private boolean parseCommandLine()

in poi-ooxml/src/main/java/org/apache/poi/xslf/util/PPTX2PNG.java [126:281]
147 lines of code
46 McCabe index (conditional complexity)

    private boolean parseCommandLine(String[] args) {
        if (args.length == 0) {
            usage(null);
            return false;
        }

        for (int i = 0; i < args.length; i++) {
            String opt = (i+1 < args.length) ? args[i+1] : null;
            switch (args[i].toLowerCase(Locale.ROOT)) {
                case "-scale":
                    if (opt != null) {
                        scale = Float.parseFloat(opt);
                        i++;
                    }
                    break;
                case "-slide":
                    slidenumStr = opt;
                    i++;
                    break;
                case "-format":
                    format = opt;
                    i++;
                    break;
                case "-outdir":
                    if (opt != null) {
                        outdir = new File(opt);
                        i++;
                    }
                    break;
                case "-outfile":
                    outfile = opt;
                    i++;
                    break;
                case "-outpat":
                    outPattern = opt;
                    i++;
                    break;
                case "-quiet":
                    quiet = true;
                    break;
                case "-dump":
                    if (opt != null) {
                        dumpfile = new File(opt);
                        i++;
                    } else {
                        dumpfile = new File("pptx2png.dump");
                    }
                    break;
                case "-fixside":
                    if (opt != null) {
                        fixSide = opt.toLowerCase(Locale.ROOT);
                        i++;
                    } else {
                        fixSide = "long";
                    }
                    break;
                case "-inputtype":
                    if (opt != null) {
                        defaultFileType = FileMagic.valueOf(opt);
                        i++;
                    } else {
                        defaultFileType = FileMagic.OLE2;
                    }
                    break;
                case "-textasshapes":
                    textAsShapes = true;
                    break;
                case "-ignoreparse":
                    ignoreParse = true;
                    break;
                case "-extractembedded":
                    extractEmbedded = true;
                    break;
                case "-charset":
                    if (opt != null) {
                        charset = Charset.forName(opt);
                        i++;
                    } else {
                        charset = LocaleUtil.CHARSET_1252;
                    }
                    break;
                case "-emfheaderbounds":
                    emfHeaderBounds = true;
                    break;
                case "-fontdir":
                    if (opt != null) {
                        fontDir = opt;
                        i++;
                    } else {
                        fontDir = null;
                    }
                    break;
                case "-fontttf":
                    if (opt != null) {
                        fontTtf = opt;
                        i++;
                    } else {
                        fontTtf = null;
                    }
                    break;
                case "-fontmap":
                    if (opt != null) {
                        fontMap = opt;
                        i++;
                    }  else {
                        fontMap = null;
                    }
                    break;
                default:
                    file = new File(args[i]);
                    break;
            }
        }

        final boolean isStdin = file != null && "stdin".equalsIgnoreCase(file.getName());

        if (!isStdin && (file == null || !file.exists())) {
            usage("File not specified or it doesn't exist");
            return false;
        }

        if (format == null || !format.matches("^(png|gif|jpg|null|svg|pdf|log)$")) {
            usage("Invalid format given");
            return false;
        }

        if (outdir == null) {
            if (isStdin) {
                usage("When reading from STDIN, you need to specify an outdir.");
                return false;
            } else {
                outdir = file.getAbsoluteFile().getParentFile();
            }
        }
        if (!outdir.exists()) {
            usage("Outdir doesn't exist");
            return false;
        }

        if (!"null".equals(format) && (outdir == null || !outdir.exists() || !outdir.isDirectory())) {
            usage("Output directory doesn't exist");
            return false;
        }

        if (scale < 0) {
            usage("Invalid scale given");
            return false;
        }

        if (!"long,short,width,height,scale".contains(fixSide)) {
            usage("<fixside> must be one of long / short / width / height / scale");
            return false;
        }

        return true;
    }