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sources/3rdparty/phpdocx/lib/log4php/LoggerAppenderPool.php 2.89 KB
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  <?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
   */
  
  /**
   * Pool implmentation for LoggerAppender instances.
   * 
   * The pool is used when configuring log4php. First all appender instances 
   * are created in the pool. Afterward, they are linked to loggers, each 
   * appender can be linked to multiple loggers. This makes sure duplicate 
   * appenders are not created.
   *
   * @version $Revision: 1350602 $
   * @package log4php
   */
  class LoggerAppenderPool {
  	
  	/** Holds appenders indexed by their name */
  	public static $appenders =  array();
  
  	/**
  	 * Adds an appender to the pool. 
  	 * The appender must be named for this operation. 
  	 * @param LoggerAppender $appender
  	 */
  	public static function add(LoggerAppender $appender) {
  		$name = $appender->getName();
  		
  		if(empty($name)) {
  			trigger_error('log4php: Cannot add unnamed appender to pool.', E_USER_WARNING);
  			return;
  		}
  		
  		if (isset(self::$appenders[$name])) {
  			trigger_error("log4php: Appender [$name] already exists in pool. Overwriting existing appender.", E_USER_WARNING);
  		}
  		
  		self::$appenders[$name] = $appender;
  	}
  	
  	/** 
  	 * Retrieves an appender from the pool by name. 
  	 * @param string $name Name of the appender to retrieve.
  	 * @return LoggerAppender The named appender or NULL if no such appender 
  	 *  exists in the pool.
  	 */
  	public static function get($name) {
  		return isset(self::$appenders[$name]) ? self::$appenders[$name] : null;
  	}
  	
  	/**
  	* Removes an appender from the pool by name.
  	* @param string $name Name of the appender to remove.
  	*/
  	public static function delete($name) {
  		unset(self::$appenders[$name]);
  	}
  	
  	/**
  	 * Returns all appenders from the pool.
  	 * @return array Array of LoggerAppender objects.
  	 */
  	public static function getAppenders() {
  		return self::$appenders;
  	}
  	
  	/**
  	 * Checks whether an appender exists in the pool.
  	 * @param string $name Name of the appender to look for.
  	 * @return boolean TRUE if the appender with the given name exists.
  	 */
  	public static function exists($name) {
  		return isset(self::$appenders[$name]);
  	}
  
  	/**
  	 * Clears all appenders from the pool.
  	 */
  	public static function clear() {
  		 self::$appenders =  array();
  	}
  }