package com.blitterhead.ampwifi.util;

import android.app.Application;
import android.arch.lifecycle.AndroidViewModel;
import android.databinding.Observable;
import android.databinding.PropertyChangeRegistry;
import android.support.annotation.NonNull;

/**
 * Created by Mike on 15-Jan-18.
 */

public class BaseObservableAndroidViewModel extends AndroidViewModel implements Observable {
	protected BaseObservableAndroidViewModel(@NonNull Application application) {
		super(application);
	}

	private transient PropertyChangeRegistry mCallbacks;

	public synchronized void addOnPropertyChangedCallback(Observable.OnPropertyChangedCallback listener) {
		if (this.mCallbacks == null) {
			this.mCallbacks = new PropertyChangeRegistry();
		}

		this.mCallbacks.add(listener);
	}

	public synchronized void removeOnPropertyChangedCallback(Observable.OnPropertyChangedCallback listener) {
		if (this.mCallbacks != null) {
			this.mCallbacks.remove(listener);
		}
	}

	public synchronized void notifyChange() {
		if (this.mCallbacks != null) {
			this.mCallbacks.notifyCallbacks(this, 0, null);
		}
	}

	protected void notifyPropertyChanged(int fieldId) {
		if (this.mCallbacks != null) {
			this.mCallbacks.notifyCallbacks(this, fieldId, null);
		}
	}
}