protected List determineActionNamespace()

in plugins/convention/src/main/java/org/apache/struts2/convention/PackageBasedActionConfigBuilder.java [832:898]
51 lines of code
20 McCabe index (conditional complexity)

    protected List<String> determineActionNamespace(Class<?> actionClass) {
        List<String> namespaces = new ArrayList<>();

        // Check if there is a class or package level annotation for the namespace
        //single namespace
        Namespace namespaceAnnotation = AnnotationUtils.findAnnotation(actionClass, Namespace.class);
        if (namespaceAnnotation != null) {
            LOG.trace("Using non-default action namespace from Namespace annotation of [{}]", namespaceAnnotation.value());

            namespaces.add(namespaceAnnotation.value());
        }

        //multiple annotations
        Namespaces namespacesAnnotation = AnnotationUtils.findAnnotation(actionClass, Namespaces.class);
        if (namespacesAnnotation != null) {
            if (LOG.isTraceEnabled()) {
                StringBuilder sb = new StringBuilder();
                for (Namespace namespace : namespacesAnnotation.value())
                    sb.append(namespace.value()).append(",");
                sb.deleteCharAt(sb.length() - 1);
                LOG.trace("Using non-default action namespaces from Namespaces annotation of [{}]", sb.toString());
            }

            for (Namespace namespace : namespacesAnnotation.value()) {
                namespaces.add(namespace.value());
            }
        }

        //don't use default if there are annotations
        if (!namespaces.isEmpty())
            return namespaces;

        String pkg = actionClass.getPackage().getName();
        String pkgPart = null;
        if (actionPackages != null) {
            for (String actionPackage : actionPackages) {
                if (pkg.startsWith(actionPackage)) {
                    pkgPart = actionClass.getName().substring(actionPackage.length() + 1);
                }
            }
        }

        if (pkgPart == null && packageLocators != null) {
            for (String packageLocator : packageLocators) {
                // check subpackage and not a part of package name, eg. actions -> my.actions.transactions - WW-3803
                int index = pkg.lastIndexOf("." + packageLocator + ".");

                // This ensures that the match is at the end, beginning or has a dot on each side of it
                if (index >= 0 && (index + packageLocator.length() == pkg.length() || index == 0 ||
                        (pkg.charAt(index) == '.' && pkg.charAt(index + 1 + packageLocator.length()) == '.'))) {
                    pkgPart = actionClass.getName().substring(index + packageLocator.length() + 2);
                }
            }
        }

        if (pkgPart != null) {
            final int indexOfDot = pkgPart.lastIndexOf('.');
            if (indexOfDot >= 0) {
                String convertedNamespace = actionNameBuilder.build(pkgPart.substring(0, indexOfDot));
                namespaces.add("/" + convertedNamespace.replace('.', '/'));
                return namespaces;
            }
        }

        namespaces.add("");
        return namespaces;
    }