protected CharSequence callMethod()

in boot/src/main/java/org/netbeans/html/boot/impl/JavaScriptProcesor.java [418:469]
51 lines of code
10 McCabe index (conditional complexity)

        protected CharSequence callMethod(String ident, boolean promise, String fqn, String method, String params) {
            final TypeElement type = findClass(fqn);
            if (type == null) {
                processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
                    "Callback to non-existing class " + fqn, e
                );
                return "";
            }
            String binName = processingEnv.getElementUtils().getBinaryName(type).toString();
            if (!fqn.equals(binName)) {
                processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
                    "Use binary classname " + binName + " in the callback", e);
            }

            ExecutableElement found = null;
            String paramTypes = null;
            StringBuilder foundParams = new StringBuilder();
            for (Element m : type.getEnclosedElements()) {
                if (m.getKind() != ElementKind.METHOD) {
                    continue;
                }
                if (m.getSimpleName().contentEquals(method)) {
                    paramTypes = findParamTypes((ExecutableElement)m);
                    if (paramTypes.equals(params)) {
                        found = (ExecutableElement) m;
                        break;
                    }
                    foundParams.append(paramTypes).append("\n");
                }
            }
            if (found == null) {
                if (foundParams.length() == 0) {
                    processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
                        "Callback to class " + fqn + " with unknown method " + method, e
                    );
                } else {
                    processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
                        "Callback to " + fqn + "." + method + " with wrong parameters: " +
                        params + ". Only known parameters are " + foundParams, e
                    );
                }
            } else {
                Map<String,ExecutableElement> mangledOnes = javacalls.get(findPkg(e));
                if (mangledOnes == null) {
                    mangledOnes = new TreeMap<>();
                    javacalls.put(findPkg(e), mangledOnes);
                }
                String mangled = JsCallback.mangle(fqn, method, paramTypes);
                mangledOnes.put(mangled, found);
            }
            return "";
        }