src/main/java/org/apache/commons/validator/routines/checkdigit/CASNumberCheckDigit.java [91:136]:
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    @Override
    public String calculate(final String code) throws CheckDigitException {
        if (GenericValidator.isBlankOrNull(code)) {
            throw new CheckDigitException("Code is missing");
        }
        final int modulusResult = INSTANCE.calculateModulus(code, false);
        return toCheckDigit(modulusResult);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isValid(final String code) {
        if (GenericValidator.isBlankOrNull(code)) {
            return false;
        }
        final Object cde = REGEX_VALIDATOR.validate(code);
        if (!(cde instanceof String)) {
            return false;
        }
        try {
            final int modulusResult = INSTANCE.calculateModulus((String) cde, true);
            return modulusResult == Character.getNumericValue(code.charAt(code.length() - 1));
        } catch (final CheckDigitException ex) {
            return false;
        }
    }

    /**
     * Calculates the <em>weighted</em> value of a character in the code at a specified position.
     * <p>
     * CAS numbers are weighted in the following manner:
     * </p>
     * <pre>{@code
     *    right position: 1  2  3  4  5  6  7  8  9 10
     *            weight: 1  2  3  4  5  6  7  8  9  0
     * }</pre>
     *
     * @param charValue The numeric value of the character.
     * @param leftPos The position of the character in the code, counting from left to right
     * @param rightPos The position of the character in the code, counting from right to left
     * @return The weighted value of the character.
     */
    @Override
    protected int weightedValue(final int charValue, final int leftPos, final int rightPos) {
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src/main/java/org/apache/commons/validator/routines/checkdigit/ECNumberCheckDigit.java [79:120]:
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    @Override
    public String calculate(final String code) throws CheckDigitException {
        if (GenericValidator.isBlankOrNull(code)) {
            throw new CheckDigitException("Code is missing");
        }
        final int modulusResult = INSTANCE.calculateModulus(code, false);
        return toCheckDigit(modulusResult);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isValid(final String code) {
        if (GenericValidator.isBlankOrNull(code)) {
            return false;
        }
        final Object cde = REGEX_VALIDATOR.validate(code);
        if (!(cde instanceof String)) {
            return false;
        }
        try {
            final int modulusResult = INSTANCE.calculateModulus((String) cde, true);
            return modulusResult == Character.getNumericValue(code.charAt(code.length() - 1));
        } catch (final CheckDigitException ex) {
            return false;
        }
    }

    /**
     * Calculates the <em>weighted</em> value of a character in the
     * code at a specified position.
     *
     * <p>For EC number digits are weighted by their position from left to right.</p>
     *
     * @param charValue The numeric value of the character.
     * @param leftPos The position of the character in the code, counting from left to right
     * @param rightPos The position of the character in the code, counting from right to left
     * @return The weighted value of the character.
     */
    @Override
    protected int weightedValue(final int charValue, final int leftPos, final int rightPos) {
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