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diff --git a/src/lib/base/ILogOutputter.h b/src/lib/base/ILogOutputter.h
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+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2002 Chris Schoeneman
+ * 
+ * This package is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * found in the file LICENSE that should have accompanied this file.
+ * 
+ * This package is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "base/Log.h"
+#include "base/ELevel.h"
+#include "common/IInterface.h"
+
+//! Outputter interface
+/*!
+Type of outputter interface.  The logger performs all output through
+outputters.  ILogOutputter overrides must not call any log functions
+directly or indirectly.
+*/
+class ILogOutputter : public IInterface {
+public:
+    //! @name manipulators
+    //@{
+
+    //! Open the outputter
+    /*!
+    Opens the outputter for writing.  Calling this method on an
+    already open outputter must have no effect.
+    */
+    virtual void        open(const char* title) = 0;
+
+    //! Close the outputter
+    /*!
+    Close the outputter.  Calling this method on an already closed
+    outputter must have no effect.
+    */
+    virtual void        close() = 0;
+
+    //! Show the outputter
+    /*!
+    Causes the output to become visible.  This generally only makes sense
+    for a logger in a graphical user interface.  Other implementations
+    will do nothing.  Iff \p showIfEmpty is \c false then the implementation
+    may optionally only show the log if it's not empty.
+    */
+    virtual void        show(bool showIfEmpty) = 0;
+
+    //! Write a message with level
+    /*!
+    Writes \c message, which has the given \c level, to a log.
+    If this method returns true then Log will stop passing the
+    message to all outputters in the outputter chain, otherwise
+    it continues.  Most implementations should return true.
+    */
+    virtual bool        write(ELevel level, const char* message) = 0;
+
+    //@}
+};