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/*
* Copyright (C) 2011 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.
*/
package com.android.settings.bluetooth;
import android.bluetooth.BluetoothClass;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothUuid;
import android.os.ParcelUuid;
import android.util.Log;
/**
* BluetoothDeviceFilter contains a static method that returns a
* Filter object that returns whether or not the BluetoothDevice
* passed to it matches the specified filter type constant from
* {@link android.bluetooth.BluetoothDevicePicker}.
*/
final class BluetoothDeviceFilter {
private static final String TAG = "BluetoothDeviceFilter";
/** The filter interface to external classes. */
interface Filter {
boolean matches(BluetoothDevice device);
}
/** All filter singleton (referenced directly). */
static final Filter ALL_FILTER = new AllFilter();
/** Bonded devices only filter (referenced directly). */
static final Filter BONDED_DEVICE_FILTER = new BondedDeviceFilter();
/** Unbonded devices only filter (referenced directly). */
static final Filter UNBONDED_DEVICE_FILTER = new UnbondedDeviceFilter();
/** Table of singleton filter objects. */
private static final Filter[] FILTERS = {
ALL_FILTER, // FILTER_TYPE_ALL
new AudioFilter(), // FILTER_TYPE_AUDIO
new TransferFilter(), // FILTER_TYPE_TRANSFER
new PanuFilter(), // FILTER_TYPE_PANU
new NapFilter() // FILTER_TYPE_NAP
};
/** Private constructor. */
private BluetoothDeviceFilter() {
}
/**
* Returns the singleton {@link Filter} object for the specified type,
* or {@link #ALL_FILTER} if the type value is out of range.
*
* @param filterType a constant from BluetoothDevicePicker
* @return a singleton object implementing the {@link Filter} interface.
*/
static Filter getFilter(int filterType) {
if (filterType >= 0 && filterType < FILTERS.length) {
return FILTERS[filterType];
} else {
Log.w(TAG, "Invalid filter type " + filterType + " for device picker");
return ALL_FILTER;
}
}
/** Filter that matches all devices. */
private static final class AllFilter implements Filter {
public boolean matches(BluetoothDevice device) {
return true;
}
}
/** Filter that matches only bonded devices. */
private static final class BondedDeviceFilter implements Filter {
public boolean matches(BluetoothDevice device) {
return device.getBondState() == BluetoothDevice.BOND_BONDED;
}
}
/** Filter that matches only unbonded devices. */
private static final class UnbondedDeviceFilter implements Filter {
public boolean matches(BluetoothDevice device) {
return device.getBondState() != BluetoothDevice.BOND_BONDED;
}
}
/** Parent class of filters based on UUID and/or Bluetooth class. */
private abstract static class ClassUuidFilter implements Filter {
abstract boolean matches(ParcelUuid[] uuids, BluetoothClass btClass);
public boolean matches(BluetoothDevice device) {
return matches(device.getUuids(), device.getBluetoothClass());
}
}
/** Filter that matches devices that support AUDIO profiles. */
private static final class AudioFilter extends ClassUuidFilter {
@Override
boolean matches(ParcelUuid[] uuids, BluetoothClass btClass) {
if (uuids != null) {
if (BluetoothUuid.containsAnyUuid(uuids, A2dpProfile.SINK_UUIDS)) {
return true;
}
if (BluetoothUuid.containsAnyUuid(uuids, HeadsetProfile.UUIDS)) {
return true;
}
} else if (btClass != null) {
if (btClass.doesClassMatch(BluetoothClass.PROFILE_A2DP) ||
btClass.doesClassMatch(BluetoothClass.PROFILE_HEADSET)) {
return true;
}
}
return false;
}
}
/** Filter that matches devices that support Object Transfer. */
private static final class TransferFilter extends ClassUuidFilter {
@Override
boolean matches(ParcelUuid[] uuids, BluetoothClass btClass) {
if (uuids != null) {
if (BluetoothUuid.isUuidPresent(uuids, BluetoothUuid.ObexObjectPush)) {
return true;
}
}
return btClass != null
&& btClass.doesClassMatch(BluetoothClass.PROFILE_OPP);
}
}
/** Filter that matches devices that support PAN User (PANU) profile. */
private static final class PanuFilter extends ClassUuidFilter {
@Override
boolean matches(ParcelUuid[] uuids, BluetoothClass btClass) {
if (uuids != null) {
if (BluetoothUuid.isUuidPresent(uuids, BluetoothUuid.PANU)) {
return true;
}
}
return btClass != null
&& btClass.doesClassMatch(BluetoothClass.PROFILE_PANU);
}
}
/** Filter that matches devices that support NAP profile. */
private static final class NapFilter extends ClassUuidFilter {
@Override
boolean matches(ParcelUuid[] uuids, BluetoothClass btClass) {
if (uuids != null) {
if (BluetoothUuid.isUuidPresent(uuids, BluetoothUuid.NAP)) {
return true;
}
}
return btClass != null
&& btClass.doesClassMatch(BluetoothClass.PROFILE_NAP);
}
}
}
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