79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
const BaseDataview = require('../base');
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const TYPE = 'histogram';
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module.exports = class BaseHistogram extends BaseDataview {
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constructor (query, options, queries) {
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super();
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if (typeof options.column !== 'string') {
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throw new Error('Histogram expects `column` in widget options');
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}
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this.query = query;
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this.queries = queries;
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this.column = options.column;
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this.bins = options.bins;
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this._columnType = null;
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}
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sql (psql, override, callback) {
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if (!callback) {
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callback = override;
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override = {};
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}
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if (this._columnType === null) {
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this.getColumnType(psql, this.column, this.queries.no_filters, (err, type) => {
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// assume numeric, will fail later
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this._columnType = 'numeric';
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if (!err && !!type) {
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this._columnType = Object.keys(type).find(function (key) {
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return type[key];
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});
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}
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this.sql(psql, override, callback);
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}, true); // use read-only transaction
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return null;
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}
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return this._buildQuery(psql, override, callback);
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}
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format (result, override) {
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const histogram = this._getSummary(result, override);
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histogram.bins = this._getBuckets(result);
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return histogram;
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}
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getType () {
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return TYPE;
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}
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toString () {
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return JSON.stringify({
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_type: TYPE,
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_column: this.column,
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_query: this.query
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});
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}
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_getBinStart (override) {
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if (override.hasOwnProperty('start') && override.hasOwnProperty('end')) {
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return Math.min(override.start, override.end);
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}
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return override.start || 0;
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}
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_getBinEnd (override = {}) {
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if (override.hasOwnProperty('start') && override.hasOwnProperty('end')) {
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return Math.max(override.start, override.end);
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}
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return override.end || 0;
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}
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_getBinsCount (override = {}) {
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return override.bins || 0;
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}
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}; |