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.utils.units;
18  
19  /** Multiplicative prefixes.
20   * @author Luc Maisonobe
21   * @since 11.0
22   */
23  enum Prefix {
24  
25      /** Septillion. */
26      YOTTA("Y", 1.0e24),
27  
28      /** Sextillion. */
29      ZETTA("Z", 1.0e21),
30  
31      /** Quintillion. */
32      EXA("E", 1.0e18),
33  
34      /** Quadrillion. */
35      PETA("P", 1.0e15),
36  
37      /** Trillion. */
38      TERA("T", 1.0e12),
39  
40      /** Billion. */
41      GIGA("G", 1.0e9),
42  
43      /** Million. */
44      MEGA("M", 1.0e6),
45  
46      /** Thousand. */
47      KILO("k", 1.0e3),
48  
49      /** Hundred. */
50      HECTO("h", 1.0e2),
51  
52      /** Ten. */
53      DECA("da", 1.0e1),
54  
55      /** Tenth. */
56      DECI("d", 1.0e-1),
57  
58      /** Hundredth. */
59      CENTI("c", 1.0e-2),
60  
61      /** Thousandth. */
62      MILLI("m", 1.0e-3),
63  
64      /** Millionth.
65       * <p>
66       * The symbol used here is the standard SI one: µ (U+00B5, MICRO SIGN)
67       * </p>
68       */
69      MICRO("µ", 1.0e-6),
70  
71      /** Millionth.
72       * <p>
73       * The symbol used here is an alternate one: μ (U+03BC, GREEK SMALL LETTER MU)
74       * </p>
75       */
76      MICRO_ALTERNATE("μ", 1.0e-6),
77  
78      /** Billionth. */
79      NANO("n", 1.0e-9),
80  
81      /** Trillionth. */
82      PICO("p", 1.0e-12),
83  
84      /** Quadrillionth. */
85      FEMTO("f", 1.0e-15),
86  
87      /** Quintillionth. */
88      ATTO("a", 1.0e-18),
89  
90      /** Sextillionth. */
91      ZEPTO("z", 1.0e-21),
92  
93      /** Septillionth. */
94      YOCTO("y", 1.0e-24);
95  
96      /** Symbol. */
97      private String symbol;
98  
99      /** Multiplication factor. */
100     private double factor;
101 
102     /** Simple constructor.
103      * @param symbol symbol
104      * @param factor multiplication factor
105      */
106     Prefix(final String symbol, final double factor) {
107         this.symbol = symbol;
108         this.factor = factor;
109     }
110 
111     /** Get the prefix symbol.
112      * @return prefix symbol
113      */
114     public String getSymbol() {
115         return symbol;
116     }
117 
118     /** Get the prefix multiplication factor.
119      * @return prefix multiplication factor
120      */
121     public double getFactor() {
122         return factor;
123     }
124 
125 }