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diff --git a/source/blender/compositor/intern/COM_Socket.h b/source/blender/compositor/intern/COM_Socket.h
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+++ b/source/blender/compositor/intern/COM_Socket.h
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+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor: 
+ *		Jeroen Bakker 
+ *		Monique Dewanchand
+ */
+
+#ifndef _COM_Socket_h
+#define _COM_Socket_h
+
+#include <vector>
+#include "BKE_text.h"
+#include <string>
+#include "DNA_node_types.h"
+#include "COM_defines.h"
+
+using namespace std;
+class SocketConnection;
+class NodeBase;
+
+/**
+  * @brief Base class for InputSocket and OutputSocket.
+  *
+  * A socket are the points on an node where the user can make a connection between.
+  * Sockets are always part of a node or an operation.
+  *
+  * @see InputSocket
+  * @see OutputSocket
+  * @see SocketConnection - a connection between an InputSocket and an OutputSocket
+  * @ingroup Model
+  */
+class Socket {
+private:
+	/**
+	  * Reference to the node where this Socket belongs to
+	  */
+	NodeBase* node;
+	
+	/**
+	  * the datatype of this socket. Is used for automatically data transformation.
+	  * @section data-conversion
+	  */
+	DataType datatype;
+	
+	/**
+	  * the actual data type during execution. This can be different than the field datatype, based on the conversion rules of the node
+	  * @section data-conversion
+	  */
+	DataType actualType;
+	
+	bNodeSocket* editorSocket;
+public:
+	Socket(DataType datatype);
+	
+	DataType getDataType() const;
+	void setNode(NodeBase* node);
+	NodeBase* getNode() const;
+	
+	/**
+	  * @brief get the actual data type
+	  *
+	  * @note The actual data type can differ from the data type this socket expects.
+	  * @return actual DataType
+	  */
+	DataType getActualDataType() const;
+	
+	/**
+	  * @brief set the actual data type
+	  * @param actualType the new actual type
+	  */
+	void setActualDataType(DataType actualType);
+	
+	const virtual int isConnected() const;
+	int isInputSocket() const;
+	int isOutputSocket() const;
+	virtual void determineResolution(int resolution[], unsigned int preferredResolution[]) {}
+	virtual void determineActualDataType() {}
+	
+	void setEditorSocket(bNodeSocket* editorSocket) {this->editorSocket = editorSocket;}
+	bNodeSocket* getbNodeSocket() const {return this->editorSocket;}
+	
+};
+
+
+#endif