Class DefaultDataProvider

src/data/helper/dataProvider.ts:84–294

 * If typed array used, chunk size must be fixed.
 */
export class DefaultDataProvider implements DataProvider {

    private _source: Source;

    private _data: OptionSourceData;

    private _offset: number;

    private _dimSize: number;

    pure: boolean;

    persistent: boolean;

    static protoInitialize = (function () {
        // PENDING: To avoid potential incompat (e.g., prototype
        // is visited somewhere), still init them on prototype.
        const proto = DefaultDataProvider.prototype;
        proto.pure = false;
        proto.persistent = true;
    })();


    constructor(sourceParam: Source | OptionSourceData, dimSize?: number) {
        // let source: Source;
        const source: Source = !isSourceInstance(sourceParam)
            ? createSourceFromSeriesDataOption(sourceParam as OptionSourceData)
            : sourceParam as Source;

        // declare source is Source;
        this._source = source;
        const data = this._data = source.data;
        const sourceFormat = source.sourceFormat;
        const seriesLayoutBy = source.seriesLayoutBy;

        // Typed array. TODO IE10+?
        if (sourceFormat === SOURCE_FORMAT_TYPED_ARRAY) {
            if (__DEV__) {
                if (dimSize == null) {
                    throw new Error('Typed array data must specify dimension size');
                }
            }
            this._offset = 0;
            this._dimSize = dimSize;
            this._data = data;
        }

        if (__DEV__) {
            const validator = rawSourceDataValidatorMap[getMethodMapKey(sourceFormat, seriesLayoutBy)];
            validator && validator(data, source.dimensionsDefine);
        }

        mountMethods(this, data, source);
    }

    getSource(): Source {
        return this._source;
    }