/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.stanbol.enhancer.topic;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
/**
* Utilities to compute UTC timestamp to make Solr queries independent of the locale of the server.
*/
public final class UTCTimeStamper {
/**
* Restrict instantiation
*/
private UTCTimeStamper() {}
protected static final TimeZone UTC = TimeZone.getTimeZone("UTC");
/**
* @return format a date in the timezone as an UTC ISO 8601 string up to the millisecond precision.
*/
public static String utcIsoString(Date date) {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");
df.setTimeZone(UTC);
return df.format(date) + "Z";
}
/**
* @return ISO 8601 serialization of the current date in the UTC timezone suitable for range queries on
* Solr.
*/
public static String nowUtcIsoString() {
return utcIsoString(nowUtcDate());
}
/**
* @return current date in the UTC timezone suitable for storage in a date field of a Solr index.
*/
public static Date nowUtcDate() {
return (new GregorianCalendar(UTC)).getTime();
}
}