fieldchecks.java

MVC开源框架

                float max = Float.parseFloat(maxVar);
    
                if (min > max) {
                    throw new IllegalArgumentException(sysmsgs.getMessage(
                            "invalid.range", minVar, maxVar));
                }
    
                if (!GenericValidator.isInRange(floatValue, min, max)) {
                    errors.add(field.getKey(),
                        Resources.getActionMessage(validator, request, va, field));
    
                    return false;
                }
            }
        } catch (Exception e) {
            processFailure(errors, field, validator.getFormName(), "floatRange", e);

            return false;
        }

        return true;
    }

    /**
     * Checks if the field is a valid credit card number.
     *
     * @param bean      The bean validation is being performed on.
     * @param va        The <code>ValidatorAction</code> that is currently
     *                  being performed.
     * @param field     The <code>Field</code> object associated with the
     *                  current field being validated.
     * @param errors    The <code>ActionMessages</code> object to add errors
     *                  to if any validation errors occur.
     * @param validator The <code>Validator</code> instance, used to access
     *                  other field values.
     * @param request   Current request object.
     * @return true if valid, false otherwise.
     */
    public static Object validateCreditCard(Object bean, ValidatorAction va,
        Field field, ActionMessages errors, Validator validator,
        HttpServletRequest request) {
        Object result = null;
        String value = null;

        try {
            value = evaluateBean(bean, field);
        } catch (Exception e) {
            processFailure(errors, field, validator.getFormName(), "creditCard", e);
            return Boolean.FALSE;
        }

        if (GenericValidator.isBlankOrNull(value)) {
            return Boolean.TRUE;
        }

        result = GenericTypeValidator.formatCreditCard(value);

        if (result == null) {
            errors.add(field.getKey(),
                Resources.getActionMessage(validator, request, va, field));
        }

        return (result == null) ? Boolean.FALSE : result;
    }

    /**
     * Checks if a field has a valid e-mail address.
     *
     * @param bean      The bean validation is being performed on.
     * @param va        The <code>ValidatorAction</code> that is currently
     *                  being performed.
     * @param field     The <code>Field</code> object associated with the
     *                  current field being validated.
     * @param errors    The <code>ActionMessages</code> object to add errors
     *                  to if any validation errors occur.
     * @param validator The <code>Validator</code> instance, used to access
     *                  other field values.
     * @param request   Current request object.
     * @return True if valid, false otherwise.
     */
    public static boolean validateEmail(Object bean, ValidatorAction va,
        Field field, ActionMessages errors, Validator validator,
        HttpServletRequest request) {
        String value = null;

        try {
            value = evaluateBean(bean, field);
        } catch (Exception e) {
            processFailure(errors, field, validator.getFormName(), "email", e);
            return false;
        }

        if (!GenericValidator.isBlankOrNull(value)
            && !GenericValidator.isEmail(value)) {
            errors.add(field.getKey(),
                Resources.getActionMessage(validator, request, va, field));

            return false;
        } else {
            return true;
        }
    }

    /**
     * Checks if the field's length is less than or equal to the maximum
     * value. A <code>Null</code> will be considered an error.
     *
     * @param bean      The bean validation is being performed on.
     * @param va        The <code>ValidatorAction</code> that is currently
     *                  being performed.
     * @param field     The <code>Field</code> object associated with the
     *                  current field being validated.
     * @param errors    The <code>ActionMessages</code> object to add errors
     *                  to if any validation errors occur.
     * @param validator The <code>Validator</code> instance, used to access
     *                  other field values.
     * @param request   Current request object.
     * @return True if stated conditions met.
     */
    public static boolean validateMaxLength(Object bean, ValidatorAction va,
        Field field, ActionMessages errors, Validator validator,
        HttpServletRequest request) {
        String value = null;

        try {
            value = evaluateBean(bean, field);
            if (value != null) {
                String maxVar =
                    Resources.getVarValue("maxlength", field, validator,
                        request, true);
                int max = Integer.parseInt(maxVar);

                boolean isValid = false;
                String endLth = Resources.getVarValue("lineEndLength", field,
                    validator, request, false);
                if (GenericValidator.isBlankOrNull(endLth)) {
                    isValid = GenericValidator.maxLength(value, max);
                } else {
                    isValid = GenericValidator.maxLength(value, max,
                        Integer.parseInt(endLth));
                }

                if (!isValid) {
                    errors.add(field.getKey(),
                        Resources.getActionMessage(validator, request, va, field));

                    return false;
                }
            }
        } catch (Exception e) {
            processFailure(errors, field, validator.getFormName(), "maxlength", e);

            return false;
        }

        return true;
    }

    /**
     * Checks if the field's length is greater than or equal to the minimum
     * value. A <code>Null</code> will be considered an error.
     *
     * @param bean      The bean validation is being performed on.
     * @param va        The <code>ValidatorAction</code> that is currently
     *                  being performed.
     * @param field     The <code>Field</code> object associated with the
     *                  current field being validated.
     * @param errors    The <code>ActionMessages</code> object to add errors
     *                  to if any validation errors occur.
     * @param validator The <code>Validator</code> instance, used to access
     *                  other field values.
     * @param request   Current request object.
     * @return True if stated conditions met.
     */
    public static boolean validateMinLength(Object bean, ValidatorAction va,
        Field field, ActionMessages errors, Validator validator,
        HttpServletRequest request) {
        String value = null;

