| 1 | /* |
| 2 | * JScience - Java(TM) Tools and Libraries for the Advancement of Sciences. |
| 3 | * Copyright (C) 2006 - JScience (http://jscience.org/) |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Permission to use, copy, modify, and distribute this software is |
| 7 | * freely granted, provided that this notice is preserved. |
| 8 | */ |
| 9 | package javax.measure.unit; |
| 10 | |
| 11 | import java.util.Collections; |
| 12 | import java.util.HashSet; |
| 13 | import java.util.Set; |
| 14 | |
| 15 | import javax.measure.converter.MultiplyConverter; |
| 16 | import javax.measure.converter.RationalConverter; |
| 17 | import javax.measure.quantity.*; |
| 18 | |
| 19 | /** |
| 20 | * <p> This class contains SI (Système International d'Unités) base units, |
| 21 | * and derived units.</p> |
| 22 | * |
| 23 | * <p> It also defines the 20 SI prefixes used to form decimal multiples and |
| 24 | * submultiples of SI units. For example:[code] |
| 25 | * import static org.jscience.physics.units.SI.*; // Static import. |
| 26 | * ... |
| 27 | * Unit<Pressure> HECTO_PASCAL = HECTO(PASCAL); |
| 28 | * Unit<Length> KILO_METER = KILO(METER); |
| 29 | * [/code]</p> |
| 30 | * |
| 31 | * @author <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a> |
| 32 | * @version 4.2, August 26, 2006 |
| 33 | * @see <a href="http://en.wikipedia.org/wiki/SI">Wikipedia: SI</a> |
| 34 | * @see <a href="http://en.wikipedia.org/wiki/SI_prefix">Wikipedia: SI prefix</a> |
| 35 | */ |
| 36 | public final class SI extends SystemOfUnits { |
| 37 | |
| 38 | /** |
| 39 | * Holds collection of SI units. |
| 40 | */ |
| 41 | private static HashSet<Unit<?>> UNITS = new HashSet<Unit<?>>(); |
| 42 | |
| 43 | /** |
| 44 | * Default constructor (prevents this class from being instantiated). |
| 45 | */ |
| 46 | private SI() { |
| 47 | } |
| 48 | |
| 49 | |
| 50 | /** |
| 51 | * Returns the unique instance of this class. |
| 52 | * |
| 53 | * @return the SI instance. |
| 54 | */ |
| 55 | public static SI getInstance() { |
| 56 | return INSTANCE; |
| 57 | } |
| 58 | private static final SI INSTANCE = new SI(); |
| 59 | |
| 60 | //////////////// |
| 61 | // BASE UNITS // |
| 62 | //////////////// |
| 63 | |
| 64 | /** |
| 65 | * The base unit for electric current quantities (<code>A</code>). |
| 66 | * The Ampere is that constant current which, if maintained in two straight |
| 67 | * parallel conductors of infinite length, of negligible circular |
| 68 | * cross-section, and placed 1 metre apart in vacuum, would produce between |
| 69 | * these conductors a force equal to 2 × 10-7 newton per metre of length. |
| 70 | * It is named after the French physicist Andre Ampere (1775-1836). |
| 71 | */ |
| 72 | public static final BaseUnit<ElectricCurrent> AMPERE = si(new BaseUnit<ElectricCurrent>( |
| 73 | "A")); |
| 74 | |
| 75 | /** |
| 76 | * The base unit for luminous intensity quantities (<code>cd</code>). |
| 77 | * The candela is the luminous intensity, in a given direction, |
| 78 | * of a source that emits monochromatic radiation of frequency |
| 79 | * 540 × 1012 hertz and that has a radiant intensity in that |
| 80 | * direction of 1/683 watt per steradian |
| 81 | * @see <a href="http://en.wikipedia.org/wiki/Candela"> |
| 82 | * Wikipedia: Candela</a> |
| 83 | */ |
| 84 | public static final BaseUnit<LuminousIntensity> CANDELA = si(new BaseUnit<LuminousIntensity>( |
| 85 | "cd")); |
| 86 | |
| 87 | /** |
| 88 | * The base unit for thermodynamic temperature quantities (<code>K</code>). |
| 89 | * The kelvin is the 1/273.16th of the thermodynamic temperature of the |
| 90 | * triple point of water. It is named after the Scottish mathematician and |
