it.polimi.tower4clouds.data_analyzer.DAInputDataUnmarshaller.java Source code

Introduction

Here is the source code for it.polimi.tower4clouds.data_analyzer.DAInputDataUnmarshaller.java

Source

/**
 * Copyright (C) 2014 Politecnico di Milano (marco.miglierina@polimi.it)
 *
 * 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 it.polimi.tower4clouds.data_analyzer;

import it.polimi.deib.rsp_services_csparql.streams.utilities.InputDataUnmarshaller;
import it.polimi.tower4clouds.model.ontology.MO;

import java.util.Map.Entry;
import java.util.UUID;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonPrimitive;
import com.hp.hpl.jena.datatypes.xsd.XSDDatatype;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.vocabulary.RDF;

public class DAInputDataUnmarshaller implements InputDataUnmarshaller {

    private static Logger logger = LoggerFactory.getLogger(DAInputDataUnmarshaller.class);
    private JsonParser jsonParser = new JsonParser();

    @Override
    public Model unmarshal(String inputData) throws Exception {
        //      logger.debug("Unmarshalling data");
        //      long startTime = System.currentTimeMillis();
        Model model = ModelFactory.createDefaultModel();

        JsonArray jsonData = jsonParser.parse(inputData).getAsJsonArray();
        //      logger.debug("{} monitoring datum json object(s) received",
        //            jsonData.size());

        for (JsonElement jsonElement : jsonData) {
            JsonObject jsonDatum = jsonElement.getAsJsonObject();
            Resource resourceDatum = model.createResource(UUID.randomUUID().toString()).addProperty(RDF.type,
                    MO.MonitoringDatum);
            for (Entry<String, JsonElement> pair : jsonDatum.entrySet()) {
                String property = pair.getKey();
                JsonPrimitive value = pair.getValue().getAsJsonPrimitive();
                if (value.isBoolean()) {
                    resourceDatum.addProperty(MO.makeProperty(property),
                            model.createTypedLiteral(value.getAsBoolean(), XSDDatatype.XSDboolean));
                } else if (value.isString()) {
                    resourceDatum.addProperty(MO.makeProperty(property),
                            model.createTypedLiteral(value.getAsString(), XSDDatatype.XSDstring));
                } else if (value.isNumber()) {
                    resourceDatum.addProperty(MO.makeProperty(property),
                            model.createTypedLiteral(value.getAsNumber().doubleValue(), XSDDatatype.XSDdouble));
                } else {
                    logger.error("Unknown datum property: {}", value);
                }
            }
        }
        //      logger.debug("Unmarshalling completed in {} seconds",
        //            ((double) (System.currentTimeMillis() - startTime)) / 1000);

        return model;
    }

}