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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
package org.libreoffice.impressremote.communication;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.support.v4.content.LocalBroadcastManager;
import org.libreoffice.impressremote.util.Intents;
import org.libreoffice.impressremote.communication.Server.Protocol;
class BluetoothServersFinder extends BroadcastReceiver implements ServersFinder, Runnable {
private static final int SEARCH_DELAY_IN_MILLISECONDS = 1000 * 10;
private final Context mContext;
private final Map<String, Server> mServers;
public BluetoothServersFinder(Context aContext) {
mContext = aContext;
mServers = new HashMap<String, Server>();
}
@Override
public void startSearch() {
if (!isBluetoothAvailable()) {
return;
}
if (BluetoothAdapter.getDefaultAdapter().isDiscovering()) {
return;
}
setUpSearchResultsReceiver();
BluetoothAdapter.getDefaultAdapter().startDiscovery();
}
private boolean isBluetoothAvailable() {
return BluetoothAdapter.getDefaultAdapter() != null;
}
private void setUpSearchResultsReceiver() {
IntentFilter aSearchResultsFilter = new IntentFilter(
BluetoothDevice.ACTION_FOUND);
aSearchResultsFilter
.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
mContext.registerReceiver(this, aSearchResultsFilter);
}
@Override
public void onReceive(Context aContext, Intent aIntent) {
if (BluetoothDevice.ACTION_FOUND.equals(aIntent.getAction())) {
BluetoothDevice aBluetoothDevice = aIntent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
addServer(buildServer(aBluetoothDevice));
callUpdatingServersList();
return;
}
if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED
.equals(aIntent.getAction())) {
startDiscoveryDelayed();
}
}
private void addServer(Server aServer) {
mServers.put(aServer.getAddress(), aServer);
}
private Server buildServer(BluetoothDevice aBluetoothDevice) {
String aServerAddress = aBluetoothDevice.getAddress();
String aServerName = aBluetoothDevice.getName();
return new Server(Protocol.BLUETOOTH, aServerAddress, aServerName);
}
private void callUpdatingServersList() {
Intent aIntent = Intents.buildServersListChangedIntent();
LocalBroadcastManager.getInstance(mContext).sendBroadcast(aIntent);
}
private void startDiscoveryDelayed() {
// Start discovery again after a small delay.
// but check whether device is on in case the user manually
// disabled bluetooth
if (!BluetoothAdapter.getDefaultAdapter().isEnabled()) {
return;
}
Handler aHandler = new Handler();
aHandler.postDelayed(this, SEARCH_DELAY_IN_MILLISECONDS);
}
@Override
public void run() {
BluetoothAdapter.getDefaultAdapter().startDiscovery();
}
@Override
public void stopSearch() {
if (!isBluetoothAvailable()) {
return;
}
tearDownSearchResultsReceiver();
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
}
private void tearDownSearchResultsReceiver() {
try {
mContext.unregisterReceiver(this);
} catch (IllegalArgumentException e) {
// Receiver not registered.
// Fixed in Honeycomb: Android’s issue #6191.
}
}
@Override
public List<Server> getServers() {
return new ArrayList<Server>(mServers.values());
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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