1   /* Copyright 2002-2025 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.files.ccsds.ndm.adm.aem;
18  
19  import java.util.ArrayList;
20  import java.util.Collections;
21  import java.util.List;
22  
23  import org.orekit.files.ccsds.section.CommentsContainer;
24  import org.orekit.files.ccsds.section.Data;
25  import org.orekit.utils.TimeStampedAngularCoordinates;
26  
27  /**
28   * The Attitude Ephemerides data blocks class contain list of attitude data points.
29   * <p>
30   * Beware that the Orekit getters and setters all rely on SI units. The parsers
31   * and writers take care of converting these SI units into CCSDS mandatory units.
32   * The {@link org.orekit.utils.units.Unit Unit} class provides useful
33   * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
34   * {@link org.orekit.utils.units.Unit#toSI(double) toSI} methods in case the callers
35   * already use CCSDS units instead of the API SI units. The general-purpose
36   * {@link org.orekit.utils.units.Unit Unit} class (without an 's') and the
37   * CCSDS-specific {@link org.orekit.files.ccsds.definitions.Units Units} class
38   * (with an 's') also provide some predefined units. These predefined units and the
39   * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
40   * {@link org.orekit.utils.units.Unit#toSI(double) toSI} conversion methods are indeed
41   * what the parsers and writers use for the conversions.
42   * </p>
43   * @author Bryan Cazabonne
44   */
45  public class AemData extends CommentsContainer implements Data {
46  
47      /** List of data lines. */
48      private final List<TimeStampedAngularCoordinates> attitudeDataLines;
49  
50      /**
51       * Constructor.
52       */
53      public AemData() {
54          attitudeDataLines = new ArrayList<>();
55      }
56  
57      /** Add a data point.
58       * @param data data point to add
59       * @return always return {@code true}
60       */
61      public boolean addData(final TimeStampedAngularCoordinates data) {
62          refuseFurtherComments();
63          attitudeDataLines.add(data);
64          return true;
65      }
66  
67      /** Get an unmodifiable view of the data points.
68       * @return unmodifiable view of the data points
69       */
70      public List<TimeStampedAngularCoordinates> getAngularCoordinates() {
71          return Collections.unmodifiableList(attitudeDataLines);
72      }
73  
74  }