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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Console\Helper; use Symfony\Component\Console\Command\Command; use Symfony\Component\Console\Exception\InvalidArgumentException; /** * HelperSet represents a set of helpers to be used with a command. * * @author Fabien Potencier <fabien@symfony.com> */ class HelperSet implements \IteratorAggregate { /** * @var Helper[] */ private $helpers = []; private $command; /** * @param Helper[] $helpers An array of helper */ public function __construct(array $helpers = []) { foreach ($helpers as $alias => $helper) { $this->set($helper, \is_int($alias) ? null : $alias); } } /** * Sets a helper. * * @param HelperInterface $helper The helper instance * @param string $alias An alias */ public function set(HelperInterface $helper, $alias = null) { $this->helpers[$helper->getName()] = $helper; if (null !== $alias) { $this->helpers[$alias] = $helper; } $helper->setHelperSet($this); } /** * Returns true if the helper if defined. * * @param string $name The helper name * * @return bool true if the helper is defined, false otherwise */ public function has($name) { return isset($this->helpers[$name]); } /** * Gets a helper value. * * @param string $name The helper name * * @return HelperInterface The helper instance * * @throws InvalidArgumentException if the helper is not defined */ public function get($name) { if (!$this->has($name)) { throw new InvalidArgumentException(sprintf('The helper "%s" is not defined.', $name)); } return $this->helpers[$name]; } public function setCommand(Command $command = null) { $this->command = $command; } /** * Gets the command associated with this helper set. * * @return Command A Command instance */ public function getCommand() { return $this->command; } /** * @return Helper[] */ public function getIterator() { return new \ArrayIterator($this->helpers); } }