git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/gui/print/DesignReport.java

   1 /*
   2  * DesignReport.java
   3  */
   4 package net.sf.openrocket.gui.print;
   5
   6 import java.awt.Graphics2D;
   7 import java.io.IOException;
   8 import java.text.DecimalFormat;
   9
  10 import net.sf.openrocket.document.OpenRocketDocument;
  11 import net.sf.openrocket.document.Simulation;
  12 import net.sf.openrocket.gui.figureelements.FigureElement;
  13 import net.sf.openrocket.gui.figureelements.RocketInfo;
  14 import net.sf.openrocket.gui.scalefigure.RocketPanel;
  15 import net.sf.openrocket.gui.util.SwingPreferences;
  16 import net.sf.openrocket.logging.LogHelper;
  17 import net.sf.openrocket.masscalc.BasicMassCalculator;
  18 import net.sf.openrocket.masscalc.MassCalculator;
  19 import net.sf.openrocket.masscalc.MassCalculator.MassCalcType;
  20 import net.sf.openrocket.motor.Motor;
  21 import net.sf.openrocket.rocketcomponent.Configuration;
  22 import net.sf.openrocket.rocketcomponent.MotorMount;
  23 import net.sf.openrocket.rocketcomponent.Rocket;
  24 import net.sf.openrocket.rocketcomponent.RocketComponent;
  25 import net.sf.openrocket.rocketcomponent.Stage;
  26 import net.sf.openrocket.simulation.FlightData;
  27 import net.sf.openrocket.simulation.exception.SimulationException;
  28 import net.sf.openrocket.startup.Application;
  29 import net.sf.openrocket.unit.Unit;
  30 import net.sf.openrocket.unit.UnitGroup;
  31 import net.sf.openrocket.util.Chars;
  32 import net.sf.openrocket.util.Coordinate;
  33
  34 import com.itextpdf.text.Document;
  35 import com.itextpdf.text.DocumentException;
  36 import com.itextpdf.text.Element;
  37 import com.itextpdf.text.Paragraph;
  38 import com.itextpdf.text.Rectangle;
  39 import com.itextpdf.text.pdf.BaseFont;
  40 import com.itextpdf.text.pdf.DefaultFontMapper;
  41 import com.itextpdf.text.pdf.PdfContentByte;
  42 import com.itextpdf.text.pdf.PdfPCell;
  43 import com.itextpdf.text.pdf.PdfPTable;
  44 import com.itextpdf.text.pdf.PdfWriter;
  45
  46 /**
  47  * <pre>
  48  * #  Title # Section describing the rocket in general without motors
  49  * # Section describing the rocket in general without motors
  50  * <p/>
  51  * design name
  52  * empty mass & CG
  53  * CP position
  54  * CP position at 5 degree AOA (or similar)
  55  * number of stages
  56  * parachute/streamer sizes
  57  * max. diameter (caliber)
  58  * velocity at exit of rail/rod
  59  * minimum safe velocity reached in x inches/cm
  60  * <p/>
  61  * # Section for each motor configuration
  62  * <p/>
  63  * a summary of the motors, e.g. 3xC6-0; B4-6
  64  * a list of the motors including the manufacturer, designation (maybe also info like burn time, grams of propellant,
  65  * total impulse)
  66  * total grams of propellant
  67  * total impulse
  68  * takeoff weight
  69  * CG and CP position, stability margin
  70  * predicted flight altitude, max. velocity and max. acceleration
  71  * predicted velocity at chute deployment
  72  * predicted descent rate
  73  * Thrust to Weight Ratio of each stage
  74  * <p/>
  75  * </pre>
  76  */
  77 public class DesignReport {
  78
  79         /**
  80          * The logger.
  81          */
  82         private static final LogHelper log = Application.getLogger();
  83     public static final double SCALE_FUDGE_FACTOR = 0.4d;
  84
  85     /**
  86          * The OR Document.
  87          */
  88         private OpenRocketDocument rocketDocument;
  89
  90         /**
  91          * A panel used for rendering of the design diagram.
  92          */
  93         final RocketPanel panel;
  94
  95         /**
  96          * The iText document.
  97          */
  98         protected Document document;
  99
 100     /**
 101      * The figure rotation.
