utilvalidate.java

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    public static boolean isNonnegativeInteger(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        try {
            int temp = Integer.parseInt(s);

            if (temp >= 0) return true;
            return false;
        } catch (Exception e) {
            return false;
        }

        // return(isSignedInteger(s, secondArg)
        // &&((isEmpty(s) && secondArg)  ||(parseInt(s) >= 0) ) );
    }

    /** Returns true if string s is an integer < 0. */
    public static boolean isNegativeInteger(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        try {
            int temp = Integer.parseInt(s);

            if (temp < 0) return true;
            return false;
        } catch (Exception e) {
            return false;
        }

        // return(isSignedInteger(s, secondArg)
        // &&((isEmpty(s) && secondArg)  ||(parseInt(s) < 0) ) );
    }

    /** Returns true if string s is an integer <= 0. */
    public static boolean isNonpositiveInteger(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        try {
            int temp = Integer.parseInt(s);

            if (temp <= 0) return true;
            return false;
        } catch (Exception e) {
            return false;
        }

        // return(isSignedInteger(s, secondArg)
        // &&((isEmpty(s) && secondArg)  ||(parseInt(s) <= 0) ) );
    }

    /** True if string s is an unsigned floating point(real) number.
     *
     *  Also returns true for unsigned integers. If you wish
     *  to distinguish between integers and floating point numbers,
     *  first call isInteger, then call isFloat.
     *
     *  Does not accept exponential notation.
     */
    public static boolean isFloat(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        boolean seenDecimalPoint = false;

        if (s.startsWith(decimalPointDelimiter)) return false;

        // Search through string's characters one by one
        // until we find a non-numeric character.
        // When we do, return false; if we don't, return true.
        for (int i = 0; i < s.length(); i++) {
            // Check that current character is number.
            char c = s.charAt(i);

            if (c == decimalPointDelimiter.charAt(0)) {
                if (!seenDecimalPoint)
                    seenDecimalPoint = true;
                else
                    return false;
            } else {
                if (!isDigit(c)) return false;
            }
        }
        // All characters are numbers.
        return true;
    }

    /** True if string s is a signed or unsigned floating point
     *  (real) number. First character is allowed to be + or -.
     *
     *  Also returns true for unsigned integers. If you wish
     *  to distinguish between integers and floating point numbers,
     *  first call isSignedInteger, then call isSignedFloat.
     */
    public static boolean isSignedFloat(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        try {
            float temp = Float.parseFloat(s);

            if (temp <= 0) return true;
            return false;
        } catch (Exception e) {
            return false;
        }

        // int startPos = 0;
        // if(isSignedFloat.arguments.length > 1) secondArg = isSignedFloat.arguments[1];
        // skip leading + or -
        // if((s.charAt(0) == "-") ||(s.charAt(0) == "+") ) startPos = 1;
        // return(isFloat(s.substring(startPos, s.length), secondArg))
    }

    /** True if string s is a signed or unsigned floating point
     *  (real) number. First character is allowed to be + or -.
     *
     *  Also returns true for unsigned integers. If you wish
     *  to distinguish between integers and floating point numbers,
     *  first call isSignedInteger, then call isSignedFloat.
     */
    public static boolean isSignedDouble(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        try {
            double temp = Double.parseDouble(s);

            return true;
        } catch (Exception e) {
            return false;
        }
    }

    /** Returns true if string s is letters only.
     *
     *  NOTE: This should handle i18n version to support European characters, etc.
     *  since it now uses Character.isLetter()
     */
    public static boolean isAlphabetic(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        // Search through string's characters one by one
        // until we find a non-alphabetic character.
        // When we do, return false; if we don't, return true.
        for (int i = 0; i < s.length(); i++) {
            // Check that current character is letter.
            char c = s.charAt(i);

            if (!isLetter(c))
                return false;
        }

        // All characters are letters.
        return true;
    }

    /** Returns true if string s is English letters (A .. Z, a..z) and numbers only.
     *
     *  NOTE: Need i18n version to support European characters.
     *  This could be tricky due to different character
     *  sets and orderings for various languages and platforms.
     */
    public static boolean isAlphanumeric(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        // Search through string's characters one by one
        // until we find a non-alphanumeric character.
        // When we do, return false; if we don't, return true.
        for (int i = 0; i < s.length(); i++) {
            // Check that current character is number or letter.
            char c = s.charAt(i);

            if (!isLetterOrDigit(c)) return false;
        }

        // All characters are numbers or letters.
        return true;
    }

    /* ================== METHODS TO CHECK VARIOUS FIELDS. ==================== */

    /** isSSN returns true if string s is a valid U.S. Social Security Number.  Must be 9 digits. */
    public static boolean isSSN(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        String normalizedSSN = stripCharsInBag(s, SSNDelimiters);

        return (isInteger(normalizedSSN) && normalizedSSN.length() == digitsInSocialSecurityNumber);
    }

    /** isUSPhoneNumber returns true if string s is a valid U.S. Phone Number.  Must be 10 digits. */
    public static boolean isUSPhoneNumber(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

        return (isInteger(normalizedPhone) && normalizedPhone.length() == digitsInUSPhoneNumber);
    }

    /** isUSPhoneAreaCode returns true if string s is a valid U.S. Phone Area Code.  Must be 3 digits. */
    public static boolean isUSPhoneAreaCode(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

        return (isInteger(normalizedPhone) && normalizedPhone.length() == digitsInUSPhoneAreaCode);
    }

