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diff --git a/bundles/org.simantics.document.ui/src/org/simantics/document/ui/actions/AddDocumentAction.java b/bundles/org.simantics.document.ui/src/org/simantics/document/ui/actions/AddDocumentAction.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.document.ui.actions;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.adapter.ActionFactory;
+import org.simantics.document.DocumentResource;
+import org.simantics.document.ui.graphfile.DocumentVersionUtils;
+import org.simantics.document.ui.graphfile.FileDocumentUtil;
+
+/**
+ * Abstract base class for adding documents.
+ * 
+ * If import target is an document, a new version of a document is created.
+ * 
+ * Document version creation has two modes:
+ * FLAT: new version is added to the same library as the old document.
+ * TREE: new version replaces the old document in the library, and old document is moved under the new document.
+ * 
+ * 
+ * @author Marko Luukkainen <marko.luukkainen@vtt.fi>
+ *
+ */
+public abstract class AddDocumentAction implements ActionFactory {
+	
+
+	
+	
+	private Resource relation;
+	
+	public AddDocumentAction(ReadGraph graph, String relationUri) throws DatabaseException {
+		relation = graph.getResource(relationUri);
+	}
+	
+
+	protected Resource getRelation() {
+		return relation;
+	}
+	
+	protected void linkDocument(WriteGraph graph, Resource target, Resource newDocument) throws DatabaseException{
+		DocumentResource doc = DocumentResource.getInstance(graph);
+	
+		if (graph.isInstanceOf(target, doc.Document)) {
+			// adding a new revision
+			DocumentVersionUtils.createNewVersion(graph, target, newDocument, relation);
+			
+			
+		} else {
+			graph.claim(target, relation, newDocument);
+			FileDocumentUtil.createUniqueName(graph, newDocument);
+		}
+	}
+
+}