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- 27.10.2014
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HelperSet.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Console\Helper;
013
014 use Symfony\Component\Console\Command\Command;
015
016 /**
017 * HelperSet represents a set of helpers to be used with a command.
018 *
019 * @author Fabien Potencier <fabien@symfony.com>
020 */
021 class HelperSet
022 {
023 private $helpers;
024 private $command;
025
026 /**
027 * Constructor.
028 *
029 * @param Helper[] $helpers An array of helper.
030 */
031 public function __construct(array $helpers = array())
032 {
033 $this->helpers = array();
034 foreach ($helpers as $alias => $helper) {
035 $this->set($helper, is_int($alias) ? null : $alias);
036 }
037 }
038
039 /**
040 * Sets a helper.
041 *
042 * @param HelperInterface $helper The helper instance
043 * @param string $alias An alias
044 */
045 public function set(HelperInterface $helper, $alias = null)
046 {
047 $this->helpers[$helper->getName()] = $helper;
048 if (null !== $alias) {
049 $this->helpers[$alias] = $helper;
050 }
051
052 $helper->setHelperSet($this);
053 }
054
055 /**
056 * Returns true if the helper if defined.
057 *
058 * @param string $name The helper name
059 *
060 * @return bool true if the helper is defined, false otherwise
061 */
062 public function has($name)
063 {
064 return isset($this->helpers[$name]);
065 }
066
067 /**
068 * Gets a helper value.
069 *
070 * @param string $name The helper name
071 *
072 * @return HelperInterface The helper instance
073 *
074 * @throws \InvalidArgumentException if the helper is not defined
075 */
076 public function get($name)
077 {
078 if (!$this->has($name)) {
079 throw new \InvalidArgumentException(sprintf('The helper "%s" is not defined.', $name));
080 }
081
082 return $this->helpers[$name];
083 }
084
085 /**
086 * Sets the command associated with this helper set.
087 *
088 * @param Command $command A Command instance
089 */
090 public function setCommand(Command $command = null)
091 {
092 $this->command = $command;
093 }
094
095 /**
096 * Gets the command associated with this helper set.
097 *
098 * @return Command A Command instance
099 */
100 public function getCommand()
101 {
102 return $this->command;
103 }
104 }
105