runtime/org.argeo.slc.osgiboot/src/main/java/org/argeo/slc/osgiboot/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.Properties;
   8 import java.util.Vector;
   9
  10 import org.eclipse.core.runtime.adaptor.EclipseStarter;
  11 import org.osgi.framework.BundleContext;
  12
  13 public class Launcher {
  14
  15         public static void main(String[] args) {
  16                 // Try to load system properties
  17                 String systemPropertiesFilePath = System
  18                                 .getProperty(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                 if (className == null)
  58                         return;
  59
  60                 String[] uiArgs = readArgumentsFromLine(config.getProperty(
  61                                 "slc.osgiboot.appargs", ""));
  62                 try {
  63                         // Launch main method using reflection
  64                         Class clss = Class.forName(className);
  65                         Class[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  66                         Object[] mainArgs = { uiArgs };
  67                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  68                         mainMethod.invoke(null, mainArgs);
  69                 } catch (Exception e) {
  70                         throw new RuntimeException("Cannot start main class.", e);
  71                 }
  72
  73         }
  74
  75         /**
  76          * Transform a line into an array of arguments, taking "" as single
  77          * arguments. (nested \" are not supported)
  78          */
  79         private static String[] readArgumentsFromLine(String lineOrig) {
  80
  81                 String line = lineOrig.trim();// remove trailing spaces
  82                 // System.out.println("line=" + line);
  83                 List args = new Vector();
  84                 StringBuffer curr = new StringBuffer("");
  85                 boolean inQuote = false;
  86                 char[] arr = line.toCharArray();
  87                 for (int i = 0; i < arr.length; i++) {
  88                         char c = arr[i];
  89                         switch (c) {
  90                         case '\"':
  91                                 inQuote = !inQuote;
  92                                 break;
  93                         case ' ':
  94                                 if (!inQuote) {// otherwise, no break: goes to default
  95                                         if (curr.length() > 0) {
  96                                                 args.add(curr.toString());
  97                                                 curr = new StringBuffer("");
  98                                         }
  99                                         break;
 100                                 }
 101                         default:
 102                                 curr.append(c);
 103                                 break;
 104                         }
 105                 }
 106
 107                 // Add last arg
 108                 if (curr.length() > 0) {
 109                         args.add(curr.toString());
 110                         curr = null;
 111                 }
 112
 113                 String[] res = new String[args.size()];
 114                 for (int i = 0; i < args.size(); i++) {
 115                         res[i] = args.get(i).toString();
 116                         // System.out.println("res[i]=" + res[i]);
 117                 }
 118                 return res;
 119         }
 120
 121 }