org.argeo.init/src/org/argeo/init/osgi/Launcher.java

   1 package org.argeo.init.osgi;
   2
   3 import java.io.FileInputStream;
   4 import java.io.IOException;
   5 import java.lang.reflect.Method;
   6 import java.util.ArrayList;
   7 import java.util.List;
   8
   9 import org.osgi.framework.BundleContext;
  10
  11 /** An OSGi launcher executing first another class in the system class path. */
  12 public class Launcher {
  13
  14         public static void main(String[] args) {
  15                 // Try to load system properties
  16                 String systemPropertiesFilePath = getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_SYSTEM_PROPERTIES_FILE);
  17                 if (systemPropertiesFilePath != null) {
  18                         FileInputStream in;
  19                         try {
  20                                 in = new FileInputStream(systemPropertiesFilePath);
  21                                 System.getProperties().load(in);
  22                         } catch (IOException e1) {
  23                                 throw new RuntimeException("Cannot load system properties from " + systemPropertiesFilePath, e1);
  24                         }
  25                         if (in != null) {
  26                                 try {
  27                                         in.close();
  28                                 } catch (Exception e) {
  29                                         // silent
  30                                 }
  31                         }
  32                 }
  33
  34                 // Start main class
  35                 startMainClass();
  36
  37                 // Start Equinox
  38                 BundleContext bundleContext = null;
  39                 try {
  40                         bundleContext = OsgiBootUtils.launch(OsgiBootUtils.equinoxArgsToConfiguration(args)).getBundleContext();
  41                 } catch (Exception e) {
  42                         throw new RuntimeException("Cannot start Equinox.", e);
  43                 }
  44
  45                 // OSGi bootstrap
  46                 OsgiBoot osgiBoot = new OsgiBoot(bundleContext);
  47                 osgiBoot.bootstrap();
  48         }
  49
  50         protected static void startMainClass() {
  51                 String className = getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPCLASS);
  52                 if (className == null)
  53                         return;
  54
  55                 String line = System.getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPARGS, "");
  56
  57                 String[] uiArgs = readArgumentsFromLine(line);
  58
  59                 try {
  60                         // Launch main method using reflection
  61                         Class<?> clss = Class.forName(className);
  62                         Class<?>[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  63                         Object[] mainArgs = { uiArgs };
  64                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  65                         mainMethod.invoke(null, mainArgs);
  66                 } catch (Exception e) {
  67                         throw new RuntimeException("Cannot start main class.", e);
  68                 }
  69
  70         }
  71
  72         /**
  73          * Transform a line into an array of arguments, taking "" as single arguments.
  74          * (nested \" are not supported)
  75          */
  76         private static String[] readArgumentsFromLine(String lineOrig) {
  77                 String line = lineOrig.trim();// remove trailing spaces
  78                 List<String> args = new ArrayList<String>();
  79                 StringBuffer curr = new StringBuffer("");
  80                 boolean inQuote = false;
  81                 char[] arr = line.toCharArray();
  82                 for (int i = 0; i < arr.length; i++) {
  83                         char c = arr[i];
  84                         switch (c) {
  85                         case '\"':
  86                                 inQuote = !inQuote;
  87                                 break;
  88                         case ' ':
  89                                 if (!inQuote) {// otherwise, no break: goes to default
  90                                         if (curr.length() > 0) {
  91                                                 args.add(curr.toString());
  92                                                 curr = new StringBuffer("");
  93                                         }
  94                                         break;
  95                                 }
  96                         default:
  97                                 curr.append(c);
  98                                 break;
  99                         }
 100                 }
 101
 102                 // Add last arg
 103                 if (curr.length() > 0) {
 104                         args.add(curr.toString());
 105                         curr = null;
 106                 }
 107
 108                 String[] res = new String[args.size()];
 109                 for (int i = 0; i < args.size(); i++) {
 110                         res[i] = args.get(i).toString();
 111                 }
 112                 return res;
 113         }
 114
 115         public static String getProperty(String name, String defaultValue) {
 116                 final String value;
 117                 if (defaultValue != null)
 118                         value = System.getProperty(name, defaultValue);
 119                 else
 120                         value = System.getProperty(name);
 121
 122                 if (value == null || value.equals(""))
 123                         return null;
 124                 else
 125                         return value;
 126         }
 127
 128         public static String getProperty(String name) {
 129                 return getProperty(name, null);
 130         }
 131
 132 }