 102      */
 103     private double rotation = 0d;
 104
 105         /** The displayed strings. */
 106         private static final String STAGES = "Stages: ";
 107         private static final String MASS_WITH_MOTORS = "Mass (with motors): ";
 108         private static final String MASS_WITH_MOTOR = "Mass (with motor): ";
 109         private static final String MASS_EMPTY = "Mass (Empty): ";
 110         private static final String STABILITY = "Stability: ";
 111         private static final String CG = "CG: ";
 112         private static final String CP = "CP: ";
 113         private static final String MOTOR = "Motor";
 114         private static final String AVG_THRUST = "Avg Thrust";
 115         private static final String BURN_TIME = "Burn Time";
 116         private static final String MAX_THRUST = "Max Thrust";
 117         private static final String TOTAL_IMPULSE = "Total Impulse";
 118         private static final String THRUST_TO_WT = "Thrust to Wt";
 119         private static final String PROPELLANT_WT = "Propellant Wt";
 120         private static final String SIZE = "Size";
 121         private static final String ALTITUDE = "Altitude";
 122         private static final String FLIGHT_TIME = "Flight Time";
 123         private static final String TIME_TO_APOGEE = "Time to Apogee";
 124         private static final String VELOCITY_OFF_PAD = "Velocity off Pad";
 125         private static final String MAX_VELOCITY = "Max Velocity";
 126         private static final String DEPLOYMENT_VELOCITY = "Velocity at Deployment";
 127         private static final String LANDING_VELOCITY = "Landing Velocity";
 128         private static final String ROCKET_DESIGN = "Rocket Design";
 129         private static final double GRAVITY_CONSTANT = 9.80665d;
 130
 131         /**
 132          * Constructor.
 133          *
 134          * @param theRocDoc the OR document
 135          * @param theIDoc   the iText document
 136      * @param figureRotation the angle the figure is rotated on the screen; printed report will mimic
 137          */
 138         public DesignReport(OpenRocketDocument theRocDoc, Document theIDoc, Double figureRotation) {
 139                 document = theIDoc;
 140                 rocketDocument = theRocDoc;
 141                 panel = new RocketPanel(rocketDocument);
 142         rotation = figureRotation;
 143         }
 144
 145         /**
 146          * Main entry point.  Prints the rocket drawing and design data.
 147          *
 148          * @param writer a direct byte writer
 149          */
 150         public void writeToDocument(PdfWriter writer) {
 151                 if (writer == null) {
 152                         return;
 153                 }
 154                 com.itextpdf.text.Rectangle pageSize = document.getPageSize();
 155                 int pageImageableWidth = (int) pageSize.getWidth() - (int) pageSize.getBorderWidth() * 2;
 156                 int pageImageableHeight = (int) pageSize.getHeight() / 2 - (int) pageSize.getBorderWidthTop();
 157
 158                 PrintUtilities.addText(document, PrintUtilities.BIG_BOLD, ROCKET_DESIGN);
 159
 160                 Rocket rocket = rocketDocument.getRocket();
 161                 final Configuration configuration = rocket.getDefaultConfiguration().clone();
 162                 configuration.setAllStages();
 163                 PdfContentByte canvas = writer.getDirectContent();
 164
 165                 final PrintFigure figure = new PrintFigure(configuration);
 166         figure.setRotation(rotation);
 167
 168                 FigureElement cp = panel.getExtraCP();
 169                 FigureElement cg = panel.getExtraCG();
 170                 RocketInfo text = panel.getExtraText();
 171
 172                 double scale = paintRocketDiagram(pageImageableWidth, pageImageableHeight, canvas, figure, cp, cg);
 173
 174                 canvas.beginText();
 175                 try {
 176                         canvas.setFontAndSize(BaseFont.createFont(PrintUtilities.NORMAL.getFamilyname(), BaseFont.CP1252,
 177                                                                                                                 BaseFont.EMBEDDED), PrintUtilities.NORMAL_FONT_SIZE);
 178                 } catch (DocumentException e) {
 179                         log.error("Could not set font.", e);
 180                 } catch (IOException e) {
 181                         log.error("Could not create font.", e);
 182                 }
 183                 int figHeightPts = (int) (PrintUnit.METERS.toPoints(figure.getFigureHeight()) * 0.4 * (scale / PrintUnit.METERS
 184                                 .toPoints(1)));
 185                 final int diagramHeight = pageImageableHeight * 2 - 70 - (figHeightPts);
 186                 canvas.moveText(document.leftMargin() + pageSize.getBorderWidthLeft(), diagramHeight);
 187                 canvas.moveTextWithLeading(0, -16);
 188
 189                 float initialY = canvas.getYTLM();
 190
 191                 canvas.showText(rocketDocument.getRocket().getName());
 192
 193                 canvas.newlineShowText(STAGES);
 194                 canvas.showText("" + rocket.getStageCount());
 195
 196
 197                 if (configuration.hasMotors()) {
 198                         if (configuration.getStageCount() > 1) {
 199                                 canvas.newlineShowText(MASS_WITH_MOTORS);
 200                         } else {
 201                                 canvas.newlineShowText(MASS_WITH_MOTOR);
 202                         }
 203                 } else {
 204                         canvas.newlineShowText(MASS_EMPTY);
 205                 }
 206                 canvas.showText(text.getMass(UnitGroup.UNITS_MASS.getDefaultUnit()));
 207
 208                 canvas.newlineShowText(STABILITY);
 209                 canvas.showText(text.getStability());
 210
 211                 canvas.newlineShowText(CG);
 212                 canvas.showText(text.getCg());
 213
 214                 canvas.newlineShowText(CP);
 215                 canvas.showText(text.getCp());
 216                 canvas.endText();
 217
 218                 try {
 219                         //Move the internal pointer of the document below that of what was just written using the direct byte buffer.
