git.gag.com Git - debian/openrocket/blob - src/net/sf/openrocket/file/RASPMotorLoader.java

   1 package net.sf.openrocket.file;
   2
   3 import java.io.BufferedReader;
   4 import java.io.IOException;
   5 import java.io.Reader;
   6 import java.nio.charset.Charset;
   7 import java.util.ArrayList;
   8 import java.util.Collections;
   9 import java.util.List;
  10
  11 import net.sf.openrocket.motor.Manufacturer;
  12 import net.sf.openrocket.motor.Motor;
  13 import net.sf.openrocket.motor.ThrustCurveMotor;
  14 import net.sf.openrocket.util.Coordinate;
  15
  16 public class RASPMotorLoader extends MotorLoader {
  17
  18         public static final String CHARSET_NAME = "ISO-8859-1";
  19
  20         public static final Charset CHARSET = Charset.forName(CHARSET_NAME);
  21
  22
  23
  24
  25         @Override
  26         protected Charset getDefaultCharset() {
  27                 return CHARSET;
  28         }
  29
  30
  31         /**
  32          * Load a <code>Motor</code> from a RASP file specified by the <code>Reader</code>.
  33          * The <code>Reader</code> is responsible for using the correct charset.
  34          * <p>
  35          * The CG is assumed to be located at the center of the motor casing and the mass
  36          * is calculated from the thrust curve by assuming a constant exhaust velocity.
  37          *
  38          * @param reader  the source of the file.
  39          * @return                a list of the {@link Motor} objects defined in the file.
  40          * @throws IOException  if an I/O error occurs or if the file format is illegal.
  41          */
  42         @Override
  43         public List<Motor> load(Reader reader, String filename) throws IOException {
  44                 List<Motor> motors = new ArrayList<Motor>();
  45                 BufferedReader in = new BufferedReader(reader);
  46
  47                 String manufacturer = "";
  48                 String designation = "";
  49                 String comment = "";
  50
  51                 double length = 0;
  52                 double diameter = 0;
  53                 ArrayList<Double> delays = null;
  54
  55                 List<Double> time = new ArrayList<Double>();
  56                 List<Double> thrust = new ArrayList<Double>();
  57
  58                 double propW = 0;
  59                 double totalW = 0;
  60
  61                 try {
  62                         String line;
  63                         String[] pieces, buf;
  64
  65                         line = in.readLine();
  66                         main: while (line != null) {   // Until EOF
  67
  68                                 manufacturer = "";
  69                                 designation = "";
  70                                 comment = "";
  71                                 length = 0;
  72                                 diameter = 0;
  73                                 delays = new ArrayList<Double>();
  74                                 propW = 0;
  75                                 totalW = 0;
  76                                 time.clear();
  77                                 thrust .clear();
  78
  79                                 // Read comment
  80                                 while (line.length()==0 || line.charAt(0)==';') {
  81                                         if (line.length() > 0) {
  82                                                 comment += line.substring(1).trim() + "\n";
  83                                         }
  84                                         line = in.readLine();
  85                                         if (line == null)
  86                                                 break main;
  87                                 }
  88                                 comment = comment.trim();
  89
  90                                 // Parse header line, example:
  91                                 // F32 24 124 5-10-15-P .0377 .0695 RV
  92                                 // desig diam len delays prop.w tot.w manufacturer
  93                                 pieces = split(line);
  94                                 if (pieces.length != 7) {
  95                                         throw new IOException("Illegal file format.");
  96                                 }
  97
  98                                 designation = pieces[0];
  99                                 diameter = Double.parseDouble(pieces[1]) / 1000.0;
 100                                 length = Double.parseDouble(pieces[2]) / 1000.0;
 101
 102                                 if (pieces[3].equalsIgnoreCase("None")) {
 103
 104                                 } else {
 105                                         buf = split(pieces[3],"[-,]+");
 106                                         for (int i=0; i < buf.length; i++) {
 107                                                 if (buf[i].equalsIgnoreCase("P") ||
 108                                                                 buf[i].equalsIgnoreCase("plugged")) {
 109                                                         delays.add(Motor.PLUGGED);
 110                                                 } else {