        try {
            value = evaluateBean(bean, field);
            if (!GenericValidator.isBlankOrNull(value)) {
                String minVar =
                    Resources.getVarValue("minlength", field, validator,
                        request, true);
                int min = Integer.parseInt(minVar);

                boolean isValid = false;
                String endLth = Resources.getVarValue("lineEndLength", field,
                    validator, request, false);
                if (GenericValidator.isBlankOrNull(endLth)) {
                    isValid = GenericValidator.minLength(value, min);
                } else {
                    isValid = GenericValidator.minLength(value, min,
                        Integer.parseInt(endLth));
                }

                if (!isValid) {
                    errors.add(field.getKey(),
                        Resources.getActionMessage(validator, request, va, field));

                    return false;
                }
            }
        } catch (Exception e) {
            processFailure(errors, field, validator.getFormName(), "minlength", e);

            return false;
        }

        return true;
    }

    /**
     * Checks if a field has a valid url. Four optional variables can be
     * specified to configure url validation.
     *
     * <ul>
     *
     * <li>Variable <code>allow2slashes</code> can be set to <code>true</code>
     * or <code>false</code> to control whether two slashes are allowed -
     * default is <code>false</code> (i.e. two slashes are NOT allowed).</li>
     *
     * <li>Variable <code>nofragments</code> can be set to <code>true</code>
     * or <code>false</code> to control whether fragments are allowed -
     * default is <code>false</code> (i.e. fragments ARE allowed).</li>
     *
     * <li>Variable <code>allowallschemes</code> can be set to
     * <code>true</code> or <code>false</code> to control if all schemes are
     * allowed - default is <code>false</code> (i.e. all schemes are NOT
     * allowed).</li>
     *
     * <li>Variable <code>schemes</code> can be set to a comma delimited list
     * of valid schemes. This value is ignored if <code>allowallschemes</code>
     * is set to <code>true</code>. Default schemes allowed are "http",
     * "https" and "ftp" if this variable is not specified.</li>
     *
     * </ul>
     *
     * @param bean      The bean validation is being performed on.
     * @param va        The <code>ValidatorAction</code> that is currently
     *                  being performed.
     * @param field     The <code>Field</code> object associated with the
     *                  current field being validated.
     * @param errors    The <code>ActionMessages</code> object to add errors
     *                  to if any validation errors occur.
     * @param validator The <code>Validator</code> instance, used to access
     *                  other field values.
     * @param request   Current request object.
     * @return True if valid, false otherwise.
     */
    public static boolean validateUrl(Object bean, ValidatorAction va,
        Field field, ActionMessages errors, Validator validator,
        HttpServletRequest request) {
        String value = null;

        try {
            value = evaluateBean(bean, field);
        } catch (Exception e) {
            processFailure(errors, field, validator.getFormName(), "url", e);
            return false;
        }

        if (GenericValidator.isBlankOrNull(value)) {
            return true;
        }

        // Get the options and schemes Vars
        String allowallschemesVar =
            Resources.getVarValue("allowallschemes", field, validator, request,
                false);
        boolean allowallschemes = "true".equalsIgnoreCase(allowallschemesVar);
        int options = allowallschemes ? UrlValidator.ALLOW_ALL_SCHEMES : 0;

        String allow2slashesVar =
            Resources.getVarValue("allow2slashes", field, validator, request,
                false);

        if ("true".equalsIgnoreCase(allow2slashesVar)) {
            options += UrlValidator.ALLOW_2_SLASHES;
        }

        String nofragmentsVar =
            Resources.getVarValue("nofragments", field, validator, request,
                false);

        if ("true".equalsIgnoreCase(nofragmentsVar)) {
            options += UrlValidator.NO_FRAGMENTS;
        }

        String schemesVar =
            allowallschemes ? null
                            : Resources.getVarValue("schemes", field,
                validator, request, false);

        // No options or schemes - use GenericValidator as default
        if ((options == 0) && (schemesVar == null)) {
            if (GenericValidator.isUrl(value)) {
                return true;
            } else {
                errors.add(field.getKey(),
                    Resources.getActionMessage(validator, request, va, field));

                return false;
            }
        }

        // Parse comma delimited list of schemes into a String[]
        String[] schemes = null;

        if (schemesVar != null) {
            StringTokenizer st = new StringTokenizer(schemesVar, ",");

            schemes = new String[st.countTokens()];

            int i = 0;

            while (st.hasMoreTokens()) {
                schemes[i++] = st.nextToken().trim();
            }
        }

        // Create UrlValidator and validate with options/schemes
        UrlValidator urlValidator = new UrlValidator(schemes, options);

        if (urlValidator.isValid(value)) {
            return true;
        } else {
            errors.add(field.getKey(),
                Resources.getActionMessage(validator, request, va, field));

            return false;
        }
    }

    /**
     * Process a validation failure.
     */
    private static void processFailure(ActionMessages errors, Field field,
        String formName, String validatorName, Throwable t) {
        // Log the error
        String logErrorMsg =
            sysmsgs.getMessage("validation.failed", validatorName,
                field.getProperty(), formName, t.toString());

        log.error(logErrorMsg, t);

        // Add general "system error" message to show to the user
        String userErrorMsg = sysmsgs.getMessage("system.error");

        errors.add(field.getKey(), new ActionMessage(userErrorMsg, false));
    }

    /**
     * Return <code>true</code> if the specified object is a String or a
     * <code>null</code> value.
     *
     * @param o Object to be tested
     * @return The string value
     */
    protected static boolean isString(Object o) {
        return (o == null) ? true : String.class.isInstance(o);
    }
}