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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Pair.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Pair.java
new file mode 100644
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+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Pair.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;
+
+
+/**
+ * A generic Pair (2-tuple) structure for containing two object instances of
+ * chosen types.
+ * 
+ * @param <T1> type of first element
+ * @param <T2> type of second element
+ */
+public final class Pair<T1, T2> implements Comparable<Pair<T1, T2>> {
+    public final T1 first;
+    public final T2 second;
+    private final int hash;
+
+    public static <T1, T2> Pair<T1, T2> make(T1 t1, T2 t2) {
+        return new Pair<T1, T2>(t1, t2);
+    }
+
+    public Pair(T1 first, T2 second) {
+        //assert(first != null);
+        //assert(second != null);
+        
+        this.first = first;
+        this.second = second;
+        this.hash = makeHash();
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null)
+            return false;
+        if (!(obj.getClass().equals(this.getClass())))
+            return false;
+        Pair<?, ?> other = (Pair<?, ?>) obj;
+        if (other.first != first && (other.first == null || !other.first.equals(first)))
+            return false;
+        if (other.second != second && (other.second == null || !other.second.equals(second)))
+            return false;
+        return true;
+    }
+    
+    @Override
+    public int hashCode() {
+        return hash;
+    }
+    
+    @Override
+    public String toString() {
+        return "<"+first+", "+second+">";
+    }
+    
+    private int makeHash() {
+        return (first == null ? 0 : first.hashCode()) + (second == null ? 0 : second.hashCode())*31;
+    }
+
+	@Override
+	public int compareTo(Pair<T1, T2> arg0) {
+		return hash - arg0.hash;
+	}
+	
+}