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diff --git a/bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/internal/IndexChangedWriter.java b/bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/internal/IndexChangedWriter.java
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+/*******************************************************************************
+ * Copyright (c) 2017 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:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.indexing.internal;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * An internal in-memory container for telling whether a certain index has been
+ * changed since the platform was last started up. 
+ * 
+ * @author Jussi Koskela
+ * @since 1.28.0
+ */
+public class IndexChangedWriter {
+	private Set<String> dirtyFiles = new HashSet<>();
+
+	public synchronized boolean markDirty(File dirtyFile) throws IOException {
+		return dirtyFiles.add(dirtyFile.getAbsolutePath());
+	}
+}