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<?php |
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/** |
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* Phossa Project |
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* |
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* PHP version 5.4 |
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* |
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* @category Library |
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* @package Phossa2\Shared |
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* @copyright Copyright (c) 2016 phossa.com |
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* @license http://mit-license.org/ MIT License |
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* @link http://www.phossa.com/ |
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*/ |
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/*# declare(strict_types=1); */ |
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namespace Phossa2\Shared\Delegator; |
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/** |
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* DelegatorTrait |
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* |
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* Implementation of DelegatorInterface |
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* |
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* @package Phossa2\Shared |
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* @author Hong Zhang <[email protected]> |
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* @see DelegatorInterface |
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* @version 2.0.16 |
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* @since 2.0.8 added |
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* @since 2.0.15 modified, moved to new namespace |
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* @since 2.0.16 added clearLookupCache() |
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*/ |
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trait DelegatorTrait |
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{ |
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/** |
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* lookup pool of registries |
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* |
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* @var array |
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* @access protected |
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*/ |
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protected $lookup_pool = []; |
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/** |
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* cached found key |
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* |
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* @var string |
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* @access private |
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*/ |
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private $cache_key; |
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/** |
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* cached lookup registry for found $cache_key |
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* |
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* @var object |
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* @access private |
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*/ |
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private $cache_reg; |
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/** |
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* Append one registry to lookup pool |
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* |
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* @param object $registry |
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* @return $this |
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* @access protected |
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*/ |
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protected function addRegistry($registry) |
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{ |
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// remove it if exists already |
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$this->removeFromLookup($registry); |
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// set delegator in registry |
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if ($registry instanceof DelegatorAwareInterface) { |
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$registry->setDelegator($this); |
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} |
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// append to the pool |
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$this->lookup_pool[] = $registry; |
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return $this; |
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} |
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/** |
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* check existence in the whole lookup pool |
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* |
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* @param string $key |
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* @return bool |
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* @access protected |
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*/ |
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protected function hasInLookup(/*# string */ $key)/*# : bool */ |
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{ |
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foreach ($this->lookup_pool as $registry) { |
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if ($this->hasInRegistry($registry, $key)) { |
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$this->cache_key = $key; |
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$this->cache_reg = $registry; |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* get from lookup pool, return NULL if not found |
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* |
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* @param string $key |
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* @return mixed|null |
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* @access protected |
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*/ |
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protected function getFromLookup(/*# string */ $key) |
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{ |
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// found already ? or try find |
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if ($key === $this->cache_key || $this->hasInLookup($key)) { |
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return $this->getFromRegistry($this->cache_reg, $key); |
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} |
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// not found |
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return null; |
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} |
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/** |
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* Remove one registry from the pool |
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* |
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* @param object $registry |
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* @return $this |
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* @access protected |
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*/ |
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protected function removeFromLookup($registry) |
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{ |
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foreach ($this->lookup_pool as $idx => $reg) { |
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if ($registry === $reg) { |
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if ($reg instanceof DelegatorAwareInterface) { |
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$reg->setDelegator(); |
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} |
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unset($this->lookup_pool[$idx]); |
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} |
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} |
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return $this; |
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} |
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/** |
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* Clear lookup cache |
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* |
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* @access protected |
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*/ |
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protected function clearLookupCache() |
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{ |
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$this->cache_key = null; |
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} |
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/** |
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* Try HAS in registry |
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* |
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* @param object $registry |
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* @param string $key |
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* @return bool |
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* @access protected |
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*/ |
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abstract protected function hasInRegistry( |
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$registry, |
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/*# string */ $key |
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)/*# : bool */; |
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/** |
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* Try GET from registry |
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* |
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* @param object $registry |
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* @param string $key |
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* @return mixed|null |
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* @access protected |
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*/ |
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abstract protected function getFromRegistry( |
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$registry, |
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/*# string */ $key |
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); |
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} |
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phossa2 /
shared
