runtime/org.argeo.slc.osgiboot/src/main/java/org/argeo/slc/osgiboot/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.slc.osgiboot;
  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.Properties;
  24 import java.util.Vector;
  25
  26 import org.eclipse.core.runtime.adaptor.EclipseStarter;
  27 import org.osgi.framework.BundleContext;
  28
  29 public class Launcher {
  30
  31         public static void main(String[] args) {
  32                 // Try to load system properties
  33                 String systemPropertiesFilePath = System
  34                                 .getProperty(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                 if (className == null)
  74                         return;
  75
  76                 String[] uiArgs = readArgumentsFromLine(config.getProperty(
  77                                 "slc.osgiboot.appargs", ""));
  78                 try {
  79                         // Launch main method using reflection
  80                         Class clss = Class.forName(className);
  81                         Class[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  82                         Object[] mainArgs = { uiArgs };
  83                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  84                         mainMethod.invoke(null, mainArgs);
  85                 } catch (Exception e) {
  86                         throw new RuntimeException("Cannot start main class.", e);
  87                 }
  88
  89         }
  90
  91         /**
  92          * Transform a line into an array of arguments, taking "" as single
  93          * arguments. (nested \" are not supported)
  94          */
  95         private static String[] readArgumentsFromLine(String lineOrig) {
  96
  97                 String line = lineOrig.trim();// remove trailing spaces
  98                 // System.out.println("line=" + line);
  99                 List args = new Vector();
 100                 StringBuffer curr = new StringBuffer("");
 101                 boolean inQuote = false;
 102                 char[] arr = line.toCharArray();
 103                 for (int i = 0; i < arr.length; i++) {
 104                         char c = arr[i];
 105                         switch (c) {
 106                         case '\"':
 107                                 inQuote = !inQuote;
 108                                 break;
 109                         case ' ':
 110                                 if (!inQuote) {// otherwise, no break: goes to default
 111                                         if (curr.length() > 0) {
 112                                                 args.add(curr.toString());
 113                                                 curr = new StringBuffer("");
 114                                         }
 115                                         break;
 116                                 }
 117                         default:
 118                                 curr.append(c);
 119                                 break;
 120                         }
 121                 }
 122
 123                 // Add last arg
 124                 if (curr.length() > 0) {
 125                         args.add(curr.toString());
 126                         curr = null;
 127                 }
 128
 129                 String[] res = new String[args.size()];
 130                 for (int i = 0; i < args.size(); i++) {
 131                         res[i] = args.get(i).toString();
 132                         // System.out.println("res[i]=" + res[i]);
 133                 }
 134                 return res;
 135         }
 136
 137 }