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

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.osgi.boot;
  18
  19 import java.io.FileInputStream;
  20 import java.io.IOException;
  21 import java.lang.reflect.Method;
  22 import java.util.List;
  23 import java.util.Vector;
  24
  25 import org.eclipse.core.runtime.adaptor.EclipseStarter;
  26 import org.osgi.framework.BundleContext;
  27
  28 public class Launcher {
  29
  30         public static void main(String[] args) {
  31                 // Try to load system properties
  32                 String systemPropertiesFilePath = OsgiBootUtils.getPropertyCompat(
  33                                 OsgiBoot.PROP_ARGEO_OSGI_BOOT_SYSTEM_PROPERTIES_FILE,
  34                                 OsgiBoot.PROP_SLC_OSGIBOOT_SYSTEM_PROPERTIES_FILE);
  35                 if (systemPropertiesFilePath != null) {
  36                         FileInputStream in;
  37                         try {
  38                                 in = new FileInputStream(systemPropertiesFilePath);
  39                                 System.getProperties().load(in);
  40                         } catch (IOException e1) {
  41                                 throw new RuntimeException(
  42                                                 "Cannot load system properties from "
  43                                                                 + systemPropertiesFilePath, e1);
  44                         }
  45                         if (in != null) {
  46                                 try {
  47                                         in.close();
  48                                 } catch (Exception e) {
  49                                         // silent
  50                                 }
  51                         }
  52                 }
  53
  54                 // Start main class
  55                 startMainClass();
  56
  57                 // Start Equinox
  58                 BundleContext bundleContext = null;
  59                 try {
  60                         bundleContext = EclipseStarter.startup(args, null);
  61                 } catch (Exception e) {
  62                         throw new RuntimeException("Cannot start Equinox.", e);
  63                 }
  64
  65                 // OSGi bootstrap
  66                 OsgiBoot osgiBoot = new OsgiBoot(bundleContext);
  67                 osgiBoot.bootstrap();
  68         }
  69
  70         protected static void startMainClass() {
  71                 // Properties config = System.getProperties();
  72                 // String className = config.getProperty("slc.osgiboot.appclass");
  73                 String className = OsgiBootUtils.getPropertyCompat(
  74                                 OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPCLASS,
  75                                 OsgiBoot.PROP_SLC_OSGIBOOT_APPCLASS);
  76                 if (className == null)
  77                         return;
  78
  79                 // should use OsgiBootUtils.getPropertyCompat(), but it does not
  80                 // work for "" as default value
  81                 // so no warning displayed if PROP_SLC_OSGIBOOT_APPARGS is used
  82                 // FIXME: change OsgiBootUtils.getPropertyCompat()
  83                 String line = System.getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPARGS,
  84                                 System.getProperty(OsgiBoot.PROP_SLC_OSGIBOOT_APPARGS, ""));
  85
  86                 String[] uiArgs = readArgumentsFromLine(line);
  87
  88                 try {
  89                         // Launch main method using reflection
  90                         Class clss = Class.forName(className);
  91                         Class[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  92                         Object[] mainArgs = { uiArgs };
  93                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  94                         mainMethod.invoke(null, mainArgs);
  95                 } catch (Exception e) {
  96                         throw new RuntimeException("Cannot start main class.", e);
  97                 }
  98
  99         }
 100
 101         /**
 102          * Transform a line into an array of arguments, taking "" as single
 103          * arguments. (nested \" are not supported)
 104          */
 105         private static String[] readArgumentsFromLine(String lineOrig) {
 106
 107                 String line = lineOrig.trim();// remove trailing spaces
 108                 // System.out.println("line=" + line);
 109                 List args = new Vector();
 110                 StringBuffer curr = new StringBuffer("");
 111                 boolean inQuote = false;
 112                 char[] arr = line.toCharArray();
 113                 for (int i = 0; i < arr.length; i++) {
 114                         char c = arr[i];
 115                         switch (c) {
 116                         case '\"':
 117                                 inQuote = !inQuote;
 118                                 break;
 119                         case ' ':
 120                                 if (!inQuote) {// otherwise, no break: goes to default
 121                                         if (curr.length() > 0) {
 122                                                 args.add(curr.toString());
 123                                                 curr = new StringBuffer("");
 124                                         }
 125                                         break;
 126                                 }
 127                         default:
 128                                 curr.append(c);
 129                                 break;
 130                         }
 131                 }
 132
 133                 // Add last arg
 134                 if (curr.length() > 0) {
 135                         args.add(curr.toString());
 136                         curr = null;
 137                 }
 138
 139                 String[] res = new String[args.size()];
 140                 for (int i = 0; i < args.size(); i++) {
 141                         res[i] = args.get(i).toString();
 142                         // System.out.println("res[i]=" + res[i]);
 143                 }
 144                 return res;
 145         }
 146
 147 }