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

   1 package net.sf.openrocket.file;
   2
   3 import java.io.BufferedInputStream;
   4 import java.io.File;
   5 import java.io.FileInputStream;
   6 import java.io.FileNotFoundException;
   7 import java.io.IOException;
   8 import java.io.InputStream;
   9
  10 import net.sf.openrocket.aerodynamics.WarningSet;
  11 import net.sf.openrocket.document.OpenRocketDocument;
  12
  13
  14 public abstract class RocketLoader {
  15         protected final WarningSet warnings = new WarningSet();
  16
  17
  18         /**
  19          * Loads a rocket from the specified File object.
  20          */
  21         public final OpenRocketDocument load(File source) throws RocketLoadException {
  22                 warnings.clear();
  23                 InputStream stream = null;
  24
  25                 try {
  26
  27                         stream = new BufferedInputStream(new FileInputStream(source));
  28                         return load(stream);
  29
  30                 } catch (FileNotFoundException e) {
  31                         throw new RocketLoadException("File not found: " + source);
  32                 } finally {
  33                         if (stream != null) {
  34                                 try {
  35                                         stream.close();
  36                                 } catch (IOException e) {
  37                                         e.printStackTrace();
  38                                 }
  39                         }
  40                 }
  41         }
  42
  43         /**
  44          * Loads a rocket from the specified InputStream.
  45          */
  46         public final OpenRocketDocument load(InputStream source) throws RocketLoadException {
  47                 warnings.clear();
  48
  49                 try {
  50                         return loadFromStream(source);
  51                 } catch (RocketLoadException e) {
  52                         throw e;
  53                 } catch (IOException e) {
  54                         throw new RocketLoadException("I/O error: " + e.getMessage());
  55                 } catch (Exception e) {
  56                         throw new RocketLoadException("An unknown error occurred.  Please report a bug.", e);
  57                 } catch (Throwable e) {
  58                         throw new RocketLoadException("A serious error occurred and the software may be "
  59                                         + "unstable.  Save your designs and restart OpenRocket.", e);
  60                 }
  61         }
  62
  63
  64
  65         /**
  66          * This method is called by the default implementations of {@link #load(File)}
  67          * and {@link #load(InputStream)} to load the rocket.
  68          *
  69          * @throws RocketLoadException  if an error occurs during loading.
  70          */
  71         protected abstract OpenRocketDocument loadFromStream(InputStream source) throws IOException,
  72                         RocketLoadException;
  73
  74
  75
  76         public final WarningSet getWarnings() {
  77                 return warnings;
  78         }
  79 }