| 91 | * physicist William Thomson 1st Lord Kelvin (1824-1907) |
| 92 | */ |
| 93 | public static final BaseUnit<Temperature> KELVIN = si(new BaseUnit<Temperature>( |
| 94 | "K")); |
| 95 | |
| 96 | /** |
| 97 | * The base unit for mass quantities (<code>kg</code>). |
| 98 | * It is the only SI unit with a prefix as part of its name and symbol. |
| 99 | * The kilogram is equal to the mass of an international prototype in the |
| 100 | * form of a platinum-iridium cylinder kept at Sevres in France. |
| 101 | * @see #GRAM |
| 102 | */ |
| 103 | public static final BaseUnit<Mass> KILOGRAM = si(new BaseUnit<Mass>("kg")); |
| 104 | |
| 105 | /** |
| 106 | * The base unit for length quantities (<code>m</code>). |
| 107 | * One meter was redefined in 1983 as the distance traveled by light in |
| 108 | * a vacuum in 1/299,792,458 of a second. |
| 109 | */ |
| 110 | public static final BaseUnit<Length> METRE = si(new BaseUnit<Length>("m")); |
| 111 | |
| 112 | /** |
| 113 | * Equivalent to {@link #METRE} (American spelling). |
| 114 | */ |
| 115 | public static final Unit<Length> METER = METRE; |
| 116 | |
| 117 | /** |
| 118 | * The base unit for amount of substance quantities (<code>mol</code>). |
| 119 | * The mole is the amount of substance of a system which contains as many |
| 120 | * elementary entities as there are atoms in 0.012 kilogram of carbon 12. |
| 121 | */ |
| 122 | public static final BaseUnit<AmountOfSubstance> MOLE = si(new BaseUnit<AmountOfSubstance>( |
| 123 | "mol")); |
| 124 | |
| 125 | /** |
| 126 | * The base unit for duration quantities (<code>s</code>). |
| 127 | * It is defined as the duration of 9,192,631,770 cycles of radiation |
| 128 | * corresponding to the transition between two hyperfine levels of |
| 129 | * the ground state of cesium (1967 Standard). |
| 130 | */ |
| 131 | public static final BaseUnit<Duration> SECOND = si(new BaseUnit<Duration>( |
| 132 | "s")); |
| 133 | |
| 134 | //////////////////////////////// |
| 135 | // SI DERIVED ALTERNATE UNITS // |
| 136 | //////////////////////////////// |
| 137 | |
| 138 | /** |
| 139 | * The derived unit for mass quantities (<code>g</code>). |
| 140 | * The base unit for mass quantity is {@link #KILOGRAM}. |
| 141 | */ |
| 142 | public static final Unit<Mass> GRAM = KILOGRAM.divide(1000); |
| 143 | |
| 144 | /** |
| 145 | * The unit for plane angle quantities (<code>rad</code>). |
| 146 | * One radian is the angle between two radii of a circle such that the |
| 147 | * length of the arc between them is equal to the radius. |
| 148 | */ |
| 149 | public static final AlternateUnit<Angle> RADIAN = si(new AlternateUnit<Angle>( |
| 150 | "rad", Unit.ONE)); |
| 151 | |
| 152 | /** |
| 153 | * The unit for solid angle quantities (<code>sr</code>). |
| 154 | * One steradian is the solid angle subtended at the center of a sphere by |
| 155 | * an area on the surface of the sphere that is equal to the radius squared. |
| 156 | * The total solid angle of a sphere is 4*Pi steradians. |
| 157 | */ |
| 158 | public static final AlternateUnit<SolidAngle> STERADIAN = si(new AlternateUnit<SolidAngle>( |
| 159 | "sr", Unit.ONE)); |
| 160 | |
| 161 | /** |
| 162 | * The unit for binary information (<code>bit</code>). |
| 163 | */ |
| 164 | public static final AlternateUnit<DataAmount> BIT = si(new AlternateUnit<DataAmount>( |
| 165 | "bit", Unit.ONE)); |
| 166 | |
| 167 | /** |
| 168 | * The derived unit for frequency (<code>Hz</code>). |
| 169 | * A unit of frequency equal to one cycle per second. |
| 170 | * After Heinrich Rudolf Hertz (1857-1894), German physicist who was the |
