git.gag.com Git - debian/openrocket/blob - src/net/sf/openrocket/unit/UnitGroup.java

   1 package net.sf.openrocket.unit;
   2
   3 import static net.sf.openrocket.util.Chars.*;
   4 import static net.sf.openrocket.util.MathUtil.pow2;
   5
   6 import java.util.ArrayList;
   7 import java.util.Collections;
   8 import java.util.HashMap;
   9 import java.util.Map;
  10 import java.util.regex.Matcher;
  11 import java.util.regex.Pattern;
  12
  13 import net.sf.openrocket.rocketcomponent.Configuration;
  14 import net.sf.openrocket.rocketcomponent.Rocket;
  15
  16
  17 /**
  18  * A group of units (eg. length, mass etc.).  Contains a list of different units of a same
  19  * quantity.
  20  *
  21  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  22  */
  23
  24 public class UnitGroup {
  25
  26         public static final UnitGroup UNITS_NONE;
  27
  28         public static final UnitGroup UNITS_MOTOR_DIMENSIONS;
  29         public static final UnitGroup UNITS_LENGTH;
  30         public static final UnitGroup UNITS_DISTANCE;
  31
  32         public static final UnitGroup UNITS_AREA;
  33         public static final UnitGroup UNITS_STABILITY;
  34         /**
  35          * This unit group contains only the caliber unit that never scales the originating "SI" value.
  36          * It can be used in cases where the originating value is already in calibers to obtains the correct unit.
  37          */
  38         public static final UnitGroup UNITS_STABILITY_CALIBERS;
  39         public static final UnitGroup UNITS_VELOCITY;
  40         public static final UnitGroup UNITS_ACCELERATION;
  41         public static final UnitGroup UNITS_MASS;
  42         public static final UnitGroup UNITS_INERTIA;
  43         public static final UnitGroup UNITS_ANGLE;
  44         public static final UnitGroup UNITS_DENSITY_BULK;
  45         public static final UnitGroup UNITS_DENSITY_SURFACE;
  46         public static final UnitGroup UNITS_DENSITY_LINE;
  47         public static final UnitGroup UNITS_FORCE;
  48         public static final UnitGroup UNITS_IMPULSE;
  49
  50         /** Time in the order of less than a second (time step etc). */
  51         public static final UnitGroup UNITS_TIME_STEP;
  52
  53         /** Time in the order of seconds (motor delay etc). */
  54         public static final UnitGroup UNITS_SHORT_TIME;
  55
  56         /** Time in the order of the flight time of a rocket. */
  57         public static final UnitGroup UNITS_FLIGHT_TIME;
  58         public static final UnitGroup UNITS_ROLL;
  59         public static final UnitGroup UNITS_TEMPERATURE;
  60         public static final UnitGroup UNITS_PRESSURE;
  61         public static final UnitGroup UNITS_RELATIVE;
  62         public static final UnitGroup UNITS_ROUGHNESS;
  63
  64         public static final UnitGroup UNITS_COEFFICIENT;
  65
  66         //      public static final UnitGroup UNITS_FREQUENCY;
  67
  68
  69         public static final Map<String, UnitGroup> UNITS;
  70
  71
  72         /*
  73          * Note:  Units may not use HTML tags.
