public TemplateModel get()

in freemarker-core/src/main/java/freemarker/ext/jdom/NodeListModel.java [353:451]
87 lines of code
26 McCabe index (conditional complexity)

    public TemplateModel get(String key)
    throws TemplateModelException {
        if (isEmpty())
            return EMPTY;

        if (key == null || key.length() == 0)
            throw new TemplateModelException("Invalid key [" + key + "]");

        NodeOperator op = null;
        NamedNodeOperator nop = null;
        String name = null;

        switch (key.charAt(0)) {
            case '@':
                {
                    if (key.length() != 2 || key.charAt(1) != '*') {
                        // Generic attribute key
                        nop = NAMED_ATTRIBUTE_OP;
                        name = key.substring(1);
                    } else
                        // It is @*
                        op = ALL_ATTRIBUTES_OP;

                    break;
                }
            case '*':
                {
                    if (key.length() == 1)
                        op = ALL_CHILDREN_OP;
                    else
                        // Explicitly disallow any other identifier starting with asterisk
                        throw new TemplateModelException("Invalid key [" + key + "]");

                    break;
                }
            case 'x':
            case '_':
                {
                    op = (NodeOperator) OPERATIONS.get(key);
                    if (op == null) {
                        // Some special operation?
                        Integer specop = (Integer) SPECIAL_OPERATIONS.get(key);
                        if (specop != null) {
                            switch (specop.intValue()) {
                                case SPECIAL_OPERATION_COPY:
                                {
                                    synchronized (namespaces) {
                                        return new NodeListModel(nodes, (Map) ((HashMap) namespaces).clone());
                                    }
                                }
                                case SPECIAL_OPERATION_UNIQUE:
                                    return new NodeListModel(removeDuplicates(nodes), namespaces);
                                case SPECIAL_OPERATION_FILTER_NAME:
                                    return new NameFilter();
                                case SPECIAL_OPERATION_FILTER_TYPE:
                                    return new TypeFilter();
                                case SPECIAL_OPERATION_QUERY_TYPE:
                                    return getType();
                                case SPECIAL_OPERATION_REGISTER_NAMESPACE:
                                    return new RegisterNamespace();
                                case SPECIAL_OPERATION_PLAINTEXT:
                                    return getPlainText();
                            }
                        }
                    }
                    break;
                }
        }

        if (op == null && nop == null) {
            nop = NAMED_CHILDREN_OP;
            name = key;
        }

        List list = null;
        if (op != null)
            list = evaluateElementOperation(op, nodes);
        else {
            String localName = name;
            Namespace namespace = Namespace.NO_NAMESPACE;
            int colon = name.indexOf(':');
            if (colon != -1) {
                localName = name.substring(colon + 1);
                String nsPrefix = name.substring(0, colon);
                synchronized (namespaces) {
                    namespace = (Namespace) namespaces.get(nsPrefix);
                }
                if (namespace == null) {
                    if (nsPrefix.equals("xml"))
                        namespace = Namespace.XML_NAMESPACE;
                    else
                        throw new TemplateModelException("Unregistered namespace prefix '" + nsPrefix + "'");
                }
            }

            list = evaluateNamedElementOperation(nop, localName, namespace, nodes);
        }
        return createNodeListModel(list, namespaces);
    }