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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 = array();
private $command;
/**
* Constructor.
*
* @param Helper[] $helpers An array of helper
*/
public function __construct(array $helpers = array())
{
foreach ($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];
}
/**
* Sets the command associated with this helper set.
*
* @param Command $command A Command instance
*/
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);
}
}