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