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+++ b/library/log4php/LoggerAppenderPool.php
@@ -0,0 +1,98 @@
+<?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();
+    }
+}
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