 111                                                         // Many RASP files have "100" as an only delay
 112                                                         double d = Double.parseDouble(buf[i]);
 113                                                         if (d < 99)
 114                                                                 delays.add(d);
 115                                                 }
 116                                         }
 117                                         Collections.sort(delays);
 118                                 }
 119
 120                                 propW = Double.parseDouble(pieces[4]);
 121                                 totalW = Double.parseDouble(pieces[5]);
 122                                 manufacturer = pieces[6];
 123
 124                                 if (propW > totalW) {
 125                                         throw new IOException("Propellant weight exceeds total weight in " +
 126                                                         "RASP file");
 127                                 }
 128
 129                                 // Read the data
 130                                 for (line = in.readLine();
 131                                          (line != null) && (line.length()==0 || line.charAt(0) != ';');
 132                                          line = in.readLine()) {
 133
 134                                         buf = split(line);
 135                                         if (buf.length == 0) {
 136                                                 continue;
 137                                         } else if (buf.length == 2) {
 138
 139                                                 time.add(Double.parseDouble(buf[0]));
 140                                                 thrust .add(Double.parseDouble(buf[1]));
 141
 142                                         } else {
 143                                                 throw new IOException("Illegal file format.");
 144                                         }
 145                                 }
 146
 147                                 // Comment of EOF encountered, marks the start of the next motor
 148                                 if (time.size() < 2) {
 149                                         throw new IOException("Illegal file format, too short thrust-curve.");
 150                                 }
 151                                 double[] delayArray = new double[delays.size()];
 152                                 for (int i=0; i<delays.size(); i++) {
 153                                         delayArray[i] = delays.get(i);
 154                                 }
 155                                 motors.add(createRASPMotor(manufacturer, designation, comment,
 156                                                 length, diameter, delayArray, propW, totalW, time, thrust));
 157                         }
 158
 159                 } catch (NumberFormatException e) {
 160
 161                         throw new IOException("Illegal file format.");
 162
 163                 } finally {
 164
 165                         in.close();
 166
 167                 }
 168
 169                 return motors;
 170         }
 171
 172
 173         /**
 174          * Create a motor from RASP file data.
 175          * @throws IOException  if the data is illegal for a thrust curve
 176          */
 177         private static Motor createRASPMotor(String manufacturer, String designation,
 178                         String comment, double length, double diameter, double[] delays,
 179                         double propW, double totalW, List<Double> time, List<Double> thrust)
 180                         throws IOException {
 181
 182                 // Add zero time/thrust if necessary
 183                 sortLists(time, thrust);
 184                 finalizeThrustCurve(time, thrust);
 185                 List<Double> mass = calculateMass(time,thrust,totalW,propW);
 186
 187                 double[] timeArray = new double[time.size()];
 188                 double[] thrustArray = new double[time.size()];
 189                 Coordinate[] cgArray = new Coordinate[time.size()];
 190                 for (int i=0; i < time.size(); i++) {
 191                         timeArray[i] = time.get(i);
 192                         thrustArray[i] = thrust.get(i);
 193                         cgArray[i] = new Coordinate(length/2,0,0,mass.get(i));
 194                 }
 195
 196                 designation = removeDelay(designation);
 197
 198                 try {
 199
 200                         return new ThrustCurveMotor(Manufacturer.getManufacturer(manufacturer),
 201                                         designation, comment, Motor.Type.UNKNOWN,
 202                                         delays, diameter, length, timeArray, thrustArray, cgArray);
 203
 204                 } catch (IllegalArgumentException e) {
 205
 206                         // Bad data read from file.
 207                         throw new IOException("Illegal file format.", e);
 208
 209                 }
 210         }
 211 }