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.MathUtil.pow2;
   4
   5 import java.util.ArrayList;
   6 import java.util.Collections;
   7 import java.util.HashMap;
   8 import java.util.Map;
   9 import java.util.regex.Matcher;
  10 import java.util.regex.Pattern;
  11
  12 import net.sf.openrocket.rocketcomponent.Configuration;
  13 import net.sf.openrocket.rocketcomponent.Rocket;
  14
  15
  16 /**
  17  * A group of units (eg. length, mass etc.).  Contains a list of different units of a same
  18  * quantity.
  19  *
  20  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  21  */
  22
  23 public class UnitGroup {
  24
  25         public static final UnitGroup UNITS_NONE;
  26
  27         public static final UnitGroup UNITS_MOTOR_DIMENSIONS;
  28         public static final UnitGroup UNITS_LENGTH;
  29         public static final UnitGroup UNITS_DISTANCE;
  30
  31         public static final UnitGroup UNITS_AREA;
  32         public static final UnitGroup UNITS_STABILITY;
  33         public static final UnitGroup UNITS_VELOCITY;
  34         public static final UnitGroup UNITS_ACCELERATION;
  35         public static final UnitGroup UNITS_MASS;
  36         public static final UnitGroup UNITS_ANGLE;
  37         public static final UnitGroup UNITS_DENSITY_BULK;
  38         public static final UnitGroup UNITS_DENSITY_SURFACE;
  39         public static final UnitGroup UNITS_DENSITY_LINE;
  40         public static final UnitGroup UNITS_FORCE;
  41         public static final UnitGroup UNITS_IMPULSE;
  42
  43         /** Time in the order of less than a second (time step etc). */
  44         public static final UnitGroup UNITS_TIME_STEP;
  45
  46         /** Time in the order of seconds (motor delay etc). */
  47         public static final UnitGroup UNITS_SHORT_TIME;
  48
  49         /** Time in the order of the flight time of a rocket. */
  50         public static final UnitGroup UNITS_FLIGHT_TIME;
  51         public static final UnitGroup UNITS_ROLL;
  52         public static final UnitGroup UNITS_TEMPERATURE;
  53         public static final UnitGroup UNITS_PRESSURE;
  54         public static final UnitGroup UNITS_RELATIVE;
  55         public static final UnitGroup UNITS_ROUGHNESS;
  56
  57         public static final UnitGroup UNITS_COEFFICIENT;
  58
  59
  60         public static final Map<String, UnitGroup> UNITS;
  61
  62
  63         /*
  64          * Note:  Units may not use HTML tags.
  65          */
  66         static {
  67                 UNITS_NONE = new UnitGroup();
  68                 UNITS_NONE.addUnit(Unit.NOUNIT2);
  69
  70                 UNITS_LENGTH = new UnitGroup();
  71                 UNITS_LENGTH.addUnit(new GeneralUnit(0.001,"mm"));
  72                 UNITS_LENGTH.addUnit(new GeneralUnit(0.01,"cm"));
  73                 UNITS_LENGTH.addUnit(new GeneralUnit(1,"m"));
  74                 UNITS_LENGTH.addUnit(new GeneralUnit(0.0254,"in"));
  75                 UNITS_LENGTH.addUnit(new GeneralUnit(0.3048,"ft"));
  76                 UNITS_LENGTH.setDefaultUnit(1);
  77
  78                 UNITS_MOTOR_DIMENSIONS = new UnitGroup();
  79                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.001,"mm"));
  80                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.01,"cm"));
  81                 UNITS_MOTOR_DIMENSIONS.addUnit(new GeneralUnit(0.0254,"in"));
  82                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit(0);
  83
  84                 UNITS_DISTANCE = new UnitGroup();
  85                 UNITS_DISTANCE.addUnit(new GeneralUnit(1,"m"));
  86                 UNITS_DISTANCE.addUnit(new GeneralUnit(1000,"km"));
  87                 UNITS_DISTANCE.addUnit(new GeneralUnit(0.3048,"ft"));
  88                 UNITS_DISTANCE.addUnit(new GeneralUnit(0.9144,"yd"));
  89                 UNITS_DISTANCE.addUnit(new GeneralUnit(1609.344,"mi"));
  90
  91                 UNITS_AREA = new UnitGroup();
  92                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.001),"mm\u00b2"));
