source: trunk/JFCMonitor/src/de/ugoe/cs/eventbench/jfcmonitor/JarLauncher.java @ 263

package de.ugoe.cs.eventbench.jfcmonitor;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;

// TODO decent exception handling; currently no exception are caught!
public class JarLauncher {
        
        String workingDir = System.getProperty("user.dir") + "/";
        String jarfile;
        String[] args;
        
        String[] classPath = new String[]{};
        String mainClassName = "";
        ClassLoader costumClassLoader;
        
        public JarLauncher(String jarfile, String[] args) {
                this.jarfile = jarfile;
                this.args = args;
        }

        public void exec() throws FileNotFoundException, IOException, ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, InterruptedException {
                getInfoFromJar();
                initClassLoader();
                startSUT();
        }
        
        private void getInfoFromJar() throws FileNotFoundException, IOException {
                JarInputStream jarInputStream = new JarInputStream(new FileInputStream(workingDir+jarfile));
                Manifest manifest = jarInputStream.getManifest();
                mainClassName = manifest.getMainAttributes().getValue("Main-Class");
                String jarClassPath = manifest.getMainAttributes().getValue("Class-Path");
                String[] jarClassPathElements = jarClassPath.split(" ");
                classPath = new String[jarClassPathElements.length];
                for (int i=0; i<jarClassPathElements.length ; i++) {
                        classPath[i] = "file:"+workingDir+jarClassPathElements[i];
                }
        }
        
        private void initClassLoader() throws MalformedURLException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
                URLClassLoader classLoader = (URLClassLoader) ClassLoader
                                .getSystemClassLoader();
                Method method= URLClassLoader.class.getDeclaredMethod("addURL", new Class[] { URL.class });
                method.setAccessible(true);
                
                method.invoke(classLoader, new Object[]{new URL("file:"+workingDir+jarfile)});
                
                for (String element : classPath) {
                        method.invoke(classLoader, new Object[]{new URL(element)});
                }
        }
        
        private void startSUT() throws ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, InterruptedException {
                Class<?> mainClass = Class.forName(mainClassName);
                Method mainMethod = mainClass.getMethod("main", new Class[]{String[].class});
                mainMethod.invoke(null, new Object[]{args});
        }
}