 220                         Paragraph paragraph = new Paragraph();
 221                         float finalY = canvas.getYTLM();
 222                         int heightOfDiagramAndText = (int) (pageSize.getHeight() - (finalY - initialY + diagramHeight));
 223
 224                         paragraph.setSpacingAfter(heightOfDiagramAndText);
 225                         document.add(paragraph);
 226
 227                         String[] motorIds = rocket.getMotorConfigurationIDs();
 228
 229                         for (int j = 0; j < motorIds.length; j++) {
 230                                 String motorId = motorIds[j];
 231                                 if (motorId != null) {
 232                                         PdfPTable parent = new PdfPTable(2);
 233                                         parent.setWidthPercentage(100);
 234                                         parent.setHorizontalAlignment(Element.ALIGN_LEFT);
 235                                         parent.setSpacingBefore(0);
 236                                         parent.setWidths(new int[] { 1, 3 });
 237                                         int leading = 0;
 238                                         //The first motor config is always null.  Skip it and the top-most motor, then set the leading.
 239                                         if (j > 1) {
 240                                                 leading = 25;
 241                                         }
 242                                         addFlightData(rocket, motorId, parent, leading);
 243                                         addMotorData(rocket, motorId, parent);
 244                                         document.add(parent);
 245                                 }
 246                         }
 247                 } catch (DocumentException e) {
 248                         log.error("Could not modify document.", e);
 249                 }
 250         }
 251
 252
 253         /**
 254          * Paint a diagram of the rocket into the PDF document.
 255          *
 256          * @param thePageImageableWidth  the number of points in the width of the page available for drawing
 257          * @param thePageImageableHeight the number of points in the height of the page available for drawing
 258          * @param theCanvas              the direct byte writer
 259          * @param theFigure              the print figure
 260          * @param theCp                  the center of pressure figure element
 261          * @param theCg                  the center of gravity figure element
 262          *
 263          * @return the scale of the diagram
 264          */
 265         private double paintRocketDiagram(final int thePageImageableWidth, final int thePageImageableHeight,
 266                                                                                 final PdfContentByte theCanvas, final PrintFigure theFigure,
 267                                                                                 final FigureElement theCp, final FigureElement theCg) {
 268                 theFigure.clearAbsoluteExtra();
 269                 theFigure.clearRelativeExtra();
 270                 theFigure.addRelativeExtra(theCp);
 271                 theFigure.addRelativeExtra(theCg);
 272                 theFigure.updateFigure();
 273
 274                 double scale =
 275                                 (thePageImageableWidth * 2.2) / theFigure.getFigureWidth();
 276                 theFigure.setScale(scale);
 277                 /*
 278                  * page dimensions are in points-per-inch, which, in Java2D, are the same as pixels-per-inch; thus we don't need any conversion
 279                  */
 280                 theFigure.setSize(thePageImageableWidth, thePageImageableHeight);
 281                 theFigure.updateFigure();
 282
 283                 final DefaultFontMapper mapper = new DefaultFontMapper();
 284                 Graphics2D g2d = theCanvas.createGraphics(thePageImageableWidth, thePageImageableHeight * 2, mapper);
 285         final double halfFigureHeight = SCALE_FUDGE_FACTOR * theFigure.getFigureHeightPx()/2;
 286         int y = PrintUnit.POINTS_PER_INCH;
 287         //If the y dimension is negative, then it will potentially be drawn off the top of the page.  Move the origin
 288         //to allow for this.