| 171 | * first to produce radio waves artificially. |
| 172 | */ |
| 173 | public static final AlternateUnit<Frequency> HERTZ = si(new AlternateUnit<Frequency>( |
| 174 | "Hz", Unit.ONE.divide(SECOND))); |
| 175 | |
| 176 | /** |
| 177 | * The derived unit for force (<code>N</code>). |
| 178 | * One newton is the force required to give a mass of 1 kilogram an Force |
| 179 | * of 1 metre per second per second. It is named after the English |
| 180 | * mathematician and physicist Sir Isaac Newton (1642-1727). |
| 181 | */ |
| 182 | public static final AlternateUnit<Force> NEWTON = si(new AlternateUnit<Force>( |
| 183 | "N", METRE.times(KILOGRAM).divide(SECOND.pow(2)))); |
| 184 | |
| 185 | /** |
| 186 | * The derived unit for pressure, stress (<code>Pa</code>). |
| 187 | * One pascal is equal to one newton per square meter. It is named after |
| 188 | * the French philosopher and mathematician Blaise Pascal (1623-1662). |
| 189 | */ |
| 190 | public static final AlternateUnit<Pressure> PASCAL = si(new AlternateUnit<Pressure>( |
| 191 | "Pa", NEWTON.divide(METRE.pow(2)))); |
| 192 | |
| 193 | /** |
| 194 | * The derived unit for energy, work, quantity of heat (<code>J</code>). |
| 195 | * One joule is the amount of work done when an applied force of 1 newton |
| 196 | * moves through a distance of 1 metre in the direction of the force. |
| 197 | * It is named after the English physicist James Prescott Joule (1818-1889). |
| 198 | */ |
| 199 | public static final AlternateUnit<Energy> JOULE = si(new AlternateUnit<Energy>( |
| 200 | "J", NEWTON.times(METRE))); |
| 201 | |
| 202 | /** |
| 203 | * The derived unit for power, radiant, flux (<code>W</code>). |
| 204 | * One watt is equal to one joule per second. It is named after the British |
| 205 | * scientist James Watt (1736-1819). |
| 206 | */ |
| 207 | public static final AlternateUnit<Power> WATT = si(new AlternateUnit<Power>( |
| 208 | "W", JOULE.divide(SECOND))); |
| 209 | |
| 210 | /** |
| 211 | * The derived unit for electric charge, quantity of electricity |
| 212 | * (<code>C</code>). |
| 213 | * One Coulomb is equal to the quantity of charge transferred in one second |
| 214 | * by a steady current of one ampere. It is named after the French physicist |
| 215 | * Charles Augustin de Coulomb (1736-1806). |
| 216 | */ |
| 217 | public static final AlternateUnit<ElectricCharge> COULOMB = si(new AlternateUnit<ElectricCharge>( |
| 218 | "C", SECOND.times(AMPERE))); |
| 219 | |
| 220 | /** |
| 221 | * The derived unit for electric potential difference, electromotive force |
| 222 | * (<code>V</code>). |
| 223 | * One Volt is equal to the difference of electric potential between two |
| 224 | * points on a conducting wire carrying a constant current of one ampere |
| 225 | * when the power dissipated between the points is one watt. It is named |
| 226 | * after the Italian physicist Count Alessandro Volta (1745-1827). |
| 227 | */ |
| 228 | public static final AlternateUnit<ElectricPotential> VOLT = si(new AlternateUnit<ElectricPotential>( |
| 229 | "V", WATT.divide(AMPERE))); |
| 230 | |
| 231 | /** |
| 232 | * The derived unit for capacitance (<code>F</code>). |
| 233 | * One Farad is equal to the capacitance of a capacitor having an equal |
| 234 | * and opposite charge of 1 coulomb on each plate and a potential difference |
| 235 | * of 1 volt between the plates. It is named after the British physicist |
| 236 | * and chemist Michael Faraday (1791-1867). |
| 237 | */ |
| 238 | public static final AlternateUnit<ElectricCapacitance> FARAD = si(new AlternateUnit<ElectricCapacitance>( |
| 239 | "F", COULOMB.divide(VOLT))); |
| 240 | |
| 241 | /** |
