command-handler.js

/*
This file is part of Talkie -- text-to-speech browser extension button.
<https://github.com/joelpurra/talkie>

Copyright (c) 2016, 2017 Joel Purra <https://joelpurra.com/>

Talkie is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Talkie is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Talkie.  If not, see <https://www.gnu.org/licenses/>.
*/

import {
    log,
    logError,
} from "../shared/log";

export default class CommandHandler {
    constructor(commandMap) {
        this.commandMap = commandMap;
    }

    handle(command, ...args) {
        log("Start", "commandHandler", command);

        const commandAction = this.commandMap[command];

        if (typeof commandAction !== "function") {
            throw new Error("Bad command action for command: " + command);
        }

        return commandAction(...args)
            .then((result) => {
                log("Done", "commandHandler", command, result);

                return undefined;
            })
            .catch((error) => {
                logError("Error", "commandHandler", command, error);

                throw error;
            });
    }

    handleCommandEvent(command, ...args) {
        log("Start", "handleCommandEvent", command);

        // NOTE: straight mapping from command to action.
        return this.handle(command, ...args)
            .then((result) => {
                log("Done", "handleCommandEvent", command, result);

                return undefined;
            })
            .catch((error) => {
                logError("Error", "handleCommandEvent", command, error);

                throw error;
            });
    }
}