Prefix.java

  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;

  19. /** Multiplicative prefixes.
  20.  * @author Luc Maisonobe
  21.  * @since 11.0
  22.  */
  23. enum Prefix {

  25.     /** Septillion. */
  26.     YOTTA("Y", 1.0e24),

  28.     /** Sextillion. */
  29.     ZETTA("Z", 1.0e21),

  31.     /** Quintillion. */
  32.     EXA("E", 1.0e18),

  34.     /** Quadrillion. */
  35.     PETA("P", 1.0e15),

  37.     /** Trillion. */
  38.     TERA("T", 1.0e12),

  40.     /** Billion. */
  41.     GIGA("G", 1.0e9),

  43.     /** Million. */
  44.     MEGA("M", 1.0e6),

  46.     /** Thousand. */
  47.     KILO("k", 1.0e3),

  49.     /** Hundred. */
  50.     HECTO("h", 1.0e2),

  52.     /** Ten. */
  53.     DECA("da", 1.0e1),

  55.     /** Tenth. */
  56.     DECI("d", 1.0e-1),

  58.     /** Hundredth. */
  59.     CENTI("c", 1.0e-2),

  61.     /** Thousandth. */
  62.     MILLI("m", 1.0e-3),

  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),

  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),

  78.     /** Billionth. */
  79.     NANO("n", 1.0e-9),

  81.     /** Trillionth. */
  82.     PICO("p", 1.0e-12),

  84.     /** Quadrillionth. */
  85.     FEMTO("f", 1.0e-15),

  87.     /** Quintillionth. */
  88.     ATTO("a", 1.0e-18),

  90.     /** Sextillionth. */
  91.     ZEPTO("z", 1.0e-21),

  93.     /** Septillionth. */
  94.     YOCTO("y", 1.0e-24);

  96.     /** Symbol. */
  97.     private String symbol;

  99.     /** Multiplication factor. */
  100.     private double factor;

  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.     }

  111.     /** Get the prefix symbol.
  112.      * @return prefix symbol
  113.      */
  114.     public String getSymbol() {
  115.         return symbol;
  116.     }

  118.     /** Get the prefix multiplication factor.
  119.      * @return prefix multiplication factor
  120.      */
  121.     public double getFactor() {
  122.         return factor;
  123.     }

  125. }
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