| 242 | * The derived unit for electric resistance (<code>Ω</code> or |
| 243 | * <code>Ohm</code>). |
| 244 | * One Ohm is equal to the resistance of a conductor in which a current of |
| 245 | * one ampere is produced by a potential of one volt across its terminals. |
| 246 | * It is named after the German physicist Georg Simon Ohm (1789-1854). |
| 247 | */ |
| 248 | public static final AlternateUnit<ElectricResistance> OHM = si(new AlternateUnit<ElectricResistance>( |
| 249 | "Ω", VOLT.divide(AMPERE))); |
| 250 | |
| 251 | /** |
| 252 | * The derived unit for electric conductance (<code>S</code>). |
| 253 | * One Siemens is equal to one ampere per volt. It is named after |
| 254 | * the German engineer Ernst Werner von Siemens (1816-1892). |
| 255 | */ |
| 256 | public static final AlternateUnit<ElectricConductance> SIEMENS = si(new AlternateUnit<ElectricConductance>( |
| 257 | "S", AMPERE.divide(VOLT))); |
| 258 | |
| 259 | /** |
| 260 | * The derived unit for magnetic flux (<code>Wb</code>). |
| 261 | * One Weber is equal to the magnetic flux that in linking a circuit of one |
| 262 | * turn produces in it an electromotive force of one volt as it is uniformly |
| 263 | * reduced to zero within one second. It is named after the German physicist |
| 264 | * Wilhelm Eduard Weber (1804-1891). |
| 265 | */ |
| 266 | public static final AlternateUnit<MagneticFlux> WEBER = si(new AlternateUnit<MagneticFlux>( |
| 267 | "Wb", VOLT.times(SECOND))); |
| 268 | |
| 269 | /** |
| 270 | * The derived unit for magnetic flux density (<code>T</code>). |
| 271 | * One Tesla is equal equal to one weber per square meter. It is named |
| 272 | * after the Serbian-born American electrical engineer and physicist |
| 273 | * Nikola Tesla (1856-1943). |
| 274 | */ |
| 275 | public static final AlternateUnit<MagneticFluxDensity> TESLA = si(new AlternateUnit<MagneticFluxDensity>( |
| 276 | "T", WEBER.divide(METRE.pow(2)))); |
| 277 | |
| 278 | /** |
| 279 | * The derived unit for inductance (<code>H</code>). |
| 280 | * One Henry is equal to the inductance for which an induced electromotive |
| 281 | * force of one volt is produced when the current is varied at the rate of |
| 282 | * one ampere per second. It is named after the American physicist |
| 283 | * Joseph Henry (1791-1878). |
| 284 | */ |
| 285 | public static final AlternateUnit<ElectricInductance> HENRY = si(new AlternateUnit<ElectricInductance>( |
| 286 | "H", WEBER.divide(AMPERE))); |
| 287 | |
| 288 | /** |
| 289 | * The derived unit for Celsius temperature (<code>℃</code>). |
| 290 | * This is a unit of temperature such as the freezing point of water |
| 291 | * (at one atmosphere of pressure) is 0 ℃, while the boiling point is |
| 292 | * 100 ℃. |
| 293 | */ |
| 294 | public static final Unit<Temperature> CELSIUS = si(KELVIN.plus(273.15)); |
| 295 | |
| 296 | /** |
| 297 | * The derived unit for luminous flux (<code>lm</code>). |
| 298 | * One Lumen is equal to the amount of light given out through a solid angle |
| 299 | * by a source of one candela intensity radiating equally in all directions. |
| 300 | */ |
| 301 | public static final AlternateUnit<LuminousFlux> LUMEN = si(new AlternateUnit<LuminousFlux>( |
| 302 | "lm", CANDELA.times(STERADIAN))); |
| 303 | |
| 304 | /** |
| 305 | * The derived unit for illuminance (<code>lx</code>). |
| 306 | * One Lux is equal to one lumen per square meter. |
| 307 | */ |
| 308 | public static final AlternateUnit<Illuminance> LUX = si(new AlternateUnit<Illuminance>( |
| 309 | "lx", LUMEN.divide(METRE.pow(2)))); |
| 310 | |
| 311 | /** |
| 312 | * The derived unit for activity of a radionuclide (<code>Bq</code>). |
