public Object read()

in jbpm/jbpm-flow-builder/src/main/java/org/jbpm/compiler/xml/core/ExtensibleXmlParser.java [208:324]
95 lines of code
20 McCabe index (conditional complexity)

    public Object read(final InputSource in) throws SAXException,
            IOException {
        if (this.docFragment == null) {
            DocumentBuilderFactory f;
            try {
                f = DocumentBuilderFactory.newInstance();
            } catch (FactoryConfigurationError e) {
                // obscure JDK1.5 bug where FactoryFinder in the JRE returns a null ClassLoader, so fall back to hard coded xerces.
                // https://stg.network.org/bugzilla/show_bug.cgi?id=47169
                // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4633368
                try {
                    f = (DocumentBuilderFactory) Class.forName("org.apache.xerces.jaxp.DocumentBuilderFactoryImpl").newInstance();
                } catch (Exception e1) {
                    throw new RuntimeException("Unable to create new DOM Document",
                            e1);
                }
            } catch (Exception e) {
                throw new RuntimeException("Unable to create new DOM Document",
                        e);
            }
            // XXE protection start
            try {
                f.setFeature("http://xml.org/sax/features/external-general-entities", false);
                f.setFeature("http://xml.org/sax/features/external-parameter-entities", false);

            } catch (ParserConfigurationException e) {
                logger.warn("Unable to set parser features due to {}", e.getMessage());
            }
            // XXE protection end
            try {
                this.document = f.newDocumentBuilder().newDocument();
            } catch (Exception e) {
                throw new RuntimeException("Unable to create new DOM Document",
                        e);
            }
            this.docFragment = this.document.createDocumentFragment();
        }

        SAXParser localParser = null;
        if (this.parser == null) {
            SAXParserFactory factory = null;
            try {
                factory = SAXParserFactory.newInstance();
            } catch (FactoryConfigurationError e) {
                // obscure JDK1.5 bug where FactoryFinder in the JRE returns a null ClassLoader, so fall back to hard coded xerces.
                // https://stg.network.org/bugzilla/show_bug.cgi?id=47169
                // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4633368
                try {
                    factory = (SAXParserFactory) Class.forName("org.apache.xerces.jaxp.SAXParserFactoryImpl").newInstance();
                } catch (Exception e1) {
                    throw new RuntimeException("Unable to create new DOM Document",
                            e1);
                }
            } catch (Exception e) {
                throw new RuntimeException("Unable to create new DOM Document",
                        e);
            }

            factory.setNamespaceAware(true);
            // XXE protection start
            try {
                factory.setFeature("http://xml.org/sax/features/external-general-entities", false);
                factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
                factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);

            } catch (ParserConfigurationException e) {
                logger.warn("Unable to set parser features due to {}", e.getMessage());
            }
            // XXE protection end

            if (System.getProperty("drools.schema.validating") != null) {
                this.isValidating = Boolean.getBoolean("drools.schema.validating");
            }

            if (this.isValidating == true) {
                factory.setValidating(true);
                try {
                    localParser = factory.newSAXParser();
                } catch (final ParserConfigurationException e) {
                    throw new RuntimeException(e.getMessage());
                }

                try {
                    localParser.setProperty(ExtensibleXmlParser.JAXP_SCHEMA_LANGUAGE,
                            ExtensibleXmlParser.W3C_XML_SCHEMA);
                } catch (final SAXNotRecognizedException e) {
                    boolean hideWarnings = Boolean.getBoolean("drools.schema.hidewarnings");
                    if (!hideWarnings) {
                        logger.warn("Your SAX parser is not JAXP 1.2 compliant - turning off validation.");
                    }
                    localParser = null;
                }
            }

            if (localParser == null) {
                // not jaxp1.2 compliant so turn off validation
                try {
                    this.isValidating = false;
                    factory.setValidating(this.isValidating);
                    localParser = factory.newSAXParser();
                } catch (final ParserConfigurationException e) {
                    throw new RuntimeException(e.getMessage());
                }
            }
        } else {
            localParser = this.parser;
        }

        if (!localParser.isNamespaceAware()) {
            throw new RuntimeException("parser must be namespace-aware");
        }

        localParser.parse(in,
                this);

        return this.data;
    }