br.unicamp.cst.trafficUnjammer.experiments.communication.JsonHandler.java Source code

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Here is the source code for br.unicamp.cst.trafficUnjammer.experiments.communication.JsonHandler.java

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/*******************************************************************************
 * Copyright (c) 2016  DCA-FEEC-UNICAMP
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution, and is available at
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Contributors:
 *     A. L. O. Paraense, R. R. Gudwin - initial implementation
 ******************************************************************************/
package br.unicamp.cst.trafficUnjammer.experiments.communication;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectReader;

/**
 * @author andre
 *
 */
public class JsonHandler {

    public JsonHandler() {
    }

    /**
     * Convert a String to a Object from a specific class
     * @param <T>
     * @param objectClass
     * @param jsonData
     * @return
     */
    public <T> Object fromJsonDataToObject(Class<T> objectClass, String jsonData) {

        ObjectMapper mapper = new ObjectMapper();
        ObjectReader reader = mapper.reader(objectClass);
        T parsed = null;
        try {
            parsed = reader.readValue(jsonData);
        } catch (JsonProcessingException e) {

        } catch (IOException e) {

        }

        return parsed;
    }

    /**
     * Convert an object to String json formatted using GOOGLE GSON API
     * @param object
     * @return
     */
    public String fromObjectToJsonData(Object object) {
        ObjectMapper mapper = new ObjectMapper();
        Writer strWriter = new StringWriter();

        try {
            mapper.writeValue(strWriter, object);
        } catch (JsonGenerationException e) {

        } catch (JsonMappingException e) {

        } catch (IOException e) {

        }

        String jsonData = strWriter.toString();
        return jsonData;
    }

    /**
     *
     * @param typerefence
     * @param objectNodeBase
     * @param jsonData
     * @return
     */
    public <T> ArrayList<Object> fromJsonDataToListOfObject(TypeReference<T> typerefence, String jsonData) {

        ObjectMapper mapper = new ObjectMapper();
        ArrayList<Object> parsed = null;
        try {

            JsonNode node = mapper.readTree(jsonData);
            parsed = mapper.readValue(node.traverse(), typerefence);

        } catch (JsonProcessingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return parsed;
    }
}