git.gag.com Git - debian/openrocket/blob - core/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_WINDSPEED;
  41         public static final UnitGroup UNITS_ACCELERATION;
  42         public static final UnitGroup UNITS_MASS;
  43         public static final UnitGroup UNITS_INERTIA;
  44         public static final UnitGroup UNITS_ANGLE;
  45         public static final UnitGroup UNITS_DENSITY_BULK;
  46         public static final UnitGroup UNITS_DENSITY_SURFACE;
  47         public static final UnitGroup UNITS_DENSITY_LINE;
  48         public static final UnitGroup UNITS_FORCE;
  49         public static final UnitGroup UNITS_IMPULSE;
  50
  51         /** Time in the order of less than a second (time step etc). */
  52         public static final UnitGroup UNITS_TIME_STEP;
  53
  54         /** Time in the order of seconds (motor delay etc). */
  55         public static final UnitGroup UNITS_SHORT_TIME;
  56
  57         /** Time in the order of the flight time of a rocket. */
  58         public static final UnitGroup UNITS_FLIGHT_TIME;
  59         public static final UnitGroup UNITS_ROLL;
  60         public static final UnitGroup UNITS_TEMPERATURE;
  61         public static final UnitGroup UNITS_PRESSURE;
  62         public static final UnitGroup UNITS_RELATIVE;
  63         public static final UnitGroup UNITS_ROUGHNESS;
  64
  65         public static final UnitGroup UNITS_COEFFICIENT;
  66
  67         //      public static final UnitGroup UNITS_FREQUENCY;
  68
  69
  70         public static final Map<String, UnitGroup> UNITS;
  71
  72
  73         /*
  74          * Note:  Units may not use HTML tags.
  75          *
  76          * The scaling value "X" is obtained by "one of this unit is X of SI units"
  77          * Type into Google for example:  "1 in^2 in m^2"
  78          */
  79         static {
  80                 UNITS_NONE = new UnitGroup();
  81                 UNITS_NONE.addUnit(Unit.NOUNIT2);
  82
  83                 UNITS_LENGTH = new UnitGroup();
  84                 UNITS_LENGTH.addUnit(new GeneralUnit(0.001, "mm"));
  85                 UNITS_LENGTH.addUnit(new GeneralUnit(0.01, "cm"));
  86                 UNITS_LENGTH.addUnit(new GeneralUnit(1, "m"));
  87                 UNITS_LENGTH.addUnit(new GeneralUnit(0.0254, "in"));
  88                 UNITS_LENGTH.addUnit(new FractionalUnit(0.0254, "in/64", "in", 64, 1d/16d, 0.5d/64d));
  89                 UNITS_LENGTH.addUnit(new GeneralUnit(0.3048, "ft"));
  90                 UNITS_LENGTH.setDefaultUnit(1);
  91
  92                 UNITS_MOTOR_DIMENSIONS = new UnitGroup();
  93                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.001, "mm"));
  94                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.01, "cm"));
  95                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.0254, "in"));
  96                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit(0);
  97
  98                 UNITS_DISTANCE = new UnitGroup();
  99                 UNITS_DISTANCE.addUnit(new GeneralUnit(1, "m"));
 100                 UNITS_DISTANCE.addUnit(new GeneralUnit(1000, "km"));
 101                 UNITS_DISTANCE.addUnit(new GeneralUnit(0.3048, "ft"));
 102                 UNITS_DISTANCE.addUnit(new GeneralUnit(0.9144, "yd"));
 103                 UNITS_DISTANCE.addUnit(new GeneralUnit(1609.344, "mi"));
 104                 UNITS_DISTANCE.addUnit(new GeneralUnit(1852, "nmi"));
 105
 106                 UNITS_AREA = new UnitGroup();
 107                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.001), "mm" + SQUARED));
