public static Embedded3xLauncher createFromMavenHome()

in src/main/java/org/apache/maven/shared/verifier/Embedded3xLauncher.java [62:118]
45 lines of code
5 McCabe index (conditional complexity)

    public static Embedded3xLauncher createFromMavenHome( String mavenHome, String classworldConf, List<URL> classpath )
        throws LauncherException
    {
        if ( mavenHome == null || mavenHome.length() <= 0 )
        {
            throw new LauncherException( "Invalid Maven home directory " + mavenHome );
        }

        System.setProperty( "maven.home", mavenHome );

        File config;
        if ( classworldConf != null )
        {
            config = new File( classworldConf );
        }
        else
        {
            config = new File( mavenHome, "bin/m2.conf" );
        }

        ClassLoader bootLoader = getBootLoader( mavenHome, classpath );

        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader( bootLoader );
        try
        {
            Class<?> launcherClass = bootLoader.loadClass( "org.codehaus.plexus.classworlds.launcher.Launcher" );

            Object launcher = launcherClass.newInstance();

            Method configure = launcherClass.getMethod( "configure", new Class[] { InputStream.class } );

            configure.invoke( launcher, new Object[] { new FileInputStream( config ) } );

            Method getWorld = launcherClass.getMethod( "getWorld" );
            Object classWorld = getWorld.invoke( launcher );

            Method getMainClass = launcherClass.getMethod( "getMainClass" );
            Class<?> cliClass = (Class<?>) getMainClass.invoke( launcher );

            Constructor<?> newMavenCli = cliClass.getConstructor( new Class[] { classWorld.getClass() } );
            Object mavenCli = newMavenCli.newInstance( new Object[] { classWorld } );

            Class<?>[] parameterTypes = { String[].class, String.class, PrintStream.class, PrintStream.class };
            Method doMain = cliClass.getMethod( "doMain", parameterTypes );

            return new Embedded3xLauncher( mavenCli, doMain );
        }
        catch ( ReflectiveOperationException | IOException e )
        {
            throw new LauncherException( "Failed to initialize Laucher", e );
        }
        finally
        {
            Thread.currentThread().setContextClassLoader( oldClassLoader );
        }
    }