public static void main()

in src/main/java/org/apache/xmlbeans/impl/tool/TypeHierarchyPrinter.java [57:239]
147 lines of code
36 McCabe index (conditional complexity)

    public static void main(String[] args) throws Exception
    {
        Set<String> flags = new HashSet<>();
        flags.add("h");
        flags.add("help");
        flags.add("usage");
        flags.add("license");
        flags.add("version");
        flags.add("noanon");
        flags.add("noupr");
        flags.add("noupa");
        flags.add("partial");

        CommandLine cl = new CommandLine(args, flags, Collections.EMPTY_SET);
        if (cl.getOpt("h") != null || cl.getOpt("help") != null || cl.getOpt("usage") != null)
        {
            printUsage();
            System.exit(0);
            return;
        }

        String[] badopts = cl.getBadOpts();
        if (badopts.length > 0)
        {
            for (int i = 0; i < badopts.length; i++)
                System.out.println("Unrecognized option: " + badopts[i]);
            printUsage();
            System.exit(0);
            return;
        }

        if (cl.getOpt("license") != null)
        {
            CommandLine.printLicense();
            System.exit(0);
            return;
        }

        if (cl.getOpt("version") != null)
        {
            CommandLine.printVersion();
            System.exit(0);
            return;
        }

        if (cl.args().length == 0)
        {
            printUsage();
            return;
        }

        boolean noanon = (cl.getOpt("noanon") != null);
        boolean nopvr = (cl.getOpt("nopvr") != null);
        boolean noupa = (cl.getOpt("noupa") != null);
        boolean partial = (cl.getOpt("partial") != null);

        File[] schemaFiles = cl.filesEndingWith(".xsd");
        File[] jarFiles = cl.filesEndingWith(".jar");

        // step 1: load all the files
        List<XmlObject> sdocs = new ArrayList<>();
        for (int i = 0; i < schemaFiles.length; i++)
        {
            try
            {
                sdocs.add(
                    SchemaDocument.Factory.parse(
                        schemaFiles[i], (new XmlOptions()).setLoadLineNumbers()));
            }
            catch (Exception e)
            {
                System.err.println( schemaFiles[i] + " not loadable: " + e );
            }
        }


        XmlObject[] schemas = sdocs.toArray(new XmlObject[0]);

        // step 2: compile all the schemas
        SchemaTypeLoader linkTo = null;
        SchemaTypeSystem typeSystem;
        Collection<XmlError> compErrors = new ArrayList<>();
        XmlOptions schemaOptions = new XmlOptions();
        schemaOptions.setErrorListener(compErrors);
        schemaOptions.setCompileDownloadUrls();
        if (nopvr)
            schemaOptions.setCompileNoPvrRule();
        if (noupa)
            schemaOptions.setCompileNoUpaRule();
        if (partial)
            schemaOptions.setCompilePartialTypesystem();

        if (jarFiles != null && jarFiles.length > 0)
            linkTo = XmlBeans.typeLoaderForResource(XmlBeans.resourceLoaderForPath(jarFiles));

        try
        {
            typeSystem = XmlBeans.compileXsd(schemas, linkTo, schemaOptions);
        }
        catch (XmlException e)
        {
            System.out.println("Schema invalid:" + (partial ? " couldn't recover from errors" : ""));
            if (compErrors.isEmpty())
                System.out.println(e.getMessage());
            else for (Iterator<XmlError> i = compErrors.iterator(); i.hasNext(); )
                System.out.println(i.next());
            return;
        }

        // step 2.5: recovered from errors, print out errors
        if (partial && !compErrors.isEmpty())
        {
            System.out.println("Schema invalid: partial schema type system recovered");
            for (Iterator<XmlError> i = compErrors.iterator(); i.hasNext(); )
                System.out.println(i.next());
        }

        // step 3: go through all the types, and note their base types and namespaces
        Map<String, String> prefixes = new HashMap<>();
        prefixes.put("http://www.w3.org/XML/1998/namespace", "xml");
        prefixes.put("http://www.w3.org/2001/XMLSchema", "xs");
        System.out.println("xmlns:xs=\"http://www.w3.org/2001/XMLSchema\"");

        // This will be a map of (base SchemaType -> Collection of directly dervied types)
        Map<SchemaType, Collection<SchemaType>> childTypes = new HashMap<>();

        // breadthfirst traversal of the type containment tree
        List<SchemaType> allSeenTypes = new ArrayList<>();
        allSeenTypes.addAll(Arrays.asList(typeSystem.documentTypes()));
        allSeenTypes.addAll(Arrays.asList(typeSystem.attributeTypes()));
        allSeenTypes.addAll(Arrays.asList(typeSystem.globalTypes()));

        for (int i = 0; i < allSeenTypes.size(); i++)
        {
            SchemaType sType = allSeenTypes.get(i);

            // recurse through nested anonymous types as well
            if (!noanon)
                allSeenTypes.addAll(Arrays.asList(sType.getAnonymousTypes()));

            // we're not interested in document types, attribute types, or chasing the base type of anyType
            if (sType.isDocumentType() || sType.isAttributeType() || sType == XmlObject.type)
                continue;

            // assign a prefix to the namespace of this type if needed
            noteNamespace(prefixes, sType);

            // enter this type in the list of children of its base type
            Collection<SchemaType> children = childTypes.get(sType.getBaseType());
            if (children == null)
            {
                children = new ArrayList<>();
                childTypes.put(sType.getBaseType(), children);

                // the first time a builtin type is seen, add it too (to get a complete tree up to anyType)
                if (sType.getBaseType().isBuiltinType())
                    allSeenTypes.add(sType.getBaseType());
            }
            children.add(sType);
        }

        // step 4: print the tree, starting from xs:anyType (i.e., XmlObject.type)
        List typesToPrint = new ArrayList<>();
        typesToPrint.add(XmlObject.type);
        StringBuilder spaces = new StringBuilder();
        while (!typesToPrint.isEmpty())
        {
            SchemaType sType = (SchemaType)typesToPrint.remove(typesToPrint.size() - 1);
            if (sType == null)
                spaces.setLength(Math.max(0, spaces.length() - 2));
            else
            {
                System.out.println(spaces + "+-" + QNameHelper.readable(sType, prefixes) + notes(sType));
                Collection<SchemaType> children = childTypes.get(sType);
                if (children != null && !children.isEmpty())
                {
                    spaces.append(typesToPrint.isEmpty() || typesToPrint.get(typesToPrint.size() - 1) == null ? "  " : "| ");
                    typesToPrint.add(null);
                    typesToPrint.addAll(children);
                }
            }
        }
    }