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    computeLayout.js configDiff.js dashboardMirror.js dashboardScaffold.js data.js dummyVis.js layout.js links.js main.js map.js processActions.js query.js timeline.js udc.js wire.js

  • query.js

  • ¶

    A module that queries Universal Data Cube data.

    Curran Kelleher 4/9/2014

    define([], function () {
  return function (dashboard) {
    var model = new Backbone.Model();
    model.wire(['source', 'dataSet', 'query'], function (source, dataSet, query) {
  • ¶

    Get the data component from the dashboard configuration, which is responsible for loading data sources.

          dashboard.getComponent('data', function (dataComponent) {
  • ¶

    Extract the UDC context from the data component.

            var udc = dataComponent.udc;
  • ¶

    Wait for the data set to load.

            udc.waitFor(source, dataSet, function () {
  • ¶

    Query the data cube for the X dimension domain.

              /* TODO refactor the API so (source, dataSet) are not needed */
          var xDomainCodes = udc.getDomain(source, dataSet, query.x),
              xDomainCodeList = udc.getCodeList(source, dataSet, query.x),

              /* TODO generalize handling of X dimensions, special case Time */
  • ¶

    Parse X dimension domain values into JS Date objects.

                  xDomainDates = xDomainCodes.map( function (yearStr) {
                return new Date(yearStr, 0);
              }),
  • ¶

    Use the slice option as the basis for the current cell.

                  cell = _.clone(query.slices);

          model.set('result', xDomainCodes.map(function (code, i) {
  • ¶

    Set the X dimension value for the current cell to the X domain value.

                cell[query.x] = {
              code: code,
              codeList: xDomainCodeList
            };
  • ¶

    Map X domain objects to data element objects with

                return {
  • ¶
    • x The date corresponding to the X domain value.
                  x: xDomainDates[i],
  • ¶
    • y The measure value from the data cube for the current cell and the configured Y measure.
                  y: udc.getValue(source, dataSet, cell, query.y)
            };
          }));
        });
      });
    });
    return model;
  };
});