| 313 | * One becquerel is the radiation caused by one disintegration per second. |
| 314 | * It is named after the French physicist, Antoine-Henri Becquerel |
| 315 | * (1852-1908). |
| 316 | */ |
| 317 | public static final AlternateUnit<RadioactiveActivity> BECQUEREL = si(new AlternateUnit<RadioactiveActivity>( |
| 318 | "Bq", Unit.ONE.divide(SECOND))); |
| 319 | |
| 320 | /** |
| 321 | * The derived unit for absorbed dose, specific energy (imparted), kerma |
| 322 | * (<code>Gy</code>). |
| 323 | * One gray is equal to the dose of one joule of energy absorbed per one |
| 324 | * kilogram of matter. It is named after the British physician |
| 325 | * L. H. Gray (1905-1965). |
| 326 | */ |
| 327 | public static final AlternateUnit<RadiationDoseAbsorbed> GRAY = si(new AlternateUnit<RadiationDoseAbsorbed>( |
| 328 | "Gy", JOULE.divide(KILOGRAM))); |
| 329 | |
| 330 | /** |
| 331 | * The derived unit for dose equivalent (<code>Sv</code>). |
| 332 | * One Sievert is equal is equal to the actual dose, in grays, multiplied |
| 333 | * by a "quality factor" which is larger for more dangerous forms of |
| 334 | * radiation. It is named after the Swedish physicist Rolf Sievert |
| 335 | * (1898-1966). |
| 336 | */ |
| 337 | public static final AlternateUnit<RadiationDoseEffective> SIEVERT = si(new AlternateUnit<RadiationDoseEffective>( |
| 338 | "Sv", JOULE.divide(KILOGRAM))); |
| 339 | |
| 340 | /** |
| 341 | * The derived unit for catalytic activity (<code>kat</code>). |
| 342 | */ |
| 343 | public static final AlternateUnit<CatalyticActivity> KATAL = si(new AlternateUnit<CatalyticActivity>( |
| 344 | "kat", MOLE.divide(SECOND))); |
| 345 | |
| 346 | ////////////////////////////// |
| 347 | // SI DERIVED PRODUCT UNITS // |
| 348 | ////////////////////////////// |
| 349 | |
| 350 | /** |
| 351 | * The metric unit for velocity quantities (<code>m/s</code>). |
| 352 | */ |
| 353 | public static final Unit<Velocity> METRES_PER_SECOND = si(new ProductUnit<Velocity>( |
| 354 | METRE.divide(SECOND))); |
| 355 | |
| 356 | /** |
| 357 | * Equivalent to {@link #METRES_PER_SECOND}. |
| 358 | */ |
| 359 | public static final Unit<Velocity> METERS_PER_SECOND = METRES_PER_SECOND; |
| 360 | |
| 361 | /** |
| 362 | * The metric unit for acceleration quantities (<code>m/s²</code>). |
| 363 | */ |
| 364 | public static final Unit<Acceleration> METRES_PER_SQUARE_SECOND = si(new ProductUnit<Acceleration>( |
| 365 | METRES_PER_SECOND.divide(SECOND))); |
| 366 | |
| 367 | /** |
| 368 | * Equivalent to {@link #METRES_PER_SQUARE_SECOND}. |
| 369 | */ |
| 370 | public static final Unit<Acceleration> METERS_PER_SQUARE_SECOND = METRES_PER_SQUARE_SECOND; |
| 371 | |
| 372 | /** |
| 373 | * The metric unit for area quantities (<code>m²</code>). |
| 374 | */ |
| 375 | public static final Unit<Area> SQUARE_METRE = si(new ProductUnit<Area>( |
| 376 | METRE.times(METRE))); |
| 377 | |
| 378 | /** |
| 379 | * The metric unit for volume quantities (<code>m³</code>). |
| 380 | */ |
| 381 | public static final Unit<Volume> CUBIC_METRE = si(new ProductUnit<Volume>( |
| 382 | SQUARE_METRE.times(METRE))); |
| 383 | |
| 384 | /** |
| 385 | * Equivalent to <code>KILO(METRE)</code>. |
| 386 | */ |
| 387 | public static final Unit<Length> KILOMETRE = METER.times(1000); |
| 388 | |
| 389 | /** |
| 390 | * Equivalent to {@link #KILOMETRE}. |
| 391 | */ |
| 392 | public static final Unit<Length> KILOMETER = KILOMETRE; |
| 393 | |
| 394 | /** |
| 395 | * Equivalent to <code>CENTI(METRE)</code>. |
| 396 | */ |
| 397 | public static final Unit<Length> CENTIMETRE = METRE.divide(100); |
| 398 | |
| 399 | /** |
| 400 | * Equivalent to {@link #CENTIMETRE}. |
