/*
 * Copyright 2017 mk
 *
 * 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 pl.mk5.gdx.fireapp.database;

import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.ObjectMap;

public class DataListenersManager<T> {
    private final ObjectMap<String, Array<T>> listeners;

    public DataListenersManager() {
        listeners = new ObjectMap<>();
    }

    public void addNewListener(String databasePath, T listener) {
        synchronized (listeners) {
            if (!listeners.containsKey(databasePath))
                listeners.put(databasePath, new Array<T>());
            listeners.get(databasePath).add(listener);
        }
    }

    public void removeListenersForPath(String databasePath) {
        synchronized (listeners) {
            if (listeners.containsKey(databasePath))
                listeners.get(databasePath).clear();
        }
    }

    public boolean hasListeners(String databasePath) {
        return listeners.containsKey(databasePath);
    }

    public Array<T> getListeners(String databasePath) {
        if (!listeners.containsKey(databasePath)) return new Array<>();
        return new Array<>(listeners.get(databasePath));
    }
}
