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package org.solovyev.android.network;

/**
 * User: serso
 * Date: 7/26/12
 * Time: 5:15 PM
 */


/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * 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.
 */

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.util.Log;
import org.solovyev.common.listeners.JListeners;
import org.solovyev.common.listeners.Listeners;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public final class NetworkStateServiceImpl implements NetworkStateService {

	private static final boolean DEBUG = false;

	@Nullable
	private Context context;

	@Nonnull
	private final JListeners listeners = Listeners.newHardRefListeners();

	@Nonnull
	private NetworkData networkData;

	@Nonnull
	private BroadcastReceiver receiver;

	private class ConnectivityBroadcastReceiver extends BroadcastReceiver {
		@Override
		public void onReceive(@Nonnull Context context, @Nonnull Intent intent) {
			final String action = intent.getAction();

			if (!action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
				return;
			}

			final NetworkData localNetworkData = NetworkDataImpl.fromIntent(intent);

			networkData = localNetworkData;

			if (DEBUG) {
				Log.d(TAG, "onReceive(): " + localNetworkData);
			}

			// notify listeners
			for (NetworkStateListener localListener : listeners.getListeners()) {
				localListener.onNetworkEvent(localNetworkData);
			}
		}
	}

	public NetworkStateServiceImpl() {
		networkData = NetworkDataImpl.newUnknownNetworkData();
		receiver = new ConnectivityBroadcastReceiver();
	}

	@Override
	public synchronized void startListening(@Nonnull Context context) {
		this.context = context.getApplicationContext();

		final IntentFilter filter = new IntentFilter();
		filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
		context.registerReceiver(receiver, filter);
	}

	@Override
	public boolean addListener(@Nonnull NetworkStateListener listener) {
		return listeners.addListener(listener);
	}

	@Override
	public boolean removeListener(@Nonnull NetworkStateListener listener) {
		return listeners.removeListener(listener);
	}

	@Override
	public synchronized void stopListening() {
		if (context != null) {
			context.unregisterReceiver(receiver);
		}
		context = null;
		networkData = NetworkDataImpl.newUnknownNetworkData();
	}

	@Override
	@Nonnull
	public NetworkData getNetworkData() {
		return networkData;
	}
}