| 401 | */ |
| 402 | public static final Unit<Length> CENTIMETER = CENTIMETRE; |
| 403 | |
| 404 | /** |
| 405 | * Equivalent to <code>MILLI(METRE)</code>. |
| 406 | */ |
| 407 | public static final Unit<Length> MILLIMETRE = METRE.divide(1000); |
| 408 | |
| 409 | /** |
| 410 | * Equivalent to {@link #MILLIMETRE}. |
| 411 | */ |
| 412 | public static final Unit<Length> MILLIMETER = MILLIMETRE; |
| 413 | |
| 414 | ///////////////// |
| 415 | // SI PREFIXES // |
| 416 | ///////////////// |
| 417 | |
| 418 | /** |
| 419 | * Returns the specified unit multiplied by the factor |
| 420 | * <code>10<sup>24</sup></code> |
| 421 | * |
| 422 | * @param unit any unit. |
| 423 | * @return <code>unit.multiply(1e24)</code>. |
| 424 | */ |
| 425 | public static <Q extends Quantity> Unit<Q> YOTTA(Unit<Q> unit) { |
| 426 | return unit.transform(E24); |
| 427 | } |
| 428 | |
| 429 | /** |
| 430 | * Returns the specified unit multiplied by the factor |
| 431 | * <code>10<sup>21</sup></code> |
| 432 | * |
| 433 | * @param unit any unit. |
| 434 | * @return <code>unit.multiply(1e21)</code>. |
| 435 | */ |
| 436 | public static <Q extends Quantity> Unit<Q> ZETTA(Unit<Q> unit) { |
| 437 | return unit.transform(E21); |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Returns the specified unit multiplied by the factor |
| 442 | * <code>10<sup>18</sup></code> |
| 443 | * |
| 444 | * @param unit any unit. |
| 445 | * @return <code>unit.multiply(1e18)</code>. |
| 446 | */ |
| 447 | public static <Q extends Quantity> Unit<Q> EXA(Unit<Q> unit) { |
| 448 | return unit.transform(E18); |
| 449 | } |
| 450 | |
| 451 | /** |
| 452 | * Returns the specified unit multiplied by the factor |
| 453 | * <code>10<sup>15</sup></code> |
| 454 | * |
| 455 | * @param unit any unit. |
| 456 | * @return <code>unit.multiply(1e15)</code>. |
| 457 | */ |
| 458 | public static <Q extends Quantity> Unit<Q> PETA(Unit<Q> unit) { |
| 459 | return unit.transform(E15); |
| 460 | } |
| 461 | |
| 462 | /** |
| 463 | * Returns the specified unit multiplied by the factor |
| 464 | * <code>10<sup>12</sup></code> |
| 465 | * |
| 466 | * @param unit any unit. |
| 467 | * @return <code>unit.multiply(1e12)</code>. |
| 468 | */ |
| 469 | public static <Q extends Quantity> Unit<Q> TERA(Unit<Q> unit) { |
| 470 | return unit.transform(E12); |
| 471 | } |
| 472 | |
| 473 | /** |
| 474 | * Returns the specified unit multiplied by the factor |
| 475 | * <code>10<sup>9</sup></code> |
| 476 | * |
| 477 | * @param unit any unit. |
| 478 | * @return <code>unit.multiply(1e9)</code>. |
| 479 | */ |
| 480 | public static <Q extends Quantity> Unit<Q> GIGA(Unit<Q> unit) { |
| 481 | return unit.transform(E9); |
| 482 | } |
| 483 | |
| 484 | /** |
| 485 | * Returns the specified unit multiplied by the factor |
| 486 | * <code>10<sup>6</sup></code> |
| 487 | * |
| 488 | * @param unit any unit. |
| 489 | * @return <code>unit.multiply(1e6)</code>. |
| 490 | */ |
| 491 | public static <Q extends Quantity> Unit<Q> MEGA(Unit<Q> unit) { |
| 492 | return unit.transform(E6); |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * Returns the specified unit multiplied by the factor |
| 497 | * <code>10<sup>3</sup></code> |
| 498 | * |
| 499 | * @param unit any unit. |
| 500 | * @return <code>unit.multiply(1e3)</code>. |
| 501 | */ |
| 502 | public static <Q extends Quantity> Unit<Q> KILO(Unit<Q> unit) { |
| 503 | return unit.transform(E3); |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * Returns the specified unit multiplied by the factor |
| 508 | * <code>10<sup>2</sup></code> |
| 509 | * |
| 510 | * @param unit any unit. |
| 511 | * @return <code>unit.multiply(1e2)</code>. |
