/**
* This file is part of Graylog2.
*
* Graylog2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog2. If not, see <http://www.gnu.org/licenses/>.
*/
package org.graylog2.utilities.date;
import com.google.common.collect.Maps;
import com.joestelmach.natty.DateGroup;
import com.joestelmach.natty.Parser;
import org.graylog2.plugin.Tools;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
public class NaturalDateParser {
public static final TimeZone UTC = TimeZone.getTimeZone("UTC");
public Result parse(final String string) throws DateNotParsableException {
Date from = null;
Date to = null;
final Parser parser = new Parser(UTC);
final List<DateGroup> groups = parser.parse(string);
if (!groups.isEmpty()) {
final List<Date> dates = groups.get(0).getDates();
if (dates.size() >= 1) {
from = dates.get(0);
}
if (dates.size() >= 2) {
to = dates.get(1);
}
} else {
throw new DateNotParsableException();
}
return new Result(from, to);
}
public static class Result {
private final DateTime from;
private final DateTime to;
public Result(final Date from, final Date to) {
if (from != null) {
this.from = new DateTime(from, DateTimeZone.UTC);
} else {
this.from = Tools.iso8601();
}
if (to != null) {
this.to = new DateTime(to, DateTimeZone.UTC);
} else {
this.to = Tools.iso8601();
}
}
public DateTime getFrom() {
return from;
}
public DateTime getTo() {
return to;
}
public Map<String, String> asMap() {
Map<String, String> result = Maps.newHashMap();
result.put("from", dateFormat(getFrom()));
result.put("to", dateFormat(getTo()));
return result;
}
private String dateFormat(final DateTime x) {
return x.toString(DateTimeFormat.forPattern(Tools.ES_DATE_FORMAT_NO_MS).withZoneUTC());
}
}
public static class DateNotParsableException extends Exception {
}
}