/* * Copyright (c) 2015 Pantheon Technologies s.r.o. and others. 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 */ package org.opendaylight.yangtools.yang.common; import com.google.common.annotations.Beta; import java.io.Serializable; import org.eclipse.jdt.annotation.NonNullByDefault; import org.opendaylight.yangtools.concepts.Immutable; /** * Dedicated singleton type for YANG's 'type empty' value. * * @author Robert Varga */ @Beta @NonNullByDefault public final class Empty implements Immutable, Serializable { private static final long serialVersionUID = 1L; private static final Empty INSTANCE = new Empty(); private Empty() { } public static Empty getInstance() { return INSTANCE; } @Override public String toString() { return "empty"; } @SuppressWarnings("static-method") private Object readResolve() { return INSTANCE; } }