| 512 | */ |
| 513 | public static <Q extends Quantity> Unit<Q> HECTO(Unit<Q> unit) { |
| 514 | return unit.transform(E2); |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * Returns the specified unit multiplied by the factor |
| 519 | * <code>10<sup>1</sup></code> |
| 520 | * |
| 521 | * @param unit any unit. |
| 522 | * @return <code>unit.multiply(1e1)</code>. |
| 523 | */ |
| 524 | public static <Q extends Quantity> Unit<Q> DEKA(Unit<Q> unit) { |
| 525 | return unit.transform(E1); |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * Returns the specified unit multiplied by the factor |
| 530 | * <code>10<sup>-1</sup></code> |
| 531 | * |
| 532 | * @param unit any unit. |
| 533 | * @return <code>unit.multiply(1e-1)</code>. |
| 534 | */ |
| 535 | public static <Q extends Quantity> Unit<Q> DECI(Unit<Q> unit) { |
| 536 | return unit.transform(Em1); |
| 537 | } |
| 538 | |
| 539 | /** |
| 540 | * Returns the specified unit multiplied by the factor |
| 541 | * <code>10<sup>-2</sup></code> |
| 542 | * |
| 543 | * @param unit any unit. |
| 544 | * @return <code>unit.multiply(1e-2)</code>. |
| 545 | */ |
| 546 | public static <Q extends Quantity> Unit<Q> CENTI(Unit<Q> unit) { |
| 547 | return unit.transform(Em2); |
| 548 | } |
| 549 | |
| 550 | /** |
| 551 | * Returns the specified unit multiplied by the factor |
| 552 | * <code>10<sup>-3</sup></code> |
| 553 | * |
| 554 | * @param unit any unit. |
| 555 | * @return <code>unit.multiply(1e-3)</code>. |
| 556 | */ |
| 557 | public static <Q extends Quantity> Unit<Q> MILLI(Unit<Q> unit) { |
| 558 | return unit.transform(Em3); |
| 559 | } |
| 560 | |
| 561 | /** |
| 562 | * Returns the specified unit multiplied by the factor |
| 563 | * <code>10<sup>-6</sup></code> |
| 564 | * |
| 565 | * @param unit any unit. |
| 566 | * @return <code>unit.multiply(1e-6)</code>. |
| 567 | */ |
| 568 | public static <Q extends Quantity> Unit<Q> MICRO(Unit<Q> unit) { |
| 569 | return unit.transform(Em6); |
| 570 | } |
| 571 | |
| 572 | /** |
| 573 | * Returns the specified unit multiplied by the factor |
| 574 | * <code>10<sup>-9</sup></code> |
| 575 | * |
| 576 | * @param unit any unit. |
| 577 | * @return <code>unit.multiply(1e-9)</code>. |
| 578 | */ |
| 579 | public static <Q extends Quantity> Unit<Q> NANO(Unit<Q> unit) { |
| 580 | return unit.transform(Em9); |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | * Returns the specified unit multiplied by the factor |
| 585 | * <code>10<sup>-12</sup></code> |
| 586 | * |
| 587 | * @param unit any unit. |
| 588 | * @return <code>unit.multiply(1e-12)</code>. |
| 589 | */ |
| 590 | public static <Q extends Quantity> Unit<Q> PICO(Unit<Q> unit) { |
| 591 | return unit.transform(Em12); |
| 592 | } |
| 593 | |
| 594 | /** |
| 595 | * Returns the specified unit multiplied by the factor |
| 596 | * <code>10<sup>-15</sup></code> |
| 597 | * |
| 598 | * @param unit any unit. |
| 599 | * @return <code>unit.multiply(1e-15)</code>. |
| 600 | */ |
| 601 | public static <Q extends Quantity> Unit<Q> FEMTO(Unit<Q> unit) { |
| 602 | return unit.transform(Em15); |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * Returns the specified unit multiplied by the factor |
| 607 | * <code>10<sup>-18</sup></code> |
| 608 | * |
| 609 | * @param unit any unit. |
| 610 | * @return <code>unit.multiply(1e-18)</code>. |
| 611 | */ |
| 612 | public static <Q extends Quantity> Unit<Q> ATTO(Unit<Q> unit) { |
| 613 | return unit.transform(Em18); |
| 614 | } |
| 615 | |
| 616 | /** |
| 617 | * Returns the specified unit multiplied by the factor |
| 618 | * <code>10<sup>-21</sup></code> |
| 619 | * |
| 620 | * @param unit any unit. |
