Method _createSource

src/data/helper/sourceManager.ts:195–275

()

    }

    private _createSource(): void {
        this._setLocalSource([], []);

        const sourceHost = this._sourceHost;

        const upSourceMgrList = this._getUpstreamSourceManagers();
        const hasUpstream = !!upSourceMgrList.length;
        let resultSourceList: Source[];
        let upstreamSignList: string[];

        if (isSeries(sourceHost)) {
            const seriesModel = sourceHost as SeriesEncodableModel;
            let data;
            let sourceFormat: SourceFormat;
            let upSource: Source;

            // Has upstream dataset
            if (hasUpstream) {
                const upSourceMgr = upSourceMgrList[0];
                upSourceMgr.prepareSource();
                upSource = upSourceMgr.getSource();
                data = upSource.data;
                sourceFormat = upSource.sourceFormat;
                upstreamSignList = [upSourceMgr._getVersionSign()];
            }
            // Series data is from own.
            else {
                data = seriesModel.get('data', true) as OptionSourceData;
                sourceFormat = isTypedArray(data)
                    ? SOURCE_FORMAT_TYPED_ARRAY : SOURCE_FORMAT_ORIGINAL;
                upstreamSignList = [];
            }

            // See [REQUIREMENT_MEMO], merge settings on series and parent dataset if it is root.
            const newMetaRawOption = this._getSourceMetaRawOption() || {} as SourceMetaRawOption;
            const upMetaRawOption = upSource && upSource.metaRawOption || {} as SourceMetaRawOption;
            const seriesLayoutBy = retrieve2(newMetaRawOption.seriesLayoutBy, upMetaRawOption.seriesLayoutBy) || null;
            const sourceHeader = retrieve2(newMetaRawOption.sourceHeader, upMetaRawOption.sourceHeader);
            // Note here we should not use `upSource.dimensionsDefine`. Consider the case:
            // `upSource.dimensionsDefine` is detected by `seriesLayoutBy: 'column'`,
            // but series need `seriesLayoutBy: 'row'`.
            const dimensions = retrieve2(newMetaRawOption.dimensions, upMetaRawOption.dimensions);

            // We share source with dataset as much as possible
            // to avoid extra memory cost of high dimensional data.
            const needsCreateSource = seriesLayoutBy !== upMetaRawOption.seriesLayoutBy
                || !!sourceHeader !== !!upMetaRawOption.sourceHeader
                || dimensions;
            resultSourceList = needsCreateSource ? [createSource(
                data,
                { seriesLayoutBy, sourceHeader, dimensions },
                sourceFormat
            )] : [];
        }
        else {
            const datasetModel = sourceHost as DatasetModel;

            // Has upstream dataset.