 108                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.01), "cm" + SQUARED));
 109                 UNITS_AREA.addUnit(new GeneralUnit(1, "m" + SQUARED));
 110                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.0254), "in" + SQUARED));
 111                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.3048), "ft" + SQUARED));
 112                 UNITS_AREA.setDefaultUnit(1);
 113
 114
 115                 UNITS_STABILITY = new UnitGroup();
 116                 UNITS_STABILITY.addUnit(new GeneralUnit(0.001, "mm"));
 117                 UNITS_STABILITY.addUnit(new GeneralUnit(0.01, "cm"));
 118                 UNITS_STABILITY.addUnit(new GeneralUnit(0.0254, "in"));
 119                 UNITS_STABILITY.addUnit(new CaliberUnit((Rocket) null));
 120                 UNITS_STABILITY.setDefaultUnit(3);
 121
 122                 UNITS_STABILITY_CALIBERS = new UnitGroup();
 123                 UNITS_STABILITY_CALIBERS.addUnit(new GeneralUnit(1, "cal"));
 124
 125
 126                 UNITS_VELOCITY = new UnitGroup();
 127                 UNITS_VELOCITY.addUnit(new GeneralUnit(1, "m/s"));
 128                 UNITS_VELOCITY.addUnit(new GeneralUnit(1 / 3.6, "km/h"));
 129                 UNITS_VELOCITY.addUnit(new GeneralUnit(0.3048, "ft/s"));
 130                 UNITS_VELOCITY.addUnit(new GeneralUnit(0.44704, "mph"));
 131
 132                 UNITS_WINDSPEED = new UnitGroup();
 133                 UNITS_WINDSPEED.addUnit(new GeneralUnit(1, "m/s"));
 134                 UNITS_WINDSPEED.addUnit(new GeneralUnit(1 / 3.6, "km/h"));
 135                 UNITS_WINDSPEED.addUnit(new GeneralUnit(0.3048, "ft/s"));
 136                 UNITS_WINDSPEED.addUnit(new GeneralUnit(0.44704, "mph"));
 137
 138                 UNITS_ACCELERATION = new UnitGroup();
 139                 UNITS_ACCELERATION.addUnit(new GeneralUnit(1, "m/s" + SQUARED));
 140                 UNITS_ACCELERATION.addUnit(new GeneralUnit(0.3048, "ft/s" + SQUARED));
 141                 UNITS_ACCELERATION.addUnit(new GeneralUnit(9.80665, "G"));
 142
 143                 UNITS_MASS = new UnitGroup();
 144                 UNITS_MASS.addUnit(new GeneralUnit(0.001, "g"));
 145                 UNITS_MASS.addUnit(new GeneralUnit(1, "kg"));
 146                 UNITS_MASS.addUnit(new GeneralUnit(0.0283495231, "oz"));
 147                 UNITS_MASS.addUnit(new GeneralUnit(0.45359237, "lb"));
 148
 149                 UNITS_INERTIA = new UnitGroup();
 150                 UNITS_INERTIA.addUnit(new GeneralUnit(0.0001, "kg" + DOT + "cm" + SQUARED));
 151                 UNITS_INERTIA.addUnit(new GeneralUnit(1, "kg" + DOT + "m" + SQUARED));
 152                 UNITS_INERTIA.addUnit(new GeneralUnit(1.82899783e-5, "oz" + DOT + "in" + SQUARED));
 153                 UNITS_INERTIA.addUnit(new GeneralUnit(0.000292639653, "lb" + DOT + "in" + SQUARED));
 154                 UNITS_INERTIA.addUnit(new GeneralUnit(0.0421401101, "lb" + DOT + "ft" + SQUARED));
 155                 UNITS_INERTIA.addUnit(new GeneralUnit(1.35581795, "lbf" + DOT + "ft" + DOT + "s" + SQUARED));
 156                 UNITS_INERTIA.setDefaultUnit(1);
 157
 158                 UNITS_ANGLE = new UnitGroup();
 159                 UNITS_ANGLE.addUnit(new DegreeUnit());
 160                 UNITS_ANGLE.addUnit(new FixedPrecisionUnit("rad", 0.01));
 161                 UNITS_ANGLE.addUnit(new GeneralUnit(1.0 / 3437.74677078, "arcmin"));
 162
 163                 UNITS_DENSITY_BULK = new UnitGroup();
 164                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1000, "g/cm" + CUBED));
 165                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1, "kg/m" + CUBED));
