Method collectOrdinalMeta

src/data/DataStore.ts:277–309

(
        dimIdx: number,
        ordinalMeta: OrdinalMeta
    )

    }

    collectOrdinalMeta(
        dimIdx: number,
        ordinalMeta: OrdinalMeta
    ): void {
        const chunk = this._chunks[dimIdx];
        const dim = this._dimensions[dimIdx];
        const rawExtents = this._rawExtent;

        const offset = dim.ordinalOffset || 0;
        const len = chunk.length;

        if (offset === 0) {
            // We need to reset the rawExtent if collect is from start.
            // Because this dimension may be guessed as number and calcuating a wrong extent.
            rawExtents[dimIdx] = initExtentForUnion();
        }

        const dimRawExtent = rawExtents[dimIdx];

        // Parse from previous data offset. len may be changed after appendData
        for (let i = offset; i < len; i++) {
            // See also CATEGORY_AXIS_MODEL_DATA_IS_EMPTY_ARRAY.
            const val = (chunk as any)[i] = ordinalMeta.parseAndCollect(chunk[i]);
            if (!isNaN(val)) {
                dimRawExtent[0] = Math.min(val, dimRawExtent[0]);
                dimRawExtent[1] = Math.max(val, dimRawExtent[1]);
            }
        }

        dim.ordinalMeta = ordinalMeta;
        dim.ordinalOffset = len;
        dim.type = 'ordinal';   // Force to be ordinal
    }

    getOrdinalMeta(dimIdx: number): OrdinalMeta {
        const dimInfo = this._dimensions[dimIdx];