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/*
 * This file is part of AceQL. 
 * AceQL: Remote JDBC access over HTTP.                                     
 * Copyright (C) 2015,  KawanSoft SAS
 * (http://www.kawansoft.com). All rights reserved.                                
 *                                                                               
 * AceQL 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 2.1 of the License, or (at your option) any later version.            
 *                                                                               
 * AceQL 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 this library; if not, write to the Free Software           
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  
 * 02110-1301  USA
 *
 * Any modifications to this file must keep this entire header
 * intact.
 */
package org.kawanfw.sql.json;

import java.lang.reflect.Type;
import java.util.List;

import org.kawanfw.commons.util.FrameworkDebug;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

/**
 * Class to use to transport result set lines in Json format using Google GSON
 * 
 * @author Nicolas de Pomereu
 * 
 */
public class StringListTransportGson {

    /** For debug info */
    private static boolean DEBUG = FrameworkDebug
	    .isSet(StringListTransportGson.class);

    /**
     * Format for JSON String List of a result set line values
     * 
     * @param list
     *            the List of a result set line
     * 
     * @return the formated JSON string ready for transport
     */

    public static String toJson(List list) {
	if (list == null) {
	    throw new IllegalArgumentException("resultSetLine is null!");
	}

	Gson gson = new Gson();
	Type listOfStringsType = new TypeToken>() {
	}.getType();
	String jsonString = gson.toJson(list, listOfStringsType);
	return jsonString;
    }

    /**
     * Format from JSON string List a result set line of values
     * 
     * @param jsonString
     *            formated JSON string List a result set line values
     * 
     * @return a list of ordered strings for the result set line
     */
    public static List fromJson(String jsonString) {
	if (jsonString == null) {
	    throw new IllegalArgumentException("jsonString is null!");
	}

	Gson gson = new Gson();
	Type listOfStringsType = new TypeToken>() {
	}.getType();
	List line = gson.fromJson(jsonString, listOfStringsType);
	return line;

    }

    @SuppressWarnings("unused")
    private static void debug(String s) {
	if (DEBUG) {
	    System.out.println(s);
	}
    }

}