  93                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.01),"cm\u00b2"));
  94                 UNITS_AREA.addUnit(new GeneralUnit(1,"m\u00b2"));
  95                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.0254),"in\u00b2"));
  96                 UNITS_AREA.addUnit(new GeneralUnit(pow2(0.3048),"ft\u00b2"));
  97                 UNITS_AREA.setDefaultUnit(1);
  98
  99
 100                 UNITS_STABILITY = new UnitGroup();
 101                 UNITS_STABILITY.addUnit(new GeneralUnit(0.001,"mm"));
 102                 UNITS_STABILITY.addUnit(new GeneralUnit(0.01,"cm"));
 103                 UNITS_STABILITY.addUnit(new GeneralUnit(0.0254,"in"));
 104                 UNITS_STABILITY.addUnit(new CaliberUnit((Rocket)null));
 105                 UNITS_STABILITY.setDefaultUnit(3);
 106
 107                 UNITS_VELOCITY = new UnitGroup();
 108                 UNITS_VELOCITY.addUnit(new GeneralUnit(1, "m/s"));
 109                 UNITS_VELOCITY.addUnit(new GeneralUnit(1/3.6, "km/h"));
 110                 UNITS_VELOCITY.addUnit(new GeneralUnit(0.3048, "ft/s"));
 111                 UNITS_VELOCITY.addUnit(new GeneralUnit(0.44704, "mph"));
 112
 113                 UNITS_ACCELERATION = new UnitGroup();
 114                 UNITS_ACCELERATION.addUnit(new GeneralUnit(1, "m/s\u00b2"));
 115                 UNITS_ACCELERATION.addUnit(new GeneralUnit(0.3048, "ft/s\u00b2"));
 116
 117
 118                 UNITS_MASS = new UnitGroup();
 119                 UNITS_MASS.addUnit(new GeneralUnit(0.001,"g"));
 120                 UNITS_MASS.addUnit(new GeneralUnit(1,"kg"));
 121                 UNITS_MASS.addUnit(new GeneralUnit(0.0283495231,"oz"));
 122                 UNITS_MASS.addUnit(new GeneralUnit(0.45359237,"lb"));
 123
 124                 UNITS_ANGLE = new UnitGroup();
 125                 UNITS_ANGLE.addUnit(new DegreeUnit());
 126                 UNITS_ANGLE.addUnit(new FixedPrecisionUnit("rad",0.01));
 127
 128                 UNITS_DENSITY_BULK = new UnitGroup();
 129                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1000,"g/cm\u00b3"));
 130                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1,"kg/m\u00b3"));
 131                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(1729.99404,"oz/in\u00b3"));
 132                 UNITS_DENSITY_BULK.addUnit(new GeneralUnit(16.0184634,"lb/ft\u00b3"));
 133
 134                 UNITS_DENSITY_SURFACE = new UnitGroup();
 135                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(10,"g/cm\u00b2"));
 136                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(0.001,"g/m\u00b2"));
 137                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(1,"kg/m\u00b2"));
 138                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(43.9418487,"oz/in\u00b2"));
 139                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(0.305151727,"oz/ft\u00b2"));
 140                 UNITS_DENSITY_SURFACE.addUnit(new GeneralUnit(4.88242764,"lb/ft\u00b2"));
 141                 UNITS_DENSITY_SURFACE.setDefaultUnit(1);
 142
 143                 UNITS_DENSITY_LINE = new UnitGroup();
 144                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(0.001,"g/m"));
 145                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(1,"kg/m"));
 146                 UNITS_DENSITY_LINE.addUnit(new GeneralUnit(0.0930102465,"oz/ft"));
 147
 148                 UNITS_FORCE = new UnitGroup();
 149                 UNITS_FORCE.addUnit(new GeneralUnit(1,"N"));
 150                 UNITS_FORCE.addUnit(new GeneralUnit(4.44822162,"lbf"));
 151                 UNITS_FORCE.addUnit(new GeneralUnit(9.80665,"kgf"));
 152
 153                 UNITS_IMPULSE = new UnitGroup();
 154                 UNITS_IMPULSE.addUnit(new GeneralUnit(1,"Ns"));
 155                 UNITS_IMPULSE.addUnit(new GeneralUnit(4.44822162, "lbf\u00b7s"));
 156
 157                 UNITS_TIME_STEP = new UnitGroup();
 158                 UNITS_TIME_STEP.addUnit(new FixedPrecisionUnit("ms", 1, 0.001));
 159                 UNITS_TIME_STEP.addUnit(new FixedPrecisionUnit("s", 0.01));
