<?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
 */

/**
 * Returns the Mapped Diagnostic Context value corresponding to the given key.
 * 
 * Options:
 *  [0] the MDC key
 * 
 * @package log4php
 * @subpackage pattern
 * @since 2.3
 */
class LoggerPatternConverterMDC extends LoggerPatternConverter {

	private $key;

	public function activateOptions() {
		if (isset($this->option) && $this->option !== '') {
			$this->key = $this->option;
		}
	}
	
	public function convert(LoggerLoggingEvent $event) {
		if (isset($this->key)) {
			return $event->getMDC($this->key);
		} else {
			$buff = array();
			$map = $event->getMDCMap();
			foreach($map as $key => $value) {
				$buff []= "$key=$value";
			}
			return implode(', ', $buff);
		}
	}
}