ayyoob
8 years ago
parent
3a7536f1f6
commit
9dc836928c
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/*
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* Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
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*
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* WSO2 Inc. licenses this file to you under the Apache License,
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* Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.wso2.carbon.device.mgt.input.adapter.extension.transformer;
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import com.jayway.jsonpath.JsonPath;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.json.simple.JSONArray;
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import org.json.simple.JSONObject;
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import org.json.simple.parser.JSONParser;
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import org.json.simple.parser.ParseException;
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import org.wso2.carbon.device.mgt.input.adapter.extension.ContentTransformer;
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import java.util.Map;
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/**
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* This holds the default implementation of ContentTransformer
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*/
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public class MQTTContentTransformer implements ContentTransformer {
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private static final String MQTT_CONTENT_TRANSFORMER = "iot-mqtt";
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private static final String TOPIC = "topic";
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private static String JSON_ARRAY_START_CHAR = "[";
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private static final Log log = LogFactory.getLog(MQTTContentTransformer.class);
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@Override
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public String getType() {
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return MQTT_CONTENT_TRANSFORMER;
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}
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@Override
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public Object transform(Object messagePayload, Map<String, Object> dynamicProperties) {
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String topic = (String) dynamicProperties.get(TOPIC);
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String topics[] = topic.split("/");
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String deviceId = topics[2];
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String deviceType = topics[1];
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String message = (String) messagePayload;
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try {
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if (message.startsWith(JSON_ARRAY_START_CHAR)) {
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return processMultipleEvents(message, deviceId, deviceType);
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} else {
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return processSingleEvent(message, deviceId, deviceType);
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}
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} catch (ParseException e) {
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log.error("Invalid input " + message, e);
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return false;
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}
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}
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private String processSingleEvent(String msg, String deviceIdFromTopic, String deviceIdJsonPath)
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throws ParseException {
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JSONParser parser = new JSONParser();
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JSONObject jsonObject = new JSONObject();
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jsonObject.put("deviceId", deviceIdFromTopic);
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JSONObject eventObject = new JSONObject();
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eventObject.put("payloadData", parser.parse(msg));
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eventObject.put("metaData", jsonObject);
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JSONObject event = new JSONObject();
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event.put("event", eventObject);
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return event.toJSONString();
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}
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private String processMultipleEvents(String msg, String deviceIdFromTopic, String deviceIdJsonPath)
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throws ParseException {
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JSONParser jsonParser = new JSONParser();
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JSONArray jsonArray = (JSONArray) jsonParser.parse(msg);
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JSONArray eventsArray = new JSONArray();
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for (int i = 0; i < jsonArray.size(); i++) {
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eventsArray.add(i, processSingleEvent(jsonArray.get(i).toString(), deviceIdFromTopic, deviceIdJsonPath));
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}
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return eventsArray.toJSONString();
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}
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}
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