 160                 UNITS_TIME_STEP.setDefaultUnit(1);
 161
 162                 UNITS_SHORT_TIME = new UnitGroup();
 163                 UNITS_SHORT_TIME.addUnit(new GeneralUnit(1,"s"));
 164
 165                 UNITS_FLIGHT_TIME = new UnitGroup();
 166                 UNITS_FLIGHT_TIME.addUnit(new GeneralUnit(1,"s"));
 167                 UNITS_FLIGHT_TIME.addUnit(new GeneralUnit(60,"min"));
 168
 169                 UNITS_ROLL = new UnitGroup();
 170                 UNITS_ROLL.addUnit(new GeneralUnit(1, "rad/s"));
 171                 UNITS_ROLL.addUnit(new GeneralUnit(2*Math.PI, "r/s"));
 172                 UNITS_ROLL.addUnit(new GeneralUnit(2*Math.PI/60, "rpm"));
 173                 UNITS_ROLL.setDefaultUnit(1);
 174
 175                 UNITS_TEMPERATURE = new UnitGroup();
 176                 UNITS_TEMPERATURE.addUnit(new FixedPrecisionUnit("K", 1));
 177                 UNITS_TEMPERATURE.addUnit(new TemperatureUnit(1, 273.15, "\u00b0C"));
 178                 UNITS_TEMPERATURE.addUnit(new TemperatureUnit(5.0/9.0, 459.67, "\u00b0F"));
 179                 UNITS_TEMPERATURE.setDefaultUnit(1);
 180
 181                 UNITS_PRESSURE = new UnitGroup();
 182                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("mbar", 1, 1.0e2));
 183                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("bar", 0.001, 1.0e5));
 184                 UNITS_PRESSURE.addUnit(new FixedPrecisionUnit("atm", 0.001, 1.01325e5));
 185                 UNITS_PRESSURE.addUnit(new GeneralUnit(101325.0/760.0, "mmHg"));
 186                 UNITS_PRESSURE.addUnit(new GeneralUnit(3386.389, "inHg"));
 187                 UNITS_PRESSURE.addUnit(new GeneralUnit(6894.75729, "psi"));
 188                 UNITS_PRESSURE.addUnit(new GeneralUnit(1, "Pa"));
 189
 190                 UNITS_RELATIVE = new UnitGroup();
 191                 UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("\u200b", 0.01));
 192                 UNITS_RELATIVE.addUnit(new FixedPrecisionUnit("%", 1, 0.01));
 193                 UNITS_RELATIVE.setDefaultUnit(1);
 194
 195
 196                 UNITS_ROUGHNESS = new UnitGroup();
 197                 UNITS_ROUGHNESS.addUnit(new GeneralUnit(0.000001, "\u03bcm"));
 198                 UNITS_ROUGHNESS.addUnit(new GeneralUnit(0.0000254, "mil"));
 199
 200
 201                 UNITS_COEFFICIENT = new UnitGroup();
 202                 UNITS_COEFFICIENT.addUnit(new FixedPrecisionUnit("\u200b", 0.01));  // zero-width space
 203
 204
 205                 HashMap<String,UnitGroup> map = new HashMap<String,UnitGroup>();
 206                 map.put("NONE", UNITS_NONE);
 207                 map.put("LENGTH", UNITS_LENGTH);
 208                 map.put("MOTOR_DIMENSIONS", UNITS_MOTOR_DIMENSIONS);
 209                 map.put("DISTANCE", UNITS_DISTANCE);
 210                 map.put("VELOCITY", UNITS_VELOCITY);
 211                 map.put("ACCELERATION", UNITS_ACCELERATION);
 212                 map.put("AREA", UNITS_AREA);
 213                 map.put("STABILITY", UNITS_STABILITY);
 214                 map.put("MASS", UNITS_MASS);
 215                 map.put("ANGLE", UNITS_ANGLE);
 216                 map.put("DENSITY_BULK", UNITS_DENSITY_BULK);
 217                 map.put("DENSITY_SURFACE", UNITS_DENSITY_SURFACE);
 218                 map.put("DENSITY_LINE", UNITS_DENSITY_LINE);
 219                 map.put("FORCE", UNITS_FORCE);
 220                 map.put("IMPULSE", UNITS_IMPULSE);
 221                 map.put("TIME_STEP", UNITS_TIME_STEP);
 222                 map.put("SHORT_TIME", UNITS_SHORT_TIME);
 223                 map.put("FLIGHT_TIME", UNITS_FLIGHT_TIME);
 224                 map.put("ROLL", UNITS_ROLL);
 225                 map.put("TEMPERATURE", UNITS_TEMPERATURE);
 226                 map.put("PRESSURE", UNITS_PRESSURE);
 227                 map.put("RELATIVE", UNITS_RELATIVE);
 228                 map.put("ROUGHNESS", UNITS_ROUGHNESS);
 229                 map.put("COEFFICIENT", UNITS_COEFFICIENT);
 230
 231                 UNITS = Collections.unmodifiableMap(map);
 232         }
