org.kawanfw.sql.json.ObjectArrayTransport.java Source code

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Here is the source code for org.kawanfw.sql.json.ObjectArrayTransport.java

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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 org.json.simple.JSONArray;
import org.json.simple.JSONValue;
import org.kawanfw.commons.util.FrameworkDebug;

/**
 * @author Nicolas de Pomereu
 * 
 *         Class to transport Object arrays between PC and Host with JSON
 */
public class ObjectArrayTransport {

    /** Debug flag */
    private static boolean DEBUG = FrameworkDebug.isSet(ObjectArrayTransport.class);

    /**
     * 
     */
    protected ObjectArrayTransport() {
    }

    /**
     * Format for JSON String a string array
     * 
     * @param StringArray
     *            a string array
     * 
     * @return the formated JSON string ready for transport
     */

    @SuppressWarnings("unchecked")
    public static String toJson(Object[] objectArray) {

        JSONArray jsonArray = new JSONArray();

        for (int i = 0; i < objectArray.length; i++) {
            jsonArray.add(objectArray[i]);
        }

        String jsonString = jsonArray.toJSONString();
        debug("jsonString: " + jsonString);
        return jsonString;
    }

    /**
     * Transform a Json string to an array of Objects
     * 
     * @param jsonString
     *            the json formatted string
     * @return the corresponding decoded array of Objects
     */
    public static Object[] fromJson(String jsonString) {
        // Gson gson = new Gson();
        // String[] types = gson.fromJson(jsonString, String[].class);
        // return types;

        debug("in public static Object[] fromJson(String jsonString)");

        Object obj = JSONValue.parse(jsonString);
        JSONArray jsonArray = (JSONArray) obj;

        Object objectArray[] = new Object[jsonArray.size()];

        for (int i = 0; i < jsonArray.size(); i++) {
            objectArray[i] = jsonArray.get(i);
        }

        // free objects
        obj = null;
        jsonArray = null;

        return objectArray;

    }

    /**
     * Debug
     * 
     * @param s
     */
    public static void debug(String s) {
        if (DEBUG) {
            System.out.println(s);
        }
    }
}