Complate String Render in Spring Boot

gistfile1.txt

public class StringRenderer {

    private static final String RENDER_FUNCTION_NAME = "render";

    private final Resource resourceBundle;
    private final ScriptingEngine engine;

    public StringRenderer(Resource resourceBundle, ScriptingEngine engine) {
        this.resourceBundle = resourceBundle;
        this.engine = engine;
    }

    public String renderView(String viewName, Map<String, Object> model) {
        StringWriter writer = new StringWriter();

        this.engine.invoke(
            this.resourceBundle,
            RENDER_FUNCTION_NAME,
            new WriterStream(writer),
            viewName,
            model);

        return writer.toString();
    }

    public String renderView(ModelAndView modelAndView) {
        return renderView(modelAndView.getViewName(), modelAndView.getModel());
    }

    static class WriterStream implements ComplateStream {
        private final BufferedWriter writer;

        WriterStream(Writer writer) {
            this.writer = new BufferedWriter(writer);
        }

        @Override
        public void write(String s) {
            writer.write(s);
        }

        @Override
        public void writeln(String line) {
            writer.write(line);
            writer.newLine();
        }

        @Override
        public void flush() throws IOException {
            writer.flush();
        }
    }
}

@Configuration
@EnableScheduling
class WebConfig implements WebMvcConfigurer {

    @Bean
    public ViewResolver complateViewResolver(@Value("${complate.bundle.path}") Resource complateBundle) {
        return new ComplateViewResolver(scriptingEngine(), complateBundle);
    }

    @Bean
    public StringRenderer stringRenderer(@Value("${complate.bundle.path}") Resource complateBundle) {
        return new StringRenderer(complateBundle, scriptingEngine());
    }

    @Bean
    public ScriptingEngine scriptingEngine() {
        // This showcases how java classes can also be used from complate views
        // via Nashorn bindings. In this case "logger" will be available in our views
        final Map<String, Object> bindings = singletonMap("logger", LoggerFactory.getLogger(ComplateView.class));

        return new NashornScriptingBridge(bindings);
    }
}