OffsetModel.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;
/** TAI UTC offset model.
* @see UTCTAIOffsetsLoader
* @author Luc Maisonobe
* @since 7.1
*/
public class OffsetModel {
/** Date of the offset start. */
private final DateComponents start;
/** Reference date of the linear model as a modified julian day. */
private final int mjdRef;
/** Offset at reference date in seconds (TAI minus UTC). */
private final double offset;
/** Offset slope in seconds per UTC day (TAI minus UTC / dUTC). */
private final double slope;
/** Constructor for a linear offset model.
* <p>
* These models were used prior to 1972.
* </p>
* @param start date of the offset start
* @param mjdRef reference date of the linear model as a modified julian day
* @param offset offset at reference date in seconds (TAI minus UTC)
* @param slope offset slope in seconds per UTC day (TAI minus UTC / dUTC)
*/
public OffsetModel(final DateComponents start,
final int mjdRef, final double offset, final double slope) {
this.start = start;
this.mjdRef = mjdRef;
this.offset = offset;
this.slope = slope;
}
/** Constructor for a constant offset model.
* <p>
* These models are used since 1972.
* </p>
* @param start date of the offset start
* @param offset offset at reference date in seconds (TAI minus UTC)
*/
public OffsetModel(final DateComponents start, final int offset) {
this(start, 41317, offset, 0.0);
}
/** Get the date of the offset start.
* @return date of the offset start
*/
public DateComponents getStart() {
return start;
}
/** Get the reference date of the linear model as a modified julian day.
* @return reference date of the linear model as a modified julian day
*/
public int getMJDRef() {
return mjdRef;
}
/** Offset at reference date in seconds (TAI minus UTC).
* @return offset at reference date in seconds (TAI minus UTC)
*/
public double getOffset() {
return offset;
}
/** Offset slope in seconds per UTC day (TAI minus UTC / dUTC).
* @return offset slope in seconds per UTC day (TAI minus UTC / dUTC)
*/
public double getSlope() {
return slope;
}
}