protected boolean doStart()

in src/main/java/org/apache/sling/launchpad/app/Main.java [347:423]
61 lines of code
8 McCabe index (conditional complexity)

    protected boolean doStart(final URL launcherJar) {

        // prevent duplicate start
        if ( this.started) {
            info("Apache Sling has already been started", null);
            return true;
        }

        info("Starting Apache Sling in " + slingHome, null);
        this.started = true;

        Loader loaderTmp = null;
        try {
            final File launchpadHome = getLaunchpadHome(slingHome,
                commandLineArgs);
            loaderTmp = new Loader(launchpadHome) {
                @Override
                protected void info(String msg) {
                    Main.info(msg, null);
                }
            };
        } catch (IllegalArgumentException iae) {
            error(
                "Cannot launch: Launchpad folder cannot be used: "
                    + iae.getMessage(), null);
            return false;
        }
        this.loader = loaderTmp;

        if (launcherJar != null) {
            try {
                loader.installLauncherJar(launcherJar);
            } catch (IOException ioe) {
                error("Cannot launch: Cannot install " + launcherJar
                    + " for use", ioe);
                return false;
            }
        } else {
            info("No Launcher JAR to install", null);
        }

        Object object = null;
        try {
            object = loader.loadLauncher(SharedConstants.DEFAULT_SLING_MAIN);
        } catch (IllegalArgumentException iae) {
            error("Cannot launch: Failed loading Sling class "
                + SharedConstants.DEFAULT_SLING_MAIN, iae);
            return false;
        }

        if (object instanceof Launcher) {

            // configure the launcher
            Launcher sling = (Launcher) object;
            sling.setNotifiable(new Notified());
            sling.setCommandLine(commandLineArgs);
            sling.setSlingHome(slingHome);

            // launch it
            info("Starting launcher ...", null);
            if (sling.start()) {
                info("Startup completed", null);
                this.sling = sling;
                addShutdownHook();
                return true;
            }

            error("Cannot launch: Launcher.start() returned false", null);

        } else {

            error("Cannot launch: Class " + SharedConstants.DEFAULT_SLING_MAIN + " is not a Launcher class", null);

        }

        return false;
    }