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diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/UnaryParametrizedRead.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/UnaryParametrizedRead.java
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+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/UnaryParametrizedRead.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.db.common.request;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.request.Read;
+
+public abstract class UnaryParametrizedRead<P, C, R> implements ParametrizedRead<P, R> {
+
+    final protected C constant;
+    
+    public UnaryParametrizedRead(C constant) {
+    	this.constant = constant;
+    }
+	
+	abstract public R perform(ReadGraph graph, P parameter) throws DatabaseException;
+	
+	@Override
+	public Read<R> get(P parameter) {
+		return new BinaryRead<P, C, R>(parameter, constant) {
+
+			@Override
+			public R perform(ReadGraph graph) throws DatabaseException {
+				return UnaryParametrizedRead.this.perform(graph, parameter);
+			}
+			
+		};
+	}
+    
+}