Log FilterChain

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<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Log
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/**
 * @namespace
 */
namespace Zend\Log;

/**
 * Custom implementation of filter chain for logging
 *
 * @category   Zend
 * @package    Zend_Log
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class FilterChain
{
    /**
     * Filter chain
     *
     * @var array
     */
    protected $filters = array();

    /**
     * @param Filter|closure $callback
     * @return FilterChain
     * @throws Exception\InvalidArgumentException
     */
    public function attach($callback)
    {
        if ($callback instanceof Filter) {
            $callback = array($callback, 'filter');
        }

        if (!is_callable($callback)) {
            throw new Exception\InvalidArgumentException(sprintf(
                '$callback must be valid; received "%s"',
                is_object($callback) ? get_class($callback) : gettype($callback)
            ));
        }
        $this->filters[] = $callback;
        return $this;
    }

    /**
     * @param array $context
     * @return boolean
     */
    public function run(array $context)
    {
        if (0 == count($this->filters)) {
            return true;
        }

        foreach ($this->filters as $filter) {
            if (!call_user_func($filter, $context)) {
                return false;
            }
        }

        return true;
    }
}