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.Command;
19 import org.openhab.core.types.State;
22 * <B>Channel-specific retrieval and modification.</B>
24 * This class implements the Channel <B>VShutter</B> :
26 * <LI><I>Velux</I> <B>bridge</B> → <B>OpenHAB</B>:
28 * Information retrieval by method {@link #handleRefresh}.</LI>
31 * <LI><B>OpenHAB</B> Event Bus → <I>Velux</I> <B>bridge</B>
33 * Sending commands and value updates by method {@link #handleCommand}.</LI>
36 * @author Guenther Schreiner - Initial contribution.
39 abstract class ChannelHandlerTemplate {
42 * Communication method to retrieve information to update the channel value.
44 * @param channelUID The item passed as type {@link ChannelUID} for which a refresh is intended.
45 * @param channelId The same item passed as type {@link String} for which a refresh is intended.
46 * @param thisBridgeHandler The Velux bridge handler with a specific communication protocol which provides
47 * information for this channel.
48 * @return <B>newValue</B> The value retrieved for the passed channel, or <I>null</I> in case if there is no (new)
51 static @Nullable State handleRefresh(ChannelUID channelUID, String channelId,
52 VeluxBridgeHandler thisBridgeHandler) {
53 throw new IllegalStateException("handleRefresh hasn't been set up in the subclass");
57 * Communication method to update the real world according to the passed channel value (or command).
59 * @param channelUID The item passed as type {@link ChannelUID} for which to following command is addressed to.
60 * @param channelId The same item passed as type {@link String} for which a refresh is intended.
61 * @param command The command passed as type {@link Command} for the mentioned item.
62 * @param thisBridgeHandler The Velux bridge handler with a specific communication protocol which provides
63 * information for this channel.
64 * @return <B>newValue</B> value to be assigned to the channel by BaseThingHandler.postUpdate, or <I>null</I>, if
67 static @Nullable Command handleCommand(ChannelUID channelUID, String channelId, Command command,
68 VeluxBridgeHandler thisBridgeHandler) {
69 throw new IllegalStateException("handleRefresh hasn't been set up in the subclass");