1   /* Copyright 2002-2021 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;
18  
19  import java.util.Collections;
20  import java.util.List;
21  
22  import org.orekit.data.DataContext;
23  import org.orekit.errors.OrekitException;
24  import org.orekit.errors.OrekitMessages;
25  import org.orekit.files.ccsds.section.Header;
26  import org.orekit.files.ccsds.section.Segment;
27  import org.orekit.utils.IERSConventions;
28  
29  /**
30   * Constituents of a CCSDS Navigation Data Message.
31   * Constituents may be Attitude Data Message (ADM), Orbit Data Message (ODM),
32   * Tracking Data Message (TDM)…
33   * Each constituent has its own header and a list of segments.
34   * @param <H> type of the header
35   * @param <S> type of the segments
36   * @author Bryan Cazabonne
37   * @since 10.2
38   */
39  public abstract class NdmConstituent<H extends Header, S extends Segment<?, ?>> {
40  
41      /** Header. */
42      private final H header;
43  
44      /** segments list. */
45      private final List<S> segments;
46  
47      /** IERS conventions used. */
48      private final IERSConventions conventions;
49  
50      /** Data context. */
51      private final DataContext dataContext;
52  
53      /**
54       * Constructor.
55       * @param header file header
56       * @param segments file segments
57       * @param conventions IERS conventions
58       * @param dataContext used for creating frames, time scales, etc.
59       */
60      protected NdmConstituent(final H header, final List<S> segments,
61                               final IERSConventions conventions, final DataContext dataContext) {
62          this.header      = header;
63          this.segments    = segments;
64          this.conventions = conventions;
65          this.dataContext = dataContext;
66      }
67  
68      /**
69       * Get the header.
70       * @return header
71       * @since 11.0
72       */
73      public H getHeader() {
74          return header;
75      }
76  
77      /**
78       * Get the segments.
79       * @return segments
80       * @since 11.0
81       */
82      public List<S> getSegments() {
83          return Collections.unmodifiableList(segments);
84      }
85  
86      /**
87       * Get IERS conventions.
88       * @return IERS conventions
89       */
90      public IERSConventions getConventions() {
91          if (conventions != null) {
92              return conventions;
93          } else {
94              throw new OrekitException(OrekitMessages.CCSDS_UNKNOWN_CONVENTIONS);
95          }
96      }
97  
98      /**
99       * Get the data context.
100      * @return the data context used for creating frames, time scales, etc.
101      */
102     public DataContext getDataContext() {
103         return dataContext;
104     }
105 
106     /**
107      * Validate the file message for required and forbidden entries.
108      * <p>
109      * This method throws an exception if file does not meet format requirements.
110      * The requirements may depend on format version, which is found in header.
111      * </p>
112      */
113     public void validate() {
114         header.validate(header.getFormatVersion());
115         for (final S segment : segments) {
116             segment.getMetadata().validate(header.getFormatVersion());
117             segment.getData().validate(header.getFormatVersion());
118         }
119     }
120 }