import java.util.Collections;
import org.opendaylight.openflowplugin.api.OFConstants;
-import org.opendaylight.openflowplugin.api.openflow.device.DeviceContext;
import org.opendaylight.openflowplugin.api.openflow.device.DeviceState;
import org.opendaylight.openflowplugin.api.openflow.device.MessageTranslator;
import org.opendaylight.openflowplugin.openflow.md.util.PortTranslatorUtil;