com.enterprisemath.utils.JSONUtils Maven / Gradle / Ivy

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package com.enterprisemath.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import org.json.JSONArray;
import org.json.JSONObject;

/**
 * Utilities to work with JSON.
 *
 * @author radek.hecl
 */
public class JSONUtils {

    /**
     * Prevents construction.
     */
    private JSONUtils() {
    }

    /**
     * Encodes string map as a JSON object
     *
     * @param data data
     * @return encoded string
     */
    public static String encodeStringMap(Map data) {
        SortedMap sorted = new TreeMap(PropertyStringComparator.create());
        sorted.putAll(data);
        List items = new ArrayList();
        for (String key : sorted.keySet()) {
            JSONObject item = new JSONObject();
            item.put("key", key);
            item.put("value", sorted.get(key));
            items.add(item);
        }
        JSONArray array = new JSONArray(items);
        return array.toString();
    }

    /**
     * Decodes string map from the JSON object.
     *
     * @param data data
     * @return decoded map
     */
    public static Map decodeStringMap(String data) {
        Map res = new HashMap();
        JSONArray array = new JSONArray(data);
        for (int i = 0; i < array.length(); ++i) {
            JSONObject item = (JSONObject) array.get(i);
            String key = item.getString("key");
            String value = item.getString("value");
            res.put(key, value);
        }
        return res;
    }

    /**
     * Encodes string list as a JSON object
     *
     * @param data data
     * @return encoded string
     */
    public static String encodeStringList(List data) {
        JSONArray res = new JSONArray();
        for (String elm : data) {
            res.put(elm);
        }
        return res.toString();
    }

    /**
     * Decodes string list from the JSON object.
     *
     * @param data data
     * @return decoded map
     */
    public static List decodeStringList(String data) {
        List res = new ArrayList();
        JSONArray array = new JSONArray(data);
        for (int i = 0; i < array.length(); ++i) {
            String item = (String) array.get(i);
            res.add(item);
        }
        return res;
    }

}