GLONASSScale.java
/* Copyright 2002-2022 CS GROUP
* Licensed to CS GROUP (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* CS 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.orekit.time;
import org.hipparchus.CalculusFieldElement;
/** GLONASS time scale.
* <p>By convention, TGLONASS = UTC + 3 hours.</p>
* <p>The time scale is defined in <a
* href="http://www.spacecorp.ru/upload/iblock/1c4/cgs-aaixymyt%205.1%20ENG%20v%202014.02.18w.pdf">
* Global Navigation Sattelite System GLONASS - Interface Control document</a>, version 5.1 2008
* (the typo in the title is in the original document title).
* </p>
* <p>This is intended to be accessed thanks to {@link TimeScales},
* so there is no public constructor.</p>
* @author Luc Maisonobe
* @see AbsoluteDate
*/
public class GLONASSScale implements TimeScale {
/** Serializable UID. */
private static final long serialVersionUID = 20160331L;
/** Constant offset with respect to UTC (3 hours). */
private static final double OFFSET = 10800;
/** UTC time scale. */
private final UTCScale utc;
/** Package private constructor for the factory.
* @param utc underlying UTC scale
*/
GLONASSScale(final UTCScale utc) {
this.utc = utc;
}
/** {@inheritDoc} */
@Override
public double offsetFromTAI(final AbsoluteDate date) {
return OFFSET + utc.offsetFromTAI(date);
}
/** {@inheritDoc} */
@Override
public <T extends CalculusFieldElement<T>> T offsetFromTAI(final FieldAbsoluteDate<T> date) {
return utc.offsetFromTAI(date).add(OFFSET);
}
/** {@inheritDoc} */
@Override
public double offsetToTAI(final DateComponents date, final TimeComponents time) {
final DateTimeComponents utcComponents =
new DateTimeComponents(new DateTimeComponents(date, time), -OFFSET);
return utc.offsetToTAI(utcComponents.getDate(), utcComponents.getTime()) - OFFSET;
}
/** {@inheritDoc} */
@Override
public boolean insideLeap(final AbsoluteDate date) {
return utc.insideLeap(date);
}
/** {@inheritDoc} */
@Override
public <T extends CalculusFieldElement<T>> boolean insideLeap(final FieldAbsoluteDate<T> date) {
return utc.insideLeap(date);
}
/** {@inheritDoc} */
@Override
public int minuteDuration(final AbsoluteDate date) {
return utc.minuteDuration(date);
}
/** {@inheritDoc} */
@Override
public <T extends CalculusFieldElement<T>> int minuteDuration(final FieldAbsoluteDate<T> date) {
return utc.minuteDuration(date);
}
/** {@inheritDoc} */
@Override
public double getLeap(final AbsoluteDate date) {
return utc.getLeap(date);
}
/** {@inheritDoc} */
@Override
public <T extends CalculusFieldElement<T>> T getLeap(final FieldAbsoluteDate<T> date) {
return utc.getLeap(date);
}
/** {@inheritDoc} */
public String getName() {
return "GLONASS";
}
/** {@inheritDoc} */
public String toString() {
return getName();
}
}