  74          *
  75          * The scaling value "X" is obtained by "one of this unit is X of SI units"
  76          * Type into Google for example:  "1 in^2 in m^2"
  77          */
  78         static {
  79                 UNITS_NONE = new UnitGroup();
  80                 UNITS_NONE.addUnit(Unit.NOUNIT2);
  81
  82                 UNITS_LENGTH = new UnitGroup();
  83                 UNITS_LENGTH.addUnit(new GeneralUnit(0.001, "mm"));
  84                 UNITS_LENGTH.addUnit(new GeneralUnit(0.01, "cm"));
  85                 UNITS_LENGTH.addUnit(new GeneralUnit(1, "m"));
  86                 UNITS_LENGTH.addUnit(new GeneralUnit(0.0254, "in"));
  87                 UNITS_LENGTH.addUnit(new GeneralUnit(0.3048, "ft"));
  88                 UNITS_LENGTH.setDefaultUnit(1);
  89
  90                 UNITS_MOTOR_DIMENSIONS = new UnitGroup();
  91                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.001, "mm"));
  92                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.01, "cm"));
  93                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.0254, "in"));
  94                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit(0);
  95
  96                 UNITS_DISTANCE = new UnitGroup();
  97                 UNITS_DISTANCE.addUnit(new GeneralUnit(1, "m"));
  98                 UNITS_DISTANCE.addUnit(new GeneralUnit(1000, "km"));
  99                 UNITS_DISTANCE.addUnit(new GeneralUnit(0.3048, "ft"));
 100                 UNITS_DISTANCE.addUnit(new GeneralUnit(0.9144, "yd"));
 101                 UNITS_DISTANCE.addUnit(new GeneralUnit(1609.344, "mi"));
 102
 103                 UNITS_AREA = new UnitGroup();
 104                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.001), "mm" + SQUARED));
 105                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.01), "cm" + SQUARED));
 106                 UNITS_AREA.addUnit(new GeneralUnit(1, "m" + SQUARED));
 107                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.0254), "in" + SQUARED));
 108                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.3048), "ft" + SQUARED));
 109                 UNITS_AREA.setDefaultUnit(1);
 110
 111
 112                 UNITS_STABILITY = new UnitGroup();
 113                 UNITS_STABILITY.addUnit(new GeneralUnit(0.001, "mm"));
 114                 UNITS_STABILITY.addUnit(new GeneralUnit(0.01, "cm"));
 115                 UNITS_STABILITY.addUnit(new GeneralUnit(0.0254, "in"));
 116                 UNITS_STABILITY.addUnit(new CaliberUnit((Rocket) null));
 117                 UNITS_STABILITY.setDefaultUnit(3);
 118
 119                 UNITS_STABILITY_CALIBERS = new UnitGroup();
 120                 UNITS_STABILITY_CALIBERS.addUnit(new GeneralUnit(1, "cal"));
 121
 122
 123                 UNITS_VELOCITY = new UnitGroup();
 124                 UNITS_VELOCITY.addUnit(new GeneralUnit(1, "m/s"));
 125                 UNITS_VELOCITY.addUnit(new GeneralUnit(1 / 3.6, "km/h"));
 126                 UNITS_VELOCITY.addUnit(new GeneralUnit(0.3048, "ft/s"));
 127                 UNITS_VELOCITY.addUnit(new GeneralUnit(0.44704, "mph"));
 128
 129                 UNITS_ACCELERATION = new UnitGroup();
 130                 UNITS_ACCELERATION.addUnit(new GeneralUnit(1, "m/s" + SQUARED));
 131                 UNITS_ACCELERATION.addUnit(new GeneralUnit(0.3048, "ft/s" + SQUARED));
 132
 133                 UNITS_MASS = new UnitGroup();
 134                 UNITS_MASS.addUnit(new GeneralUnit(0.001, "g"));
 135                 UNITS_MASS.addUnit(new GeneralUnit(1, "kg"));
 136                 UNITS_MASS.addUnit(new GeneralUnit(0.0283495231, "oz"));
 137                 UNITS_MASS.addUnit(new GeneralUnit(0.45359237, "lb"));
 138
 139                 UNITS_INERTIA = new UnitGroup();
