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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\EventDispatcher;
/**
* Event encapsulation class.
*
* Encapsulates events thus decoupling the observer from the subject they encapsulate.
*
* @author Drak <drak@zikula.org>
*/
class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
{
protected $subject;
protected $arguments;
/**
* Encapsulate an event with $subject and $args.
*
* @param mixed $subject The subject of the event, usually an object or a callable
* @param array $arguments Arguments to store in the event
*/
public function __construct($subject = null, array $arguments = array())
{
$this->subject = $subject;
$this->arguments = $arguments;
}
/**
* Getter for subject property.
*
* @return mixed $subject The observer subject
*/
public function getSubject()
{
return $this->subject;
}
/**
* Get argument by key.
*
* @param string $key Key
*
* @return mixed Contents of array key
*
* @throws \InvalidArgumentException if key is not found
*/
public function getArgument($key)
{
if ($this->hasArgument($key)) {
return $this->arguments[$key];
}
throw new \InvalidArgumentException(sprintf('Argument "%s" not found.', $key));
}
/**
* Add argument to event.
*
* @param string $key Argument name
* @param mixed $value Value
*
* @return $this
*/
public function setArgument($key, $value)
{
$this->arguments[$key] = $value;
return $this;
}
/**
* Getter for all arguments.
*
* @return array
*/
public function getArguments()
{
return $this->arguments;
}
/**
* Set args property.
*
* @param array $args Arguments
*
* @return $this
*/
public function setArguments(array $args = array())
{
$this->arguments = $args;
return $this;
}
/**
* Has argument.
*
* @param string $key Key of arguments array
*
* @return bool
*/
public function hasArgument($key)
{
return array_key_exists($key, $this->arguments);
}
/**
* ArrayAccess for argument getter.
*
* @param string $key Array key
*
* @return mixed
*
* @throws \InvalidArgumentException if key does not exist in $this->args
*/
public function offsetGet($key)
{
return $this->getArgument($key);
}
/**
* ArrayAccess for argument setter.
*
* @param string $key Array key to set
* @param mixed $value Value
*/
public function offsetSet($key, $value)
{
$this->setArgument($key, $value);
}
/**
* ArrayAccess for unset argument.
*
* @param string $key Array key
*/
public function offsetUnset($key)
{
if ($this->hasArgument($key)) {
unset($this->arguments[$key]);
}
}
/**
* ArrayAccess has argument.
*
* @param string $key Array key
*
* @return bool
*/
public function offsetExists($key)
{
return $this->hasArgument($key);
}
/**
* IteratorAggregate for iterating over the object like an array.
*
* @return \ArrayIterator
*/
public function getIterator()
{
return new \ArrayIterator($this->arguments);
}
}