2 * Copyright (c) 2010-2022 Contributors to the openHAB project
4 * See the NOTICE file(s) distributed with this work for additional
7 * This program and the accompanying materials are made available under the
8 * terms of the Eclipse Public License 2.0 which is available at
9 * http://www.eclipse.org/legal/epl-2.0
11 * SPDX-License-Identifier: EPL-2.0
13 package org.openhab.binding.velux.internal.handler;
15 import org.eclipse.jdt.annotation.NonNullByDefault;
16 import org.eclipse.jdt.annotation.Nullable;
17 import org.openhab.binding.velux.internal.bridge.VeluxBridgeDeviceStatus;
18 import org.openhab.core.thing.ChannelUID;
19 import org.openhab.core.types.State;
20 import org.slf4j.Logger;
21 import org.slf4j.LoggerFactory;
24 * <B>Channel-specific retrieval and modification.</B>
26 * This class implements the Channel <B>status</B> of the Thing <B>klf200</B>:
28 * <LI><I>Velux</I> <B>bridge</B> → <B>OpenHAB</B>:
30 * Information retrieval by method {@link #handleRefresh}.</LI>
33 * @author Guenther Schreiner - Initial contribution.
36 final class ChannelBridgeStatus extends ChannelHandlerTemplate {
37 private static final Logger LOGGER = LoggerFactory.getLogger(ChannelBridgeStatus.class);
40 * ************************
41 * ***** Constructors *****
44 // Suppress default constructor for non-instantiability
46 private ChannelBridgeStatus() {
47 throw new AssertionError();
51 * Communication method to retrieve information to update the channel value.
53 * @param channelUID The item passed as type {@link ChannelUID} for which a refresh is intended.
54 * @param channelId The same item passed as type {@link String} for which a refresh is intended.
55 * @param thisBridgeHandler The Velux bridge handler with a specific communication protocol which provides
56 * information for this channel.
57 * @return newState The value retrieved for the passed channel, or <I>null</I> in case if there is no (new) value.
59 static @Nullable State handleRefresh(ChannelUID channelUID, String channelId,
60 VeluxBridgeHandler thisBridgeHandler) {
61 LOGGER.debug("handleRefresh({},{},{}) called.", channelUID, channelId, thisBridgeHandler);
62 State newState = null;
63 thisBridgeHandler.bridgeParameters.gateway = new VeluxBridgeDeviceStatus()
64 .retrieve(thisBridgeHandler.thisBridge);
65 if (thisBridgeHandler.bridgeParameters.gateway.isRetrieved) {
66 newState = thisBridgeHandler.bridgeParameters.gateway.gwState;
68 LOGGER.trace("handleRefresh() returns {}.", newState);