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<?php |
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namespace Pitchart\Collection; |
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/** |
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* A collection to manage objects of the same type |
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* |
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* @author Julien VITTE <[email protected]> |
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*/ |
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class TypedCollection extends Collection |
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{ |
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/** |
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* The class name required for any element of the collection |
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* |
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* @var string |
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*/ |
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protected $itemType; |
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/** |
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* @param array $items the items list |
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* @param string $itemType the class name for the collection elements |
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*/ |
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public function __construct(array $items, $itemType) |
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{ |
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self::validateItems($items, $itemType); |
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$this->itemType = $itemType; |
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parent::__construct($items); |
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} |
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/** |
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* Builder for TypedCollection objects |
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* |
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* @param iterable $iterable |
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* @return TypedCollection |
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*/ |
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public static function from($iterable) |
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{ |
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if ($iterable instanceof \Iterator) { |
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$items = iterator_to_array($iterable); |
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} |
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if (is_array($iterable) |
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|| $iterable instanceof \IteratorAggregate |
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) { |
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$items = (array) $iterable; |
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} |
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if (empty($items)) { |
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throw new \InvalidArgumentException(sprintf('Can\'t build [%s] from an empty array.', static::class)); |
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} |
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if (!is_object($items[0])) { |
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throw new \InvalidArgumentException(sprintf('Invalid type [%s] for value [%s].', gettype($items[0]), $items[0])); |
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} |
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return new static($items, get_class($items[0])); |
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} |
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/** |
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* @param $itemType |
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* @return $this |
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*/ |
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public function setItemType($itemType) |
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{ |
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$this->itemType = $itemType; |
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return $this; |
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} |
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/** |
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* @param object $item |
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*/ |
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public function add($item) |
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{ |
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$validator = self::validateItem($this->itemType); |
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$validator($item); |
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$this->append($item); |
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} |
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/** |
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* @param array $items |
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* @param string $itemType |
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* |
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* @throws \InvalidArgumentException |
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*/ |
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protected static function validateItems(array $items, $itemType) |
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{ |
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$validateItem = static::validateItem($itemType); |
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array_map( |
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function ($item) use ($validateItem) { |
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$validateItem($item); |
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}, |
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$items |
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); |
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} |
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/** |
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* @param string $type An object class name |
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* |
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* @return \Closure A function to validate the data type |
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* @throws \InvalidArgumentException |
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*/ |
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protected static function validateItem($type) |
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{ |
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return function ($item) use ($type) { |
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if (!is_object($item)) { |
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throw new \InvalidArgumentException(sprintf('Invalid type [%s], expected [%s].', gettype($item), $type)); |
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} |
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if (!is_a($item, $type)) { |
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throw new \InvalidArgumentException(sprintf('Invalid type [%s], expected [%s].', get_class($item), $type)); |
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} |
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}; |
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} |
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} |
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pitchart /
collection
