/**
* Generates a limit expression for a field based on limit data
* @param I2CE_FormField $fieldObj
* @param mixed $limit_data
* @param callback $ref. A callback function whose first arguement is the form, the second arguements
* is the field and which returns the way the field value should be references as a field. If the callback is null (the default) then
* the reference used is "$form+$field"
* @param string $parent_ref. Defaults to null. If not null, it is the referent to the parent id of the form
* @returns string SQL statement false on failure
*/
public function generateFieldLimit($fieldObj, $limit_data, $ref, $parent_ref = null)
{
if (!is_array($limit_data)) {
I2CE::raiseError("Expected array for generating field limit, but not received");
return false;
}
if (!array_key_exists('style', $limit_data) || !is_string($limit_data['style'])) {
I2CE::raiseError("Style is not given at 'style' ");
return false;
}
if (!array_key_exists('data', $limit_data) || !is_array($limit_data['data'])) {
$limit_data['data'] = array();
}
$method = 'generateLimit_' . $limit_data['style'];
if (!$fieldObj->_hasMethod($method)) {
I2CE::raiseError("Not able to generate limit for style " . $limit_data['style'] . " by method ({$method}) for class " . get_class($fieldObj));
return false;
}
$ret = $fieldObj->{$method}($limit_data['data'], $ref, $parent_ref);
if (is_string($ret)) {
return $ret;
} else {
I2CE::raiseError("Unexpected return from limit {$style}:" . print_r($ret, true));
return false;
}
}