 166                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1729.99404, "oz/in" + CUBED));
 167                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(16.0184634, "lb/ft" + CUBED));
 168
 169                 UNITS_DENSITY_SURFACE = new UnitGroup();
 170                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(10, "g/cm" + SQUARED));
 171                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(0.001, "g/m" + SQUARED));
 172                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(1, "kg/m" + SQUARED));
 173                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(43.9418487, "oz/in" + SQUARED));
 174                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(0.305151727, "oz/ft" + SQUARED));
 175                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(4.88242764, "lb/ft" + SQUARED));
 176                 UNITS_DENSITY_SURFACE.setDefaultUnit(1);
 177
 178                 UNITS_DENSITY_LINE = new UnitGroup();
 179                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(0.001, "g/m"));
 180                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(1, "kg/m"));
 181                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(0.0930102465, "oz/ft"));
 182
 183                 UNITS_FORCE = new UnitGroup();
 184                 UNITS_FORCE.addUnit(new GeneralUnit(1, "N"));
 185                 UNITS_FORCE.addUnit(new GeneralUnit(4.44822162, "lbf"));
 186                 UNITS_FORCE.addUnit(new GeneralUnit(9.80665, "kgf"));
 187
 188                 UNITS_IMPULSE = new UnitGroup();
 189                 UNITS_IMPULSE.addUnit(new GeneralUnit(1, "Ns"));
 190                 UNITS_IMPULSE.addUnit(new GeneralUnit(4.44822162, "lbf" + DOT + "s"));
 191
 192                 UNITS_TIME_STEP = new UnitGroup();
 193                 UNITS_TIME_STEP.addUnit(new FixedPrecisionUnit("ms", 1, 0.001));
 194                 UNITS_TIME_STEP.addUnit(new FixedPrecisionUnit("s", 0.01));
 195                 UNITS_TIME_STEP.setDefaultUnit(1);
 196
 197                 UNITS_SHORT_TIME = new UnitGroup();
 198                 UNITS_SHORT_TIME.addUnit(new GeneralUnit(1, "s"));
 199
 200                 UNITS_FLIGHT_TIME = new UnitGroup();
 201                 UNITS_FLIGHT_TIME.addUnit(new GeneralUnit(1, "s"));
 202                 UNITS_FLIGHT_TIME.addUnit(new GeneralUnit(60, "min"));
 203
 204                 UNITS_ROLL = new UnitGroup();
 205                 UNITS_ROLL.addUnit(new GeneralUnit(1, "rad/s"));
 206                 UNITS_ROLL.addUnit(new GeneralUnit(2 * Math.PI, "r/s"));
 207                 UNITS_ROLL.addUnit(new GeneralUnit(2 * Math.PI / 60, "rpm"));
 208                 UNITS_ROLL.setDefaultUnit(1);
 209
 210                 UNITS_TEMPERATURE = new UnitGroup();
 211                 UNITS_TEMPERATURE.addUnit(new FixedPrecisionUnit("K", 1));
 212                 UNITS_TEMPERATURE.addUnit(new TemperatureUnit(1, 273.15, DEGREE + "C"));
 213                 UNITS_TEMPERATURE.addUnit(new TemperatureUnit(5.0 / 9.0, 459.67, DEGREE + "F"));
 214                 UNITS_TEMPERATURE.setDefaultUnit(1);
 215
 216                 UNITS_PRESSURE = new UnitGroup();
 217                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("mbar", 1, 1.0e2));
 218                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("bar", 0.001, 1.0e5));
 219                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("atm", 0.001, 1.01325e5));
 220                 UNITS_PRESSURE.addUnit(new GeneralUnit(101325.0 / 760.0, "mmHg"));
 221                 UNITS_PRESSURE.addUnit(new GeneralUnit(3386.389, "inHg"));
