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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* Javascript for DeviceCollection, served from
* chrome://bluetooth-internals/.
*/
import {assert} from 'chrome://resources/js/assert.js';
/**
* Enum of connection status for a device.
* @enum {number}
*/
export const ConnectionStatus = {
DISCONNECTED: 0,
CONNECTING: 1,
CONNECTED: 2,
};
/**
* Collection of devices. Extends EventTarget to notify observers when the
* collection changes.
*/
export class DeviceCollection extends EventTarget {
/**
* @param {!Array<!DeviceInfo>} array The starting
* collection of devices.
*/
constructor(array) {
super();
/** @private {!Array<!DeviceInfo>} */
this.array_ = array;
// Keep track of MAC addresses which were previously found via scan, but
// are no longer being advertised or nearby. Used to inform isRemoved().
/** @private {!Object<string, boolean>} */
this.removedDevices_ = {};
}
/** @return {number} */
get length() {
return this.array_.length;
}
/**
* @param {number}
* @return {DeviceInfo}
*/
item(index) {
return (index < 0 || index > this.length) ? undefined : this.array_[index];
}
/**
* Finds the Device in the collection with the matching address.
* @param {string} address
* @return {number} The index where the device was found.
*/
getByAddress(address) {
for (let i = 0; i < this.length; i++) {
const device = this.array_[i];
if (address === device.address) {
return i;
}
}
return -1;
}
/**
* Adds or updates a Device with new DeviceInfo.
* @param {!DeviceInfo} deviceInfo
*/
addOrUpdate(deviceInfo) {
this.removedDevices_[deviceInfo.address] = false;
const oldDeviceIndex = this.getByAddress(deviceInfo.address);
if (oldDeviceIndex !== -1) {
// Update rssi if it's valid
const oldDeviceInfo = this.array_[oldDeviceIndex];
const rssi = (deviceInfo.rssi && deviceInfo.rssi.value) ||
(oldDeviceInfo.rssi && oldDeviceInfo.rssi.value);
// The rssi property may be null, so it must be re-assigned.
Object.assign(oldDeviceInfo, deviceInfo);
oldDeviceInfo.rssi = {value: rssi};
this.dispatchEvent(new CustomEvent(
'device-update',
{bubbles: true, composed: true, detail: oldDeviceIndex}));
} else {
this.array_.push(deviceInfo);
this.dispatchEvent(new CustomEvent('device-added', {
bubbles: true,
composed: true,
detail: {index: this.length - 1, device: deviceInfo},
}));
}
}
/**
* Marks the Device as removed.
* @param {!DeviceInfo} deviceInfo
*/
remove(deviceInfo) {
const deviceIndex = this.getByAddress(deviceInfo.address);
assert(deviceIndex !== -1, 'Device does not exist.');
this.removedDevices_[deviceInfo.address] = true;
this.dispatchEvent(new CustomEvent(
'device-update', {bubbles: true, composed: true, detail: deviceIndex}));
}
/**
* Return true if device was "removed" -- previously found via scan but
* either no longer advertising or no longer nearby.
* @param {!DeviceInfo} deviceInfo
* @return {boolean}
*/
isRemoved(deviceInfo) {
return !!this.removedDevices_[deviceInfo.address];
}
resetForTest() {
this.array_ = [];
this.removedDevices_ = [];
this.dispatchEvent(new CustomEvent(
'devices-reset-for-test', {bubbles: true, composed: true}));
}
}
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