private static XMLStreamReader getReader()

in src/main/java/org/apache/commons/scxml2/io/SCXMLReader.java [591:685]
80 lines of code
24 McCabe index (conditional complexity)

    private static XMLStreamReader getReader(final Configuration configuration, final URL url, final String path,
                                             final InputStream stream, final Reader reader, final Source source)
            throws IOException, XMLStreamException {

        // Instantiate the XMLInputFactory
        XMLInputFactory factory = XMLInputFactory.newInstance();
        if (configuration.factoryId != null && configuration.factoryClassLoader != null) {
            factory = XMLInputFactory.newFactory(configuration.factoryId, configuration.factoryClassLoader);
        }
        factory.setEventAllocator(configuration.allocator);
        if (factory.isPropertySupported(XMLInputFactory_JDK_PROP_REPORT_CDATA)) {
            factory.setProperty(XMLInputFactory_JDK_PROP_REPORT_CDATA, Boolean.TRUE);
        }
        for (final Map.Entry<String, Object> property : configuration.properties.entrySet()) {
            if (factory.isPropertySupported(property.getKey())) {
                factory.setProperty(property.getKey(), property.getValue());
            }
        }
        factory.setXMLReporter(configuration.reporter);
        factory.setXMLResolver(configuration.resolver);

        // Consolidate InputStream options
        InputStream urlStream = null;
        if (url != null || path != null) {
            final URL scxml = url != null ? url : new URL(path);
            final URLConnection conn = scxml.openConnection();
            conn.setUseCaches(false);
            urlStream = conn.getInputStream();
        } else if (stream != null) {
            urlStream = stream;
        }

        // Create the XMLStreamReader
        XMLStreamReader xsr = null;

        if (configuration.validate) {
            // Validation requires us to use a Source

            final URL scxmlSchema = new URL("TODO"); // TODO, point to appropriate location
            final SchemaFactory schemaFactory = SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema");
            Schema schema;
            try {
                schema = schemaFactory.newSchema(scxmlSchema);
            } catch (final SAXException se) {
                throw new XMLStreamException("Failed to create SCXML Schema for validation", se);
            }

            final Validator validator = schema.newValidator();
            validator.setErrorHandler(new SimpleErrorHandler());

            Source src = null;
            if (urlStream != null) {
                // configuration.encoding is ignored
                if (configuration.systemId != null) {
                    src = new StreamSource(urlStream, configuration.systemId);
                } else {
                    src = new StreamSource(urlStream);
                }
            } else if (reader != null) {
                if (configuration.systemId != null) {
                    src = new StreamSource(reader, configuration.systemId);
                } else {
                    src = new StreamSource(reader);
                }
            } else if (source != null) {
                src = source;
            }
            xsr = factory.createXMLStreamReader(src);
            try {
                validator.validate(src);
            } catch (final SAXException se) {
                throw new XMLStreamException("Failed to create apply SCXML Validator", se);
            }

        } else if (urlStream != null) {
            // systemId gets preference, then encoding if either are present
            if (configuration.systemId != null) {
                xsr = factory.createXMLStreamReader(configuration.systemId, urlStream);
            } else if (configuration.encoding != null) {
                xsr = factory.createXMLStreamReader(urlStream, configuration.encoding);
            } else {
                xsr = factory.createXMLStreamReader(urlStream);
            }
        } else if (reader != null) {
            if (configuration.systemId != null) {
                xsr = factory.createXMLStreamReader(configuration.systemId, reader);
            } else {
                xsr = factory.createXMLStreamReader(reader);
            }
        } else if (source != null) {
            xsr = factory.createXMLStreamReader(source);
        }

        return xsr;
    }