OffsetModel.java
- /* Copyright 2002-2016 CS Systèmes d'Information
- * Licensed to CS Systèmes d'Information (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;
- }
- }