com.google.ical.compat.javautil.DateIteratorFactory Maven / Gradle / Ivy
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// Copyright (C) 2006 Google Inc.
//
// 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 com.google.ical.compat.javautil;
import com.google.ical.iter.RecurrenceIterable;
import com.google.ical.iter.RecurrenceIterator;
import com.google.ical.iter.RecurrenceIteratorFactory;
import com.google.ical.util.TimeUtils;
import com.google.ical.values.DateTimeValueImpl;
import com.google.ical.values.DateValue;
import com.google.ical.values.DateValueImpl;
import com.google.ical.values.TimeValue;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
/**
* a factory for converting RRULEs and RDATEs into
* Iterator<Date> and Iterable<Date>.
*
* @see RecurrenceIteratorFactory
*
* @author [email protected] (Mike Samuel)
*/
public class DateIteratorFactory {
/**
* given a block of RRULE, EXRULE, RDATE, and EXDATE content lines, parse
* them into a single date iterator.
* @param rdata RRULE, EXRULE, RDATE, and EXDATE lines.
* @param start the first occurrence of the series.
* @param tzid the local timezone -- used to interpret start and any dates in
* RDATE and EXDATE lines that don't have TZID params.
* @param strict true if any failure to parse should result in a
* ParseException. false causes bad content lines to be logged and ignored.
*/
public static DateIterator createDateIterator(
String rdata, Date start, TimeZone tzid, boolean strict)
throws ParseException {
return new RecurrenceIteratorWrapper(
RecurrenceIteratorFactory.createRecurrenceIterator(
rdata, dateToDateValue(start, true),
tzid, strict));
}
/**
* given a block of RRULE, EXRULE, RDATE, and EXDATE content lines, parse
* them into a single date iterable.
* @param rdata RRULE, EXRULE, RDATE, and EXDATE lines.
* @param start the first occurrence of the series.
* @param tzid the local timezone -- used to interpret start and any dates in
* RDATE and EXDATE lines that don't have TZID params.
* @param strict true if any failure to parse should result in a
* ParseException. false causes bad content lines to be logged and ignored.
*/
public static DateIterable createDateIterable(
String rdata, Date start, TimeZone tzid, boolean strict)
throws ParseException {
return new RecurrenceIterableWrapper(
RecurrenceIteratorFactory.createRecurrenceIterable(
rdata, dateToDateValue(start, true),
tzid, strict));
}
/**
* creates a date iterator given a recurrence iterator from
* {@link com.google.ical.iter.RecurrenceIteratorFactory}.
*/
public static DateIterator createDateIterator(RecurrenceIterator rit) {
return new RecurrenceIteratorWrapper(rit);
}
private static final class RecurrenceIterableWrapper
implements DateIterable {
private final RecurrenceIterable it;
public RecurrenceIterableWrapper(RecurrenceIterable it) { this.it = it; }
public DateIterator iterator() {
return new RecurrenceIteratorWrapper(it.iterator());
}
}
private static final class RecurrenceIteratorWrapper
implements DateIterator {
private final RecurrenceIterator it;
RecurrenceIteratorWrapper(RecurrenceIterator it) { this.it = it; }
public boolean hasNext() { return it.hasNext(); }
public Date next() { return dateValueToDate(it.next()); }
public void remove() { throw new UnsupportedOperationException(); }
public void advanceTo(Date d) {
// we need to treat midnight as a date value so that passing in
// dateValueToDate() will not advance past any
// occurrences of some-date-value in the iterator.
it.advanceTo(dateToDateValue(d, true));
}
}
static Date dateValueToDate(DateValue dvUtc) {
GregorianCalendar c = new GregorianCalendar(TimeUtils.utcTimezone());
c.clear();
if (dvUtc instanceof TimeValue) {
TimeValue tvUtc = (TimeValue) dvUtc;
c.set(dvUtc.year(),
dvUtc.month() - 1, // java.util's dates are zero-indexed
dvUtc.day(),
tvUtc.hour(),
tvUtc.minute(),
tvUtc.second());
} else {
c.set(dvUtc.year(),
dvUtc.month() - 1, // java.util's dates are zero-indexed
dvUtc.day(),
0,
0,
0);
}
return c.getTime();
}
static DateValue dateToDateValue(Date date, boolean midnightAsDate) {
GregorianCalendar c = new GregorianCalendar(TimeUtils.utcTimezone());
c.setTime(date);
int h = c.get(Calendar.HOUR_OF_DAY),
m = c.get(Calendar.MINUTE),
s = c.get(Calendar.SECOND);
if (midnightAsDate && 0 == (h | m | s)) {
return new DateValueImpl(c.get(Calendar.YEAR),
c.get(Calendar.MONTH) + 1,
c.get(Calendar.DAY_OF_MONTH));
} else {
return new DateTimeValueImpl(c.get(Calendar.YEAR),
c.get(Calendar.MONTH) + 1,
c.get(Calendar.DAY_OF_MONTH),
h,
m,
s);
}
}
private DateIteratorFactory() {
// uninstantiable
}
}