SettingsStorage.java

package org.aplikator.client.local;

import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

import com.google.gwt.core.client.GWT;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;
import com.google.gwt.storage.client.Storage;

/**
 *
 */
public abstract class SettingsStorage {
    public static final String ACTIVE_SORT = "_activeSort";
    public static final String ACTIVE_FILTER = "_activeFilter";
    public static final String TABLE_MODE = "_tableMode";
    private static final int FOREVER = 2000000000;
    private static final String COOKIE_NAME = "AplikatorViewSettings-" + GWT.getModuleName();
    ;
    private static Logger LOG = Logger.getLogger(SettingsStorage.class.getName());
    private static Storage storage = Storage.getLocalStorageIfSupported();

    private static Map<String, String> map = toMap(storage != null ? storage.getItem(COOKIE_NAME) : null);

    public static void storeSetting(String key, String value) {
        map.put(key, value);
        try {
            String cookie = toJson(map);
            if (storage != null) {
                storage.setItem(COOKIE_NAME, cookie);
            }
        } catch (Throwable t) {
            LOG.warning("Error storing settings:" + t);
        }
    }

    public static String getSetting(String key) {
        return map.get(key);
    }

    private static String toJson(Map<String, String> map) {
        String json = "";
        if (map != null && !map.isEmpty()) {
            JSONObject jsonObj = new JSONObject();
            for (Map.Entry<String, String> entry : map.entrySet()) {
                jsonObj.put(entry.getKey(), new JSONString(entry.getValue()));
            }
            json = jsonObj.toString();
        }
        return json;
    }

    private static Map<String, String> toMap(String jsonStr) {
        Map<String, String> map = new HashMap<String, String>();
        try {

            JSONValue parsed = JSONParser.parseStrict(jsonStr);
            JSONObject jsonObj = parsed.isObject();
            if (jsonObj != null) {
                for (String key : jsonObj.keySet()) {
                    map.put(key, jsonObj.get(key).isString().stringValue());
                }
            }
        } catch (Throwable t) {
            LOG.warning("Error loading settings:" + t);
        }

        return map;
    }
}