    /** isUSPhoneMainNumber returns true if string s is a valid U.S. Phone Main Number.  Must be 7 digits. */
    public static boolean isUSPhoneMainNumber(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

        return (isInteger(normalizedPhone) && normalizedPhone.length() == digitsInUSPhoneMainNumber);
    }

    /** isInternationalPhoneNumber returns true if string s is a valid
     *  international phone number.  Must be digits only; any length OK.
     *  May be prefixed by + character.
     */
    public static boolean isInternationalPhoneNumber(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

        return isPositiveInteger(normalizedPhone);
    }

    /** isZIPCode returns true if string s is a valid U.S. ZIP code.  Must be 5 or 9 digits only. */
    public static boolean isZipCode(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        String normalizedZip = stripCharsInBag(s, ZipCodeDelimiters);

        return (isInteger(normalizedZip) && ((normalizedZip.length() == digitsInZipCode1) || (normalizedZip.length() == digitsInZipCode2)));
    }

    /** Returns true if string s is a valid contiguous U.S. Zip code.  Must be 5 or 9 digits only. */
    public static boolean isContiguousZipCode(String s) {
        boolean retval = false;
        if (isZipCode(s)) {
            if (isEmpty(s)) retval = defaultEmptyOK;
            else {
                String normalizedZip = s.substring(0,5);
                int iZip = Integer.parseInt(normalizedZip);
                if ((iZip >= 96701 && iZip <= 96898) || (iZip >= 99501 && iZip <= 99950)) retval = false;
                else retval = true;
            }
        }
        return retval;
    }

    /** Return true if s is a valid U.S. Postal Code (abbreviation for state). */
    public static boolean isStateCode(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        return ((USStateCodes.indexOf(s) != -1) && (s.indexOf(USStateCodeDelimiter) == -1));
    }

    /** Return true if s is a valid contiguous U.S. Postal Code (abbreviation for state). */
    public static boolean isContiguousStateCode(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        return ((ContiguousUSStateCodes.indexOf(s) != -1) && (s.indexOf(USStateCodeDelimiter) == -1));
    }

    /** Email address must be of form a@b.c -- in other words:
     *  - there must be at least one character before the @
     *  - there must be at least one character before and after the .
     *  - the characters @ and . are both required
     */
    public static boolean isEmail(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        // is s whitespace?
        if (isWhitespace(s)) return false;

        // there must be >= 1 character before @, so we
        // start looking at character position 1
        // (i.e. second character)
        int i = 1;
        int sLength = s.length();

        // look for @
        while ((i < sLength) && (s.charAt(i) != '@')) i++;

        // there must be at least one character after the .
        if ((i >= sLength - 1) || (s.charAt(i) != '@'))
            return false;
        else
            return true;

        // DEJ 2001-10-13 Don't look for '.', some valid emails do not have a dot in the domain name
        // else i += 2;

        // look for .
        // while((i < sLength) && (s.charAt(i) != '.')) i++;
        // there must be at least one character after the .
        // if((i >= sLength - 1) || (s.charAt(i) != '.')) return false;
        // else return true;
    }

    /** isYear returns true if string s is a valid
     *  Year number.  Must be 2 or 4 digits only.
     *
     *  For Year 2000 compliance, you are advised
     *  to use 4-digit year numbers everywhere.
     */
    public static boolean isYear(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        if (!isNonnegativeInteger(s)) return false;
        return ((s.length() == 2) || (s.length() == 4));
    }

    /** isIntegerInRange returns true if string s is an integer
     *  within the range of integer arguments a and b, inclusive.
     */
    public static boolean isIntegerInRange(String s, int a, int b) {
        if (isEmpty(s)) return defaultEmptyOK;
        // Catch non-integer strings to avoid creating a NaN below,
        // which isn't available on JavaScript 1.0 for Windows.
        if (!isSignedInteger(s)) return false;
        // Now, explicitly change the type to integer via parseInt
        // so that the comparison code below will work both on
        // JavaScript 1.2(which typechecks in equality comparisons)
        // and JavaScript 1.1 and before(which doesn't).
        int num = Integer.parseInt(s);

        return ((num >= a) && (num <= b));
    }

    /** isMonth returns true if string s is a valid month number between 1 and 12. */
    public static boolean isMonth(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        return isIntegerInRange(s, 1, 12);
    }

    /** isDay returns true if string s is a valid day number between 1 and 31. */
    public static boolean isDay(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        return isIntegerInRange(s, 1, 31);
    }

    /** Given integer argument year, returns number of days in February of that year. */
    public static int daysInFebruary(int year) {
        // February has 29 days in any year evenly divisible by four,
        // EXCEPT for centurial years which are not also divisible by 400.
        return (((year % 4 == 0) && ((!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28);
    }

    /** isHour returns true if string s is a valid number between 0 and 23. */
    public static boolean isHour(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        return isIntegerInRange(s, 0, 23);
    }

    /** isMinute returns true if string s is a valid number between 0 and 59. */
    public static boolean isMinute(String s) {
        if (isEmpty(s)) return defaultEmptyOK;
        return isIntegerInRange(s, 0, 59);
    }

    /** isSecond returns true if string s is a valid number between 0 and 59. */
    public static boolean isSecond(String s) {