@foxglove/rosbag2/dist/MessageIterator.js

ROS 2 (Robot Operating System) bag reader and writer abstract implementation

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.MessageIterator = void 0;
/**
 * MessageIterator is a helper class to convert raw table rows into Message instances as an
 * asynchronous iterator.
 */
class MessageIterator {
    constructor(rowIterators, decoder) {
        this.rowIterators = rowIterators;
        this.decoder = decoder;
    }
    [Symbol.asyncIterator]() {
        return this;
    }
    async next() {
        while (this.rowIterators.length > 0) {
            const front = this.rowIterators[0];
            const res = await front.next();
            if (res.done === true) {
                this.rowIterators.shift();
                continue;
            }
            const rawMessage = res.value;
            const { topic, timestamp, data } = rawMessage;
            if (this.decoder == undefined) {
                return { value: { topic, timestamp, data, value: undefined }, done: false };
            }
            const value = { topic, timestamp, data, value: this.decoder(rawMessage) };
            return { value, done: false };
        }
        return { value: undefined, done: true };
    }
}
exports.MessageIterator = MessageIterator;
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