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diff --git a/fsa/src/vespa/fsamanagers/conceptnethandle.h b/fsa/src/vespa/fsamanagers/conceptnethandle.h
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+/**
+ * @author  Peter Boros
+ * @date    2004/10/01
+ * @version $Id$
+ * @file    conceptnetmanager.h
+ * @brief   Concept network handle class definition.
+ *
+ */
+
+#pragma once
+
+#include <string>
+
+#include "refcountable.h"
+#include <vespa/fsa/conceptnet.h>
+
+namespace fsa {
+
+// {{{ class ConceptNet::Handle
+
+/**
+ * @class Handle
+ * @brief Concept net handle.
+ *
+ * A Handle looks like a ConceptNet, but copies are cheap; the actual
+ * ConceptNet objects are refcounted and Handle copies merely copy the
+ * ConceptNet pointer and increment the refcount.
+ */
+class ConceptNet::Handle {
+
+private:
+
+  /**
+   * @brief Unimplemented private default constructor.
+   */
+  Handle();
+  /**
+   * @brief Unimplemented private assignment operator.
+   */
+  Handle& operator=(const Handle&);
+
+  class RefCountableConceptNet: public ConceptNet, public RefCountable<ConceptNet> {
+  public:
+    RefCountableConceptNet(const char *fsafile, const char *datafile=NULL, FileAccessMethod fam = FILE_ACCESS_UNDEF) : ConceptNet(fsafile,datafile,fam) {}
+  };
+
+  RefCountableConceptNet *_conceptNet; /**< The ConceptNet object itself. */
+
+public:
+
+  /**
+   * @brief Copy constructor.
+   *
+   * Duplicate a handle (and add new reference to the ConceptNet object.
+   *
+   * @param h Reference to existing ConceptNet::Handle.
+   */
+  Handle(const Handle& h) : _conceptNet(h._conceptNet)
+  {
+    _conceptNet->addReference();
+  }
+
+  /**
+   * @brief Constructor.
+   *
+   * @param fsafile %FSA file containing the units, with a perfect has
+   *                (used for indexing the data file).
+   * @param datafile Concept net data file.
+   * @param fam File access mode (read or mmap). If not set, the
+   *            global preferred access mode will be used.
+   */
+  Handle(const char *fsafile, const char *datafile=NULL, FileAccessMethod fam = FILE_ACCESS_UNDEF) :
+    _conceptNet(new RefCountableConceptNet(fsafile,datafile,fam))
+  {
+    _conceptNet->addReference();
+  }
+
+  /**
+   * @brief Constructor.
+   *
+   * @param fsafile %FSA file containing the units, with a perfect has
+   *                (used for indexing the data file).
+   * @param datafile Concept net data file.
+   * @param fam File access mode (read or mmap). If not set, the
+   *            global preferred access mode will be used.
+   */
+  Handle(const std::string &fsafile, const std::string &datafile=NULL, FileAccessMethod fam = FILE_ACCESS_UNDEF) :
+    _conceptNet(new RefCountableConceptNet(fsafile.c_str(),datafile.c_str(),fam))
+  {
+    _conceptNet->addReference();
+  }
+
+  /**
+   * @brief Destructor.
+   */
+  ~Handle(void)
+  {
+    _conceptNet->removeReference();
+  }
+
+  /**
+   * @brief Dereference operator, provides access to ConceptNet
+   *        methods.
+   *
+   * @return Reference to the ConceptNet object.
+   */
+  const ConceptNet& operator*() const { return *_conceptNet; }
+
+  /**
+   * @brief Dereference operator, provides access to ConceptNet
+   *        methods.
+   *
+   * @return Pointer the ConceptNet object.
+   */
+  const ConceptNet* operator->() const { return _conceptNet; }
+
+};
+
+// }}}
+
+} // namespace fsa
+