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diff --git a/bundles/org.simantics.mapping/src/org/simantics/mapping/rule/IfRule.java b/bundles/org.simantics.mapping/src/org/simantics/mapping/rule/IfRule.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.mapping.rule;
+
+import gnu.trove.map.hash.TObjectIntHashMap;
+
+import org.simantics.db.Resource;
+import org.simantics.mapping.constraint.IConstraint;
+import org.simantics.mapping.constraint.TooManyUnboundVariablesException;
+import org.simantics.mapping.constraint.instructions.IInstruction;
+import org.simantics.mapping.rule.instructions.IRuleInstruction;
+import org.simantics.mapping.rule.instructions.IfRuleInstruction;
+import org.simantics.utils.datastructures.persistent.ImmutableSet;
+
+public class IfRule implements IRule {
+
+	IConstraint condition;
+	IRule thenRule;
+	IRule elseRule;
+	
+	public IfRule(IConstraint condition, IRule thenRule, IRule elseRule) {
+		this.condition = condition;		
+		this.thenRule = thenRule;
+		this.elseRule = elseRule;
+	}
+	
+	public IfRule(IConstraint condition, IRule thenRule) {
+		this(condition, thenRule, null);
+	}
+
+	@Override
+	public ImmutableSet<Resource> binds() {
+		ImmutableSet<Resource> ret = condition.binds().addAll(thenRule.binds());
+		if(elseRule != null)
+			ret = ret.addAll(elseRule.binds());
+		return ret;
+	}
+
+	@Override
+	public IRuleInstruction createInstruction(
+			TObjectIntHashMap<Resource> variableIds,
+			ImmutableSet<Resource> bound) throws TooManyUnboundVariablesException {
+		IInstruction conditionInstruction = 
+			condition.createInstruction(variableIds, bound);
+		bound = bound.addAll(condition.binds());
+		return new IfRuleInstruction(conditionInstruction, 
+				thenRule.createInstruction(variableIds, bound),
+				elseRule == null ? null : elseRule.createInstruction(variableIds, bound));
+	}
+
+}