public void service()

in web/src/main/java/org/apache/commons/chain2/web/servlet/ChainProcessor.java [159:203]
37 lines of code
6 McCabe index (conditional complexity)

    public void service(HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException {

        ServletWebContext<String, Object> context =
            new ServletWebContextBase(getServletContext(), request, response);
        Catalog<String, Object, ServletWebContext<String, Object>> theCatalog;

        if (attribute != null) {
            ServletContext servletContext = getServletContext();
            Object testAttribute = servletContext.getAttribute(this.attribute);

            if (testAttribute instanceof Catalog) {
                /* "attribute" should always contain an instance of a
                 * Catalog class according to the historical chain convention.
                 * Although, we now double-check that it is in fact a catalog
                 * here, we still need to suppress warnings because of the
                 * type erasure of generics. */
                @SuppressWarnings("unchecked")
                Catalog<String, Object, ServletWebContext<String, Object>> attributeCatalog =
                     (Catalog<String, Object, ServletWebContext<String, Object>>)testAttribute;
                theCatalog = attributeCatalog;
            } else {
                String msg = "The object stored as the attribute [" +
                        attribute + "] was not of the expected type [" +
                        "Catalog]";
                throw new IllegalArgumentException(msg);
            }
        } else if (catalog != null) {
            theCatalog = CatalogFactoryBase.<String, Object, ServletWebContext<String, Object>>getInstance()
                    .getCatalog(catalog);
        } else {
            theCatalog = CatalogFactoryBase.<String, Object, ServletWebContext<String, Object>>getInstance()
                    .getCatalog();
        }
        if (attribute == null) {
            request.setAttribute(CATALOG_DEFAULT, theCatalog);
        }
        Command<String, Object, ServletWebContext<String, Object>> cmd = theCatalog
                .<Command<String, Object, ServletWebContext<String, Object>>>getCommand(this.command);
        try {
            cmd.execute(context);
        } catch (Exception e) {
            throw new ServletException(e);
        }
    }