com.google.ical.compat.javatime.ZonedDateTimeIteratorFactory Maven / Gradle / Ivy
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/**
* Copyright (C) 2015, 2016 Dirk Lemmermann Software & Consulting (dlsc.com)
*
* This file is part of CalendarFX.
*/
// 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.javatime;
import com.google.ical.iter.RecurrenceIterable;
import com.google.ical.iter.RecurrenceIterator;
import com.google.ical.iter.RecurrenceIteratorFactory;
import com.google.ical.values.DateTimeValueImpl;
import com.google.ical.values.DateValue;
import com.google.ical.values.TimeValue;
import java.text.ParseException;
import java.time.ZoneId;
import java.time.ZonedDateTime;
/**
* a factory for converting RRULEs and RDATEs into
* Iterator<DateTime> and
* Iterable<DateTime>.
*
* @see RecurrenceIteratorFactory
*
* @author [email protected] (Mike Samuel)
*/
public class ZonedDateTimeIteratorFactory {
/**
* given a block of RRULE, EXRULE, RDATE, and EXDATE content lines, parse
* them into a single date time 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 ZonedDateTimeIterator createDateTimeIterator(
String rdata, ZonedDateTime start, ZoneId tzid, boolean strict)
throws ParseException {
return new RecurrenceIteratorWrapper(
RecurrenceIteratorFactory.createRecurrenceIterator(
rdata, zonedDateTimeToDateValue(start.withZoneSameInstant(tzid)),
TimeZoneConverter.toTimeZone(tzid), strict));
}
/**
* given a block of RRULE, EXRULE, RDATE, and EXDATE content lines, parse
* them into a single date time 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 ZonedDateTimeIterable createDateTimeIterable(
String rdata, ZonedDateTime start, ZoneId tzid, boolean strict)
throws ParseException {
return new RecurrenceIterableWrapper(
RecurrenceIteratorFactory.createRecurrenceIterable(
rdata, zonedDateTimeToDateValue(start.withZoneSameInstant(tzid)),
TimeZoneConverter.toTimeZone(tzid), strict));
}
/**
* creates a date-time iterator given a recurrence iterator from
* {@link com.google.ical.iter.RecurrenceIteratorFactory}.
*/
public static ZonedDateTimeIterator createDateTimeIterator(
RecurrenceIterator rit) {
return new RecurrenceIteratorWrapper(rit);
}
private static final class RecurrenceIterableWrapper
implements ZonedDateTimeIterable {
private final RecurrenceIterable it;
public RecurrenceIterableWrapper(RecurrenceIterable it) {
this.it = it;
}
@Override
public ZonedDateTimeIterator iterator() {
return new RecurrenceIteratorWrapper(it.iterator());
}
}
private static final class RecurrenceIteratorWrapper
implements ZonedDateTimeIterator {
private final RecurrenceIterator it;
RecurrenceIteratorWrapper(RecurrenceIterator it) {
this.it = it;
}
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public ZonedDateTime next() {
return dateValueToDateTime(it.next());
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public void advanceTo(ZonedDateTime d) {
ZonedDateTime dUtc = d.withZoneSameInstant(ZoneId.of("UTC"));
it.advanceTo(zonedDateTimeToDateValue(dUtc));
}
}
static ZonedDateTime dateValueToDateTime(DateValue dvUtc) {
if (dvUtc instanceof TimeValue) {
TimeValue tvUtc = (TimeValue) dvUtc;
return ZonedDateTime.of(
dvUtc.year(),
dvUtc.month(), // java.util's dates are zero-indexed
dvUtc.day(),
tvUtc.hour(),
tvUtc.minute(),
tvUtc.second(),
0,
ZoneId.of("UTC"));
} else {
return ZonedDateTime.of(
dvUtc.year(),
dvUtc.month(), // java.util's dates are zero-indexed
dvUtc.day(),
0,
0,
0,
0,
ZoneId.of("UTC"));
}
}
static DateValue zonedDateTimeToDateValue(ZonedDateTime dt) {
return new DateTimeValueImpl(
dt.getYear(), dt.getMonthValue(), dt.getDayOfMonth(),
dt.getHour(), dt.getMinute(), dt.getSecond());
}
private ZonedDateTimeIteratorFactory() {
// uninstantiable
}
}