org.kawanfw.sql.json.ObjectArrayTransport Maven / Gradle / Ivy

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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);
	}
    }
}