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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.joda;
import org.elasticsearch.ElasticsearchParseException;
import org.joda.time.DateTimeZone;
import org.joda.time.MutableDateTime;
import org.joda.time.format.DateTimeFormatter;
import java.io.IOException;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
/**
*/
public class DateMathParser {
private final FormatDateTimeFormatter dateTimeFormatter;
private final TimeUnit timeUnit;
public DateMathParser(FormatDateTimeFormatter dateTimeFormatter, TimeUnit timeUnit) {
this.dateTimeFormatter = dateTimeFormatter;
this.timeUnit = timeUnit;
}
public long parse(String text, Callable now) {
return parse(text, now, false, null);
}
// Note: we take a callable here for the timestamp in order to be able to figure out
// if it has been used. For instance, the query cache does not cache queries that make
// use of `now`.
public long parse(String text, Callable now, boolean roundCeil, DateTimeZone timeZone) {
long time;
String mathString;
if (text.startsWith("now")) {
try {
time = now.call();
} catch (Exception e) {
throw new ElasticsearchParseException("Could not read the current timestamp", e);
}
mathString = text.substring("now".length());
} else {
int index = text.indexOf("||");
String parseString;
if (index == -1) {
parseString = text;
mathString = ""; // nothing else
} else {
parseString = text.substring(0, index);
mathString = text.substring(index + 2);
}
if (roundCeil) {
time = parseRoundCeilStringValue(parseString, timeZone);
} else {
time = parseStringValue(parseString, timeZone);
}
}
if (mathString.isEmpty()) {
return time;
}
return parseMath(mathString, time, roundCeil, timeZone);
}
private long parseMath(String mathString, long time, boolean roundUp, DateTimeZone timeZone) throws ElasticsearchParseException {
if (timeZone == null) {
timeZone = DateTimeZone.UTC;
}
MutableDateTime dateTime = new MutableDateTime(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++);
MutableDateTime.Property propertyToRound = null;
switch (unit) {
case 'y':
if (round) {
propertyToRound = dateTime.yearOfCentury();
} else {
dateTime.addYears(sign * num);
}
break;
case 'M':
if (round) {
propertyToRound = dateTime.monthOfYear();
} else {
dateTime.addMonths(sign * num);
}
break;
case 'w':
if (round) {
propertyToRound = dateTime.weekOfWeekyear();
} else {
dateTime.addWeeks(sign * num);
}
break;
case 'd':
if (round) {
propertyToRound = dateTime.dayOfMonth();
} else {
dateTime.addDays(sign * num);
}
break;
case 'h':
case 'H':
if (round) {
propertyToRound = dateTime.hourOfDay();
} else {
dateTime.addHours(sign * num);
}
break;
case 'm':
if (round) {
propertyToRound = dateTime.minuteOfHour();
} else {
dateTime.addMinutes(sign * num);
}
break;
case 's':
if (round) {
propertyToRound = dateTime.secondOfMinute();
} else {
dateTime.addSeconds(sign * num);
}
break;
default:
throw new ElasticsearchParseException("unit [" + unit + "] not supported for date math [" + mathString + "]");
}
if (propertyToRound != null) {
if (roundUp) {
propertyToRound.roundCeiling();
dateTime.addMillis(-1); // subtract 1 millisecond to get the largest inclusive value
} else {
propertyToRound.roundFloor();
}
}
}
return dateTime.getMillis();
}
/**
* Get a DateTimeFormatter parser applying timezone if any.
*/
public static DateTimeFormatter getDateTimeFormatterParser(FormatDateTimeFormatter dateTimeFormatter, DateTimeZone timeZone) {
if (dateTimeFormatter == null) {
return null;
}
DateTimeFormatter parser = dateTimeFormatter.parser();
if (timeZone != null) {
parser = parser.withZone(timeZone);
}
return parser;
}
private long parseStringValue(String value, DateTimeZone timeZone) {
try {
DateTimeFormatter parser = getDateTimeFormatterParser(dateTimeFormatter, timeZone);
return parser.parseMillis(value);
} catch (RuntimeException e) {
try {
// When date is given as a numeric value, it's a date in ms since epoch
// By definition, it's a UTC date.
long time = Long.parseLong(value);
return timeUnit.toMillis(time);
} catch (NumberFormatException e1) {
throw new ElasticsearchParseException("failed to parse date field [" + value + "], tried both date format [" + dateTimeFormatter.format() + "], and timestamp number", e);
}
}
}
private long parseRoundCeilStringValue(String value, DateTimeZone timeZone) {
try {
// we create a date time for inclusive upper range, we "include" by default the day level data
// so something like 2011-01-01 will include the full first day of 2011.
// we also use 1970-01-01 as the base for it so we can handle searches like 10:12:55 (just time)
// since when we index those, the base is 1970-01-01
MutableDateTime dateTime = new MutableDateTime(1970, 1, 1, 23, 59, 59, 999, DateTimeZone.UTC);
DateTimeFormatter parser = getDateTimeFormatterParser(dateTimeFormatter, timeZone);
int location = parser.parseInto(dateTime, value, 0);
// if we parsed all the string value, we are good
if (location == value.length()) {
return dateTime.getMillis();
}
// if we did not manage to parse, or the year is really high year which is unreasonable
// see if its a number
if (location <= 0 || dateTime.getYear() > 5000) {
try {
long time = Long.parseLong(value);
return timeUnit.toMillis(time);
} catch (NumberFormatException e1) {
throw new ElasticsearchParseException("failed to parse date field [" + value + "], tried both date format [" + dateTimeFormatter.format() + "], and timestamp number");
}
}
return dateTime.getMillis();
} catch (RuntimeException e) {
try {
long time = Long.parseLong(value);
return timeUnit.toMillis(time);
} catch (NumberFormatException e1) {
throw new ElasticsearchParseException("failed to parse date field [" + value + "], tried both date format [" + dateTimeFormatter.format() + "], and timestamp number", e);
}
}
}
public static DateTimeZone parseZone(String text) throws IOException {
int index = text.indexOf(':');
if (index != -1) {
int beginIndex = text.charAt(0) == '+' ? 1 : 0;
// format like -02:30
return DateTimeZone.forOffsetHoursMinutes(
Integer.parseInt(text.substring(beginIndex, index)),
Integer.parseInt(text.substring(index + 1))
);
} else {
// id, listed here: http://joda-time.sourceforge.net/timezones.html
return DateTimeZone.forID(text);
}
}
}