73 lines
2.4 KiB
JavaScript
73 lines
2.4 KiB
JavaScript
const debug = require('debug')('windshaft:dataview:histogram');
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const NumericHistogram = require('./histograms/numeric-histogram');
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const DateHistogram = require('./histograms/date-histogram');
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const DATE_HISTOGRAM = 'DateHistogram';
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const NUMERIC_HISTOGRAM = 'NumericHistogram';
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module.exports = class Histogram {
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constructor (query, options, queries) {
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this.query = query;
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this.options = options || {};
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this.queries = queries;
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this.histogramImplementation = this._getHistogramImplementation();
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}
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_getHistogramImplementation (override) {
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let implementation = null;
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switch (this._getHistogramSubtype(override)) {
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case DATE_HISTOGRAM:
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debug('Delegating to DateHistogram with options: %j and overriding: %j', this.options, override);
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implementation = new DateHistogram(this.query, this.options, this.queries);
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break;
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case NUMERIC_HISTOGRAM:
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debug('Delegating to NumericHistogram with options: %j and overriding: %j', this.options, override);
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implementation = new NumericHistogram(this.query, this.options, this.queries);
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break;
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default:
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throw new Error('Unsupported Histogram type');
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}
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return implementation;
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}
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_getHistogramSubtype (override) {
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if(this._isDateHistogram(override)) {
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return DATE_HISTOGRAM;
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}
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return NUMERIC_HISTOGRAM;
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}
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_isDateHistogram (override = {}) {
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return (this.options.hasOwnProperty('aggregation') || override.hasOwnProperty('aggregation'));
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}
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getResult (psql, override, callback) {
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this.histogramImplementation = this._getHistogramImplementation(override);
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this.histogramImplementation.getResult(psql, override, callback);
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}
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// In order to keep previous behaviour with overviews,
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// we have to expose the following methods to bypass
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// the concrete overview implementation
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sql (psql, override, callback) {
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this.histogramImplementation.sql(psql, override, callback);
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}
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format (result, override) {
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return this.histogramImplementation.format(result, override);
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}
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getType () {
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return this.histogramImplementation.getType();
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}
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toString () {
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return this.histogramImplementation.toString();
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}
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};
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