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<?php |
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/** |
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* Spiral Framework. |
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* |
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* @license MIT |
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* @author Anton Titov (Wolfy-J) |
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*/ |
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declare(strict_types=1); |
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namespace Spiral\Reactor; |
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use ArrayAccess; |
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use ArrayIterator; |
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use Countable; |
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use IteratorAggregate; |
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use ReflectionObject; |
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use Spiral\Reactor\Exception\ReactorException; |
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/** |
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* Provides ability to aggregate specific set of elements (type constrained), render them or |
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* apply set of operations. |
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*/ |
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class Aggregator extends AbstractDeclaration implements |
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ArrayAccess, |
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IteratorAggregate, |
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Countable, |
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ReplaceableInterface |
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{ |
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/** |
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* @var array |
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*/ |
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private $allowed; |
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/** |
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* @var DeclarationInterface[] |
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*/ |
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private $elements; |
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/** |
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* @param array $allowed |
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* @param array $elements |
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*/ |
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public function __construct(array $allowed, array $elements = []) |
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{ |
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$this->allowed = $allowed; |
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$this->elements = $elements; |
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} |
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/** |
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* Get element by it's name. |
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* |
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* @param string $name |
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* @return DeclarationInterface |
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* @throws ReactorException |
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*/ |
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public function __get($name) |
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{ |
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return $this->get($name); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isEmpty(): bool |
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{ |
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return empty($this->elements); |
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} |
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/** |
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* @return int |
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*/ |
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public function count(): int |
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{ |
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return count($this->elements); |
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} |
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/** |
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* Check if aggregation has named element with given name. |
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* |
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* @param string $name |
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* @return bool |
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*/ |
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public function has(string $name): bool |
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{ |
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foreach ($this->elements as $element) { |
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if ($element instanceof NamedInterface && $element->getName() === $name) { |
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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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* Add new element. |
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* |
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* @param DeclarationInterface $element |
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* @return self |
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* @throws ReactorException |
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*/ |
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public function add(DeclarationInterface $element): Aggregator |
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{ |
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$reflector = new ReflectionObject($element); |
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$allowed = false; |
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foreach ($this->allowed as $class) { |
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if ($reflector->isSubclassOf($class) || get_class($element) === $class) { |
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$allowed = true; |
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break; |
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} |
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} |
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if (!$allowed) { |
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$type = get_class($element); |
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throw new ReactorException("Elements with type '{$type}' are not allowed"); |
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} |
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$this->elements[] = $element; |
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return $this; |
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} |
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/** |
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* Get named element by it's name. |
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* |
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* @param string $name |
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* @return DeclarationInterface |
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* @throws ReactorException |
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*/ |
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public function get(string $name) |
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{ |
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return $this->find($name); |
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} |
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/** |
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* Remove element by it's name. |
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* |
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* @param string $name |
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* @return self |
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*/ |
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public function remove(string $name): Aggregator |
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{ |
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foreach ($this->elements as $index => $element) { |
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if ($element instanceof NamedInterface && $element->getName() === $name) { |
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unset($this->elements[$index]); |
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} |
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} |
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return $this; |
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} |
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/** |
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* @return ArrayIterator |
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*/ |
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public function getIterator(): ArrayIterator |
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{ |
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return new ArrayIterator($this->elements); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetExists($offset) |
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{ |
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return $this->has($offset); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetGet($offset) |
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{ |
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return $this->get($offset); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetSet($offset, $value): void |
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{ |
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$this->remove($offset)->add($value); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetUnset($offset): void |
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{ |
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$this->remove($offset); |
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} |
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/** |
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* {@inheritdoc} |
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* @return self |
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*/ |
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public function replace($search, $replace): Aggregator |
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{ |
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foreach ($this->elements as $element) { |
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if ($element instanceof ReplaceableInterface) { |
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$element->replace($search, $replace); |
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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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* {@inheritdoc} |
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*/ |
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public function render(int $indentLevel = 0): string |
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{ |
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$result = ''; |
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foreach ($this->elements as $element) { |
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$result .= $element->render($indentLevel) . "\n\n"; |
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} |
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return rtrim($result, "\n"); |
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} |
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/** |
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* Find element by it's name (NamedDeclarations only). |
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* |
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* @param string $name |
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* @return DeclarationInterface |
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* @throws ReactorException When unable to find. |
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*/ |
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protected function find(string $name): DeclarationInterface |
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{ |
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foreach ($this->elements as $element) { |
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if ($element instanceof NamedInterface && $element->getName() === $name) { |
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return $element; |
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} |
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} |
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throw new ReactorException("Unable to find element '{$name}'"); |
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} |
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} |
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