library/log4php/LoggerHierarchy.php
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<?php
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/**
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements. See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License. You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 *
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 * @package log4php
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 */
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/**
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 * This class is specialized in retrieving loggers by name and also maintaining
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 * the logger hierarchy. The logger hierarchy is dealing with the several Log-Levels
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 * Logger can have. From log4j website:
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 *
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 * "A logger is said to be an ancestor of another logger if its name followed
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 * by a dot is a prefix of the descendant logger name. A logger is said to be
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 * a parent of a child logger if there are no ancestors between itself and the
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 * descendant logger."
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 *
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 * Child Loggers do inherit their Log-Levels from their Ancestors. They can
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 * increase their Log-Level compared to their Ancestors, but they cannot decrease it.
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 *
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 * <p>The casual user does not have to deal with this class directly.</p>
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 *
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 * <p>The structure of the logger hierarchy is maintained by the
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 * getLogger method. The hierarchy is such that children link
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 * to their parent but parents do not have any pointers to their
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 * children. Moreover, loggers can be instantiated in any order, in
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 * particular descendant before ancestor.</p>
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 *
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 * <p>In case a descendant is created before a particular ancestor,
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 * then it creates a provision node for the ancestor and adds itself
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 * to the provision node. Other descendants of the same ancestor add
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 * themselves to the previously created provision node.</p>
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 *
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 * @version $Revision: 1394956 $
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 * @package log4php
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 */
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class LoggerHierarchy {
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    /** Array holding all Logger instances. */
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    protected $loggers = array();
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    /**
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     * The root logger.
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     * @var RootLogger
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     */
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    protected $root;
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    /**
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     * The logger renderer map.
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     * @var LoggerRendererMap
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     */
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    protected $rendererMap;
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    /**
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     * Main level threshold. Events with lower level will not be logged by any
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     * logger, regardless of it's configuration.
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     * @var LoggerLevel
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     */
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    protected $threshold;
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    /**
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     * Creates a new logger hierarchy.
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     * @param LoggerRoot $root The root logger.
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     */
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    public function __construct(LoggerRoot $root) {
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        $this->root = $root;
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        $this->setThreshold(LoggerLevel::getLevelAll());
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        $this->rendererMap = new LoggerRendererMap();
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    }
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    /**
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     * Clears all loggers.
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     */
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    public function clear() {
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        $this->loggers = array();
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    }
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    /**
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     * Check if the named logger exists in the hierarchy.
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     * @param string $name
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     * @return boolean
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     */
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    public function exists($name) {
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        return isset($this->loggers[$name]);
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    }
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    /**
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     * Returns all the currently defined loggers in this hierarchy as an array.
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     * @return array
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     */
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    public function getCurrentLoggers() {
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        return array_values($this->loggers);
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    }
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    /**
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     * Returns a named logger instance logger. If it doesn't exist, one is created.
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     *
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     * @param string $name Logger name
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     * @return Logger Logger instance.
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     */
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    public function getLogger($name) {
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        if (!isset($this->loggers[$name])) {
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            $logger = new Logger($name);
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            $nodes = explode('.', $name);
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            $firstNode = array_shift($nodes);
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            // if name is not a first node but another first node is their
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            if ($firstNode != $name and isset($this->loggers[$firstNode])) {
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                $logger->setParent($this->loggers[$firstNode]);
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            } else {
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                // if there is no father, set root logger as father
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                $logger->setParent($this->root);
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            }
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            // if there are more nodes than one
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            if (count($nodes) > 0) {
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                // find parent node
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                foreach ($nodes as $node) {
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                    $parentNode = "$firstNode.$node";
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                    if (isset($this->loggers[$parentNode]) and $parentNode != $name) {
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                        $logger->setParent($this->loggers[$parentNode]);
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                    }
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                    $firstNode .= ".$node";
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                }
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            }
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            $this->loggers[$name] = $logger;
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        }
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        return $this->loggers[$name];
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    }
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    /**
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     * Returns the logger renderer map.
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     * @return LoggerRendererMap
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     */
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    public function getRendererMap() {
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        return $this->rendererMap;
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    }
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    /**
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     * Returns the root logger.
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     * @return LoggerRoot
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     */
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    public function getRootLogger() {
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        return $this->root;
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    }
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    /**
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     * Returns the main threshold level.
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     * @return LoggerLevel
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     */
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    public function getThreshold() {
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        return $this->threshold;
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    }
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    /**
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     * Returns true if the hierarchy is disabled for given log level and false
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     * otherwise.
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     * @return boolean
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     */
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    public function isDisabled(LoggerLevel $level) {
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        return ($this->threshold->toInt() > $level->toInt());
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    }
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    /**
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     * Reset all values contained in this hierarchy instance to their
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     * default.
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     *
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     * This removes all appenders from all loggers, sets
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     * the level of all non-root loggers to <i>null</i>,
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     * sets their additivity flag to <i>true</i> and sets the level
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     * of the root logger to {@link LOGGER_LEVEL_DEBUG}.
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     *
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     * <p>Existing loggers are not removed. They are just reset.
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     *
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     * <p>This method should be used sparingly and with care as it will
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     * block all logging until it is completed.</p>
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     */
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    public function resetConfiguration() {
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        $root = $this->getRootLogger();
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        $root->setLevel(LoggerLevel::getLevelDebug());
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        $this->setThreshold(LoggerLevel::getLevelAll());
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        $this->shutDown();
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        foreach ($this->loggers as $logger) {
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            $logger->setLevel(null);
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            $logger->setAdditivity(true);
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            $logger->removeAllAppenders();
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        }
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        $this->rendererMap->reset();
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        LoggerAppenderPool::clear();
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    }
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    /**
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     * Sets the main threshold level.
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     * @param LoggerLevel $l
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     */
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    public function setThreshold(LoggerLevel $threshold) {
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        $this->threshold = $threshold;
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    }
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    /**
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     * Shutting down a hierarchy will <i>safely</i> close and remove
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     * all appenders in all loggers including the root logger.
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     *
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     * The shutdown method is careful to close nested
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     * appenders before closing regular appenders. This is allows
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     * configurations where a regular appender is attached to a logger
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     * and again to a nested appender.
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     *
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     * @todo Check if the last paragraph is correct.
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     */
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    public function shutdown() {
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        $this->root->removeAllAppenders();
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        foreach ($this->loggers as $logger) {
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            $logger->removeAllAppenders();
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        }
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    }
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    /**
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     * Prints the current Logger hierarchy tree. Useful for debugging.
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     */
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    public function printHierarchy() {
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        $this->printHierarchyInner($this->getRootLogger(), 0);
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    }
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    private function printHierarchyInner(Logger $current, $level) {
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        for ($i = 0; $i < $level; $i++) {
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            echo ($i == $level - 1) ? "|--" : "|  ";
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        }
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        echo $current->getName() . "\n";
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        foreach ($this->loggers as $logger) {
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            if ($logger->getParent() == $current) {
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                $this->printHierarchyInner($logger, $level + 1);
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            }
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        }
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    }
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}