org.argeo.osgi.boot/src/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.ArrayList;
  22 import java.util.List;
  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 = getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_SYSTEM_PROPERTIES_FILE);
  33                 if (systemPropertiesFilePath != null) {
  34                         FileInputStream in;
  35                         try {
  36                                 in = new FileInputStream(systemPropertiesFilePath);
  37                                 System.getProperties().load(in);
  38                         } catch (IOException e1) {
  39                                 throw new RuntimeException("Cannot load system properties from " + systemPropertiesFilePath, e1);
  40                         }
  41                         if (in != null) {
  42                                 try {
  43                                         in.close();
  44                                 } catch (Exception e) {
  45                                         // silent
  46                                 }
  47                         }
  48                 }
  49
  50                 // Start main class
  51                 startMainClass();
  52
  53                 // Start Equinox
  54                 BundleContext bundleContext = null;
  55                 try {
  56                         bundleContext = EclipseStarter.startup(args, null);
  57                 } catch (Exception e) {
  58                         throw new RuntimeException("Cannot start Equinox.", e);
  59                 }
  60
  61                 // OSGi bootstrap
  62                 OsgiBoot osgiBoot = new OsgiBoot(bundleContext);
  63                 osgiBoot.bootstrap();
  64         }
  65
  66         protected static void startMainClass() {
  67                 String className = getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPCLASS);
  68                 if (className == null)
  69                         return;
  70
  71                 String line = System.getProperty(OsgiBoot.PROP_ARGEO_OSGI_BOOT_APPARGS, "");
  72
  73                 String[] uiArgs = readArgumentsFromLine(line);
  74
  75                 try {
  76                         // Launch main method using reflection
  77                         Class<?> clss = Class.forName(className);
  78                         Class<?>[] mainArgsClasses = new Class[] { uiArgs.getClass() };
  79                         Object[] mainArgs = { uiArgs };
  80                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  81                         mainMethod.invoke(null, mainArgs);
  82                 } catch (Exception e) {
  83                         throw new RuntimeException("Cannot start main class.", e);
  84                 }
  85
  86         }
  87
  88         /**
  89          * Transform a line into an array of arguments, taking "" as single
  90          * arguments. (nested \" are not supported)
  91          */
  92         private static String[] readArgumentsFromLine(String lineOrig) {
  93                 String line = lineOrig.trim();// remove trailing spaces
  94                 List<String> args = new ArrayList<String>();
  95                 StringBuffer curr = new StringBuffer("");
  96                 boolean inQuote = false;
  97                 char[] arr = line.toCharArray();
  98                 for (int i = 0; i < arr.length; i++) {
  99                         char c = arr[i];
 100                         switch (c) {
 101                         case '\"':
 102                                 inQuote = !inQuote;
 103                                 break;
 104                         case ' ':
 105                                 if (!inQuote) {// otherwise, no break: goes to default
 106                                         if (curr.length() > 0) {
 107                                                 args.add(curr.toString());
 108                                                 curr = new StringBuffer("");
 109                                         }
 110                                         break;
 111                                 }
 112                         default:
 113                                 curr.append(c);
 114                                 break;
 115                         }
 116                 }
 117
 118                 // Add last arg
 119                 if (curr.length() > 0) {
 120                         args.add(curr.toString());
 121                         curr = null;
 122                 }
 123
 124                 String[] res = new String[args.size()];
 125                 for (int i = 0; i < args.size(); i++) {
 126                         res[i] = args.get(i).toString();
 127                 }
 128                 return res;
 129         }
 130
 131         public static String getProperty(String name, String defaultValue) {
 132                 final String value;
 133                 if (defaultValue != null)
 134                         value = System.getProperty(name, defaultValue);
 135                 else
 136                         value = System.getProperty(name);
 137
 138                 if (value == null || value.equals(""))
 139                         return null;
 140                 else
 141                         return value;
 142         }
 143
 144         public static String getProperty(String name) {
 145                 return getProperty(name, null);
 146         }
 147
 148 }