 222                 UNITS_PRESSURE.addUnit(new GeneralUnit(6894.75729, "psi"));
 223                 UNITS_PRESSURE.addUnit(new GeneralUnit(1, "Pa"));
 224
 225                 UNITS_RELATIVE = new UnitGroup();
 226                 UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + ZWSP, 0.01, 1.0));
 227                 UNITS_RELATIVE.addUnit(new GeneralUnit(0.01, "%"));
 228                 UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + PERMILLE, 1, 0.001));
 229                 //              UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + ZWSP, 0.01, 1.0));
 230                 //              UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("%", 1, 0.01));
 231                 //              UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("" + PERMILLE, 1, 0.001));
 232                 UNITS_RELATIVE.setDefaultUnit(1);
 233
 234
 235                 UNITS_ROUGHNESS = new UnitGroup();
 236                 UNITS_ROUGHNESS.addUnit(new GeneralUnit(0.000001, MICRO + "m"));
 237                 UNITS_ROUGHNESS.addUnit(new GeneralUnit(0.0000254, "mil"));
 238
 239
 240                 UNITS_COEFFICIENT = new UnitGroup();
 241                 UNITS_COEFFICIENT.addUnit(new FixedPrecisionUnit("" + ZWSP, 0.01)); // zero-width space
 242
 243
 244                 // This is not used by OpenRocket, and not extensively tested:
 245                 //              UNITS_FREQUENCY = new UnitGroup();
 246                 //              UNITS_FREQUENCY.addUnit(new GeneralUnit(1, "s"));
 247                 //              UNITS_FREQUENCY.addUnit(new GeneralUnit(0.001, "ms"));
 248                 //              UNITS_FREQUENCY.addUnit(new GeneralUnit(0.000001, MICRO + "s"));
 249                 //              UNITS_FREQUENCY.addUnit(new FrequencyUnit(1, "Hz"));
 250                 //              UNITS_FREQUENCY.addUnit(new FrequencyUnit(1000, "kHz"));
 251                 //              UNITS_FREQUENCY.setDefaultUnit(3);
 252
 253
 254                 HashMap<String, UnitGroup> map = new HashMap<String, UnitGroup>();
 255                 map.put("NONE", UNITS_NONE);
 256                 map.put("LENGTH", UNITS_LENGTH);
 257                 map.put("MOTOR_DIMENSIONS", UNITS_MOTOR_DIMENSIONS);
 258                 map.put("DISTANCE", UNITS_DISTANCE);
 259                 map.put("VELOCITY", UNITS_VELOCITY);
 260                 map.put("ACCELERATION", UNITS_ACCELERATION);
 261                 map.put("AREA", UNITS_AREA);
 262                 map.put("STABILITY", UNITS_STABILITY);
 263                 map.put("MASS", UNITS_MASS);
 264                 map.put("INERTIA", UNITS_INERTIA);
 265                 map.put("ANGLE", UNITS_ANGLE);
 266                 map.put("DENSITY_BULK", UNITS_DENSITY_BULK);
 267                 map.put("DENSITY_SURFACE", UNITS_DENSITY_SURFACE);
 268                 map.put("DENSITY_LINE", UNITS_DENSITY_LINE);
 269                 map.put("FORCE", UNITS_FORCE);
 270                 map.put("IMPULSE", UNITS_IMPULSE);
 271                 map.put("TIME_STEP", UNITS_TIME_STEP);
 272                 map.put("SHORT_TIME", UNITS_SHORT_TIME);
 273                 map.put("FLIGHT_TIME", UNITS_FLIGHT_TIME);
 274                 map.put("ROLL", UNITS_ROLL);
 275                 map.put("TEMPERATURE", UNITS_TEMPERATURE);
 276                 map.put("PRESSURE", UNITS_PRESSURE);
 277                 map.put("RELATIVE", UNITS_RELATIVE);
 278                 map.put("ROUGHNESS", UNITS_ROUGHNESS);
 279                 map.put("COEFFICIENT", UNITS_COEFFICIENT);
 280
 281                 UNITS = Collections.unmodifiableMap(map);
