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<?php |
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namespace Akkroo; |
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use ArrayObject; |
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use InvalidArgumentException; |
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use LogicException; |
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use JsonSerializable; |
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/** |
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* Manage a collection of resources |
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* |
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* The collection behaves like an array of objects, it can be filtered and serialized to JSON |
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*/ |
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class Collection extends ArrayObject implements JsonSerializable |
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{ |
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protected $itemType = null; |
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protected $writeable = true; |
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protected $requestID = null; |
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protected $meta = []; |
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/** |
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* Constructor |
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* |
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* @param array $data Array of resources |
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* @param string $itemType Acceptable resource class |
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* @return void |
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*/ |
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public function __construct(array $data = [], string $itemType = Resource::class) |
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{ |
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$this->itemType = $itemType; |
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array_map(function ($item) { |
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if (!empty($item)) { |
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if (is_array($item)) { |
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$this->append(new $this->itemType($item)); |
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return $item; |
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} |
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if (is_a($item, $this->itemType)) { |
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$this->append($item); |
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return $item; |
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} |
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} |
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throw new InvalidArgumentException('Invalid item data: array expected'); |
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}, $data); |
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$this->writeable = false; |
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} |
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/** |
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* Sets the value at the specified index to newval |
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* |
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* Wraps parent method to account for read-only collections |
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* |
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* @param mixed $index The index being set |
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* @param mixed $newval The new value for the index |
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* @return void |
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*/ |
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public function offsetSet($index, $newval) |
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{ |
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if (!$this->writeable) { |
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throw new LogicException('Cannot add elements to a read-only collection'); |
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} |
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parent::offsetSet($index, $newval); |
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} |
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/** |
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* Unsets the value at the specified index |
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* |
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* Wraps parent method to account for read-only collections |
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* Unlike offsetSet we don't need to check for witeable here, |
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* because every collection is read-only once created and |
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* cannot be made writeable |
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* |
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* @param mixed $index The index being unset |
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* @return void |
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*/ |
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public function offsetUnset($index) |
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{ |
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throw new LogicException('Cannot remove elements from a read-only collection'); |
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} |
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/** |
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* Link a collection to an API request |
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* |
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* @param string $value ID provided by HTTP client |
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* @return \Akkroo\Collection |
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*/ |
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public function withRequestID(string $value) |
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{ |
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$this->requestID = $value; |
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return $this; |
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} |
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/** |
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* Embed pagination metadata |
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* |
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* @param array $data Associative array of metadata |
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* @return \Akkroo\Collection |
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*/ |
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public function withMeta(array $data) |
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{ |
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$this->meta = $data; |
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return $this; |
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} |
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/** |
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* Fetch pagination metadata |
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* |
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* @param string $key Specific key to retrieve |
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* @return string|array |
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*/ |
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public function getMeta(string $key = null) |
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{ |
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if (!empty($key)) { |
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if (isset($this->meta[$key])) { |
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return $this->meta[$key]; |
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} |
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return null; |
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} |
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return $this->meta; |
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} |
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/** |
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* Customize JSON encode output |
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* |
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* @return array |
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*/ |
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public function jsonSerialize() |
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{ |
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return $this->getArrayCopy(); |
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} |
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/** |
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* Filters elements of an array using a callback function |
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* |
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* @param callable $callback The callback function to use |
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* @return \Akkroo\Collection The filtered collection |
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*/ |
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public function filter(callable $callback) |
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{ |
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return new self(array_filter($this->getArrayCopy(), $callback), $this->itemType); |
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} |
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} |
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