service.js

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 * Use in source and binary forms, redistribution in binary form only, with
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 *    materials provided with the distribution.
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 * 2. Neither the name of Nordic Semiconductor ASA nor the names of its
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 *    software without specific prior written permission.
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 * 3. This software, with or without modification, must only be used with a Nordic
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'use strict';

let i = 1;

function _assertValidType(type) {
    if (type !== 'primary' && type !== 'secondary') {
        throw new Error(`Type can only be 'primary' or 'secondary', not '${type}'.`);
    }
}

/**
 * Class that represents a GATT service.
 */
class Service {
    /**
     * Create a service in the Bluetooth `Device's` GATT attribute table.
     *
     * @constructor
     * @param {string} deviceInstanceId The unique ID of the Bluetooth device to add `Service` to.
     * @param {string} uuid A 128-bit or 16-bit unique identifier for this service.
     * @param {string} type The server service type. 'primary' or `secondary`.
     */
    constructor(deviceInstanceId, uuid, type) {
        // increment global so `serviceInstanceId` is unique for each created service.
        i += 1;

        this._instanceId = `${deviceInstanceId}.${i}`;
        this._deviceInstanceId = deviceInstanceId;
        this.uuid = uuid;

        if (this.uuid && !(this.uuid.length === 4 || this.uuid.length === 32)) {
            throw new Error('uuid must be 128-bit or 16-bit.');
        }

        if (type !== undefined) {
            _assertValidType(type);
            this._type = type;
        } else {
            this._type = null;
        }

        this.startHandle = null;
        this.endHandle = null;
    }

    /**
     * Get the instanceId of this service (since uuid is not enough to differentiate services).
     * @returns {string} Unique ID of this service.
     */
    get instanceId() {
        return this._instanceId;
    }

    /**
     * Get the Id of the Bluetooth device that this service belongs to.
     * 'local.server': local/adapter, non-'local.server': remote peripheral.
     * @returns {string} The unique Id of the Bluetooth device that this service belongs to.
     */
    get deviceInstanceId() {
        return this._deviceInstanceId;
    }

    /**
     * Method that sets the `type` of this service.
     *
     * @param {string} type The type of this service. 'primary' or `secondary`.
     * @returns {void}
     */
    set type(type) {
        _assertValidType(type);
        this._type = type;
    }

    /**
     * Get the type of this service. 'primary' or `secondary`.
     * @returns {string} type The type of this service.
     */
    get type() {
        return this._type;
    }
}

module.exports = Service;