 282         }
 283
 284         public static void setDefaultMetricUnits() {
 285                 UNITS_LENGTH.setDefaultUnit("cm");
 286                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit("mm");
 287                 UNITS_DISTANCE.setDefaultUnit("m");
 288                 UNITS_AREA.setDefaultUnit("cm" + SQUARED);
 289                 UNITS_STABILITY.setDefaultUnit("cal");
 290                 UNITS_VELOCITY.setDefaultUnit("m/s");
 291                 UNITS_ACCELERATION.setDefaultUnit("m/s" + SQUARED);
 292                 UNITS_MASS.setDefaultUnit("g");
 293                 UNITS_INERTIA.setDefaultUnit("kg" + DOT + "m" + SQUARED);
 294                 UNITS_ANGLE.setDefaultUnit("" + DEGREE);
 295                 UNITS_DENSITY_BULK.setDefaultUnit("g/cm" + CUBED);
 296                 UNITS_DENSITY_SURFACE.setDefaultUnit("g/m" + SQUARED);
 297                 UNITS_DENSITY_LINE.setDefaultUnit("g/m");
 298                 UNITS_FORCE.setDefaultUnit("N");
 299                 UNITS_IMPULSE.setDefaultUnit("Ns");
 300                 UNITS_TIME_STEP.setDefaultUnit("s");
 301                 UNITS_FLIGHT_TIME.setDefaultUnit("s");
 302                 UNITS_ROLL.setDefaultUnit("r/s");
 303                 UNITS_TEMPERATURE.setDefaultUnit(DEGREE + "C");
 304                 UNITS_WINDSPEED.setDefaultUnit("m/s");
 305                 UNITS_PRESSURE.setDefaultUnit("mbar");
 306                 UNITS_RELATIVE.setDefaultUnit("%");
 307                 UNITS_ROUGHNESS.setDefaultUnit(MICRO + "m");
 308         }
 309
 310         public static void setDefaultImperialUnits() {
 311                 UNITS_LENGTH.setDefaultUnit("in");
 312                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit("in");
 313                 UNITS_DISTANCE.setDefaultUnit("ft");
 314                 UNITS_AREA.setDefaultUnit("in" + SQUARED);
 315                 UNITS_STABILITY.setDefaultUnit("cal");
 316                 UNITS_VELOCITY.setDefaultUnit("ft/s");
 317                 UNITS_ACCELERATION.setDefaultUnit("ft/s" + SQUARED);
 318                 UNITS_MASS.setDefaultUnit("oz");
 319                 UNITS_INERTIA.setDefaultUnit("lb" + DOT + "ft" + SQUARED);
 320                 UNITS_ANGLE.setDefaultUnit("" + DEGREE);
 321                 UNITS_DENSITY_BULK.setDefaultUnit("oz/in" + CUBED);
 322                 UNITS_DENSITY_SURFACE.setDefaultUnit("oz/ft" + SQUARED);
 323                 UNITS_DENSITY_LINE.setDefaultUnit("oz/ft");
 324                 UNITS_FORCE.setDefaultUnit("N");
 325                 UNITS_IMPULSE.setDefaultUnit("Ns");
 326                 UNITS_TIME_STEP.setDefaultUnit("s");
 327                 UNITS_FLIGHT_TIME.setDefaultUnit("s");
 328                 UNITS_ROLL.setDefaultUnit("r/s");
 329                 UNITS_TEMPERATURE.setDefaultUnit(DEGREE + "F");
 330                 UNITS_WINDSPEED.setDefaultUnit("mph");
 331                 UNITS_PRESSURE.setDefaultUnit("mbar");
 332                 UNITS_RELATIVE.setDefaultUnit("%");
 333                 UNITS_ROUGHNESS.setDefaultUnit("mil");
 334         }
 335
 336
 337         /**
 338          * Return a UnitGroup for stability units based on the rocket.
 339          *
 340          * @param rocket        the rocket from which to calculate the caliber
 341          * @return                      the unit group
 342          */
 343         public static UnitGroup stabilityUnits(Rocket rocket) {
 344                 return new StabilityUnitGroup(rocket);
 345         }
 346
 347
 348         /**
 349          * Return a UnitGroup for stability units based on the rocket configuration.
