<?php
/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @package log4php
 */

/**
 * @ignore 
 */
if (!defined('LOG4PHP_DIR')) define('LOG4PHP_DIR', dirname(__FILE__)); 

/**
 * Extend this abstract class to create your own log layout format.
 *  
 * @author  Marco Vassura
 * @version $Revision: 635069 $
 * @package log4php
 * @abstract
 */
abstract class LoggerLayout {

    /**
     * Creates LoggerLayout instances with the given class name.
     *
     * @param string $class
     * @return LoggerLayout
     */
    public static function factory($class)
    {
        if (!empty($class)) {
            $class = basename($class);
            if (!class_exists($class))
                include_once(LOG4PHP_DIR . "/layouts/{$class}.php");
            if (class_exists($class))
                return new $class();
        }
        return null;
    }

    /**
     * Override this method
     */
    abstract function activateOptions();

    /**
     * Override this method to create your own layout format.
     *
     * @param LoggerLoggingEvent
     * @return string
     */
    public function format($event)
    {
        return $event->getRenderedMessage();
    } 
    
    /**
     * Returns the content type output by this layout.
     * @return string
     */
    public function getContentType()
    {
        return "text/plain";
    } 
            
    /**
     * Returns the footer for the layout format.
     * @return string
     */
    public function getFooter()
    {
        return null;
    } 

    /**
     * Returns the header for the layout format.
     * @return string
     */
    public function getHeader()
    {
        return null;
    }
}