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public interface CheckDigit
Check Digit calculation and validation.
The logic for validating check digits has previously been
embedded within the logic for specific code validation, which
includes other validations such as verifying the format
or length of a code. CheckDigit
provides for separating out
the check digit calculation logic enabling it to be more easily
tested and reused.
Although Commons Validator is primarily concerned with validation,
CheckDigit
also defines behaviour for calculating/generating check
digits, since it makes sense that users will want to (re-)use the
same logic for both. The ISBNValidator
makes specific use of this feature by providing the facility to validate ISBN-10 codes
and then convert them to the new ISBN-13 standard.
CheckDigit
is used by the new generic
CodeValidator implementation.
CodeValidator
Method Summary | |
---|---|
String |
calculate(String code)
Calculate the Check Digit for a code. |
boolean |
isValid(String code)
Validate the check digit for the code. |
Method Detail |
---|
String calculate(String code) throws CheckDigitException
code
- The code to calculate the Check Digit for.
CheckDigitException
- if an error occurs.boolean isValid(String code)
code
- The code to validate.
true
if the check digit is valid, otherwise
false
.
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