 350          *
 351          * @param config        the rocket configuration from which to calculate the caliber
 352          * @return                      the unit group
 353          */
 354         public static UnitGroup stabilityUnits(Configuration config) {
 355                 return new StabilityUnitGroup(config);
 356         }
 357
 358
 359         /**
 360          * Return a UnitGroup for stability units based on a constant caliber.
 361          *
 362          * @param reference     the constant reference length
 363          * @return                      the unit group
 364          */
 365         public static UnitGroup stabilityUnits(double reference) {
 366                 return new StabilityUnitGroup(reference);
 367         }
 368
 369
 370         //////////////////////////////////////////////////////
 371
 372
 373         protected ArrayList<Unit> units = new ArrayList<Unit>();
 374         protected int defaultUnit = 0;
 375
 376         public int getUnitCount() {
 377                 return units.size();
 378         }
 379
 380         public Unit getDefaultUnit() {
 381                 return units.get(defaultUnit);
 382         }
 383
 384         public int getDefaultUnitIndex() {
 385                 return defaultUnit;
 386         }
 387
 388         public void setDefaultUnit(int n) {
 389                 if (n < 0 || n >= units.size()) {
 390                         throw new IllegalArgumentException("index out of range: " + n);
 391                 }
 392                 defaultUnit = n;
 393         }
 394
 395
 396
 397         /**
 398          * Find a unit by approximate unit name.  Only letters and (ordinary) numbers are
 399          * considered in the matching.  This method is mainly means for testing, allowing
 400          * a simple means to obtain a particular unit.
 401          *
 402          * @param str   the unit name.
 403          * @return              the corresponding unit, or <code>null</code> if not found.
 404          */
 405         public Unit findApproximate(String str) {
 406                 str = str.replaceAll("\\W", "").trim();
 407                 for (Unit u : units) {
 408                         String name = u.getUnit().replaceAll("\\W", "").trim();
 409                         if (str.equalsIgnoreCase(name))
 410                                 return u;
 411                 }
 412                 return null;
 413         }
 414
 415         /**
 416          * Set the default unit based on the unit name.  Throws an exception if a
 417          * unit with the provided name is not available.
 418          *
 419          * @param   name        the unit name.
 420          * @throws  IllegalArgumentException    if the corresponding unit is not found in the group.
 421          */
 422         public void setDefaultUnit(String name) throws IllegalArgumentException {
 423                 for (int i = 0; i < units.size(); i++) {
 424                         if (units.get(i).getUnit().equals(name)) {
 425                                 setDefaultUnit(i);
 426                                 return;
 427                         }
 428                 }
 429                 throw new IllegalArgumentException("name=" + name);
 430         }
 431
 432         public Unit getUnit( String name ) throws IllegalArgumentException {
 433                 for (int i = 0; i < units.size(); i++) {
 434                         if (units.get(i).getUnit().equals(name)) {
 435                                 return units.get(i);
 436                         }
 437                 }
 438                 throw new IllegalArgumentException("name=" + name);
 439         }
 440
 441         public Unit getUnit(int n) {
 442                 return units.get(n);
 443         }
 444
 445         public int getUnitIndex(Unit u) {
 446                 return units.indexOf(u);
 447         }
 448
 449         public void addUnit(Unit u) {
 450                 units.add(u);
 451         }
 452
 453         public boolean contains(Unit u) {
 454                 return units.contains(u);
 455         }
 456
 457         public Unit[] getUnits() {
 458                 return units.toArray(new Unit[0]);
 459         }
 460
 461         /**
 462          * Return the value in SI units from the default unit of this group.
 463          * It is the same as calling <code>getDefaultUnit().fromUnit(value)</code>
 464          *
 465          * @param value the default unit value to convert
 466          * @return the value in SI units.
 467          * @see Unit#fromUnit(double)
 468          */
 469         public double fromUnit( double value ) {
 470                 return this.getDefaultUnit().fromUnit(value);
 471         }
 472
 473         /**
 474          * Return the value formatted by the default unit of this group.
 475          * It is the same as calling <code>getDefaultUnit().toString(value)</code>.
 476          *
 477          * @param value         the SI value to format.
 478          * @return                      the formatted string.
