com.yy.androidlib.util.notification.NotificationCenter Maven / Gradle / Ivy

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package com.yy.androidlib.util.notification;

import android.os.Handler;
import android.os.Looper;
import android.util.Log;

import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * IOS NSNotificationCenter for Android
 */
public enum NotificationCenter {
    INSTANCE;

    public static final String TAG = "NotificationCenter";
    private Map, Notification> notificationMap;
    private Handler handler;
    private Map allObserver;

    NotificationCenter() {
        notificationMap = new ConcurrentHashMap<>();
        handler = new Handler(Looper.getMainLooper());
        allObserver = new ConcurrentHashMap<>();
    }

    public synchronized void addObserver(final Object observer) {
        allObserver.put(observer, true);
        for (Class i : observer.getClass().getInterfaces()) {
            Notification notification = notificationMap.get(i);
            if (notification != null) {
                notification.getObservers().put(observer, true);
            }
        }
    }

    public synchronized void removeObserver(final Object observer) {
        allObserver.remove(observer);
        for (Class i : observer.getClass().getInterfaces()) {
            Notification notification = notificationMap.get(i);
            if (notification != null) {
                notification.getObservers().remove(observer);
            }
        }
    }

    private  Notification getNotification(Class callback) {
        Notification notification = notificationMap.get(callback);
        if (notification == null) {
            notification = addNotification(callback);
        }
        return notification;
    }

    private synchronized   Notification addNotification(Class callback) {
        Notification notification = notificationMap.get(callback);
        if (notification == null) {
            notification = new Notification<>(callback, handler);
            notificationMap.put(callback, notification);
        }

        //addobserver
        for (Object observer : allObserver.keySet()) {
            if (callback.isInstance(observer)) {
                notification.getObservers().put(observer, true);
            }
        }
        return notification;
    }

    public  T getObserver(Class callback) {
        return getNotification(callback).getObserver();
    }

    @Deprecated
    public void addCallbacks(Class callbackParent) {
        // do nothing
    }
}