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/*
* Copyright (C) 2021 Samsung Electronics
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package org.onap.rapp.datacollector.service;
import static java.util.Objects.nonNull;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import org.onap.rapp.datacollector.entity.ves.AdditionalMeasurements;
import org.onap.rapp.datacollector.entity.ves.CommonEventHeader;
import org.onap.rapp.datacollector.entity.ves.Event;
import org.onap.rapp.datacollector.entity.ves.MeasurementFields;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
@Service
public class VesParserImpl extends ParserAbstractClass implements VesParser {
private static final Logger logger = LoggerFactory.getLogger(VesParserImpl.class);
/**
* Parse incoming Json string into list of Events
*
* @param eventString json from PM Mapper
* @return list of events
*/
@Override
public List<Event> parse(final String eventString) {
logger.debug("parsing ves event {}", eventString);
Event event = gson.fromJson(eventString, Event.class);
event.raw = eventString;
return Collections.singletonList(event);
}
/**
* Class which deserialize json event into Event object
*/
private static class VesEventDeserializer implements JsonDeserializer<Event> {
private static class AdditionalMeasurementsRawValue {
String name;
Map<String, String> hashMap;
}
@Override
public Event deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
Optional<JsonObject> eventJsonObject = getEventJsonObject(jsonElement);
CommonEventHeader header = getHeaderJsonObject(eventJsonObject.orElse(null), jsonDeserializationContext);
Optional<MeasurementFields> measurementFields;
List<AdditionalMeasurements> additionalMeasurements = new ArrayList<>();
Optional<JsonObject> vesEventJson = getVesEventJson(eventJsonObject.orElse(null));
if (vesEventJson.isPresent()) {
measurementFields = Optional.ofNullable(jsonDeserializationContext.deserialize(vesEventJson.get(), MeasurementFields.class));
if (vesEventJson.get().has("additionalMeasurements")) {
JsonArray additionalMeasurementsArray = vesEventJson.get().getAsJsonArray("additionalMeasurements");
additionalMeasurements = new ArrayList<>();
for (int i = 0; i < additionalMeasurementsArray.size(); i++) {
AdditionalMeasurementsRawValue tmp = jsonDeserializationContext
.deserialize(additionalMeasurementsArray.get(i).getAsJsonObject(), AdditionalMeasurementsRawValue.class);
additionalMeasurements.add(AdditionalMeasurements.builder()
.withName(tmp.name)
.withHashMap(tmp.hashMap)
.build());
}
}
logger.trace("measurement fields {}", measurementFields);
logger.trace("additional measurements {}", additionalMeasurements);
measurementFields = Optional.of(MeasurementFields.builder()
.measurementInterval(measurementFields.orElse(MeasurementFields.EMPTY).measurementInterval)
.additionalMeasurements(additionalMeasurements)
.build());
return Event.of(header, measurementFields.get());
} else {
logger.error("MeasurementFields was not found {}", eventJsonObject);
throw new JsonParseException("MeasurementFields was not found");
}
}
private Optional<JsonObject> getVesEventJson(JsonObject obj) {
return Optional.ofNullable(nonNull(obj) ? obj.getAsJsonObject(VES_EVENT_UNIQUE_ELEMENT) : null);
}
}
private final Gson gson = new GsonBuilder()
.registerTypeAdapter(Event.class, new VesEventDeserializer()).create();
}
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