 479          * @see                         Unit#toString(double)
 480          */
 481         public String toString(double value) {
 482                 return this.getDefaultUnit().toString(value);
 483         }
 484
 485
 486         /**
 487          * Return the value formatted by the default unit of this group including the unit.
 488          * It is the same as calling <code>getDefaultUnit().toStringUnit(value)</code>.
 489          *
 490          * @param value         the SI value to format.
 491          * @return                      the formatted string.
 492          * @see                         Unit#toStringUnit(double)
 493          */
 494         public String toStringUnit(double value) {
 495                 return this.getDefaultUnit().toStringUnit(value);
 496         }
 497
 498
 499
 500
 501
 502         /**
 503          * Creates a new Value object with the specified value and the default unit of this group.
 504          *
 505          * @param value the value to set.
 506          * @return              a new Value object.
 507          */
 508         public Value toValue(double value) {
 509                 return this.getDefaultUnit().toValue(value);
 510         }
 511
 512
 513
 514
 515         private static final Pattern STRING_PATTERN = Pattern.compile("^\\s*([0-9.,-]+)(.*?)$");
 516
 517         /**
 518          * Converts a string into an SI value.  If the string has one of the units in this
 519          * group appended to it, that unit will be used in conversion.  Otherwise the default
 520          * unit will be used.  If an unknown unit is specified or the value does not parse
 521          * with <code>Double.parseDouble</code> then a <code>NumberFormatException</code>
 522          * is thrown.
 523          * <p>
 524          * This method is applicable only for simple units without e.g. powers.
 525          *
 526          * @param str   the string to parse.
 527          * @return              the SI value.
 528          * @throws NumberFormatException   if the string cannot be parsed.
 529          */
 530         public double fromString(String str) {
 531                 Matcher matcher = STRING_PATTERN.matcher(str);
 532
 533                 if (!matcher.matches()) {
 534                         throw new NumberFormatException("string did not match required pattern");
 535                 }
 536
 537                 double value = Double.parseDouble(matcher.group(1));
 538                 String unit = matcher.group(2).trim();
 539
 540                 if (unit.equals("")) {
 541                         value = this.getDefaultUnit().fromUnit(value);
 542                 } else {
 543                         int i;
 544                         for (i = 0; i < units.size(); i++) {
 545                                 Unit u = units.get(i);
 546                                 if (unit.equalsIgnoreCase(u.getUnit())) {
 547                                         value = u.fromUnit(value);
 548                                         break;
 549                                 }
 550                         }
 551                         if (i >= units.size()) {
 552                                 throw new NumberFormatException("unknown unit " + unit);
 553                         }
 554                 }
 555
 556                 return value;
 557         }
 558
 559
 560         ///////////////////////////
 561
 562
 563         /**
 564          * A private class that switches the CaliberUnit to a rocket-specific CaliberUnit.
 565          * All other methods are passed through to UNITS_STABILITY.
 566          */
 567         private static class StabilityUnitGroup extends UnitGroup {
 568
 569                 public StabilityUnitGroup(double ref) {
 570                         this(new CaliberUnit(ref));
 571                 }
 572
 573                 public StabilityUnitGroup(Rocket rocket) {
 574                         this(new CaliberUnit(rocket));
 575                 }
 576
 577                 public StabilityUnitGroup(Configuration config) {
 578                         this(new CaliberUnit(config));
 579                 }
 580
 581                 private StabilityUnitGroup(CaliberUnit caliberUnit) {
 582                         this.units.addAll(UnitGroup.UNITS_STABILITY.units);
 583                         this.defaultUnit = UnitGroup.UNITS_STABILITY.defaultUnit;
 584                         for (int i = 0; i < units.size(); i++) {
 585                                 if (units.get(i) instanceof CaliberUnit) {
 586                                         units.set(i, caliberUnit);
 587                                 }
 588                         }
 589                 }
 590
 591
 592                 @Override
 593                 public void setDefaultUnit(int n) {
 594                         super.setDefaultUnit(n);
 595                         UNITS_STABILITY.setDefaultUnit(n);
 596                 }
 597         }
 598 }