 140                 UNITS_INERTIA.addUnit(new GeneralUnit(0.0001, "kg" + DOT + "cm" + SQUARED));
 141                 UNITS_INERTIA.addUnit(new GeneralUnit(1, "kg" + DOT + "m" + SQUARED));
 142                 UNITS_INERTIA.addUnit(new GeneralUnit(1.82899783e-5, "oz" + DOT + "in" + SQUARED));
 143                 UNITS_INERTIA.addUnit(new GeneralUnit(0.000292639653, "lb" + DOT + "in" + SQUARED));
 144                 UNITS_INERTIA.addUnit(new GeneralUnit(0.0421401101, "lb" + DOT + "ft" + SQUARED));
 145                 UNITS_INERTIA.addUnit(new GeneralUnit(1.35581795, "lbf" + DOT + "ft" + DOT + "s" + SQUARED));
 146                 UNITS_INERTIA.setDefaultUnit(1);
 147
 148                 UNITS_ANGLE = new UnitGroup();
 149                 UNITS_ANGLE.addUnit(new DegreeUnit());
 150                 UNITS_ANGLE.addUnit(new FixedPrecisionUnit("rad", 0.01));
 151
 152                 UNITS_DENSITY_BULK = new UnitGroup();
 153                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1000, "g/cm" + CUBED));
 154                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1, "kg/m" + CUBED));
 155                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1729.99404, "oz/in" + CUBED));
 156                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(16.0184634, "lb/ft" + CUBED));
 157
 158                 UNITS_DENSITY_SURFACE = new UnitGroup();
 159                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(10, "g/cm" + SQUARED));
 160                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(0.001, "g/m" + SQUARED));
 161                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(1, "kg/m" + SQUARED));
 162                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(43.9418487, "oz/in" + SQUARED));
 163                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(0.305151727, "oz/ft" + SQUARED));
 164                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(4.88242764, "lb/ft" + SQUARED));
 165                 UNITS_DENSITY_SURFACE.setDefaultUnit(1);
 166
 167                 UNITS_DENSITY_LINE = new UnitGroup();
 168                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(0.001, "g/m"));
 169                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(1, "kg/m"));
 170                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(0.0930102465, "oz/ft"));
 171
 172                 UNITS_FORCE = new UnitGroup();
 173                 UNITS_FORCE.addUnit(new GeneralUnit(1, "N"));
 174                 UNITS_FORCE.addUnit(new GeneralUnit(4.44822162, "lbf"));
 175                 UNITS_FORCE.addUnit(new GeneralUnit(9.80665, "kgf"));
 176
 177                 UNITS_IMPULSE = new UnitGroup();
 178                 UNITS_IMPULSE.addUnit(new GeneralUnit(1, "Ns"));
 179                 UNITS_IMPULSE.addUnit(new GeneralUnit(4.44822162, "lbf" + DOT + "s"));
 180
 181                 UNITS_TIME_STEP = new UnitGroup();
 182                 UNITS_TIME_STEP.addUnit(new FixedPrecisionUnit("ms", 1, 0.001));
 183                 UNITS_TIME_STEP.addUnit(new FixedPrecisionUnit("s", 0.01));
 184                 UNITS_TIME_STEP.setDefaultUnit(1);
 185
 186                 UNITS_SHORT_TIME = new UnitGroup();
 187                 UNITS_SHORT_TIME.addUnit(new GeneralUnit(1, "s"));
 188
 189                 UNITS_FLIGHT_TIME = new UnitGroup();
 190                 UNITS_FLIGHT_TIME.addUnit(new GeneralUnit(1, "s"));
 191                 UNITS_FLIGHT_TIME.addUnit(new GeneralUnit(60, "min"));
 192
 193                 UNITS_ROLL = new UnitGroup();
 194                 UNITS_ROLL.addUnit(new GeneralUnit(1, "rad/s"));
 195                 UNITS_ROLL.addUnit(new GeneralUnit(2 * Math.PI, "r/s"));
 196                 UNITS_ROLL.addUnit(new GeneralUnit(2 * Math.PI / 60, "rpm"));
