public static void main()

in apache-rat-tools/src/main/java/org/apache/rat/tools/AntGenerator.java [159:233]
72 lines of code
17 McCabe index (conditional complexity)

    public static void main(final String[] args) throws IOException {
        if (args == null || args.length < 3) {
            System.err.println("At least three arguments are required: package, simple class name, target directory.");
            return;
        }

        String packageName = args[0];
        String className = args[1];
        String destDir = args[2];

        List<AntOption> options = Arg.getOptions().getOptions().stream().filter(ANT_FILTER).map(AntOption::new)
                .collect(Collectors.toList());

        String pkgName = String.join(File.separator, new CasedString(StringCase.DOT, packageName).getSegments());
        File file = new File(new File(new File(destDir), pkgName), className + ".java");
        file.getParentFile().mkdirs();
        try (InputStream template = AntGenerator.class.getResourceAsStream("/Ant.tpl");
             FileWriter writer = new FileWriter(file);
             ByteArrayOutputStream bos = new ByteArrayOutputStream();
             OutputStreamWriter customClasses = new OutputStreamWriter(bos)) {
            if (template == null) {
                throw new RuntimeException("Template /Ant.tpl not found");
            }
            LineIterator iter = IOUtils.lineIterator(new InputStreamReader(template, StandardCharsets.UTF_8));
            while (iter.hasNext()) {
                String line = iter.next();
                switch (line.trim()) {
                    case "${static}":
                        for (Map.Entry<String, String> entry : RENAME_MAP.entrySet()) {
                            writer.append(format("        xlateName.put(\"%s\", \"%s\");%n", entry.getKey(), entry.getValue()));
                        }
                        for (Option option : ANT_FILTER_LIST) {
                            writer.append(format("        unsupportedArgs.add(\"%s\");%n", argsKey(option)));
                        }
                        for (AntOption option : options) {
                            if (option.isDeprecated()) {
                                writer.append(format("        deprecatedArgs.put(\"%s\", \"%s\");%n", argsKey(option.option),
                                        format("Use of deprecated option '%s'. %s", option.getName(), option.getDeprecated())));
                            }
                        }
                        break;
                    case "${methods}":
                        writeMethods(writer, options, customClasses);
                        break;
                    case "${package}":
                        writer.append(format("package %s;%n", packageName));
                        break;
                    case "${constructor}":
                        writer.append(format("    protected %s() {\n" +
                                "        setDeprecationReporter();\n" +
                                "    }%n", className));
                        break;
                    case "${class}":
                        writer.append(format("public abstract class %s extends Task {%n", className));
                        break;
                    case "${classes}":
                        customClasses.flush();
                        customClasses.close();
                        writer.write(bos.toString());
                        break;
                    case "${commonArgs}":
                        try (InputStream argsTpl = MavenGenerator.class.getResourceAsStream("/Args.tpl")) {
                            if (argsTpl == null) {
                                throw new RuntimeException("Args.tpl not found");
                            }
                            IOUtils.copy(argsTpl, writer, StandardCharsets.UTF_8);
                        }
                        break;
                    default:
                        writer.append(line).append(System.lineSeparator());
                        break;
                }
            }
        }
    }