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

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   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 package org.argeo.osgi.boot;
  17
  18 import java.io.FileInputStream;
  19 import java.io.IOException;
  20 import java.lang.reflect.Method;
  21 import java.util.List;
  22 import java.util.Vector;
  23
  24 import org.eclipse.core.runtime.adaptor.EclipseStarter;
  25 import org.osgi.framework.BundleContext;
  26
  27 /** Command line interface. */
  28 public class Launcher {
  29
  30         public static void main(String[] args) {
  31                 // Try to load system properties
  32                 String systemPropertiesFilePath = OsgiBootUtils
  33                                 .getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_SYSTEM_PROPERTIES_FILE);
  34                 if (systemPropertiesFilePath != null) {
  35                         FileInputStream in;
  36                         try {
  37                                 in = new FileInputStream(systemPropertiesFilePath);
  38                                 System.getProperties().load(in);
  39                         } catch (IOException e1) {
  40                                 throw new RuntimeException(
  41                                                 "Cannot load system properties from "
  42                                                                 + systemPropertiesFilePath, e1);
  43                         }
  44                         if (in != null) {
  45                                 try {
  46                                         in.close();
  47                                 } catch (Exception e) {
  48                                         // silent
  49                                 }
  50                         }
  51                 }
  52
  53                 // Start main class
  54                 startMainClass();
  55
  56                 // Start Equinox
  57                 BundleContext bundleContext = null;
  58                 try {
  59                         bundleContext = EclipseStarter.startup(args, null);
  60                 } catch (Exception e) {
  61                         throw new RuntimeException("Cannot start Equinox.", e);
  62                 }
  63
  64                 // OSGi bootstrap
  65                 OsgiBoot osgiBoot = new OsgiBoot(bundleContext);
  66                 osgiBoot.bootstrap();
  67         }
  68
  69         protected static void startMainClass() {
  70                 String className = OsgiBootUtils
  71                                 .getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPCLASS);
  72                 if (className == null)
  73                         return;
  74
  75                 String line = System.getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPARGS,
  76                                 "");
  77
  78                 String[] uiArgs = readArgumentsFromLine(line);
  79
  80                 try {
  81                         // Launch main method using reflection
  82                         Class clss = Class.forName(className);
  83                         Class[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  84                         Object[] mainArgs = { uiArgs };
  85                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  86                         mainMethod.invoke(null, mainArgs);
  87                 } catch (Exception e) {
  88                         throw new RuntimeException("Cannot start main class.", e);
  89                 }
  90
  91         }
  92
  93         /**
  94          * Transform a line into an array of arguments, taking "" as single
  95          * arguments. (nested \" are not supported)
  96          */
  97         private static String[] readArgumentsFromLine(String lineOrig) {
  98                 String line = lineOrig.trim();// remove trailing spaces
  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                 }
 133                 return res;
 134         }
 135
 136 }