 197                 UNITS_ROLL.setDefaultUnit(1);
 198
 199                 UNITS_TEMPERATURE = new UnitGroup();
 200                 UNITS_TEMPERATURE.addUnit(new FixedPrecisionUnit("K", 1));
 201                 UNITS_TEMPERATURE.addUnit(new TemperatureUnit(1, 273.15, DEGREE + "C"));
 202                 UNITS_TEMPERATURE.addUnit(new TemperatureUnit(5.0 / 9.0, 459.67, DEGREE + "F"));
 203                 UNITS_TEMPERATURE.setDefaultUnit(1);
 204
 205                 UNITS_PRESSURE = new UnitGroup();
 206                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("mbar", 1, 1.0e2));
 207                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("bar", 0.001, 1.0e5));
 208                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("atm", 0.001, 1.01325e5));
 209                 UNITS_PRESSURE.addUnit(new GeneralUnit(101325.0 / 760.0, "mmHg"));
 210                 UNITS_PRESSURE.addUnit(new GeneralUnit(3386.389, "inHg"));
 211                 UNITS_PRESSURE.addUnit(new GeneralUnit(6894.75729, "psi"));
 212                 UNITS_PRESSURE.addUnit(new GeneralUnit(1, "Pa"));
 213
 214                 UNITS_RELATIVE = new UnitGroup();
 215                 UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + ZWSP, 0.01, 1.0));
 216                 UNITS_RELATIVE.addUnit(new GeneralUnit(0.01, "%"));
 217                 UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + PERMILLE, 1, 0.001));
 218                 //              UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + ZWSP, 0.01, 1.0));
 219                 //              UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("%", 1, 0.01));
 220                 //              UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + PERMILLE, 1, 0.001));
 221                 UNITS_RELATIVE.setDefaultUnit(1);
 222
 223
 224                 UNITS_ROUGHNESS = new UnitGroup();
 225                 UNITS_ROUGHNESS.addUnit(new GeneralUnit(0.000001, MICRO + "m"));
 226                 UNITS_ROUGHNESS.addUnit(new GeneralUnit(0.0000254, "mil"));
 227
 228
 229                 UNITS_COEFFICIENT = new UnitGroup();
 230                 UNITS_COEFFICIENT.addUnit(new FixedPrecisionUnit("" + ZWSP, 0.01)); // zero-width space
 231
 232
 233                 // This is not used by OpenRocket, and not extensively tested:
 234                 //              UNITS_FREQUENCY = new UnitGroup();
 235                 //              UNITS_FREQUENCY.addUnit(new GeneralUnit(1, "s"));
 236                 //              UNITS_FREQUENCY.addUnit(new GeneralUnit(0.001, "ms"));
 237                 //              UNITS_FREQUENCY.addUnit(new GeneralUnit(0.000001, MICRO + "s"));
 238                 //              UNITS_FREQUENCY.addUnit(new FrequencyUnit(1, "Hz"));
 239                 //              UNITS_FREQUENCY.addUnit(new FrequencyUnit(1000, "kHz"));
 240                 //              UNITS_FREQUENCY.setDefaultUnit(3);
 241
 242
 243                 HashMap<String, UnitGroup> map = new HashMap<String, UnitGroup>();
 244                 map.put("NONE", UNITS_NONE);
 245                 map.put("LENGTH", UNITS_LENGTH);
 246                 map.put("MOTOR_DIMENSIONS", UNITS_MOTOR_DIMENSIONS);
 247                 map.put("DISTANCE", UNITS_DISTANCE);
 248                 map.put("VELOCITY", UNITS_VELOCITY);
 249                 map.put("ACCELERATION", UNITS_ACCELERATION);
 250                 map.put("AREA", UNITS_AREA);
 251                 map.put("STABILITY", UNITS_STABILITY);
 252                 map.put("MASS", UNITS_MASS);
 253                 map.put("INERTIA", UNITS_INERTIA);
 254                 map.put("ANGLE", UNITS_ANGLE);
 255                 map.put("DENSITY_BULK", UNITS_DENSITY_BULK);
 256                 map.put("DENSITY_SURFACE", UNITS_DENSITY_SURFACE);