 289         if (theFigure.getDimensions().getY() < 0.0d) {
 290             y += (int)halfFigureHeight;
 291         }
 292         g2d.translate(20, y);
 293
 294                 g2d.scale(SCALE_FUDGE_FACTOR, SCALE_FUDGE_FACTOR);
 295                 theFigure.paint(g2d);
 296                 g2d.dispose();
 297                 return scale;
 298         }
 299
 300         /**
 301          * Add the motor data for a motor configuration to the table.
 302          *
 303          * @param rocket        the rocket
 304          * @param motorId       the motor ID to output
 305          * @param parent        the parent to which the motor data will be added
 306          */
 307         private void addMotorData(Rocket rocket, String motorId, final PdfPTable parent) {
 308
 309                 PdfPTable motorTable = new PdfPTable(8);
 310                 motorTable.setWidthPercentage(68);
 311                 motorTable.setHorizontalAlignment(Element.ALIGN_LEFT);
 312
 313                 final PdfPCell motorCell = ITextHelper.createCell(MOTOR, PdfPCell.BOTTOM);
 314                 final int mPad = 10;
 315                 motorCell.setPaddingLeft(mPad);
 316                 motorTable.addCell(motorCell);
 317                 motorTable.addCell(ITextHelper.createCell(AVG_THRUST, PdfPCell.BOTTOM));
 318                 motorTable.addCell(ITextHelper.createCell(BURN_TIME, PdfPCell.BOTTOM));
 319                 motorTable.addCell(ITextHelper.createCell(MAX_THRUST, PdfPCell.BOTTOM));
 320                 motorTable.addCell(ITextHelper.createCell(TOTAL_IMPULSE, PdfPCell.BOTTOM));
 321                 motorTable.addCell(ITextHelper.createCell(THRUST_TO_WT, PdfPCell.BOTTOM));
 322                 motorTable.addCell(ITextHelper.createCell(PROPELLANT_WT, PdfPCell.BOTTOM));
 323                 motorTable.addCell(ITextHelper.createCell(SIZE, PdfPCell.BOTTOM));
 324
 325                 DecimalFormat ttwFormat = new DecimalFormat("0.00");
 326
 327                 MassCalculator massCalc = new BasicMassCalculator();
 328
 329                 Configuration config = new Configuration(rocket);
 330                 config.setMotorConfigurationID(motorId);
 331
 332                 int totalMotorCount = 0;
 333                 double totalPropMass = 0;
 334                 double totalImpulse = 0;
 335                 double totalTTW = 0;
 336
 337                 int stage = 0;
 338                 double stageMass = 0;
 339
 340                 boolean topBorder = false;
 341                 for (RocketComponent c : rocket) {
 342
 343                         if (c instanceof Stage) {
 344                                 config.setToStage(stage);
 345                                 stage++;
 346                                 stageMass = massCalc.getCG(config, MassCalcType.LAUNCH_MASS).weight;
 347                                 // Calculate total thrust-to-weight from only lowest stage motors
 348                                 totalTTW = 0;
 349                                 topBorder = true;
 350                         }
 351
 352                         if (c instanceof MotorMount && ((MotorMount) c).isMotorMount()) {
 353                                 MotorMount mount = (MotorMount) c;
 354
 355                                 if (mount.isMotorMount() && mount.getMotor(motorId) != null) {
 356                                         Motor motor = mount.getMotor(motorId);
 357                                         int motorCount = c.toAbsolute(Coordinate.NUL).length;
 358
 359
 360                                         int border = Rectangle.NO_BORDER;
 361                                         if (topBorder) {
 362                                                 border = Rectangle.TOP;
 363                                                 topBorder = false;
 364                                         }
 365
 366                                         String name = motor.getDesignation();
 367                                         if (motorCount > 1) {
 368                                                 name += " (" + Chars.TIMES + motorCount + ")";
 369                                         }
 370
 371                                         final PdfPCell motorVCell = ITextHelper.createCell(name, border);
 372                                         motorVCell.setPaddingLeft(mPad);
 373                                         motorTable.addCell(motorVCell);
