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The JWebSwing implementation for Data Tables

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'use strict';

var Readable = require('readable-stream').Readable;

var utils = require('../utils');
utils.inherits(NodejsStreamOutputAdapter, Readable);

/**
 * A nodejs stream using a worker as source.
 * @see the SourceWrapper in http://nodejs.org/api/stream.html
 * @constructor
 * @param {StreamHelper} helper the helper wrapping the worker
 * @param {Object} options the nodejs stream options
 * @param {Function} updateCb the update callback.
 */
function NodejsStreamOutputAdapter(helper, options, updateCb) {
    Readable.call(this, options);
    this._helper = helper;

    var self = this;
    helper.on("data", function (data, meta) {
        if (!self.push(data)) {
            self._helper.pause();
        }
        if (updateCb) {
            updateCb(meta);
        }
    })
        .on("error", function (e) {
            self.emit('error', e);
        })
        .on("end", function () {
            self.push(null);
        });
}


NodejsStreamOutputAdapter.prototype._read = function () {
    this._helper.resume();
};

module.exports = NodejsStreamOutputAdapter;