org.rssin.serialization.JsonSerializer.java Source code

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Here is the source code for org.rssin.serialization.JsonSerializer.java

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/**
 * RSSin - Clever RSS reader for Android
 * Copyright (C) 2015 Randy Wanga, Jos Craaijo, Joep Bernards, Camil Staps
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 2 of the License, or 
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package org.rssin.serialization;

import org.json.JSONArray;
import org.json.JSONException;

import java.util.ArrayList;
import java.util.List;

/**
 * Common tools for JSON serialization
 * @author
 */
public class JsonSerializer {

    /**
     * Make a JSONArray from a List<? extends Jsonable>
     * @param list the list to serialize
     * @return the JSONArray
     * @throws JSONException if this happens, it should be a problem in the Jsonable's toJson
     */
    public static JSONArray listToJson(List<? extends Jsonable> list) throws JSONException {
        JSONArray json = new JSONArray();
        for (Jsonable item : list) {
            json.put(item.toJson());
        }
        return json;
    }

    public static JSONArray numbersListToJson(List<? extends Number> list) throws JSONException {
        JSONArray json = new JSONArray();
        for (Number item : list) {
            json.put(item);
        }
        return json;
    }

    /**
     * Read a JSONArray into a List<? extends Jsonable>
     * Items are read until either the JSONArray is empty or the List is full.
     *
     * @param json the JSONArray
     * @param list the list to read into
     * @throws JSONException
     */
    public static void listFromJson(JSONArray json, List<? extends Jsonable> list) throws JSONException {
        for (int i = 0; i < json.length() && i < list.size(); i++) {
            list.get(i).fromJson(json.getJSONObject(i));
        }
    }

    public static List<Integer> integersListFromJson(JSONArray json) throws JSONException {
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < json.length(); i++) {
            list.add(json.getInt(i));
        }
        return list;
    }

}