Abstract.php

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<?php
#require_once 'Zend/Log/Filter/Priority.php';

abstract class Zend_Log_Writer_Abstract implements Zend_Log_FactoryInterface
{
    protected $_filters = array();

    protected $_formatter;

    public function addFilter($filter)
    {
        if (is_int($filter)) {
            $filter = new Zend_Log_Filter_Priority($filter);
        }

        if (!$filter instanceof Zend_Log_Filter_Interface) {
            #require_once 'Zend/Log/Exception.php';
            throw new Zend_Log_Exception('Invalid filter provided');
        }

        $this->_filters[] = $filter;
        return $this;
    }

    public function write($event)
    {
        foreach ($this->_filters as $filter) {
            if (!$filter->accept($event)) {
                return;
            }
        }

        // exception occurs on error
        $this->_write($event);
    }

    public function setFormatter(Zend_Log_Formatter_Interface $formatter)
    {
        $this->_formatter = $formatter;
        return $this;
    }

    public function shutdown()
    {}

    abstract protected function _write($event);

    static protected function _parseConfig($config)
    {
        if ($config instanceof Zend_Config) {
            $config = $config->toArray();
        }

        if (!is_array($config)) {
            #require_once 'Zend/Log/Exception.php';
            throw new Zend_Log_Exception(
                'Configuration must be an array or instance of Zend_Config'
            );
        }

        return $config;
    }
}