Reto semanal

public class Ejecutable {

    public static void main(String[] args) {
        testMethod("0-7475-3269-9", "3-04-013311-X", "304013311X",
                "0747532699", "A0-7475-3269-9", "045747535679", "0000000000");
    }

    public static boolean isISBNCode(final String pCode) {
        boolean result = false;
        if (pCode != null && !pCode.isEmpty()) {
            // Verifico el formato en que viene y lo estandarizo:
            // Si viene con "-" los elimino, si viene con letras no es válido.
            String codeFormat = pCode;
            if (pCode.contains("-")) {
                codeFormat = pCode.replace('-', ' ');
                codeFormat = codeFormat.replaceAll("\\s+", "");
            }
            if (codeFormat.length() == 10
                    && tryParseInt(codeFormat.substring(0,
                            codeFormat.length() - 2))) {
                String lastDigit = String.valueOf(codeFormat.charAt(codeFormat
                        .length() - 1));
                if (tryParseInt(lastDigit)
                        || "X".equals(lastDigit.toUpperCase())) {

                    char[] codeArray = codeFormat.toCharArray();

                    int position = 10;
                    int totalSum = 0;
                    for (char character : codeArray) {
                        if (position != 1) {
                            totalSum = totalSum
                                    + (Integer.parseInt(character + "") * position);
                            position--;
                        } else {
                            // Último dígito, hay que verificar.
                            if ("X".equals(character + "".toUpperCase())) {
                                totalSum = totalSum
                                        + (Integer.parseInt("10") * position);
                            } else {
                                totalSum = totalSum
                                        + (Integer.parseInt(character + "") * position);
                            }
                        }
                    }
                    // Verifico si el totalSum es múltiplo de 11.
                    if (totalSum % 11 == 0) {
                        result = true;
                    }
                }
            }
        }
        return result;
    }

    public static boolean tryParseInt(final String pString) {
        boolean result = false;
        try {
            Integer.parseInt(pString);
            result = true;
        } catch (NumberFormatException exception) {
            result = false;
        }
        return result;
    }

    public static void testMethod(final String... pValues) {
        if (pValues.length > 0) {
            for (String value : pValues) {
                if (isISBNCode(value)) {
                    System.out.println("El código " + value + " es válido.");
                } else {
                    System.out.println("El código " + value + " NO es válido.");
                }
            }
        }
    }