 374                                         motorTable.addCell(ITextHelper.createCell(
 375                                                         UnitGroup.UNITS_FORCE.getDefaultUnit().toStringUnit(motor.getAverageThrustEstimate()), border));
 376                                         motorTable.addCell(ITextHelper.createCell(
 377                                                         UnitGroup.UNITS_FLIGHT_TIME.getDefaultUnit().toStringUnit(motor.getBurnTimeEstimate()), border));
 378                                         motorTable.addCell(ITextHelper.createCell(
 379                                                         UnitGroup.UNITS_FORCE.getDefaultUnit().toStringUnit(motor.getMaxThrustEstimate()), border));
 380                                         motorTable.addCell(ITextHelper.createCell(
 381                                                         UnitGroup.UNITS_IMPULSE.getDefaultUnit().toStringUnit(motor.getTotalImpulseEstimate()), border));
 382
 383                                         double ttw = motor.getAverageThrustEstimate() / (stageMass * GRAVITY_CONSTANT);
 384                                         motorTable.addCell(ITextHelper.createCell(
 385                                                         ttwFormat.format(ttw) + ":1", border));
 386
 387                                         double propMass = (motor.getLaunchCG().weight - motor.getEmptyCG().weight);
 388                                         motorTable.addCell(ITextHelper.createCell(
 389                                                         UnitGroup.UNITS_MASS.getDefaultUnit().toStringUnit(propMass), border));
 390
 391                                         final Unit motorUnit = UnitGroup.UNITS_MOTOR_DIMENSIONS.getDefaultUnit();
 392                                         motorTable.addCell(ITextHelper.createCell(motorUnit.toString(motor.getDiameter()) +
 393                                                                                                                                 "/" +
 394                                                                                                                                 motorUnit.toString(motor.getLength()) + " " +
 395                                                                                                                                 motorUnit.toString(), border));
 396
 397                                         // Sum up total count
 398                                         totalMotorCount += motorCount;
 399                                         totalPropMass += propMass * motorCount;
 400                                         totalImpulse += motor.getTotalImpulseEstimate() * motorCount;
 401                                         totalTTW += ttw * motorCount;
 402                                 }
 403                         }
 404                 }
 405
 406                 if (totalMotorCount > 1) {
 407                         int border = Rectangle.TOP;
 408                         final PdfPCell motorVCell = ITextHelper.createCell("Total:", border);
 409                         motorVCell.setPaddingLeft(mPad);
 410                         motorTable.addCell(motorVCell);
 411                         motorTable.addCell(ITextHelper.createCell("", border));
 412                         motorTable.addCell(ITextHelper.createCell("", border));
 413                         motorTable.addCell(ITextHelper.createCell("", border));
 414                         motorTable.addCell(ITextHelper.createCell(
 415                                                 UnitGroup.UNITS_IMPULSE.getDefaultUnit().toStringUnit(totalImpulse), border));
 416                         motorTable.addCell(ITextHelper.createCell(
 417                                         ttwFormat.format(totalTTW) + ":1", border));
 418                         motorTable.addCell(ITextHelper.createCell(
 419                                                 UnitGroup.UNITS_MASS.getDefaultUnit().toStringUnit(totalPropMass), border));
 420                         motorTable.addCell(ITextHelper.createCell("", border));
 421
 422                 }
 423
 424                 PdfPCell c = new PdfPCell(motorTable);
 425                 c.setBorder(PdfPCell.LEFT);
 426                 c.setBorderWidthTop(0f);
 427                 parent.addCell(c);
 428         }
 429
 430
 431         /**
 432          * Add the motor data for a motor configuration to the table.
