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<?php
namespace SMW\Utils;
/**
* @license GNU GPL v2+
* @since 2.2
*
* @author mwjames
*/
class CircularReferenceGuard {
/**
* @var array
*/
private static $circularRefGuard = [];
/**
* @var string
*/
private $namespace = '';
/**
* @var integer
*/
private $maxRecursionDepth = 1;
/**
* @since 2.2
*
* @param string $namespace
*/
public function __construct( $namespace = '' ) {
$this->namespace = $namespace;
}
/**
* @since 2.2
*
* @param integer $maxRecursionDepth
*/
public function setMaxRecursionDepth( $maxRecursionDepth ) {
$this->maxRecursionDepth = (int)$maxRecursionDepth;
}
/**
* @since 2.2
*
* @param string $hash
*/
public function mark( $hash ) {
if ( !isset( self::$circularRefGuard[$this->namespace][$hash] ) ) {
self::$circularRefGuard[$this->namespace][$hash] = 0;
}
self::$circularRefGuard[$this->namespace][$hash]++;
}
/**
* @since 2.2
*
* @param string $hash
*/
public function unmark( $hash ) {
if ( isset( self::$circularRefGuard[$this->namespace][$hash] ) && self::$circularRefGuard[$this->namespace][$hash] > 0 ) {
return self::$circularRefGuard[$this->namespace][$hash]--;
}
unset( self::$circularRefGuard[$this->namespace][$hash] );
}
/**
* @since 2.2
*
* @param string $hash
*
* @return boolean
*/
public function isCircular( $hash ) {
return $this->get( $hash ) > $this->maxRecursionDepth;
}
/**
* @since 2.2
*
* @param string $hash
*
* @return integer
*/
public function get( $hash ) {
if ( isset( self::$circularRefGuard[$this->namespace][$hash] ) ) {
return self::$circularRefGuard[$this->namespace][$hash];
}
return 0;
}
/**
* @since 2.2
*
* @param string $namespace
*/
public function reset( $namespace ) {
self::$circularRefGuard[$namespace] = [];
}
}
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