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diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/contributor/ComparableContributorImpl.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/contributor/ComparableContributorImpl.java
new file mode 100644
index 000000000..87b9a886f
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+++ b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/contributor/ComparableContributorImpl.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.browsing.ui.common.contributor;
+
+import org.simantics.browsing.ui.Tester;
+import org.simantics.browsing.ui.content.ComparableContextFactory;
+import org.simantics.browsing.ui.content.Contributor;
+import org.simantics.utils.ReflectionUtils;
+
+/**
+ * @author Tuukka Lehtonen
+ *
+ * @param <T> input object types to use this comparable contributor for
+ */
+public abstract class ComparableContributorImpl<T> implements Contributor<ComparableContextFactory> {
+
+    private final Class<?> clazz;
+
+    public ComparableContributorImpl() {
+        this.clazz = ReflectionUtils.getSingleParameterType(getClass());
+    }
+
+    public ComparableContributorImpl(Class<?> clazz) {
+        this.clazz = clazz;
+    }
+
+    @Override
+    public Tester getNodeContextTester() {
+        return null;
+    }
+
+    @Override
+    public Class<?> getInputClass() {
+        return clazz;
+    }
+
+    @Override
+    public abstract ComparableContextFactory getFactory();
+
+}