FormValidator.inc.php

<?php
// The two allowed states for the type field
define('FORM_VALIDATOR_OPTIONAL_VALUE', 'optional');
define('FORM_VALIDATOR_REQUIRED_VALUE', 'required');
 
class FormValidator {
 
   var $_form;
 
   var $_field;
 
   var $_type;
 
   var $_message;
 
   var $_validator;
 
   function __construct(&$form, $field, $type, $message, $validator = null) {
      $this->_form =& $form;
      $this->_field = $field;
      $this->_type = $type;
      $this->_message = $message;
      $this->_validator =& $validator;
 
      $form->cssValidation[$field] = array();
      if ($type == FORM_VALIDATOR_REQUIRED_VALUE) {
         array_push($form->cssValidation[$field], 'required');
      }
   }
 
 
   //
   // Setters and Getters
   //
   function getField() {
      return $this->_field;
   }
 
   function getMessage() {
      return __($this->_message);
   }
 
   function &getForm() {
      return $this->_form;
   }
 
   function &getValidator() {
      return $this->_validator;
   }
 
   function getType() {
      return $this->_type;
   }
 
 
   //
   // Public methods
   //
   function isValid() {
      if ($this->isEmptyAndOptional()) return true;
 
      $validator =& $this->getValidator();
      if (is_null($validator)) {
         // Default check: field must not be empty.
         $fieldValue = $this->getFieldValue();
         if (is_scalar($fieldValue)) {
            return $fieldValue !== '';
         } else {
            return $fieldValue !== array();
         }
      } else {
         // Delegate to the validator for the field value check.
         return $validator->isValid($this->getFieldValue());
      }
   }
 
   //
   // Protected helper methods
   //
   function getFieldValue() {
      $form =& $this->getForm();
      $fieldValue = $form->getData($this->getField());
      if (is_null($fieldValue) || is_scalar($fieldValue)) $fieldValue = trim((string)$fieldValue);
      return $fieldValue;
   }
 
   function isEmptyAndOptional() {
      if ($this->getType() != FORM_VALIDATOR_OPTIONAL_VALUE) return false;
 
      $fieldValue = $this->getFieldValue();
      if (is_scalar($fieldValue)) {
         return $fieldValue == '';
      } else {
         return empty($fieldValue);
      }
   }
}