2 * Copyright (c) 2010-2023 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.core.thing.ChannelUID;
18 import org.openhab.core.types.State;
21 * <B>Channel-specific retrieval and modification.</B>
23 * This class implements the Channel <B>VShutter</B> :
25 * <LI><I>Velux</I> <B>bridge</B> → <B>OpenHAB</B>:
27 * Information retrieval by method {@link #handleRefresh}.</LI>
30 * @author Guenther Schreiner - Initial contribution.
33 abstract class PropertyHandlerTemplate {
36 * Communication method to retrieve information to update the property value.
38 * @param channelUID The item passed as type {@link ChannelUID} for which a refresh is intended.
39 * @param channelId The same item passed as type {@link String} for which a refresh is intended.
40 * @param thisBridgeHandler The Velux bridge handler with a specific communication protocol which provides
41 * information for this channel.
42 * @return <B>newValue</B> The value retrieved for the passed channel, or <I>null</I> in case if there is no (new)
45 static @Nullable State handleRefresh(ChannelUID channelUID, String channelId,
46 VeluxBridgeHandler thisBridgeHandler) {
47 throw new IllegalStateException("handleRefresh hasn't been set up in the subclass");