2 * Copyright (c) 2017 Pantheon Technologies, s.r.o. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.yangtools.yang.model.api;
10 import com.google.common.annotations.Beta;
11 import java.util.Optional;
12 import org.opendaylight.yangtools.yang.xpath.api.YangXPathExpression.QualifiedBound;
15 * Mix-in interface for nodes which can be conditional on a when statement.
17 * @author Robert Varga
20 public interface WhenConditionAware {
22 * Returns when statement.
25 * If when condition is present node defined by the parent data definition
26 * statement is only valid when the returned XPath
27 * expression conceptually evaluates to "true"
28 * for a particular instance, then the node defined by the parent data
29 * definition statement is valid; otherwise, it is not.
31 * @return XPath condition
33 Optional<? extends QualifiedBound> getWhenCondition();