diffusion/src/node_modules/features/topics/fetch-result.js

Diffusion JavaScript client

var _implements = require('util/interface')._implements;
var DataTypes = require('data/datatypes');

var TopicResult = require('features/topics/topic-result');

var api = require('../../../topics/fetch-request');
var TopicType = require('../../../topics/topic-type');

var TimeSeriesEventDataType = require('timeseries/time-series-event-datatype');


var TIME_SERIES_DATA_TYPE = TimeSeriesEventDataType.create({
    name: function() { return "event data type"; },
    readValue: function(buffer) { return buffer; },
    toBytes: function(val) { return val; }
});

var FetchResultImpl = _implements(
    api.FetchResult,
    function FetchResultImpl(dataType, result) {

        var resultList = result.results.map(function(topicResult) {
            var value;
            if (topicResult.value !== undefined) {
                if (topicResult.type === TopicType.TIME_SERIES) {
                    value = TIME_SERIES_DATA_TYPE.readAs(
                        TIME_SERIES_DATA_TYPE.valueClass,
                        topicResult.value);
                }
                else {
                    var topicDataType = DataTypes.get(topicResult.type);
                    value = topicDataType.readAs(dataType.valueClass, topicResult.value);
                }
            }

            return new TopicResult(
                topicResult.path,
                topicResult.type,
                value,
                result.properties.length===0 ? {} :
                    result.properties[topicResult.propertiesIndex]
            );
        });


        this.results = function() {
            return resultList;
        };

        this.hasMore = function() {
            return result.hasMore;
        };
    }
);

module.exports = FetchResultImpl;
module.exports.TIME_SERIES_DATA_TYPE = TIME_SERIES_DATA_TYPE;