2 * Copyright (c) 2018 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.stmt;
10 import com.google.common.annotations.Beta;
11 import java.util.Optional;
12 import javax.annotation.Nullable;
13 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
16 * Marker interface for statements which may contain a 'mandatory' statement, as defined in RFC7950.
19 public interface MandatoryStatementAwareDeclaredStatement<T> extends DeclaredStatement<T>,
20 MandatoryStatementContainer {
22 * Return a {@link MandatoryStatement} child, if present.
24 * @return A {@link MandatoryStatement}, or null if none is present.
27 default @Nullable MandatoryStatement getMandatory() {
28 final Optional<MandatoryStatement> opt = findFirstDeclaredSubstatement(MandatoryStatement.class);
29 return opt.isPresent() ? opt.get() : null;