smartstream/dist/index.js

"use strict";
const plugins = require("./smartstream.plugins");
/**
 * class Smartstream handles
 */
class Smartstream {
    constructor(streamArrayArg) {
        this.streamArray = [];
        this.errorFunction = null;
        this.streamStartFunction = null;
        this.customEventObjectArray = [];
        this.streamArray = streamArrayArg;
    }
    /**
     * attach an error handler to the stream to prevent throwing
     */
    onError(errorFunctionArg) {
        this.errorFunction = errorFunctionArg;
    }
    /**
     * make something with the stream itself
     */
    onStreamStart() {
    }
    /**
     * run the stream
     * @returns Promise
     */
    run() {
        let done = plugins.q.defer();
        // clone Array
        let streamExecutionArray = [];
        for (let streamItem of this.streamArray) {
            streamExecutionArray.push(streamItem);
        }
        // combine the stream
        let finalStream = null;
        let firstIteration = true;
        for (let stream of streamExecutionArray) {
            if (firstIteration === true) {
                finalStream = stream;
            }
            if (this.errorFunction !== null) {
                stream.on('error', this.errorFunction);
            }
            for (let customEventObject of this.customEventObjectArray) {
                stream.on(customEventObject.eventName, customEventObject.eventFunction);
            }
            if (!firstIteration) {
                finalStream = finalStream.pipe(stream);
            }
            firstIteration = false;
        }
        finalStream.on('end', function () {
            done.resolve();
        });
        finalStream.on('close', function () {
            done.resolve();
        });
        finalStream.on('finish', function () {
            done.resolve();
        });
        return done.promise;
    }
}
exports.Smartstream = Smartstream;
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