public void showAndWait()

in boot/src/main/java/net/java/html/boot/BrowserBuilder.java [221:361]
130 lines of code
30 McCabe index (conditional complexity)

    public void showAndWait() {
        if (resource == null) {
            throw new NullPointerException("Need to specify resource via loadPage method");
        }
        
        final Class<?> myCls;
        if (clazz != null) {
            myCls = clazz;
        } else if (onLoad != null) {
            myCls = onLoad.getClass();
        } else {
            throw new NullPointerException("loadClass, neither loadFinished was called!");
        }
        IOException mal[] = { null };
        URL url = findLocalizedResourceURL(resource, locale, mal, myCls);
        if (url == null) {
            final IOException ex = new IOException("Cannot find page " + resource + " to display");
            class InvalidHandler extends URLStreamHandler {
                @Override
                protected URLConnection openConnection(URL u) throws IOException {
                    throw ex;
                }
            }
            try {
                url = new URL("resource", null, -1, resource, new InvalidHandler());
            } catch (MalformedURLException malformed) {
                throw new IllegalStateException(malformed);
            }
        }
        
        Fn.Presenter dfnr = null;
        for (Object o : context) {
            if (o instanceof Fn.Presenter) {
                dfnr = (Fn.Presenter)o;
                break;
            }
        }

        if (dfnr == null && loader != null) for (Fn.Presenter o : ServiceLoader.load(Fn.Presenter.class, loader)) {
            dfnr = o;
            break;
        }
        
        if (dfnr == null) for (Fn.Presenter o : ServiceLoader.load(Fn.Presenter.class)) {
            dfnr = o;
            break;
        }
        
        if (dfnr == null) {
            throw new IllegalStateException("Can't find any Fn.Presenter");
        }
        
        final ClassLoader activeLoader;
        if (loader != null) {
            final URL res = FnContext.isJavaScriptCapable(loader);
            if (res != null) {
                throw new IllegalStateException("Loader " + loader + 
                    " cannot resolve @JavaScriptBody, because of " + res
                );
            }
            activeLoader = loader;
        } else {
            final URL res = FnContext.isJavaScriptCapable(myCls.getClassLoader());
            if (res == null) {
                activeLoader = myCls.getClassLoader();
            } else {
                FImpl impl = new FImpl(myCls.getClassLoader());
                activeLoader = FnContext.newLoader(res, impl, dfnr, myCls.getClassLoader().getParent());
                if (activeLoader == null) {
                    throw new IllegalStateException("Cannot find asm-5.0.jar classes!");
                }
            }
        }
        
        final Fn.Presenter dP = dfnr;

        class OnPageLoad implements Runnable {
            @Override
            public void run() {
                try {
                    final Fn.Presenter aP = Fn.activePresenter();
                    final Fn.Presenter currentP = aP != null ? aP : dP;
                    
                    Thread.currentThread().setContextClassLoader(activeLoader);
                    final Class<?> newClazz = onLoad != null ?
                        myCls :
                        Class.forName(myCls.getName(), true, activeLoader);
                    Contexts.Builder cb = Contexts.newBuilder(context);
                    if (!Contexts.fillInByProviders(newClazz, cb)) {
                        LOG.log(Level.WARNING, "Using empty technology for {0}", newClazz);
                    }
                    if (currentP instanceof Executor) {
                        cb.register(Executor.class, (Executor)currentP, 1000);
                    }
                    cb.register(Fn.Presenter.class, currentP, 1000);
                    BrwsrCtx c = cb.build();

                    class CallInitMethod implements Runnable {
                        @Override
                        public void run() {
                            Throwable firstError = null;
                            if (onLoad != null) {
                                try (var ctx = Fn.activate(currentP)) {
                                    onLoad.run();
                                } catch (Throwable ex) {
                                    firstError = ex;
                                }
                            }
                            INIT: if (methodName != null) {
                                if (methodArgs.length == 0) {
                                    try (var ctx = Fn.activate(currentP)) {
                                        Method m = newClazz.getMethod(methodName);
                                        m.invoke(null);
                                        firstError = null;
                                        break INIT;
                                    } catch (Throwable ex) {
                                        firstError = ex;
                                    }
                                }
                                try (var ctx = Fn.activate(currentP)) {
                                    Method m = newClazz.getMethod(methodName, String[].class);
                                    m.invoke(m, (Object) methodArgs);
                                    firstError = null;
                                } catch (Throwable ex) {
                                    LOG.log(Level.SEVERE, "Can't call " + methodName + " with args " + Arrays.toString(methodArgs), ex);
                                }
                            }
                            if (firstError != null) {
                                LOG.log(Level.SEVERE, "Can't initialize the view", firstError);
                            }
                        }
                    }
                    
                    c.execute(new CallInitMethod());
                } catch (ClassNotFoundException ex) {
                    LOG.log(Level.SEVERE, "Can't load " + myCls.getName(), ex);
                }
            }
        }
        dfnr.displayPage(url, new OnPageLoad());
    }