diff --git a/annotations-processor/src/main/java/org/apache/commons/digester3/annotations/processor/FilerCodeWriter.java b/annotations-processor/src/main/java/org/apache/commons/digester3/annotations/processor/FilerCodeWriter.java
new file mode 100644
index 0000000..27cad1f
--- /dev/null
+++ b/annotations-processor/src/main/java/org/apache/commons/digester3/annotations/processor/FilerCodeWriter.java
@@ -0,0 +1,67 @@
+package org.apache.commons.digester3.annotations.processor;
+
+/*
+ * 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.
+ */
+
+import static java.lang.String.format;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import javax.annotation.processing.Filer;
+
+import com.sun.codemodel.CodeWriter;
+import com.sun.codemodel.JPackage;
+
+/**
+ * @since 3.3
+ */
+final class FilerCodeWriter
+    extends CodeWriter
+{
+
+    /**
+     * Java source file extension.
+     */
+    private static final String JAVA_FILE_EXTENSION = ".java";
+
+    private final Filer filer;
+
+    public FilerCodeWriter( Filer filer )
+    {
+        this.filer = filer;
+    }
+
+    @Override
+    public OutputStream openBinary( JPackage pkg, String fileName )
+        throws IOException
+    {
+        String className = fileName.substring( 0, fileName.length() - JAVA_FILE_EXTENSION.length() );
+
+        return filer.createSourceFile( format( "%s.%s", pkg.name(), className ) ).openOutputStream();
+    }
+
+    @Override
+    public void close()
+        throws IOException
+    {
+        // do nothing
+    }
+
+}