<?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
 * @version $Revision: 1326626 $
 * @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);
        }
    }
}