 257                 map.put("DENSITY_LINE", UNITS_DENSITY_LINE);
 258                 map.put("FORCE", UNITS_FORCE);
 259                 map.put("IMPULSE", UNITS_IMPULSE);
 260                 map.put("TIME_STEP", UNITS_TIME_STEP);
 261                 map.put("SHORT_TIME", UNITS_SHORT_TIME);
 262                 map.put("FLIGHT_TIME", UNITS_FLIGHT_TIME);
 263                 map.put("ROLL", UNITS_ROLL);
 264                 map.put("TEMPERATURE", UNITS_TEMPERATURE);
 265                 map.put("PRESSURE", UNITS_PRESSURE);
 266                 map.put("RELATIVE", UNITS_RELATIVE);
 267                 map.put("ROUGHNESS", UNITS_ROUGHNESS);
 268                 map.put("COEFFICIENT", UNITS_COEFFICIENT);
 269
 270                 UNITS = Collections.unmodifiableMap(map);
 271         }
 272
 273         public static void setDefaultMetricUnits() {
 274                 UNITS_LENGTH.setDefaultUnit("cm");
 275                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit("mm");
 276                 UNITS_DISTANCE.setDefaultUnit("m");
 277                 UNITS_AREA.setDefaultUnit("cm" + SQUARED);
 278                 UNITS_STABILITY.setDefaultUnit("cal");
 279                 UNITS_VELOCITY.setDefaultUnit("m/s");
 280                 UNITS_ACCELERATION.setDefaultUnit("m/s" + SQUARED);
 281                 UNITS_MASS.setDefaultUnit("g");
 282                 UNITS_INERTIA.setDefaultUnit("kg" + DOT + "m" + SQUARED);
 283                 UNITS_ANGLE.setDefaultUnit("" + DEGREE);
 284                 UNITS_DENSITY_BULK.setDefaultUnit("g/cm" + CUBED);
 285                 UNITS_DENSITY_SURFACE.setDefaultUnit("g/m" + SQUARED);
 286                 UNITS_DENSITY_LINE.setDefaultUnit("g/m");
 287                 UNITS_FORCE.setDefaultUnit("N");
 288                 UNITS_IMPULSE.setDefaultUnit("Ns");
 289                 UNITS_TIME_STEP.setDefaultUnit("s");
 290                 UNITS_FLIGHT_TIME.setDefaultUnit("s");
 291                 UNITS_ROLL.setDefaultUnit("r/s");
 292                 UNITS_TEMPERATURE.setDefaultUnit(DEGREE + "C");
 293                 UNITS_PRESSURE.setDefaultUnit("mbar");
 294                 UNITS_RELATIVE.setDefaultUnit("%");
 295                 UNITS_ROUGHNESS.setDefaultUnit(MICRO + "m");
 296         }
 297
 298         public static void setDefaultImperialUnits() {
 299                 UNITS_LENGTH.setDefaultUnit("in");
 300                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit("in");
 301                 UNITS_DISTANCE.setDefaultUnit("ft");
 302                 UNITS_AREA.setDefaultUnit("in" + SQUARED);
 303                 UNITS_STABILITY.setDefaultUnit("cal");
 304                 UNITS_VELOCITY.setDefaultUnit("ft/s");
 305                 UNITS_ACCELERATION.setDefaultUnit("ft/s" + SQUARED);
 306                 UNITS_MASS.setDefaultUnit("oz");
 307                 UNITS_INERTIA.setDefaultUnit("lb" + DOT + "ft" + SQUARED);
 308                 UNITS_ANGLE.setDefaultUnit("" + DEGREE);
 309                 UNITS_DENSITY_BULK.setDefaultUnit("oz/in" + CUBED);
 310                 UNITS_DENSITY_SURFACE.setDefaultUnit("oz/ft" + SQUARED);
 311                 UNITS_DENSITY_LINE.setDefaultUnit("oz/ft");
 312                 UNITS_FORCE.setDefaultUnit("N");
 313                 UNITS_IMPULSE.setDefaultUnit("Ns");
 314                 UNITS_TIME_STEP.setDefaultUnit("s");
 315                 UNITS_FLIGHT_TIME.setDefaultUnit("s");
 316                 UNITS_ROLL.setDefaultUnit("r/s");
 317                 UNITS_TEMPERATURE.setDefaultUnit(DEGREE + "F");
 318                 UNITS_PRESSURE.setDefaultUnit("mbar");
 319                 UNITS_RELATIVE.setDefaultUnit("%");
 320                 UNITS_ROUGHNESS.setDefaultUnit("mil");
 321         }
 322
 323
 324         /**
 325          * Return a UnitGroup for stability units based on the rocket.
