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

   1 package net.sf.openrocket.file.motor;
   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.file.MotorLoader;
  12 import net.sf.openrocket.motor.Manufacturer;
  13 import net.sf.openrocket.motor.Motor;
  14 import net.sf.openrocket.motor.MotorDigest;
  15 import net.sf.openrocket.motor.ThrustCurveMotor;
  16 import net.sf.openrocket.motor.MotorDigest.DataType;
  17 import net.sf.openrocket.util.Coordinate;
  18
  19 public class RASPMotorLoader extends MotorLoader {
  20
  21         public static final String CHARSET_NAME = "ISO-8859-1";
  22
  23         public static final Charset CHARSET = Charset.forName(CHARSET_NAME);
  24
  25
  26
  27
  28         @Override
  29         protected Charset getDefaultCharset() {
  30                 return CHARSET;
  31         }
  32
  33
  34         /**
  35          * Load a <code>Motor</code> from a RASP file specified by the <code>Reader</code>.
  36          * The <code>Reader</code> is responsible for using the correct charset.
  37          * <p>
  38          * The CG is assumed to be located at the center of the motor casing and the mass
  39          * is calculated from the thrust curve by assuming a constant exhaust velocity.
  40          *
  41          * @param reader  the source of the file.
  42          * @return                a list of the {@link Motor} objects defined in the file.
  43          * @throws IOException  if an I/O error occurs or if the file format is illegal.
  44          */
  45         @Override
  46         public List<Motor> load(Reader reader, String filename) throws IOException {
  47                 List<Motor> motors = new ArrayList<Motor>();
  48                 BufferedReader in = new BufferedReader(reader);
  49
  50                 String manufacturer = "";
  51                 String designation = "";
  52                 String comment = "";
  53
  54                 double length = 0;
  55                 double diameter = 0;
  56                 ArrayList<Double> delays = null;
  57
  58                 List<Double> time = new ArrayList<Double>();
  59                 List<Double> thrust = new ArrayList<Double>();
  60
  61                 double propW = 0;
  62                 double totalW = 0;
  63
  64                 try {
  65                         String line;
  66                         String[] pieces, buf;
  67
  68                         line = in.readLine();
  69                         main: while (line != null) {   // Until EOF
  70
  71                                 manufacturer = "";
  72                                 designation = "";
  73                                 comment = "";
  74                                 length = 0;
  75                                 diameter = 0;
  76                                 delays = new ArrayList<Double>();
  77                                 propW = 0;
  78                                 totalW = 0;
  79                                 time.clear();
  80                                 thrust .clear();
  81
  82                                 // Read comment
  83                                 while (line.length()==0 || line.charAt(0)==';') {
  84                                         if (line.length() > 0) {
  85                                                 comment += line.substring(1).trim() + "\n";
  86                                         }
  87                                         line = in.readLine();
  88                                         if (line == null)
  89                                                 break main;
  90                                 }
  91                                 comment = comment.trim();
  92
  93                                 // Parse header line, example:
  94                                 // F32 24 124 5-10-15-P .0377 .0695 RV
  95                                 // desig diam len delays prop.w tot.w manufacturer
  96                                 pieces = split(line);
  97                                 if (pieces.length != 7) {
  98                                         throw new IOException("Illegal file format.");
  99                                 }
 100
 101                                 designation = pieces[0];
 102                                 diameter = Double.parseDouble(pieces[1]) / 1000.0;
 103                                 length = Double.parseDouble(pieces[2]) / 1000.0;
 104
 105                                 if (pieces[3].equalsIgnoreCase("None")) {
 106
 107                                 } else {
 108                                         buf = split(pieces[3],"[-,]+");
 109                                         for (int i=0; i < buf.length; i++) {
 110                                                 if (buf[i].equalsIgnoreCase("P") ||
 111                                                                 buf[i].equalsIgnoreCase("plugged")) {
 112                                                         delays.add(Motor.PLUGGED);
 113                                                 } else {
 114                                                         // Many RASP files have "100" as an only delay
 115                                                         double d = Double.parseDouble(buf[i]);
 116                                                         if (d < 99)
