new file mode 100644
--- /dev/null
+++ b/library/log4php/pattern/LoggerPatternConverter.php
@@ -0,0 +1,128 @@
+<?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
+ */
+
+/**
+ * LoggerPatternConverter is an abstract class that provides the formatting
+ * functionality that derived classes need.
+ *
+ * <p>Conversion specifiers in a conversion patterns are parsed to
+ * individual PatternConverters. Each of which is responsible for
+ * converting a logging event in a converter specific manner.</p>
+ *
+ * @version $Revision: 1326626 $
+ * @package log4php
+ * @subpackage helpers
+ * @since 0.3
+ */
+abstract class LoggerPatternConverter {
+
+    /**
+     * Next converter in the converter chain.
+     * @var LoggerPatternConverter
+     */
+    public $next = null;
+
+    /**
+     * Formatting information, parsed from pattern modifiers.
+     * @var LoggerFormattingInfo
+     */
+    protected $formattingInfo;
+
+    /**
+     * Converter-specific formatting options.
+     * @var array
+     */
+    protected $option;
+
+    /**
+     * Constructor
+     * @param LoggerFormattingInfo $formattingInfo
+     * @param array $option
+     */
+    public function __construct(LoggerFormattingInfo $formattingInfo = null, $option = null) {
+        $this->formattingInfo = $formattingInfo;
+        $this->option = $option;
+        $this->activateOptions();
+    }
+
+    /**
+     * Called in constructor. Converters which need to process the options
+     * can override this method.
+     */
+    public function activateOptions() {
+    }
+
+    /**
+     * Converts the logging event to the desired format. Derived pattern
+     * converters must implement this method.
+     *
+     * @param LoggerLoggingEvent $event
+     */
+    abstract public function convert(LoggerLoggingEvent $event);
+
+    /**
+     * Converts the event and formats it according to setting in the
+     * Formatting information object.
+     *
+     * @param string &$sbuf string buffer to write to
+     * @param LoggerLoggingEvent $event Event to be formatted.
+     */
+    public function format(&$sbuf, $event) {
+        $string = $this->convert($event);
+
+        if (!isset($this->formattingInfo)) {
+            $sbuf .= $string;
+            return;
+        }
+
+        $fi = $this->formattingInfo;
+
+        // Empty string
+        if ($string === '' || is_null($string)) {
+            if ($fi->min > 0) {
+                $sbuf .= str_repeat(' ', $fi->min);
+            }
+            return;
+        }
+
+        $len = strlen($string);
+
+        // Trim the string if needed
+        if ($len > $fi->max) {
+            if ($fi->trimLeft) {
+                $sbuf .= substr($string, $len - $fi->max, $fi->max);
+            } else {
+                $sbuf .= substr($string, 0, $fi->max);
+            }
+        } // Add padding if needed
+        else if ($len < $fi->min) {
+            if ($fi->padLeft) {
+                $sbuf .= str_repeat(' ', $fi->min - $len);
+                $sbuf .= $string;
+            } else {
+                $sbuf .= $string;
+                $sbuf .= str_repeat(' ', $fi->min - $len);
+            }
+        } // No action needed
+        else {
+            $sbuf .= $string;
+        }
+    }
+}