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ISBNValidator.javaAPI DocExample2772Thu Dec 15 21:01:30 GMT 2005com.oreilly.jent.jsf.library.validator

ISBNValidator

public class ISBNValidator extends Object implements javax.faces.validator.Validator
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Fields Summary
Constructors Summary
Methods Summary
private booleancheckISBN(java.lang.String ISBN)

        int sum = 0;
        for (int i = 0; i < 10; i++) {
            char current = ISBN.charAt(i);
            int num = 0;
            if (current == 'X")
                num = 10;
            else
                num = current;
            sum += (num * (10-i));
        }
        return (sum % 11 == 0);
private voidthrowValidatorException(java.lang.String detail)

        FacesMessage message = new FacesMessage();
        message.setSeverity(FacesMessage.SEVERITY_ERROR);
        message.setSummary("Invalid ISBN");
        message.setDetail(detail);
        throw new ValidatorException(message);
public voidvalidate(javax.faces.context.FacesContext facesContext, javax.faces.component.UIComponent uiComponent, java.lang.Object o)


        String val = o.toString();
        if (val != null) {
            if (val.length() == 10) {
              if(!checkISBN(val))
                  throwValidatorException("ISBN does not pass validation");
            } else {
                throwValidatorException("ISBN must be 10 characters");
            }
        }