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.mqtt.homeassistant.internal.config;
15 import java.lang.reflect.Type;
17 import org.eclipse.jdt.annotation.NonNullByDefault;
18 import org.eclipse.jdt.annotation.Nullable;
19 import org.openhab.binding.mqtt.homeassistant.internal.config.dto.Connection;
21 import com.google.gson.JsonArray;
22 import com.google.gson.JsonDeserializationContext;
23 import com.google.gson.JsonDeserializer;
24 import com.google.gson.JsonElement;
25 import com.google.gson.JsonParseException;
28 * The {@link ConnectionDeserializer} will de-serialize a connection-list
30 * see: https://www.home-assistant.io/integrations/sensor.mqtt/#connections
32 * @author Jan N. Klug - Initial contribution
35 public class ConnectionDeserializer implements JsonDeserializer<Connection> {
37 public @Nullable Connection deserialize(@Nullable JsonElement json, Type typeOfT,
38 JsonDeserializationContext context) throws JsonParseException {
41 throw new JsonParseException("JSON element is null, but must be connection definition.");
44 list = json.getAsJsonArray();
45 } catch (IllegalStateException e) {
46 throw new JsonParseException("""
47 Cannot parse JSON array. Each connection must be defined as array with two \
48 elements: connection_type, connection identifier. For example: "connections": [["mac", \
49 "02:5b:26:a8:dc:12"]]\
52 if (list.size() != 2) {
53 throw new JsonParseException("Connection information must be a tuple, but has " + list.size()
54 + " elements! For example: " + "\"connections\": [[\"mac\", \"02:5b:26:a8:dc:12\"]]");
56 return new Connection(list.get(0).getAsString(), list.get(1).getAsString());