List evaluate()

in core/src/main/java/org/apache/stormcrawler/parse/filter/XPathFilter.java [98:152]
51 lines of code
12 McCabe index (conditional complexity)

        List<String> evaluate(DocumentFragment doc) throws XPathExpressionException, IOException {
            Object evalResult = expression.evaluate(doc, evalFunction.getReturnType());
            List<String> values = new LinkedList<>();
            switch (evalFunction) {
                case STRING:
                    if (evalResult != null) {
                        String strippedValue = StringUtils.strip((String) evalResult);
                        values.add(strippedValue);
                    }
                    break;
                case SERIALIZE:
                    NodeList nodesToSerialize = (NodeList) evalResult;
                    StringWriter out = new StringWriter();
                    OutputFormat format = new OutputFormat(Method.XHTML, null, false);
                    format.setOmitXMLDeclaration(true);
                    XMLSerializer serializer = new XMLSerializer(out, format);
                    for (int i = 0; i < nodesToSerialize.getLength(); i++) {
                        Node node = nodesToSerialize.item(i);
                        switch (node.getNodeType()) {
                            case Node.ELEMENT_NODE:
                                serializer.serialize((Element) node);
                                break;
                            case Node.DOCUMENT_NODE:
                                serializer.serialize((Document) node);
                                break;
                            case Node.DOCUMENT_FRAGMENT_NODE:
                                serializer.serialize((DocumentFragment) node);
                                break;
                            case Node.TEXT_NODE:
                                String text = node.getTextContent();
                                if (text.length() > 0) {
                                    values.add(text);
                                }
                                // By pass the rest of the code since it is used to
                                // extract
                                // the value out of the serialized which isn't used in
                                // this case
                                continue;
                        }
                        String serializedValue = out.toString();
                        if (serializedValue.length() > 0) {
                            values.add(serializedValue);
                        }
                        out.getBuffer().setLength(0);
                    }
                    break;
                default:
                    NodeList nodes = (NodeList) evalResult;
                    for (int i = 0; i < nodes.getLength(); i++) {
                        Node node = nodes.item(i);
                        values.add(StringUtils.strip(node.getTextContent()));
                    }
            }
            return values;
        }