/**
* Returns an array of variants.
*
* With no arguments, returns all variants
*
* With a classname as the first argument, returns the variants that apply to that class
* (optionally including subclasses)
*
* @static
* @param string $class - The class name to get variants for
* @param bool $includeSubclasses - True if variants should be included if they apply to at least one subclass of $class
* @return array - An array of (string)$variantClassName => (Object)$variantInstance pairs
*/
public static function variants($class = null, $includeSubclasses = true)
{
if (!$class) {
if (self::$variants === null) {
$classes = ClassInfo::subclassesFor('SearchVariant');
$concrete = array();
foreach ($classes as $variantclass) {
$ref = new ReflectionClass($variantclass);
if ($ref->isInstantiable()) {
$variant = singleton($variantclass);
if ($variant->appliesToEnvironment()) {
$concrete[$variantclass] = $variant;
}
}
}
self::$variants = $concrete;
}
return self::$variants;
} else {
$key = $class . '!' . $includeSubclasses;
if (!isset(self::$class_variants[$key])) {
self::$class_variants[$key] = array();
foreach (self::variants() as $variantclass => $instance) {
if ($instance->appliesTo($class, $includeSubclasses)) {
self::$class_variants[$key][$variantclass] = $instance;
}
}
}
return self::$class_variants[$key];
}
}
/**
* Given an object and a field definition (as returned by fieldData) get the current value of that field on that object
*
* @param DataObject $object - The object to get the value from
* @param Array $field - The field definition to use
* @return Mixed - The value of the field, or null if we couldn't look it up for some reason
*/
protected function _getFieldValue($object, $field)
{
set_error_handler(create_function('$no, $str', 'throw new Exception("HTML Parse Error: ".$str);'), E_ALL);
try {
foreach ($field['lookup_chain'] as $step) {
// Just fail if we've fallen off the end of the chain
if (!$object) {
return null;
}
// If we're looking up this step on an array or SS_List, do the step on every item, merge result
if (is_array($object) || $object instanceof SS_List) {
$next = array();
foreach ($object as $item) {
if ($step['call'] == 'method') {
$method = $step['method'];
$item = $item->{$method}();
} else {
$property = $step['property'];
$item = $item->{$property};
}
if ($item instanceof SS_List) {
$next = array_merge($next, $item->toArray());
} elseif (is_array($item)) {
$next = array_merge($next, $item);
} else {
$next[] = $item;
}
}
$object = $next;
} else {
if ($step['call'] == 'method') {
$method = $step['method'];
$object = $object->{$method}();
} elseif ($step['call'] == 'variant') {
$variants = SearchVariant::variants($field['base'], true);
$variant = $variants[$step['variant']];
$method = $step['method'];
$object = $variant->{$method}($object);
} else {
$property = $step['property'];
$object = $object->{$property};
}
}
}
} catch (Exception $e) {
$object = null;
}
restore_error_handler();
return $object;
}
