Launcher.java

   1 package org.argeo.slc.osgiboot;
   2
   3 import java.io.FileInputStream;
   4 import java.io.IOException;
   5 import java.lang.reflect.Method;
   6 import java.util.List;
   7 import java.util.Vector;
   8
   9 import org.eclipse.core.runtime.adaptor.EclipseStarter;
  10 import org.osgi.framework.BundleContext;
  11
  12 public class Launcher {
  13
  14         public static void main(String[] args) {
  15                 // Try to load system properties
  16                 String systemPropertiesFilePath = OsgiBootUtils.getPropertyCompat(
  17                                 OsgiBoot.PROP_ARGEO_OSGI_BOOT_SYSTEM_PROPERTIES_FILE,
  18                                 OsgiBoot.PROP_SLC_OSGIBOOT_SYSTEM_PROPERTIES_FILE);
  19                 if (systemPropertiesFilePath != null) {
  20                         FileInputStream in;
  21                         try {
  22                                 in = new FileInputStream(systemPropertiesFilePath);
  23                                 System.getProperties().load(in);
  24                         } catch (IOException e1) {
  25                                 throw new RuntimeException(
  26                                                 "Cannot load system properties from "
  27                                                                 + systemPropertiesFilePath, e1);
  28                         }
  29                         if (in != null) {
  30                                 try {
  31                                         in.close();
  32                                 } catch (Exception e) {
  33                                         // silent
  34                                 }
  35                         }
  36                 }
  37
  38                 // Start main class
  39                 startMainClass();
  40
  41                 // Start Equinox
  42                 BundleContext bundleContext = null;
  43                 try {
  44                         bundleContext = EclipseStarter.startup(args, null);
  45                 } catch (Exception e) {
  46                         throw new RuntimeException("Cannot start Equinox.", e);
  47                 }
  48
  49                 // OSGi bootstrap
  50                 OsgiBoot osgiBoot = new OsgiBoot(bundleContext);
  51                 osgiBoot.bootstrap();
  52         }
  53
  54         protected static void startMainClass() {
  55                 // Properties config = System.getProperties();
  56                 // String className = config.getProperty("slc.osgiboot.appclass");
  57                 String className = OsgiBootUtils.getPropertyCompat(
  58                                 OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPCLASS,
  59                                 OsgiBoot.PROP_SLC_OSGIBOOT_APPCLASS);
  60                 if (className == null)
  61                         return;
  62
  63                 // should use OsgiBootUtils.getPropertyCompat(), but it does not
  64                 // work for "" as default value
  65                 // so no warning displayed if PROP_SLC_OSGIBOOT_APPARGS is used
  66                 // FIXME: change OsgiBootUtils.getPropertyCompat()
  67                 String line = System.getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPARGS,
  68                                 System.getProperty(OsgiBoot.PROP_SLC_OSGIBOOT_APPARGS, ""));
  69
  70                 String[] uiArgs = readArgumentsFromLine(line);
  71
  72                 try {
  73                         // Launch main method using reflection
  74                         Class clss = Class.forName(className);
  75                         Class[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  76                         Object[] mainArgs = { uiArgs };
  77                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  78                         mainMethod.invoke(null, mainArgs);
  79                 } catch (Exception e) {
  80                         throw new RuntimeException("Cannot start main class.", e);
  81                 }
  82
  83         }
  84
  85         /**
  86          * Transform a line into an array of arguments, taking "" as single
  87          * arguments. (nested \" are not supported)
  88          */
  89         private static String[] readArgumentsFromLine(String lineOrig) {
  90
  91                 String line = lineOrig.trim();// remove trailing spaces
  92                 // System.out.println("line=" + line);
  93                 List args = new Vector();
  94                 StringBuffer curr = new StringBuffer("");
  95                 boolean inQuote = false;
  96                 char[] arr = line.toCharArray();
  97                 for (int i = 0; i < arr.length; i++) {
  98                         char c = arr[i];
  99                         switch (c) {
 100                         case '\"':
 101                                 inQuote = !inQuote;
 102                                 break;
 103                         case ' ':
 104                                 if (!inQuote) {// otherwise, no break: goes to default
 105                                         if (curr.length() > 0) {
 106                                                 args.add(curr.toString());
 107                                                 curr = new StringBuffer("");
 108                                         }
 109                                         break;
 110                                 }
 111                         default:
 112                                 curr.append(c);
 113                                 break;
 114                         }
 115                 }
 116
 117                 // Add last arg
 118                 if (curr.length() > 0) {
 119                         args.add(curr.toString());
 120                         curr = null;
 121                 }
 122
 123                 String[] res = new String[args.size()];
 124                 for (int i = 0; i < args.size(); i++) {
 125                         res[i] = args.get(i).toString();
 126                         // System.out.println("res[i]=" + res[i]);
 127                 }
 128                 return res;
 129         }
 130
 131 }