/*
 * Copyright (c) 2013 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.controller.protocol_plugin.openflow.internal;

import org.openflow.protocol.OFPort;

import org.opendaylight.controller.sal.core.Node;
import org.opendaylight.controller.sal.core.NodeConnector;
import org.opendaylight.controller.sal.core.NodeConnector.NodeConnectorIDType;
import org.opendaylight.controller.sal.utils.NodeConnectorCreator;

/**
 * Abstract class which provides the utilities for converting
 * the Openflow port number to the equivalent NodeConnector and vice versa
 *
 *
 *
 */
public abstract class PortConverter {
    private static final int maxOFPhysicalPort = (OFPort.OFPP_MAX.getValue() & 0x7FFF) | 0x8000;

    /**
     * Converts the Openflow port number to the equivalent NodeConnector.
     */
    public static NodeConnector toNodeConnector(short ofPort, Node node) {
        // Restore original OF unsigned 16 bits value for the comparison
        int unsignedOFPort = (ofPort & 0x7FFF) | 0x8000;

        if (unsignedOFPort > maxOFPhysicalPort) {
            if (ofPort == OFPort.OFPP_LOCAL.getValue()) {
                return NodeConnectorCreator.createNodeConnector(
                        NodeConnectorIDType.SWSTACK,
                        NodeConnector.SPECIALNODECONNECTORID, node);
            } else if (ofPort == OFPort.OFPP_NORMAL.getValue()) {
                return NodeConnectorCreator.createNodeConnector(
                        NodeConnectorIDType.HWPATH,
                        NodeConnector.SPECIALNODECONNECTORID, node);
            } else if (ofPort == OFPort.OFPP_CONTROLLER.getValue()) {
                return NodeConnectorCreator.createNodeConnector(
                        NodeConnectorIDType.CONTROLLER,
                        NodeConnector.SPECIALNODECONNECTORID, node);
            }
        }
        return NodeConnectorCreator.createNodeConnector(ofPort, node);
    }

    /**
     * Converts the NodeConnector to the equivalent Openflow port number
     */
    public static short toOFPort(NodeConnector salPort) {
        if (salPort.getType().equals(NodeConnectorIDType.SWSTACK)) {
            return OFPort.OFPP_LOCAL.getValue();
        } else if (salPort.getType().equals(
                NodeConnectorIDType.HWPATH)) {
            return OFPort.OFPP_NORMAL.getValue();
        } else if (salPort.getType().equals(
                NodeConnectorIDType.CONTROLLER)) {
            return OFPort.OFPP_CONTROLLER.getValue();
        }
        return (Short) salPort.getID();
    }
}