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diff --git a/src/main/javassist/convert/Transformer.java b/src/main/javassist/convert/Transformer.java
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+++ b/src/main/javassist/convert/Transformer.java
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+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.convert;
+
+import javassist.bytecode.*;
+import javassist.CtClass;
+import javassist.CannotCompileException;
+
+/**
+ * Transformer and its subclasses are used for executing
+ * code transformation specified by CodeConverter.
+ *
+ * @see javassist.CodeConverter
+ */
+public abstract class Transformer implements Opcode {
+    private Transformer next;
+
+    public Transformer(Transformer t) {
+	next = t;
+    }
+
+    public Transformer getNext() { return next; }
+
+    public void initialize(ConstPool cp, CodeAttribute attr) {}
+
+    public void clean() {}
+
+    public abstract int transform(CtClass clazz, int pos, CodeIterator it,
+		ConstPool cp) throws CannotCompileException, BadBytecode;
+
+    public int extraLocals() { return 0; }
+}