 326          *
 327          * @param rocket        the rocket from which to calculate the caliber
 328          * @return                      the unit group
 329          */
 330         public static UnitGroup stabilityUnits(Rocket rocket) {
 331                 return new StabilityUnitGroup(rocket);
 332         }
 333
 334
 335         /**
 336          * Return a UnitGroup for stability units based on the rocket configuration.
 337          *
 338          * @param config        the rocket configuration from which to calculate the caliber
 339          * @return                      the unit group
 340          */
 341         public static UnitGroup stabilityUnits(Configuration config) {
 342                 return new StabilityUnitGroup(config);
 343         }
 344
 345
 346         /**
 347          * Return a UnitGroup for stability units based on a constant caliber.
 348          *
 349          * @param reference     the constant reference length
 350          * @return                      the unit group
 351          */
 352         public static UnitGroup stabilityUnits(double reference) {
 353                 return new StabilityUnitGroup(reference);
 354         }
 355
 356
 357         //////////////////////////////////////////////////////
 358
 359
 360         protected ArrayList<Unit> units = new ArrayList<Unit>();
 361         protected int defaultUnit = 0;
 362
 363         public int getUnitCount() {
 364                 return units.size();
 365         }
 366
 367         public Unit getDefaultUnit() {
 368                 return units.get(defaultUnit);
 369         }
 370
 371         public int getDefaultUnitIndex() {
 372                 return defaultUnit;
 373         }
 374
 375         public void setDefaultUnit(int n) {
 376                 if (n < 0 || n >= units.size()) {
 377                         throw new IllegalArgumentException("index out of range: " + n);
 378                 }
 379                 defaultUnit = n;
 380         }
 381
 382
 383
 384         /**
 385          * Find a unit by approximate unit name.  Only letters and (ordinary) numbers are
 386          * considered in the matching.  This method is mainly means for testing, allowing
 387          * a simple means to obtain a particular unit.
 388          *
 389          * @param str   the unit name.
 390          * @return              the corresponding unit, or <code>null</code> if not found.
 391          */
 392         public Unit findApproximate(String str) {
 393                 str = str.replaceAll("\\W", "").trim();
 394                 for (Unit u : units) {
 395                         String name = u.getUnit().replaceAll("\\W", "").trim();
 396                         if (str.equalsIgnoreCase(name))
 397                                 return u;
 398                 }
 399                 return null;
 400         }
 401
 402         /**
 403          * Set the default unit based on the unit name.  Throws an exception if a
 404          * unit with the provided name is not available.
 405          *
 406          * @param   name        the unit name.
 407          * @throws  IllegalArgumentException    if the corresponding unit is not found in the group.
 408          */
 409         public void setDefaultUnit(String name) throws IllegalArgumentException {
 410                 for (int i = 0; i < units.size(); i++) {
 411                         if (units.get(i).getUnit().equals(name)) {
 412                                 setDefaultUnit(i);
 413                                 return;
 414                         }
 415                 }
 416                 throw new IllegalArgumentException("name=" + name);
 417         }
 418
 419
 420         public Unit getUnit(int n) {
 421                 return units.get(n);
 422         }
 423
 424         public int getUnitIndex(Unit u) {
 425                 return units.indexOf(u);
 426         }
 427
 428         private void addUnit(Unit u) {
 429                 units.add(u);
 430         }
 431
 432         public boolean contains(Unit u) {
 433                 return units.contains(u);
 434         }
 435
 436         public Unit[] getUnits() {
 437                 return units.toArray(new Unit[0]);
 438         }
 439
 440
 441         /**
 442          * Return the value formatted by the default unit of this group.
 443          * It is the same as calling <code>getDefaultUnit().toString(value)</code>.
 444          *
 445          * @param value         the SI value to format.
 446          * @return                      the formatted string.
