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ClosureStrategy.php
001 <?php
002 /**
003 * Zend Framework (http://framework.zend.com/)
004 *
005 * @link http://github.com/zendframework/zf2 for the canonical source repository
006 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
007 * @license http://framework.zend.com/license/new-bsd New BSD License
008 */
009
010 namespace Zend\Stdlib\Hydrator\Strategy;
011
012 class ClosureStrategy implements StrategyInterface
013 {
014 /**
015 * Function, used in extract method, default:
016 * function ($value) {
017 * return $value;
018 * };
019 * @var callable
020 */
021 protected $extractFunc = null;
022
023 /**
024 * Function, used in hydrate method, default:
025 * function ($value) {
026 * return $value;
027 * };
028 * @var callable
029 */
030 protected $hydrateFunc = null;
031
032 /**
033 * You can describe how your values will extract and hydrate, like this:
034 * $hydrator->addStrategy('category', new ClosureStrategy(
035 * function (Category $value) {
036 * return (int) $value->id;
037 * },
038 * function ($value) {
039 * return new Category((int) $value);
040 * }
041 * ));
042 *
043 * @param callable $extractFunc - anonymous function, that extract values
044 * from object
045 * @param callable $hydrateFunc - anonymous function, that hydrate values
046 * into object
047 */
048 public function __construct($extractFunc = null, $hydrateFunc = null)
049 {
050 if (isset($extractFunc)) {
051 if (!is_callable($extractFunc)) {
052 throw new \Exception('$extractFunc must be callable');
053 }
054
055 $this->extractFunc = $extractFunc;
056 } else {
057 $this->extractFunc = function ($value) {
058 return $value;
059 };
060 }
061
062 if (isset($hydrateFunc)) {
063 if (!is_callable($hydrateFunc)) {
064 throw new \Exception('$hydrateFunc must be callable');
065 }
066
067 $this->hydrateFunc = $hydrateFunc;
068 } else {
069 $this->hydrateFunc = function ($value) {
070 return $value;
071 };
072 }
073 }
074
075 /**
076 * Converts the given value so that it can be extracted by the hydrator.
077 *
078 * @param mixed $value The original value.
079 * @param array $object The object is optionally provided as context.
080 * @return mixed Returns the value that should be extracted.
081 */
082 public function extract($value, $object = null)
083 {
084 $func = $this->extractFunc;
085
086 return $func($value, $object);
087 }
088
089 /**
090 * Converts the given value so that it can be hydrated by the hydrator.
091 *
092 * @param mixed $value The original value.
093 * @param array $data The whole data is optionally provided as context.
094 * @return mixed Returns the value that should be hydrated.
095 */
096 public function hydrate($value, $data = null)
097 {
098 $func = $this->hydrateFunc;
099
100 return $func($value, $data);
101 }
102 }
103