 233
 234         public static void setDefaultMetricUnits() {
 235                 UNITS_LENGTH.setDefaultUnit("cm");
 236                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit("mm");
 237                 UNITS_DISTANCE.setDefaultUnit("m");
 238                 UNITS_AREA.setDefaultUnit("cm\u00b2");
 239                 UNITS_STABILITY.setDefaultUnit("cal");
 240                 UNITS_VELOCITY.setDefaultUnit("m/s");
 241                 UNITS_ACCELERATION.setDefaultUnit("m/s\u00b2");
 242                 UNITS_MASS.setDefaultUnit("g");
 243                 UNITS_ANGLE.setDefaultUnit(0);
 244                 UNITS_DENSITY_BULK.setDefaultUnit("g/cm\u00b3");
 245                 UNITS_DENSITY_SURFACE.setDefaultUnit("g/m\u00b2");
 246                 UNITS_DENSITY_LINE.setDefaultUnit("g/m");
 247                 UNITS_FORCE.setDefaultUnit("N");
 248                 UNITS_IMPULSE.setDefaultUnit("Ns");
 249                 UNITS_TIME_STEP.setDefaultUnit("s");
 250                 UNITS_FLIGHT_TIME.setDefaultUnit("s");
 251                 UNITS_ROLL.setDefaultUnit("r/s");
 252                 UNITS_TEMPERATURE.setDefaultUnit(1);
 253                 UNITS_PRESSURE.setDefaultUnit("mbar");
 254                 UNITS_RELATIVE.setDefaultUnit("%");
 255                 UNITS_ROUGHNESS.setDefaultUnit("\u03bcm");
 256         }
 257
 258         public static void setDefaultImperialUnits() {
 259                 UNITS_LENGTH.setDefaultUnit("in");
 260                 UNITS_MOTOR_DIMENSIONS.setDefaultUnit("in");
 261                 UNITS_DISTANCE.setDefaultUnit("ft");
 262                 UNITS_AREA.setDefaultUnit("in\u00b2");
 263                 UNITS_STABILITY.setDefaultUnit("cal");
 264                 UNITS_VELOCITY.setDefaultUnit("ft/s");
 265                 UNITS_ACCELERATION.setDefaultUnit("ft/s\u00b2");
 266                 UNITS_MASS.setDefaultUnit("oz");
 267                 UNITS_ANGLE.setDefaultUnit(0);
 268                 UNITS_DENSITY_BULK.setDefaultUnit("oz/in\u00b3");
 269                 UNITS_DENSITY_SURFACE.setDefaultUnit("oz/ft\u00b2");
 270                 UNITS_DENSITY_LINE.setDefaultUnit("oz/ft");
 271                 UNITS_FORCE.setDefaultUnit("N");
 272                 UNITS_IMPULSE.setDefaultUnit("Ns");
 273                 UNITS_TIME_STEP.setDefaultUnit("s");
 274                 UNITS_FLIGHT_TIME.setDefaultUnit("s");
 275                 UNITS_ROLL.setDefaultUnit("r/s");
 276                 UNITS_TEMPERATURE.setDefaultUnit(2);
 277                 UNITS_PRESSURE.setDefaultUnit("mbar");
 278                 UNITS_RELATIVE.setDefaultUnit("%");
 279                 UNITS_ROUGHNESS.setDefaultUnit("mil");
 280         }
 281
 282
 283
 284         public static UnitGroup stabilityUnits(Rocket rocket) {
 285                 return new StabilityUnitGroup(rocket);
 286         }
 287
 288
 289         public static UnitGroup stabilityUnits(Configuration config) {
 290                 return new StabilityUnitGroup(config);
 291         }
 292
 293
 294         //////////////////////////////////////////////////////
 295
 296
 297         private ArrayList<Unit> units = new ArrayList<Unit>();
 298         private int defaultUnit = 0;
 299
 300         public int getUnitCount() {
 301                 return units.size();
 302         }
 303
 304         public Unit getDefaultUnit() {
 305                 return units.get(defaultUnit);
 306         }
 307
 308         public int getDefaultUnitIndex() {
 309                 return defaultUnit;
 310         }
 311
 312         public void setDefaultUnit(int n) {
 313                 if (n<0 || n>=units.size()) {
 314                         throw new IllegalArgumentException("index out of range: "+n);
 315                 }
 316                 defaultUnit = n;
 317         }
 318
 319
 320
 321         /**
 322          * Find a unit by approximate unit name.  Only letters and (ordinary) numbers are
 323          * considered in the matching.  This method is mainly means for testing, allowing
 324          * a simple means to obtain a particular unit.
