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.HashMap;
21  import java.util.List;
22  import java.util.Map;
23  
24  import org.orekit.data.DataContext;
25  import org.orekit.files.ccsds.ndm.NdmConstituent;
26  import org.orekit.files.ccsds.ndm.adm.AdmHeader;
27  import org.orekit.files.general.AttitudeEphemerisFile;
28  import org.orekit.utils.IERSConventions;
29  import org.orekit.utils.TimeStampedAngularCoordinates;
30  
31  /**
32   * This class stores all the information of the Attitude Ephemeris Message (AEM) File parsed
33   * by AEMParser. It contains the header and a list of Attitude Ephemerides Blocks each
34   * containing metadata and a list of attitude ephemerides data lines.
35   * @author Bryan Cazabonne
36   * @since 10.2
37   */
38  public class Aem extends NdmConstituent<AdmHeader, AemSegment>
39      implements AttitudeEphemerisFile<TimeStampedAngularCoordinates, AemSegment> {
40  
41      /** Root element for XML files. */
42      public static final String ROOT = "aem";
43  
44      /** Key for format version. */
45      public static final String FORMAT_VERSION_KEY = "CCSDS_AEM_VERS";
46  
47      /** Simple constructor.
48       * @param header file header
49       * @param segments file segments
50       * @param conventions IERS conventions
51       * @param dataContext used for creating frames, time scales, etc.
52       */
53      public Aem(final AdmHeader header, final List<AemSegment> segments,
54                 final IERSConventions conventions, final DataContext dataContext) {
55          super(header, segments, conventions, dataContext);
56      }
57  
58      /** {@inheritDoc} */
59      @Override
60      public Map<String, AemSatelliteEphemeris> getSatellites() {
61          final Map<String, List<AemSegment>> byId = new HashMap<>();
62          for (final AemSegment segment : getSegments()) {
63              final String id = segment.getMetadata().getObjectID();
64              byId.putIfAbsent(id, new ArrayList<>());
65              byId.get(id).add(segment);
66          }
67          final Map<String, AemSatelliteEphemeris> ret = new HashMap<>();
68          for (final Map.Entry<String, List<AemSegment>> entry : byId.entrySet()) {
69              ret.put(entry.getKey(), new AemSatelliteEphemeris(entry.getKey(), entry.getValue()));
70          }
71          return ret;
72      }
73  
74  }