annis.gui.components.SettingsStorage.java Source code

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Here is the source code for annis.gui.components.SettingsStorage.java

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/*
 * Copyright 2015 Corpuslinguistic working group Humboldt University Berlin.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package annis.gui.components;

import annis.libgui.Helper;
import com.vaadin.annotations.JavaScript;
import com.vaadin.server.AbstractJavaScriptExtension;
import com.vaadin.ui.JavaScriptFunction;
import com.vaadin.ui.UI;
import elemental.json.JsonArray;
import elemental.json.JsonObject;
import elemental.json.JsonType;
import elemental.json.JsonValue;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 *
 * @author Thomas Krause <krauseto@hu-berlin.de>
 */
@JavaScript({ "js.cookie-2.0.3.min.js", "settingsstorage.js" })
public class SettingsStorage extends AbstractJavaScriptExtension {
    private final ConcurrentMap<String, String> storage = new ConcurrentHashMap<>();
    private final List<LoadedListener> loadedListeners = new LinkedList<>();

    public SettingsStorage(UI ui) {
        if (ui != null) {
            extend(ui);
        }

        addFunction("loadFromClient", new JavaScriptFunction() {
            @Override
            public void call(JsonArray args) {
                JsonObject values = args.get(0);
                for (String key : values.keys()) {
                    JsonValue v = values.get(key);
                    if (v.getType() == JsonType.STRING) {
                        storage.put(key, v.asString());
                    } else if (v.getType() == JsonType.OBJECT) {
                        storage.put(key, v.toJson());
                    }
                }

                for (LoadedListener l : loadedListeners) {
                    l.onSettingsLoaded(SettingsStorage.this);
                }

            }
        });

    }

    public void addedLoadedListener(LoadedListener listener) {
        loadedListeners.add(listener);
    }

    public void set(String name, String value, int lifetimeInDays) {
        storage.put(name, value);
        callFunction("set", name, value, Helper.getContext(), lifetimeInDays);
    }

    public String get(String name) {
        return storage.get(name);
    }

    /**
     * Callback for the event that the settings have been loaded
     * from the client.
     */
    public static interface LoadedListener {
        /**
         * Called when the settings have been loaded from the client.
         * Will be only called once.
         * @param settings 
         */
        public void onSettingsLoaded(SettingsStorage settings);
    }
}