interface/modules/zend_modules/library/Zend/Stdlib/Hydrator/Strategy/StrategyChain.php

   1 <?php
   2 /**
   3  * Zend Framework (http://framework.zend.com/)
   4  *
   5  * @link      http://github.com/zendframework/zf2 for the canonical source repository
   6  * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
   7  * @license   http://framework.zend.com/license/new-bsd New BSD License
   8  */
   9
  10 namespace Zend\Stdlib\Hydrator\Strategy;
  11
  12 use Traversable;
  13 use Zend\Stdlib\ArrayUtils;
  14
  15 final class StrategyChain implements StrategyInterface
  16 {
  17     /**
  18      * Strategy chain for extraction
  19      *
  20      * @var StrategyInterface[]
  21      */
  22     private $extractionStrategies;
  23
  24     /**
  25      * Strategy chain for hydration
  26      *
  27      * @var StrategyInterface[]
  28      */
  29     private $hydrationStrategies;
  30
  31     /**
  32      * Constructor
  33      *
  34      * @param array|Traversable $extractionStrategies
  35      */
  36     public function __construct($extractionStrategies)
  37     {
  38         $extractionStrategies = ArrayUtils::iteratorToArray($extractionStrategies);
  39         $this->extractionStrategies = array_map(
  40             function (StrategyInterface $strategy) {
  41                 // this callback is here only to ensure type-safety
  42                 return $strategy;
  43             },
  44             $extractionStrategies
  45         );
  46
  47         $this->hydrationStrategies = array_reverse($extractionStrategies);
  48     }
  49
  50     /**
  51      * {@inheritDoc}
  52      */
  53     public function extract($value)
  54     {
  55         foreach ($this->extractionStrategies as $strategy) {
  56             $value = $strategy->extract($value);
  57         }
  58
  59         return $value;
  60     }
  61
  62     /**
  63      * {@inheritDoc}
  64      */
  65     public function hydrate($value)
  66     {
  67         foreach ($this->hydrationStrategies as $strategy) {
  68             $value = $strategy->hydrate($value);
  69         }
  70
  71         return $value;
  72     }
  73 }