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

   1 package org.argeo.osgi.boot;
   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.eclipse.core.runtime.adaptor.EclipseStarter;
  10 import org.osgi.framework.BundleContext;
  11
  12 /** Command line interface. */
  13 public class Launcher {
  14
  15         public static void main(String[] args) {
  16                 // Try to load system properties
  17                 String systemPropertiesFilePath = getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_SYSTEM_PROPERTIES_FILE);
  18                 if (systemPropertiesFilePath != null) {
  19                         FileInputStream in;
  20                         try {
  21                                 in = new FileInputStream(systemPropertiesFilePath);
  22                                 System.getProperties().load(in);
  23                         } catch (IOException e1) {
  24                                 throw new RuntimeException("Cannot load system properties from " + systemPropertiesFilePath, e1);
  25                         }
  26                         if (in != null) {
  27                                 try {
  28                                         in.close();
  29                                 } catch (Exception e) {
  30                                         // silent
  31                                 }
  32                         }
  33                 }
  34
  35                 // Start main class
  36                 startMainClass();
  37
  38                 // Start Equinox
  39                 BundleContext bundleContext = null;
  40                 try {
  41                         bundleContext = EclipseStarter.startup(args, null);
  42                 } catch (Exception e) {
  43                         throw new RuntimeException("Cannot start Equinox.", e);
  44                 }
  45
  46                 // OSGi bootstrap
  47                 OsgiBoot osgiBoot = new OsgiBoot(bundleContext);
  48                 osgiBoot.bootstrap();
  49         }
  50
  51         protected static void startMainClass() {
  52                 String className = getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPCLASS);
  53                 if (className == null)
  54                         return;
  55
  56                 String line = System.getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPARGS, "");
  57
  58                 String[] uiArgs = readArgumentsFromLine(line);
  59
  60                 try {
  61                         // Launch main method using reflection
  62                         Class<?> clss = Class.forName(className);
  63                         Class<?>[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  64                         Object[] mainArgs = { uiArgs };
  65                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  66                         mainMethod.invoke(null, mainArgs);
  67                 } catch (Exception e) {
  68                         throw new RuntimeException("Cannot start main class.", e);
  69                 }
  70
  71         }
  72
  73         /**
  74          * Transform a line into an array of arguments, taking "" as single
  75          * arguments. (nested \" are not supported)
  76          */
  77         private static String[] readArgumentsFromLine(String lineOrig) {
  78                 String line = lineOrig.trim();// remove trailing spaces
  79                 List<String> args = new ArrayList<String>();
  80                 StringBuffer curr = new StringBuffer("");
  81                 boolean inQuote = false;
  82                 char[] arr = line.toCharArray();
  83                 for (int i = 0; i < arr.length; i++) {
  84                         char c = arr[i];
  85                         switch (c) {
  86                         case '\"':
  87                                 inQuote = !inQuote;
  88                                 break;
  89                         case ' ':
  90                                 if (!inQuote) {// otherwise, no break: goes to default
  91                                         if (curr.length() > 0) {
  92                                                 args.add(curr.toString());
  93                                                 curr = new StringBuffer("");
  94                                         }
  95                                         break;
  96                                 }
  97                         default:
  98                                 curr.append(c);
  99                                 break;
 100                         }
 101                 }
 102
 103                 // Add last arg
 104                 if (curr.length() > 0) {
 105                         args.add(curr.toString());
 106                         curr = null;
 107                 }
 108
 109                 String[] res = new String[args.size()];
 110                 for (int i = 0; i < args.size(); i++) {
 111                         res[i] = args.get(i).toString();
 112                 }
 113                 return res;
 114         }
 115
 116         public static String getProperty(String name, String defaultValue) {
 117                 final String value;
 118                 if (defaultValue != null)
 119                         value = System.getProperty(name, defaultValue);
 120                 else
 121                         value = System.getProperty(name);
 122
 123                 if (value == null || value.equals(""))
 124                         return null;
 125                 else
 126                         return value;
 127         }
 128
 129         public static String getProperty(String name) {
 130                 return getProperty(name, null);
 131         }
 132
 133 }