 325          *
 326          * @param str   the unit name.
 327          * @return              the corresponding unit, or <code>null</code> if not found.
 328          */
 329         public Unit findApproximate(String str) {
 330                 str = str.replaceAll("\\W", "").trim();
 331                 for (Unit u: units) {
 332                         String name = u.getUnit().replaceAll("\\W", "").trim();
 333                         if (str.equalsIgnoreCase(name))
 334                                 return u;
 335                 }
 336                 return null;
 337         }
 338
 339         /**
 340          * Set the default unit based on the unit name.  Does nothing if the name
 341          * does not match any of the units.
 342          *
 343          * @param name  the unit name (<code>null</code> ok).
 344          * @return              <code>true</code> if the the default was set,
 345          *                              <code>false</code> if a matching unit was not found.
 346          */
 347         public boolean setDefaultUnit(String name) {
 348                 if (name == null)
 349                         return false;
 350
 351                 for (int i=0; i < units.size(); i++) {
 352                         if (name.equals(units.get(i).getUnit())) {
 353                                 setDefaultUnit(i);
 354                                 return true;
 355                         }
 356                 }
 357                 return false;
 358         }
 359
 360
 361         public Unit getUnit(int n) {
 362                 return units.get(n);
 363         }
 364
 365         public int getUnitIndex(Unit u) {
 366                 return units.indexOf(u);
 367         }
 368
 369         public void addUnit(Unit u) {
 370                 units.add(u);
 371         }
 372
 373         public void addUnit(int n, Unit u) {
 374                 units.add(n,u);
 375         }
 376
 377         public void removeUnit(int n) {
 378                 units.remove(n);
 379         }
 380
 381         public boolean contains(Unit u) {
 382                 return units.contains(u);
 383         }
 384
 385         public Unit[] getUnits() {
 386                 return units.toArray(new Unit[0]);
 387         }
 388
 389
 390         /**
 391          * Return the value formatted by the default unit of this group.
 392          * It is the same as calling <code>getDefaultUnit().toString(value)</code>.
 393          *
 394          * @param value         the SI value to format.
 395          * @return                      the formatted string.
 396          * @see                         Unit#toString(double)
 397          */
 398         public String toString(double value) {
 399                 return this.getDefaultUnit().toString(value);
 400         }
 401
 402
 403         /**
 404          * Return the value formatted by the default unit of this group including the unit.
 405          * It is the same as calling <code>getDefaultUnit().toStringUnit(value)</code>.
 406          *
 407          * @param value         the SI value to format.
 408          * @return                      the formatted string.
 409          * @see                         Unit#toStringUnit(double)
 410          */
 411         public String toStringUnit(double value) {
 412                 return this.getDefaultUnit().toStringUnit(value);
 413         }
 414
 415
 416
 417
 418
 419         /**
 420          * Creates a new Value object with the specified value and the default unit of this group.
 421          *
 422          * @param value the value to set.
 423          * @return              a new Value object.
