Method getSource

src/data/helper/sourceManager.ts:356–366

* @param sourceIndex By default 0, means "main source". * In most cases there is only one source.

(sourceIndex?: number)

     *                    In most cases there is only one source.
     */
    getSource(sourceIndex?: number): Source {
        sourceIndex = sourceIndex || 0;
        const source = this._sourceList[sourceIndex];
        if (!source) {
            // Series may share source instance with dataset.
            const upSourceMgrList = this._getUpstreamSourceManagers();
            return upSourceMgrList[0]
                && upSourceMgrList[0].getSource(sourceIndex);
        }
        return source;
    }

    /**
     *