git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/util/JarUtil.java

   1 package net.sf.openrocket.util;
   2
   3 import java.io.File;
   4 import java.net.URI;
   5 import java.net.URISyntaxException;
   6 import java.net.URL;
   7 import java.security.CodeSource;
   8
   9 import net.sf.openrocket.database.Database;
  10
  11 public class JarUtil {
  12
  13         /**
  14          * Return the a File object pointing to the JAR file that this class belongs to,
  15          * or <code>null</code> if it cannot be found.
  16          *
  17          * @return      a File object of the current Java archive, or <code>null</code>
  18          */
  19         public static File getCurrentJarFile() {
  20                 // Find the jar file this class is contained in
  21
  22                 URL jarUrl = null;
  23                 CodeSource codeSource;
  24                 try {
  25                         codeSource = new URL("rsrc:.").openConnection().getClass().getProtectionDomain().getCodeSource();
  26                 } catch (Throwable e) {
  27                         codeSource = Database.class.getProtectionDomain().getCodeSource();
  28                 }
  29
  30                 if (codeSource != null)
  31                         jarUrl = codeSource.getLocation();
  32
  33                 if (jarUrl == null) {
  34                         return null;
  35                 }
  36
  37                 File file = urlToFile(jarUrl);
  38                 if (file.isFile())
  39                         return file;
  40                 return null;
  41         }
  42
  43
  44
  45         public static File urlToFile(URL url) {
  46                 URI uri;
  47                 try {
  48                         uri = url.toURI();
  49                 } catch (URISyntaxException e) {
  50                         try {
  51                                 uri = new URI(url.getProtocol(), url.getUserInfo(), url.getHost(),
  52                                                 url.getPort(), url.getPath(), url.getQuery(), url.getRef());
  53                         } catch (URISyntaxException e1) {
  54                                 throw new IllegalArgumentException("Broken URL: " + url);
  55                         }
  56                 }
  57                 return new File(uri);
  58         }
  59
  60
  61 }