new file mode 100644
--- /dev/null
+++ b/library/log4php/LoggerConfigurable.php
@@ -0,0 +1,116 @@
+<?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
+ */
+
+/**
+ * A base class from which all classes which have configurable properties are
+ * extended. Provides a generic setter with integrated validation.
+ *
+ * @package log4php
+ * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
+ * @version $Revision $
+ * @since 2.2
+ */
+abstract class LoggerConfigurable {
+
+    /** Setter function for boolean type. */
+    protected function setBoolean($property, $value) {
+        try {
+            $this->$property = LoggerOptionConverter::toBooleanEx($value);
+        } catch (Exception $ex) {
+            $value = var_export($value, true);
+            $this->warn("Invalid value given for '$property' property: [$value]. Expected a boolean value. Property not changed.");
+        }
+    }
+
+    /** Setter function for integer type. */
+    protected function setInteger($property, $value) {
+        try {
+            $this->$property = LoggerOptionConverter::toIntegerEx($value);
+        } catch (Exception $ex) {
+            $value = var_export($value, true);
+            $this->warn("Invalid value given for '$property' property: [$value]. Expected an integer. Property not changed.");
+        }
+    }
+
+    /** Setter function for LoggerLevel values. */
+    protected function setLevel($property, $value) {
+        try {
+            $this->$property = LoggerOptionConverter::toLevelEx($value);
+        } catch (Exception $ex) {
+            $value = var_export($value, true);
+            $this->warn("Invalid value given for '$property' property: [$value]. Expected a level value. Property not changed.");
+        }
+    }
+
+    /** Setter function for integer type. */
+    protected function setPositiveInteger($property, $value) {
+        try {
+            $this->$property = LoggerOptionConverter::toPositiveIntegerEx($value);
+        } catch (Exception $ex) {
+            $value = var_export($value, true);
+            $this->warn("Invalid value given for '$property' property: [$value]. Expected a positive integer. Property not changed.");
+        }
+    }
+
+    /** Setter for file size. */
+    protected function setFileSize($property, $value) {
+        try {
+            $this->$property = LoggerOptionConverter::toFileSizeEx($value);
+        } catch (Exception $ex) {
+            $value = var_export($value, true);
+            $this->warn("Invalid value given for '$property' property: [$value]. Expected a file size value.  Property not changed.");
+        }
+    }
+
+    /** Setter function for numeric type. */
+    protected function setNumeric($property, $value) {
+        try {
+            $this->$property = LoggerOptionConverter::toNumericEx($value);
+        } catch (Exception $ex) {
+            $value = var_export($value, true);
+            $this->warn("Invalid value given for '$property' property: [$value]. Expected a number. Property not changed.");
+        }
+    }
+
+    /** Setter function for string type. */
+    protected function setString($property, $value, $nullable = false) {
+        if ($value === null) {
+            if ($nullable) {
+                $this->$property = null;
+            } else {
+                $this->warn("Null value given for '$property' property. Expected a string. Property not changed.");
+            }
+        } else {
+            try {
+                $value = LoggerOptionConverter::toStringEx($value);
+                $this->$property = LoggerOptionConverter::substConstants($value);
+            } catch (Exception $ex) {
+                $value = var_export($value, true);
+                $this->warn("Invalid value given for '$property' property: [$value]. Expected a string. Property not changed.");
+            }
+        }
+    }
+
+    /** Triggers a warning. */
+    protected function warn($message) {
+        $class = get_class($this);
+        trigger_error("log4php: $class: $message", E_USER_WARNING);
+    }
+}