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package com.wireguard.android.activity;
import android.app.Activity;
import android.databinding.CallbackRegistry;
import android.databinding.CallbackRegistry.NotifierCallback;
import android.os.Bundle;
import com.wireguard.android.Application;
import com.wireguard.android.model.Tunnel;
import com.wireguard.android.model.TunnelManager;
import java.util.Objects;
/**
* Base class for activities that need to remember the currently-selected tunnel.
*/
public abstract class BaseActivity extends Activity {
private static final String TAG = BaseActivity.class.getSimpleName();
private final SelectionChangeRegistry selectionChangeRegistry = new SelectionChangeRegistry();
private Tunnel selectedTunnel;
public void addOnSelectedTunnelChangedListener(
final OnSelectedTunnelChangedListener listener) {
selectionChangeRegistry.add(listener);
}
public Tunnel getSelectedTunnel() {
return selectedTunnel;
}
@Override
protected void onCreate(final Bundle savedInstanceState) {
// Restore the saved tunnel if there is one; otherwise grab it from the arguments.
String savedTunnelName = null;
if (savedInstanceState != null)
savedTunnelName = savedInstanceState.getString(TunnelManager.KEY_SELECTED_TUNNEL);
else if (getIntent() != null)
savedTunnelName = getIntent().getStringExtra(TunnelManager.KEY_SELECTED_TUNNEL);
if (savedTunnelName != null) {
final TunnelManager manager = Application.getComponent().getTunnelManager();
selectedTunnel = manager.getTunnels().get(savedTunnelName);
}
// The selected tunnel must be set before the superclass method recreates fragments.
super.onCreate(savedInstanceState);
}
@Override
protected void onSaveInstanceState(final Bundle outState) {
if (selectedTunnel != null)
outState.putString(TunnelManager.KEY_SELECTED_TUNNEL, selectedTunnel.getName());
super.onSaveInstanceState(outState);
}
protected abstract Tunnel onSelectedTunnelChanged(Tunnel oldTunnel, Tunnel newTunnel);
public void removeOnSelectedTunnelChangedListener(
final OnSelectedTunnelChangedListener listener) {
selectionChangeRegistry.remove(listener);
}
public void setSelectedTunnel(final Tunnel tunnel) {
final Tunnel oldTunnel = selectedTunnel;
if (Objects.equals(oldTunnel, tunnel))
return;
// Give the activity a chance to override the tunnel change.
selectedTunnel = onSelectedTunnelChanged(oldTunnel, tunnel);
if (Objects.equals(oldTunnel, selectedTunnel))
return;
selectionChangeRegistry.notifyCallbacks(oldTunnel, 0, selectedTunnel);
}
public interface OnSelectedTunnelChangedListener {
void onSelectedTunnelChanged(Tunnel oldTunnel, Tunnel newTunnel);
}
private static final class SelectionChangeNotifier
extends NotifierCallback<OnSelectedTunnelChangedListener, Tunnel, Tunnel> {
@Override
public void onNotifyCallback(final OnSelectedTunnelChangedListener listener,
final Tunnel oldTunnel, final int ignored,
final Tunnel newTunnel) {
listener.onSelectedTunnelChanged(oldTunnel, newTunnel);
}
}
private static final class SelectionChangeRegistry
extends CallbackRegistry<OnSelectedTunnelChangedListener, Tunnel, Tunnel> {
private SelectionChangeRegistry() {
super(new SelectionChangeNotifier());
}
}
}
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