public void process()

in starters/karaf-boot-starter-jpa/src/main/java/org/apache/karaf/boot/jpa/impl/JpaProcessor.java [55:102]
43 lines of code
7 McCabe index (conditional complexity)

    public void process(Writer writer, List<Class<?>> annotatedList) throws Exception {
        Set<String> puNames = new HashSet<String>();
        XMLOutputFactory xof = XMLOutputFactory.newInstance();
        XMLStreamWriter w = new IndentingXMLStreamWriter(xof.createXMLStreamWriter(writer));
        w.setDefaultNamespace("http://java.sun.com/xml/ns/persistence");
        w.writeStartDocument();
        w.writeStartElement("persistence");
        w.writeAttribute("verson", "2.0");

        // w.println("<persistence version=\"2.0\" xmlns=\"http://java.sun.com/xml/ns/persistence\"
        // xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"
        // xsi:schemaLocation=\"http://java.sun.com/xml/ns/persistence
        // http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd\">");
        for (Class<?> annotated : annotatedList) {
            PersistentUnit pu = annotated.getAnnotation(PersistentUnit.class);
            if (pu.name() == null || pu.name().isEmpty()) {
                throw new IOException("Missing persistent unit name");
            }
            if (!puNames.add(pu.name())) {
                throw new IOException("Duplicate persistent unit name: " + pu.name());
            }
            w.writeStartElement("persistence-unit");
            w.writeAttribute("name", pu.name());
            w.writeAttribute("transaction-type", pu.transactionType().toString());
            writeElement(w, "description", pu.description());
            String providerName = getProvider(pu);
            writeElement(w, "provider", providerName);
            writeElement(w, "jta-data-source", pu.jtaDataSource());
            writeElement(w, "non-jta-data-source", pu.nonJtaDataSource());
            Map<String, String> props = new HashMap<>();
            addProperties(pu, props);
            addAnnProperties(annotated, props);
            if (props.size() > 0) {
                w.writeStartElement("properties");
                for (String key : props.keySet()) {
                    w.writeEmptyElement("property");
                    w.writeAttribute("name", key);
                    w.writeAttribute("value", props.get(key));
                }
                w.writeEndElement();
            }
            w.writeEndElement();
        }
        w.writeEndElement();
        w.writeEndDocument();
        w.flush();
        w.close();
    }