org.pascani.dsl.dbmapper.JsonUtility.java Source code

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Here is the source code for org.pascani.dsl.dbmapper.JsonUtility.java

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/*
 * Copyright  2015 Universidad Icesi
 * 
 * This file is part of the Pascani project.
 * 
 * The Pascani project is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * The Pascani project is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with The Pascani project. If not, see <http://www.gnu.org/licenses/>.
 */
package org.pascani.dsl.dbmapper;

import java.util.UUID;

import org.pascani.dsl.dbmapper.typeadapters.TransientExclusionStrategy;
import org.pascani.dsl.dbmapper.typeadapters.UUIDDeserializer;
import org.pascani.dsl.dbmapper.typeadapters.UUIDInstanceCreator;
import org.pascani.dsl.dbmapper.typeadapters.UUIDSerializer;
import org.pascani.dsl.lib.Event;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

/**
 * @author Miguel Jimnez - Initial contribution and API
 */
public class JsonUtility {

    /**
     * The instance to convert from/to json
     */
    private final Gson gson;

    public JsonUtility() {
        this.gson = buildGson();
    }

    private Gson buildGson() {
        GsonBuilder builder = new GsonBuilder();
        builder.registerTypeAdapter(UUID.class, new UUIDInstanceCreator());
        builder.registerTypeAdapter(UUID.class, new UUIDSerializer());
        builder.registerTypeAdapter(UUID.class, new UUIDDeserializer());
        builder.setExclusionStrategies(new TransientExclusionStrategy());
        return builder.create();
    }

    /**
     * Converts an object to Json format
     * 
     * @param obj
     *            The object to convert to Json
     * @return The Json representation of the given object
     */
    public String toJson(Object obj) {
        return gson.toJson(obj);
    }

    /**
     * Converts an object from Json format to Object
     * 
     * @param json
     *            The Json representation of the desired object
     * @param type
     *            The object type
     * @return An Object representation of the given Json data
     */
    public <T extends Event<?>> T fromJson(String json, Class<T> type) {
        return gson.fromJson(json, type);
    }

}