year + 1, CalendarMetrics.packedMonth(monthAndDay), CalendarMetrics.dayOfMonth(monthAndDay), hour, minute, second)); } } else if (0 < prevYearDay && prevYearDay <= prevYearDays && prevYearDay > prevYearDays - 7) { /* * The day might belong to the previous year. Add instance only if the week didn't change. */ newWeek = mCalendarMetrics.getWeekOfYear(year - 1, prevYearDay); if (newWeek == oldWeek) { int monthAndDay = mCalendarMetrics.getMonthAndDayOfYearDay(year - 1, prevYearDay); addInstance( Instance.make(year - 1, CalendarMetrics.packedMonth(monthAndDay), CalendarMetrics.dayOfMonth(monthAndDay), hour, minute, second)); } } } } }




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