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<?php
namespace Icinga\Module\Director\Data;
use Icinga\Data\Filter\Filter;
use Icinga\Data\Filter\FilterAnd;
use Icinga\Data\Filter\FilterExpression;
use Icinga\Data\Filter\FilterNot;
use Icinga\Data\Filter\FilterOr;
use Icinga\Exception\NotImplementedError;
/**
* Class ApplyFilterMatches
*
* A wrapper for Icinga Filter to evaluate filters against Director's objects
*/
class AssignFilterHelper
{
/** @var Filter */
protected $filter;
public function __construct(Filter $filter)
{
$this->filter = $filter;
}
/**
* @param object $object
*
* @return bool
* @throws NotImplementedError
*/
public function matches($object)
{
return $this->matchesPart($this->filter, $object);
}
/**
* @param Filter $filter
* @param object $object
*
* @return bool
*/
public static function matchesFilter(Filter $filter, $object)
{
$helper = new static($filter);
return $helper->matches($object);
}
/**
* @param Filter $filter
* @param object $object
*
* @return bool
* @throws NotImplementedError
*/
protected function matchesPart(Filter $filter, $object)
{
if ($filter->isChain()) {
return $this->matchesChain($filter, $object);
} elseif ($filter->isExpression()) {
/** @var FilterExpression $filter */
return $this->matchesExpression($filter, $object);
} else {
return $filter->matches($object);
}
}
/**
* @param Filter $filter
* @param object $object
*
* @return bool
* @throws NotImplementedError
*/
protected function matchesChain(Filter $filter, $object)
{
if ($filter instanceof FilterAnd) {
foreach ($filter->filters() as $f) {
if (! $this->matchesPart($f, $object)) {
return false;
}
}
return true;
} elseif ($filter instanceof FilterOr) {
foreach ($filter->filters() as $f) {
if ($this->matchesPart($f, $object)) {
return true;
}
}
return false;
} elseif ($filter instanceof FilterNot) {
foreach ($filter->filters() as $f) {
if ($this->matchesPart($f, $object)) {
return false;
}
}
return true;
} else {
$class = \get_class($filter);
$parts = \preg_split('/\\\/', $class);
throw new NotImplementedError(
'Matching for Filter of type "%s" is not implemented',
\end($parts)
);
}
}
/**
* @param FilterExpression $filter
* @param object $object
*
* @return bool
*/
protected function matchesExpression(FilterExpression $filter, $object)
{
$column = $filter->getColumn();
$sign = $filter->getSign();
$expression = $filter->getExpression();
if ($sign === '=') {
if ($expression === true) {
return property_exists($object, $column) && ! empty($object->{$column});
} elseif ($expression === false) {
return ! property_exists($object, $column) || empty($object->{$column});
} elseif (is_string($expression) && strpos($expression, '*') !== false) {
if (! property_exists($object, $column) || empty($object->{$column})) {
return false;
}
$value = $object->{$column};
$parts = array();
foreach (preg_split('~\*~', $expression) as $part) {
$parts[] = preg_quote($part);
}
// match() is case insensitive
$pattern = '/^' . implode('.*', $parts) . '$/i';
if (is_array($value)) {
foreach ($value as $candidate) {
if (preg_match($pattern, $candidate)) {
return true;
}
}
return false;
}
return (bool) preg_match($pattern, $value);
}
}
// fallback to default behavior
return $filter->matches($object);
}
}
|
