/*
 * Copyright (c) 2016 Cisco Systems, Inc. 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.netconf.topology.impl;

import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
import org.opendaylight.yangtools.yang.binding.Identifier;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;

public final class TopologyUtil {

    private TopologyUtil() {
        throw new AssertionError("Instantiating utility class.");
    }

    /**
     * Determines the Netconf Node Node ID, given the node's instance
     * identifier.
     *
     * @param pathArgument Node's path argument
     * @return     NodeId for the node
     */
    public static NodeId getNodeId(final InstanceIdentifier.PathArgument pathArgument) {
        if (pathArgument instanceof InstanceIdentifier.IdentifiableItem<?, ?>) {

            final Identifier key = ((InstanceIdentifier.IdentifiableItem) pathArgument).getKey();
            if (key instanceof NodeKey) {
                return ((NodeKey) key).getNodeId();
            }
        }
        throw new IllegalStateException("Unable to create NodeId from: " + pathArgument);
    }

    public static KeyedInstanceIdentifier<Topology, TopologyKey> createTopologyListPath(final String topologyId) {
        final InstanceIdentifier<NetworkTopology> networkTopology = InstanceIdentifier.create(NetworkTopology.class);
        return networkTopology.child(Topology.class, new TopologyKey(new TopologyId(topologyId)));
    }
}