1   /* Copyright 2024-2025 The Johns Hopkins University Applied Physics Laboratory
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.iirv.terms;
18  
19  import org.orekit.files.iirv.terms.base.DoubleValuedIIRVTerm;
20  
21  /**
22   * 5-character average satellite cross-sectional area in square meters with a resolution to the nearest hundredth of a
23   * square meter.
24   * <p>
25   * Assumed decimal point is two places from the right. Must contain all zeros if not used.
26   * <p>
27   * Units: m^2
28   * <p>
29   * Valid values: <br>
30   * <ul>
31   * <li>0 to 999.99</li>
32   * <li>[String]: Any integer 0-9 for characters 1-5 </li>
33   * </ul>
34   *
35   * @author Nick LaFarge
36   * @since 13.0
37   */
38  public class CrossSectionalAreaTerm extends DoubleValuedIIRVTerm {
39  
40      /** CrossSectionalAreaTerm contains all zeros when not used. */
41      public static final CrossSectionalAreaTerm UNUSED = new CrossSectionalAreaTerm(0);
42  
43      /** The length of the IIRV term within the message. */
44      public static final int CROSS_SECTIONAL_AREA_TERM_LENGTH = 5;
45  
46      /** Regular expression that ensures the validity of string values for this term. */
47      public static final String CROSS_SECTIONAL_AREA_TERM_PATTERN = "\\d{5}";
48  
49      /**
50       * Constructor.
51       * <p>
52       * See {@link DoubleValuedIIRVTerm#DoubleValuedIIRVTerm(String, String, int, int, boolean)}
53       *
54       * @param value value of the cross-sectional area (m^2)
55       */
56      public CrossSectionalAreaTerm(final String value) {
57          super(CROSS_SECTIONAL_AREA_TERM_PATTERN, value, CROSS_SECTIONAL_AREA_TERM_LENGTH, 2, false);
58      }
59  
60      /**
61       * Constructor.
62       * <p>
63       * See {@link DoubleValuedIIRVTerm#DoubleValuedIIRVTerm(String, double, int, int, boolean)}
64       *
65       * @param value value of the cross-sectional area (m^2)
66       */
67      public CrossSectionalAreaTerm(final double value) {
68          super(CROSS_SECTIONAL_AREA_TERM_PATTERN, value, CROSS_SECTIONAL_AREA_TERM_LENGTH, 2, false);
69      }
70  }