--- /dev/null
+<?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\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\OutOfBoundsException;
+
+/**
+ * This definition decorates another definition.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class DefinitionDecorator extends Definition
+{
+ private $parent;
+ private $changes = array();
+
+ /**
+ * @param string $parent The id of Definition instance to decorate
+ */
+ public function __construct($parent)
+ {
+ parent::__construct();
+
+ $this->parent = $parent;
+ }
+
+ /**
+ * Returns the Definition being decorated.
+ *
+ * @return string
+ */
+ public function getParent()
+ {
+ return $this->parent;
+ }
+
+ /**
+ * Returns all changes tracked for the Definition object.
+ *
+ * @return array An array of changes for this Definition
+ */
+ public function getChanges()
+ {
+ return $this->changes;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setClass($class)
+ {
+ $this->changes['class'] = true;
+
+ return parent::setClass($class);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setFactory($callable)
+ {
+ $this->changes['factory'] = true;
+
+ return parent::setFactory($callable);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setFactoryClass($class)
+ {
+ $this->changes['factory_class'] = true;
+
+ return parent::setFactoryClass($class);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setFactoryMethod($method)
+ {
+ $this->changes['factory_method'] = true;
+
+ return parent::setFactoryMethod($method);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setFactoryService($service, $triggerDeprecationError = true)
+ {
+ $this->changes['factory_service'] = true;
+
+ return parent::setFactoryService($service, $triggerDeprecationError);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setConfigurator($callable)
+ {
+ $this->changes['configurator'] = true;
+
+ return parent::setConfigurator($callable);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setFile($file)
+ {
+ $this->changes['file'] = true;
+
+ return parent::setFile($file);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setPublic($boolean)
+ {
+ $this->changes['public'] = true;
+
+ return parent::setPublic($boolean);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setLazy($boolean)
+ {
+ $this->changes['lazy'] = true;
+
+ return parent::setLazy($boolean);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setDecoratedService($id, $renamedId = null, $priority = 0)
+ {
+ $this->changes['decorated_service'] = true;
+
+ return parent::setDecoratedService($id, $renamedId, $priority);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setDeprecated($boolean = true, $template = null)
+ {
+ $this->changes['deprecated'] = true;
+
+ return parent::setDeprecated($boolean, $template);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setAutowired($autowired)
+ {
+ $this->changes['autowire'] = true;
+
+ return parent::setAutowired($autowired);
+ }
+
+ /**
+ * Gets an argument to pass to the service constructor/factory method.
+ *
+ * If replaceArgument() has been used to replace an argument, this method
+ * will return the replacement value.
+ *
+ * @param int $index
+ *
+ * @return mixed The argument value
+ *
+ * @throws OutOfBoundsException When the argument does not exist
+ */
+ public function getArgument($index)
+ {
+ if (array_key_exists('index_'.$index, $this->arguments)) {
+ return $this->arguments['index_'.$index];
+ }
+
+ $lastIndex = count(array_filter(array_keys($this->arguments), 'is_int')) - 1;
+
+ if ($index < 0 || $index > $lastIndex) {
+ throw new OutOfBoundsException(sprintf('The index "%d" is not in the range [0, %d].', $index, $lastIndex));
+ }
+
+ return $this->arguments[$index];
+ }
+
+ /**
+ * You should always use this method when overwriting existing arguments
+ * of the parent definition.
+ *
+ * If you directly call setArguments() keep in mind that you must follow
+ * certain conventions when you want to overwrite the arguments of the
+ * parent definition, otherwise your arguments will only be appended.
+ *
+ * @param int $index
+ * @param mixed $value
+ *
+ * @return $this
+ *
+ * @throws InvalidArgumentException when $index isn't an integer
+ */
+ public function replaceArgument($index, $value)
+ {
+ if (!is_int($index)) {
+ throw new InvalidArgumentException('$index must be an integer.');
+ }
+
+ $this->arguments['index_'.$index] = $value;
+
+ return $this;
+ }
+}