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/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
package org.apache.hc.core5.http.protocol;
import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.TimeZone;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
/**
* Generates a date in the format required by the HTTP protocol.
*
* @since 4.0
*/
@Contract(threading = ThreadingBehavior.SAFE)
public class HttpDateGenerator {
private static final int GRANULARITY_MILLIS = 1000;
/** Date format pattern used to generate the header in RFC 1123 format. */
public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";
/**
* @deprecated This attribute is no longer supported as a part of the public API.
* The time zone to use in the date header.
*/
@Deprecated
public static final TimeZone GMT = TimeZone.getTimeZone("GMT");
public static final ZoneId GMT_ID = ZoneId.of("GMT");
/** Singleton instance. */
public static final HttpDateGenerator INSTANCE = new HttpDateGenerator(PATTERN_RFC1123, GMT_ID);
private final DateTimeFormatter dateTimeFormatter;
private long dateAsMillis;
private String dateAsText;
private ZoneId zoneId;
HttpDateGenerator() {
dateTimeFormatter =new DateTimeFormatterBuilder()
.parseLenient()
.parseCaseInsensitive()
.appendPattern(PATTERN_RFC1123)
.toFormatter();
zoneId = GMT_ID;
}
private HttpDateGenerator(final String pattern, final ZoneId zoneId) {
dateTimeFormatter = new DateTimeFormatterBuilder()
.parseLenient()
.parseCaseInsensitive()
.appendPattern(pattern)
.toFormatter();
this.zoneId = zoneId;
}
public synchronized String getCurrentDate() {
final long now = System.currentTimeMillis();
if (now - this.dateAsMillis > GRANULARITY_MILLIS) {
// Generate new date string
dateAsText = dateTimeFormatter.format(Instant.now().atZone(zoneId));
dateAsMillis = now;
}
return dateAsText;
}
}