 424          */
 425         public Value toValue(double value) {
 426                 return this.getDefaultUnit().toValue(value);
 427         }
 428
 429
 430
 431
 432         private static final Pattern STRING_PATTERN = Pattern.compile("^\\s*([0-9.,-]+)(.*?)$");
 433         /**
 434          * Converts a string into an SI value.  If the string has one of the units in this
 435          * group appended to it, that unit will be used in conversion.  Otherwise the default
 436          * unit will be used.  If an unknown unit is specified or the value does not parse
 437          * with <code>Double.parseDouble</code> then a <code>NumberFormatException</code>
 438          * is thrown.
 439          * <p>
 440          * This method is applicable only for simple units without e.g. powers.
 441          *
 442          * @param str   the string to parse.
 443          * @return              the SI value.
 444          * @throws NumberFormatException   if the string cannot be parsed.
 445          */
 446         public double fromString(String str) {
 447                 Matcher matcher = STRING_PATTERN.matcher(str);
 448
 449                 if (!matcher.matches()) {
 450                         throw new NumberFormatException("string did not match required pattern");
 451                 }
 452
 453                 double value = Double.parseDouble(matcher.group(1));
 454                 String unit = matcher.group(2).trim();
 455
 456                 if (unit.equals("")) {
 457                         value = this.getDefaultUnit().fromUnit(value);
 458                 } else {
 459                         int i;
 460                         for (i=0; i < units.size(); i++) {
 461                                 Unit u = units.get(i);
 462                                 if (unit.equalsIgnoreCase(u.getUnit())) {
 463                                         value = u.fromUnit(value);
 464                                         break;
 465                                 }
 466                         }
 467                         if (i >= units.size()) {
 468                                 throw new NumberFormatException("unknown unit "+unit);
 469                         }
 470                 }
 471
 472                 return value;
 473         }
 474
 475
 476         ///////////////////////////
 477
 478
 479         /**
 480          * A private class that switches the CaliberUnit to a rocket-specific CaliberUnit.
 481          * All other methods are passed through to UNITS_STABILITY.
 482          */
 483         private static class StabilityUnitGroup extends UnitGroup {
 484
 485                 private final CaliberUnit caliberUnit;
 486
 487
 488                 public StabilityUnitGroup(Rocket rocket) {
 489                         caliberUnit = new CaliberUnit(rocket);
 490                 }
 491
 492                 public StabilityUnitGroup(Configuration config) {
 493                         caliberUnit = new CaliberUnit(config);
 494                 }
 495
 496
 497                 ////  Modify CaliberUnit to use local variable
 498
 499                 @Override
 500                 public Unit getDefaultUnit() {
 501                         return getUnit(UNITS_STABILITY.getDefaultUnitIndex());
 502                 }
 503
 504                 @Override
 505                 public Unit getUnit(int n) {
 506                         Unit u = UNITS_STABILITY.getUnit(n);
 507                         if (u instanceof CaliberUnit) {
 508                                 return caliberUnit;
 509                         }
 510                         return u;
 511                 }
 512
 513                 @Override
 514                 public int getUnitIndex(Unit u) {
 515                         if (u instanceof CaliberUnit) {
 516                                 for (int i=0; i < UNITS_STABILITY.getUnitCount(); i++) {
 517                                         if (UNITS_STABILITY.getUnit(i) instanceof CaliberUnit)
 518                                                 return i;
 519                                 }
 520                         }
 521                         return UNITS_STABILITY.getUnitIndex(u);
 522                 }
 523
 524
 525
 526                 ////  Pass on to UNITS_STABILITY
 527
 528                 @Override
 529                 public int getDefaultUnitIndex() {
 530                         return UNITS_STABILITY.getDefaultUnitIndex();
 531                 }
 532
 533                 @Override
 534                 public void setDefaultUnit(int n) {
 535                         UNITS_STABILITY.setDefaultUnit(n);
 536                 }
 537
 538                 @Override
 539                 public int getUnitCount() {
 540                         return UNITS_STABILITY.getUnitCount();
 541                 }
 542
 543
 544                 ////  Unsupported methods
 545
 546                 @Override
 547                 public void addUnit(int n, Unit u) {
 548                         throw new UnsupportedOperationException("StabilityUnitGroup must not be modified");
 549                 }
 550
 551                 @Override
 552                 public void addUnit(Unit u) {
 553                         throw new UnsupportedOperationException("StabilityUnitGroup must not be modified");
 554                 }
 555
 556                 @Override
 557                 public void removeUnit(int n) {
 558                         throw new UnsupportedOperationException("StabilityUnitGroup must not be modified");
 559                 }
 560         }
 561 }