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   * 4-character dimensionless drag coefficient.
23   * <p>
24   * Assumed decimal point is two places from the right. Must contain all  zeros if not used.
25   * <p>
26   * Units: dimensionless
27   * <p>
28   * Valid values:
29   * <ul>
30   * <li> 0 to 99.99</li>
31   * <li>"<code>xxxx</code>", <code>x</code>: Any integer 0-9</li>
32   * </ul>
33   *
34   * @author Nick LaFarge
35   * @since 13.0
36   */
37  public class DragCoefficientTerm extends DoubleValuedIIRVTerm {
38  
39      /** DragCoefficientTerm contains all zeros when not used. */
40      public static final DragCoefficientTerm UNUSED = new DragCoefficientTerm(0);
41  
42      /** The length of the IIRV term within the message. */
43      public static final int DRAG_COEFFICIENT_TERM_LENGTH = 4;
44  
45      /** Regular expression that ensures the validity of string values for this term. */
46      public static final String DRAG_COEFFICIENT_TERM_PATTERN = "\\d{4}";
47  
48      /**
49       * Constructor.
50       * <p>
51       * See {@link DoubleValuedIIRVTerm#DoubleValuedIIRVTerm(String, String, int, int, boolean)}
52       *
53       * @param value value of the drag coefficient term (dimensionless)
54       */
55      public DragCoefficientTerm(final String value) {
56          super(DRAG_COEFFICIENT_TERM_PATTERN, value, DRAG_COEFFICIENT_TERM_LENGTH, 2, false);
57      }
58  
59      /**
60       * Constructor.
61       * <p>
62       * See {@link DoubleValuedIIRVTerm#DoubleValuedIIRVTerm(String, double, int, int, boolean)}
63       *
64       * @param value value of the drag coefficient term (dimensionless)
65       */
66      public DragCoefficientTerm(final double value) {
67          super(DRAG_COEFFICIENT_TERM_PATTERN, value, DRAG_COEFFICIENT_TERM_LENGTH, 2, false);
68      }
69  }