Method parseAndCollect

src/data/OrdinalMeta.ts:98–142

* @return The ordinal. If not found, return NaN.

(category: OrdinalRawValue | OrdinalNumber)

     * @return The ordinal. If not found, return NaN.
     */
    parseAndCollect(category: OrdinalRawValue | OrdinalNumber): OrdinalNumber {
        let index;
        const needCollect = this._needCollect;

        // The value of category dim can be the index of the given category set.
        // This feature is only supported when !needCollect, because we should
        // consider a common case: a value is 2017, which is a number but is
        // expected to be tread as a category. This case usually happen in dataset,
        // where it happent to be no need of the index feature.
        if (!isString(category) && !needCollect) {
            return category;
        }

        // Optimize for the scenario:
        // category is ['2012-01-01', '2012-01-02', ...], where the input
        // data has been ensured not duplicate and is large data.
        // Notice, if a dataset dimension provide categroies, usually echarts
        // should remove duplication except user tell echarts dont do that
        // (set axis.deduplication = false), because echarts do not know whether
        // the values in the category dimension has duplication (consider the
        // parallel-aqi example)
        if (needCollect && !this._deduplication) {
            index = this.categories.length;
            this.categories[index] = category;
            this._onCollect && this._onCollect(category, index);
            return index;
        }

        const map = this._getOrCreateMap();
        index = map.get(category);

        if (index == null) {
            if (needCollect) {
                index = this.categories.length;
                this.categories[index] = category;
                map.set(category, index);
                this._onCollect && this._onCollect(category, index);
            }
            else {
                index = NaN;
            }
        }

        return index;
    }

    // Consider big data, do not create map until needed.
    private _getOrCreateMap(): HashMap<OrdinalNumber> {