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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\BrowserKit;
/**
* History.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class History
{
protected $stack = array();
protected $position = -1;
/**
* Constructor.
*/
public function __construct()
{
$this->clear();
}
/**
* Clears the history.
*/
public function clear()
{
$this->stack = array();
$this->position = -1;
}
/**
* Adds a Request to the history.
*
* @param Request $request A Request instance
*/
public function add(Request $request)
{
$this->stack = array_slice($this->stack, 0, $this->position + 1);
$this->stack[] = clone $request;
$this->position = count($this->stack) - 1;
}
/**
* Returns true if the history is empty.
*
* @return Boolean true if the history is empty, false otherwise
*/
public function isEmpty()
{
return count($this->stack) == 0;
}
/**
* Goes back in the history.
*
* @return Request A Request instance
*
* @throws \LogicException if the stack is already on the first page
*/
public function back()
{
if ($this->position < 1) {
throw new \LogicException('You are already on the first page.');
}
return clone $this->stack[--$this->position];
}
/**
* Goes forward in the history.
*
* @return Request A Request instance
*
* @throws \LogicException if the stack is already on the last page
*/
public function forward()
{
if ($this->position > count($this->stack) - 2) {
throw new \LogicException('You are already on the last page.');
}
return clone $this->stack[++$this->position];
}
/**
* Returns the current element in the history.
*
* @return Request A Request instance
*
* @throws \LogicException if the stack is empty
*/
public function current()
{
if (-1 == $this->position) {
throw new \LogicException('The page history is empty.');
}
return clone $this->stack[$this->position];
}
}
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