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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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.elasticsearch.common.time;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.Strings;
import java.time.DayOfWeek;
import java.time.Instant;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjusters;
import java.time.temporal.TemporalQueries;
import java.util.Objects;
import java.util.function.LongSupplier;
/**
* A parser for date/time formatted text with optional date math.
*
* The format of the datetime is configurable, and unix timestamps can also be used. Datemath
* is appended to a datetime with the following syntax:
* ||[+-/](\d+)?[yMwdhHms].
*/
public class JavaDateMathParser implements DateMathParser {
private final JavaDateFormatter formatter;
private final String format;
private final JavaDateFormatter roundupParser;
JavaDateMathParser(String format, JavaDateFormatter formatter, JavaDateFormatter roundupParser) {
this.format = format;
this.roundupParser = roundupParser;
Objects.requireNonNull(formatter);
this.formatter = formatter;
}
@Override
public Instant parse(String text, LongSupplier now, boolean roundUpProperty, ZoneId timeZone) {
Instant time;
String mathString;
if (text.startsWith("now")) {
try {
// TODO only millisecond granularity here!
time = Instant.ofEpochMilli(now.getAsLong());
} catch (Exception e) {
throw new ElasticsearchParseException("could not read the current timestamp", e);
}
mathString = text.substring("now".length());
} else {
int index = text.indexOf("||");
if (index == -1) {
return parseDateTime(text, timeZone, roundUpProperty);
}
time = parseDateTime(text.substring(0, index), timeZone, false);
mathString = text.substring(index + 2);
}
return parseMath(mathString, time, roundUpProperty, timeZone);
}
private Instant parseMath(final String mathString, final Instant time, final boolean roundUpProperty,
ZoneId timeZone) throws ElasticsearchParseException {
if (timeZone == null) {
timeZone = ZoneOffset.UTC;
}
ZonedDateTime dateTime = ZonedDateTime.ofInstant(time, timeZone);
for (int i = 0; i < mathString.length(); ) {
char c = mathString.charAt(i++);
final boolean round;
final int sign;
if (c == '/') {
round = true;
sign = 1;
} else {
round = false;
if (c == '+') {
sign = 1;
} else if (c == '-') {
sign = -1;
} else {
throw new ElasticsearchParseException("operator not supported for date math [{}]", mathString);
}
}
if (i >= mathString.length()) {
throw new ElasticsearchParseException("truncated date math [{}]", mathString);
}
final int num;
if (!Character.isDigit(mathString.charAt(i))) {
num = 1;
} else {
int numFrom = i;
while (i < mathString.length() && Character.isDigit(mathString.charAt(i))) {
i++;
}
if (i >= mathString.length()) {
throw new ElasticsearchParseException("truncated date math [{}]", mathString);
}
num = Integer.parseInt(mathString.substring(numFrom, i));
}
if (round) {
if (num != 1) {
throw new ElasticsearchParseException("rounding `/` can only be used on single unit types [{}]", mathString);
}
}
char unit = mathString.charAt(i++);
switch (unit) {
case 'y':
if (round) {
dateTime = dateTime.withDayOfYear(1).with(LocalTime.MIN);
if (roundUpProperty) {
dateTime = dateTime.plusYears(1);
}
} else {
dateTime = dateTime.plusYears(sign * num);
}
break;
case 'M':
if (round) {
dateTime = dateTime.withDayOfMonth(1).with(LocalTime.MIN);
if (roundUpProperty) {
dateTime = dateTime.plusMonths(1);
}
} else {
dateTime = dateTime.plusMonths(sign * num);
}
break;
case 'w':
if (round) {
dateTime = dateTime.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY)).with(LocalTime.MIN);
if (roundUpProperty) {
dateTime = dateTime.plusWeeks(1);
}
} else {
dateTime = dateTime.plusWeeks(sign * num);
}
break;
case 'd':
if (round) {
dateTime = dateTime.with(LocalTime.MIN);
if (roundUpProperty) {
dateTime = dateTime.plusDays(1);
}
} else {
dateTime = dateTime.plusDays(sign * num);
}
break;
case 'h':
case 'H':
if (round) {
dateTime = dateTime.withMinute(0).withSecond(0).withNano(0);
if (roundUpProperty) {
dateTime = dateTime.plusHours(1);
}
} else {
dateTime = dateTime.plusHours(sign * num);
}
break;
case 'm':
if (round) {
dateTime = dateTime.withSecond(0).withNano(0);
if (roundUpProperty) {
dateTime = dateTime.plusMinutes(1);
}
} else {
dateTime = dateTime.plusMinutes(sign * num);
}
break;
case 's':
if (round) {
dateTime = dateTime.withNano(0);
if (roundUpProperty) {
dateTime = dateTime.plusSeconds(1);
}
} else {
dateTime = dateTime.plusSeconds(sign * num);
}
break;
default:
throw new ElasticsearchParseException("unit [{}] not supported for date math [{}]", unit, mathString);
}
if (round && roundUpProperty) {
// subtract 1 millisecond to get the largest inclusive value
dateTime = dateTime.minus(1, ChronoField.MILLI_OF_SECOND.getBaseUnit());
}
}
return dateTime.toInstant();
}
private Instant parseDateTime(String value, ZoneId timeZone, boolean roundUpIfNoTime) {
if (Strings.isNullOrEmpty(value)) {
throw new ElasticsearchParseException("cannot parse empty date");
}
DateFormatter formatter = roundUpIfNoTime ? this.roundupParser : this.formatter;
try {
if (timeZone == null) {
return DateFormatters.from(formatter.parse(value)).toInstant();
} else {
TemporalAccessor accessor = formatter.parse(value);
ZoneId zoneId = TemporalQueries.zone().queryFrom(accessor);
if (zoneId != null) {
timeZone = zoneId;
}
return DateFormatters.from(accessor).withZoneSameLocal(timeZone).toInstant();
}
} catch (IllegalArgumentException | DateTimeParseException e) {
throw new ElasticsearchParseException("failed to parse date field [{}] with format [{}]: [{}]",
e, value, format, e.getMessage());
}
}
}