 447          * @see                         Unit#toString(double)
 448          */
 449         public String toString(double value) {
 450                 return this.getDefaultUnit().toString(value);
 451         }
 452
 453
 454         /**
 455          * Return the value formatted by the default unit of this group including the unit.
 456          * It is the same as calling <code>getDefaultUnit().toStringUnit(value)</code>.
 457          *
 458          * @param value         the SI value to format.
 459          * @return                      the formatted string.
 460          * @see                         Unit#toStringUnit(double)
 461          */
 462         public String toStringUnit(double value) {
 463                 return this.getDefaultUnit().toStringUnit(value);
 464         }
 465
 466
 467
 468
 469
 470         /**
 471          * Creates a new Value object with the specified value and the default unit of this group.
 472          *
 473          * @param value the value to set.
 474          * @return              a new Value object.
 475          */
 476         public Value toValue(double value) {
 477                 return this.getDefaultUnit().toValue(value);
 478         }
 479
 480
 481
 482
 483         private static final Pattern STRING_PATTERN = Pattern.compile("^\\s*([0-9.,-]+)(.*?)$");
 484
 485         /**
 486          * Converts a string into an SI value.  If the string has one of the units in this
 487          * group appended to it, that unit will be used in conversion.  Otherwise the default
 488          * unit will be used.  If an unknown unit is specified or the value does not parse
 489          * with <code>Double.parseDouble</code> then a <code>NumberFormatException</code>
 490          * is thrown.
 491          * <p>
 492          * This method is applicable only for simple units without e.g. powers.
 493          *
 494          * @param str   the string to parse.
 495          * @return              the SI value.
 496          * @throws NumberFormatException   if the string cannot be parsed.
 497          */
 498         public double fromString(String str) {
 499                 Matcher matcher = STRING_PATTERN.matcher(str);
 500
 501                 if (!matcher.matches()) {
 502                         throw new NumberFormatException("string did not match required pattern");
 503                 }
 504
 505                 double value = Double.parseDouble(matcher.group(1));
 506                 String unit = matcher.group(2).trim();
 507
 508                 if (unit.equals("")) {
 509                         value = this.getDefaultUnit().fromUnit(value);
 510                 } else {
 511                         int i;
 512                         for (i = 0; i < units.size(); i++) {
 513                                 Unit u = units.get(i);
 514                                 if (unit.equalsIgnoreCase(u.getUnit())) {
 515                                         value = u.fromUnit(value);
 516                                         break;
 517                                 }
 518                         }
 519                         if (i >= units.size()) {
 520                                 throw new NumberFormatException("unknown unit " + unit);
 521                         }
 522                 }
 523
 524                 return value;
 525         }
 526
 527
 528         ///////////////////////////
 529
 530
 531         /**
 532          * A private class that switches the CaliberUnit to a rocket-specific CaliberUnit.
 533          * All other methods are passed through to UNITS_STABILITY.
 534          */
 535         private static class StabilityUnitGroup extends UnitGroup {
 536
 537                 public StabilityUnitGroup(double ref) {
 538                         this(new CaliberUnit(ref));
 539                 }
 540
 541                 public StabilityUnitGroup(Rocket rocket) {
 542                         this(new CaliberUnit(rocket));
 543                 }
 544
 545                 public StabilityUnitGroup(Configuration config) {
 546                         this(new CaliberUnit(config));
 547                 }
 548
 549                 private StabilityUnitGroup(CaliberUnit caliberUnit) {
 550                         this.units.addAll(UnitGroup.UNITS_STABILITY.units);
 551                         this.defaultUnit = UnitGroup.UNITS_STABILITY.defaultUnit;
 552                         for (int i = 0; i < units.size(); i++) {
 553                                 if (units.get(i) instanceof CaliberUnit) {
 554                                         units.set(i, caliberUnit);
 555                                 }
 556                         }
 557                 }
 558
 559
 560                 @Override
 561                 public void setDefaultUnit(int n) {
 562                         super.setDefaultUnit(n);
 563                         UNITS_STABILITY.setDefaultUnit(n);
 564                 }
 565         }
 566 }