| 621 | * @return <code>unit.multiply(1e-21)</code>. |
| 622 | */ |
| 623 | public static <Q extends Quantity> Unit<Q> ZEPTO(Unit<Q> unit) { |
| 624 | return unit.transform(Em21); |
| 625 | } |
| 626 | |
| 627 | /** |
| 628 | * Returns the specified unit multiplied by the factor |
| 629 | * <code>10<sup>-24</sup></code> |
| 630 | * |
| 631 | * @param unit any unit. |
| 632 | * @return <code>unit.multiply(1e-24)</code>. |
| 633 | */ |
| 634 | public static <Q extends Quantity> Unit<Q> YOCTO(Unit<Q> unit) { |
| 635 | return unit.transform(Em24); |
| 636 | } |
| 637 | |
| 638 | ///////////////////// |
| 639 | // Collection View // |
| 640 | ///////////////////// |
| 641 | |
| 642 | /** |
| 643 | * Returns a read only view over theunits defined in this class. |
| 644 | * |
| 645 | * @return the collection of SI units. |
| 646 | */ |
| 647 | public Set<Unit<?>> getUnits() { |
| 648 | return Collections.unmodifiableSet(UNITS); |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * Adds a new unit to the collection. |
| 653 | * |
| 654 | * @param unit the unit being added. |
| 655 | * @return <code>unit</code>. |
| 656 | */ |
| 657 | private static <U extends Unit<?>> U si(U unit) { |
| 658 | UNITS.add(unit); |
| 659 | return unit; |
| 660 | } |
| 661 | |
| 662 | // Holds prefix converters (optimization). |
| 663 | |
| 664 | static final MultiplyConverter E24 = new MultiplyConverter(1E24); |
| 665 | |
| 666 | static final MultiplyConverter E21 = new MultiplyConverter(1E21); |
| 667 | |
| 668 | static final RationalConverter E18 = new RationalConverter( |
| 669 | 1000000000000000000L, 1); |
| 670 | |
| 671 | static final RationalConverter E15 = new RationalConverter( |
| 672 | 1000000000000000L, 1); |
| 673 | |
| 674 | static final RationalConverter E12 = new RationalConverter(1000000000000L, |
| 675 | 1); |
| 676 | |
| 677 | static final RationalConverter E9 = new RationalConverter(1000000000L, 1); |
| 678 | |
| 679 | static final RationalConverter E6 = new RationalConverter(1000000L, 1); |
| 680 | |
| 681 | static final RationalConverter E3 = new RationalConverter(1000L, 1); |
| 682 | |
| 683 | static final RationalConverter E2 = new RationalConverter(100L, 1); |
| 684 | |
| 685 | static final RationalConverter E1 = new RationalConverter(10L, 1); |
| 686 | |
| 687 | static final RationalConverter Em1 = new RationalConverter(1, 10L); |
| 688 | |
| 689 | static final RationalConverter Em2 = new RationalConverter(1, 100L); |
| 690 | |
| 691 | static final RationalConverter Em3 = new RationalConverter(1, 1000L); |
| 692 | |
| 693 | static final RationalConverter Em6 = new RationalConverter(1, 1000000L); |
| 694 | |
| 695 | static final RationalConverter Em9 = new RationalConverter(1, 1000000000L); |
| 696 | |
| 697 | static final RationalConverter Em12 = new RationalConverter(1, |
| 698 | 1000000000000L); |
| 699 | |
| 700 | static final RationalConverter Em15 = new RationalConverter(1, |
| 701 | 1000000000000000L); |
| 702 | |
| 703 | static final RationalConverter Em18 = new RationalConverter(1, |
| 704 | 1000000000000000000L); |
| 705 | |
| 706 | static final MultiplyConverter Em21 = new MultiplyConverter(1E-21); |
| 707 | |
| 708 | static final MultiplyConverter Em24 = new MultiplyConverter(1E-24); |
| 709 | |
| 710 | /** |
| 711 | * @deprecated replaced by {@link #METRES_PER_SECOND}. |
| 712 | */ |
| 713 | public static final Unit<Velocity> METRE_PER_SECOND = METRES_PER_SECOND; |
| 714 | |
| 715 | /** |
| 716 | * @deprecated replaced by {@link #METRES_PER_SQUARE_SECOND}. |
| 717 | */ |
| 718 | public static final Unit<Acceleration> METRE_PER_SQUARE_SECOND = METRES_PER_SQUARE_SECOND; |
| 719 | } |