 117                                                                 delays.add(d);
 118                                                 }
 119                                         }
 120                                         Collections.sort(delays);
 121                                 }
 122
 123                                 propW = Double.parseDouble(pieces[4]);
 124                                 totalW = Double.parseDouble(pieces[5]);
 125                                 manufacturer = pieces[6];
 126
 127                                 if (propW > totalW) {
 128                                         throw new IOException("Propellant weight exceeds total weight in " +
 129                                                         "RASP file " + filename);
 130                                 }
 131
 132                                 // Read the data
 133                                 for (line = in.readLine();
 134                                          (line != null) && (line.length()==0 || line.charAt(0) != ';');
 135                                          line = in.readLine()) {
 136
 137                                         buf = split(line);
 138                                         if (buf.length == 0) {
 139                                                 continue;
 140                                         } else if (buf.length == 2) {
 141
 142                                                 time.add(Double.parseDouble(buf[0]));
 143                                                 thrust .add(Double.parseDouble(buf[1]));
 144
 145                                         } else {
 146                                                 throw new IOException("Illegal file format.");
 147                                         }
 148                                 }
 149
 150                                 // Comment of EOF encountered, marks the start of the next motor
 151                                 if (time.size() < 2) {
 152                                         throw new IOException("Illegal file format, too short thrust-curve.");
 153                                 }
 154                                 double[] delayArray = new double[delays.size()];
 155                                 for (int i=0; i<delays.size(); i++) {
 156                                         delayArray[i] = delays.get(i);
 157                                 }
 158                                 motors.add(createRASPMotor(manufacturer, designation, comment,
 159                                                 length, diameter, delayArray, propW, totalW, time, thrust));
 160                         }
 161
 162                 } catch (NumberFormatException e) {
 163
 164                         throw new IOException("Illegal file format.");
 165
 166                 } finally {
 167
 168                         in.close();
 169
 170                 }
 171
 172                 return motors;
 173         }
 174
 175
 176         /**
 177          * Create a motor from RASP file data.
 178          * @throws IOException  if the data is illegal for a thrust curve
 179          */
 180         private static Motor createRASPMotor(String manufacturer, String designation,
 181                         String comment, double length, double diameter, double[] delays,
 182                         double propW, double totalW, List<Double> time, List<Double> thrust)
 183                         throws IOException {
 184
 185                 // Add zero time/thrust if necessary
 186                 sortLists(time, thrust);
 187                 finalizeThrustCurve(time, thrust);
 188                 List<Double> mass = calculateMass(time,thrust,totalW,propW);
 189
 190                 double[] timeArray = new double[time.size()];
 191                 double[] thrustArray = new double[time.size()];
 192                 Coordinate[] cgArray = new Coordinate[time.size()];
 193                 for (int i=0; i < time.size(); i++) {
 194                         timeArray[i] = time.get(i);
 195                         thrustArray[i] = thrust.get(i);
 196                         cgArray[i] = new Coordinate(length/2,0,0,mass.get(i));
 197                 }
 198
 199                 designation = removeDelay(designation);
 200
 201                 // Create the motor digest from data available in RASP files
 202                 MotorDigest motorDigest = new MotorDigest();
 203                 motorDigest.update(DataType.TIME_ARRAY, timeArray);
 204                 motorDigest.update(DataType.MASS_SPECIFIC, totalW, totalW-propW);
 205                 motorDigest.update(DataType.FORCE_PER_TIME, thrustArray);
 206                 final String digest = motorDigest.getDigest();
 207
 208
 209                 try {
 210
 211                         return new ThrustCurveMotor(Manufacturer.getManufacturer(manufacturer),
 212                                         designation, comment, Motor.Type.UNKNOWN,
 213                                         delays, diameter, length, timeArray, thrustArray, cgArray, digest);
 214
 215                 } catch (IllegalArgumentException e) {
 216
 217                         // Bad data read from file.
 218                         throw new IOException("Illegal file format.", e);
 219
 220                 }
 221         }
 222 }