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diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/modifiers/AbstractEnumerationModifier.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/modifiers/AbstractEnumerationModifier.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.modifiers;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.simantics.browsing.ui.content.Labeler.EnumerationModifier;
+
+/**
+ * A trivial EnumerationModifier base implementation
+ * 
+ * @author Tuukka Lehtonen
+ */
+public abstract class AbstractEnumerationModifier<T> implements EnumerationModifier {
+
+    private final Enumeration<T>     enumeration;
+    private final EnumeratedValue<T> value;
+    private final List<String>       values;
+
+    public AbstractEnumerationModifier(Enumeration<T> enumeration, EnumeratedValue<T> value) {
+        assert enumeration != null;
+        assert enumeration.size() > 0;
+
+        this.enumeration = enumeration;
+        this.value = value;
+
+        this.values = new ArrayList<String>(enumeration.size());
+        for (EnumeratedValue<T> v : enumeration.values())
+            values.add(v.getName());
+    }
+
+    @Override
+    public final List<String> getValues() {
+        return values;
+    }
+
+    @Override
+    public final String getValue() {
+        if (value != null)
+            return value.getName();
+        return enumeration.values().get(0).getName();
+    }
+
+    @Override
+    public final String isValid(String label) {
+        if (!values.contains(label))
+            return "Value '" + label + "' is not among the enumerated values " + values;
+        return null;
+    }
+
+    @Override
+    public final void modify(String label) {
+        int index = values.indexOf(label);
+        if (index == -1)
+            throw new IllegalArgumentException("Cannot modify enumeration with value '" + label + "', not among the enumerated values " + values);
+        modifyWithValue(value, enumeration.values().get(index));
+    }
+
+    protected void modifyWithValue(EnumeratedValue<T> oldEnumValue, EnumeratedValue<T> enumValue) {
+        T oldObject = oldEnumValue != null ? oldEnumValue.getObject() : null;
+        T newObject = enumValue != null ? enumValue.getObject() : null;
+        modifyWithObject(oldObject, newObject);
+    }
+
+    /**
+     * At least implement this if you don't override
+     * {@link #modifyWithValue(EnumeratedValue, EnumeratedValue)}.
+     * 
+     * @param oldEnumObject
+     * @param enumObject
+     */
+    protected void modifyWithObject(T oldEnumObject, T enumObject) {
+    }
+
+};