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diff --git a/srcjar_unused/org/apache/log4j/helpers/MDCKeySetExtractor.java b/srcjar_unused/org/apache/log4j/helpers/MDCKeySetExtractor.java
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@@ -0,0 +1,92 @@
+/*
+ * 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 org.apache.log4j.helpers;
+
+import org.apache.log4j.spi.LoggingEvent;
+import org.apache.log4j.pattern.LogEvent;
+
+import java.lang.reflect.Method;
+import java.util.Set;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectOutputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ObjectInputStream;
+
+
+public final class MDCKeySetExtractor {
+    private final Method getKeySetMethod;
+    public static final MDCKeySetExtractor INSTANCE =
+            new MDCKeySetExtractor();
+
+
+    private MDCKeySetExtractor() {
+        //
+        //  log4j 1.2.15 and later will have method to get names
+        //     of all keys in MDC
+        //
+      Method getMethod = null;
+
+        try {
+           getMethod = LoggingEvent.class.getMethod(
+                      "getPropertyKeySet", null);
+        } catch(Exception ex) {
+            getMethod = null;
+        }
+      getKeySetMethod = getMethod;
+
+    }
+
+    public Set getPropertyKeySet(final LoggingEvent event) throws Exception {
+        //
+        //  MDC keys are not visible prior to log4j 1.2.15
+        //
+        Set keySet = null;
+        if (getKeySetMethod != null) {
+              keySet = (Set) getKeySetMethod.invoke(event, null);
+        } else {
+            //
+            //  for 1.2.14 and earlier could serialize and
+            //    extract MDC content
+              ByteArrayOutputStream outBytes = new ByteArrayOutputStream();
+              ObjectOutputStream os = new ObjectOutputStream(outBytes);
+              os.writeObject(event);
+              os.close();
+
+              byte[] raw = outBytes.toByteArray();
+              //
+              //   bytes 6 and 7 should be the length of the original classname
+              //     should be the same as our substitute class name
+              final String subClassName = LogEvent.class.getName();
+              if (raw[6] == 0 || raw[7] == subClassName.length()) {
+                  //
+                  //  manipulate stream to use our class name
+                  //
+                  for (int i = 0; i < subClassName.length(); i++) {
+                      raw[8 + i] = (byte) subClassName.charAt(i);
+                  }
+                  ByteArrayInputStream inBytes = new ByteArrayInputStream(raw);
+                  ObjectInputStream is = new ObjectInputStream(inBytes);
+                  Object cracked = is.readObject();
+                  if (cracked instanceof LogEvent) {
+                      keySet = ((LogEvent) cracked).getPropertyKeySet();
+                  }
+                  is.close();
+              }
+        }
+        return keySet;        
+    }
+}