 433          *
 434          * @param theRocket the rocket
 435          * @param motorId   a motor configuration id
 436          * @param parent    the parent to which the motor data will be added
 437          * @param leading   the number of points for the leading
 438          */
 439         private void addFlightData(final Rocket theRocket, final String motorId, final PdfPTable parent, int leading) {
 440
 441                 // Perform flight simulation
 442                 Rocket duplicate = theRocket.copyWithOriginalID();
 443                 FlightData flight = null;
 444                 try {
 445                         Simulation simulation = ((SwingPreferences)Application.getPreferences()).getBackgroundSimulation(duplicate);
 446                         simulation.getOptions().setMotorConfigurationID(motorId);
 447                         simulation.simulate();
 448                         flight = simulation.getSimulatedData();
 449                 } catch (SimulationException e1) {
 450                         // Ignore
 451                 }
 452
 453                 // Output the flight data
 454                 if (flight != null) {
 455                         try {
 456                                 final Unit distanceUnit = UnitGroup.UNITS_DISTANCE.getDefaultUnit();
 457                                 final Unit velocityUnit = UnitGroup.UNITS_VELOCITY.getDefaultUnit();
 458                                 final Unit flightTimeUnit = UnitGroup.UNITS_FLIGHT_TIME.getDefaultUnit();
 459
 460                                 PdfPTable labelTable = new PdfPTable(2);
 461                                 labelTable.setWidths(new int[] { 3, 2 });
 462                                 final Paragraph chunk = ITextHelper.createParagraph(stripBrackets(
 463                                                         theRocket.getMotorConfigurationNameOrDescription(motorId)), PrintUtilities.BOLD);
 464                                 chunk.setLeading(leading);
 465                                 chunk.setSpacingAfter(3f);
 466
 467                                 document.add(chunk);
 468
 469                                 final PdfPCell cell = ITextHelper.createCell(ALTITUDE, 2, 2);
 470                                 cell.setUseBorderPadding(false);
 471                                 cell.setBorderWidthTop(0f);
 472                                 labelTable.addCell(cell);
 473                                 labelTable.addCell(ITextHelper.createCell(distanceUnit.toStringUnit(flight.getMaxAltitude()), 2, 2));
 474
 475                                 labelTable.addCell(ITextHelper.createCell(FLIGHT_TIME, 2, 2));
 476                                 labelTable.addCell(ITextHelper.createCell(flightTimeUnit.toStringUnit(flight.getFlightTime()), 2, 2));
 477
 478                                 labelTable.addCell(ITextHelper.createCell(TIME_TO_APOGEE, 2, 2));
 479                                 labelTable.addCell(ITextHelper.createCell(flightTimeUnit.toStringUnit(flight.getTimeToApogee()), 2, 2));
 480
 481                                 labelTable.addCell(ITextHelper.createCell(VELOCITY_OFF_PAD, 2, 2));
 482                                 labelTable.addCell(ITextHelper.createCell(velocityUnit.toStringUnit(flight.getLaunchRodVelocity()), 2, 2));
 483
 484                                 labelTable.addCell(ITextHelper.createCell(MAX_VELOCITY, 2, 2));
 485                                 labelTable.addCell(ITextHelper.createCell(velocityUnit.toStringUnit(flight.getMaxVelocity()), 2, 2));
 486
 487                                 labelTable.addCell(ITextHelper.createCell(DEPLOYMENT_VELOCITY, 2,2));
 488                                 labelTable.addCell(ITextHelper.createCell(velocityUnit.toStringUnit(flight.getDeploymentVelocity()),2,2));
 489
 490                                 labelTable.addCell(ITextHelper.createCell(LANDING_VELOCITY, 2, 2));
 491                                 labelTable.addCell(ITextHelper.createCell(velocityUnit.toStringUnit(flight.getGroundHitVelocity()), 2, 2));
 492
 493                                 //Add the table to the parent; have to wrap it in a cell
 494                                 PdfPCell c = new PdfPCell(labelTable);
 495                                 c.setBorder(PdfPCell.RIGHT);
 496                                 c.setBorderWidthTop(0);
 497                                 c.setTop(0);
 498                                 parent.addCell(c);
 499                         } catch (DocumentException e) {
 500                                 log.error("Could not add flight data to document.", e);
 501                         }
 502                 }
 503         }
 504
 505         /**
 506          * Strip [] brackets from a string.
 507          *
 508          * @param target the original string
 509          *
 510          * @return target with [] removed
 511          */
 512         private String stripBrackets(String target) {
 513                 return stripLeftBracket(stripRightBracket(target));
 514         }
 515
 516         /**
 517          * Strip [ from a string.
 518          *
 519          * @param target the original string
 520          *
 521          * @return target with [ removed
 522          */
 523         private String stripLeftBracket(String target) {
 524                 return target.replace("[", "");
 525         }
 526
 527         /**
 528          * Strip ] from a string.
 529          *
 530          * @param target the original string
 531          *
 532          * @return target with ] removed
 533          */
 534         private String stripRightBracket(String target) {
 535                 return target.replace("]", "");
 536         }
 537
 538 }