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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/ContextLocal.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/ContextLocal.java
new file mode 100644
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+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/ContextLocal.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.utils.datastructures;
+
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.simantics.utils.datastructures.disposable.AbstractDisposable;
+
+/**
+ * This class provides context-local variables. There is a different value for 
+ * each context. This class handles disposing of all values if optional
+ * disposer is provided.  
+ *
+ * @param <T>
+ */
+public class ContextLocal<T> extends AbstractDisposable {
+	
+	protected ConcurrentHashMap<Object, T> reg = new ConcurrentHashMap<Object, T>();
+	
+	public static interface Disposer<T> {
+		public void dispose(T object);
+	}
+	
+	Disposer<T> disposer;
+	
+	/**
+	 * Creates context-local variable container.
+	 */
+	public ContextLocal() 
+	{		
+	}
+	
+	/**
+	 * Create context-local variable container.
+	 * Container created with this method takes ownership of its object.
+	 * 
+	 * @param disposed
+	 */
+	public ContextLocal(Disposer<T> disposer)
+	{
+		this.disposer = disposer;
+	}
+	
+	/**
+	 * Gets the object associated in the specified context
+	 * 
+	 * @param context
+	 * @return associated Object or <code>null</code> if not found
+	 */
+	public T get(Object context) {
+		return reg.get(context);
+	}
+
+	/**
+	 * Associates the specified Object with the specified context.
+	 * 
+	 * @param context
+	 * @param monitor
+	 */
+	public void replace(Object context, T value) {
+		T old = value != null ? reg.put(context, value) : reg.remove(context);
+		if (old!=null && disposer!=null)
+			disposer.dispose(old);
+	}
+	
+	public void remove(Object context) {
+		replace(context, null);
+	}
+
+	@Override
+	protected void doDispose() {
+		if (disposer!=null)
+			for (T lr : reg.values()) {
+				disposer.dispose(lr);
+			}
+		reg.clear();
+	}
+
+
+}
+