gristlabs_grist-core/app/server/lib/ServerColumnGetters.ts

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import {ColumnGetters} from 'app/common/ColumnGetters';
import * as gristTypes from 'app/common/gristTypes';
/**
*
* An implementation of ColumnGetters for the server, currently
* drawing on the data and metadata prepared for CSV export.
*
*/
export class ServerColumnGetters implements ColumnGetters {
private _rowIndices: Map<number, number>;
private _colIndices: Map<number, string>;
constructor(rowIds: number[], private _dataByColId: {[colId: string]: any}, private _columns: any[]) {
this._rowIndices = new Map<number, number>(rowIds.map((rowId, r) => [rowId, r] as [number, number]));
this._colIndices = new Map<number, string>(_columns.map(col => [col.id, col.colId] as [number, string]));
}
public getColGetter(colRef: number): ((rowId: number) => any) | null {
const colId = this._colIndices.get(colRef);
if (colId === undefined) {
return null;
}
const col = this._dataByColId[colId];
return rowId => {
const idx = this._rowIndices.get(rowId);
if (idx === undefined) {
return null;
}
return col[idx];
};
}
public getManualSortGetter(): ((rowId: number) => any) | null {
const manualSortCol = this._columns.find(c => c.colId === gristTypes.MANUALSORT);
if (!manualSortCol) {
return null;
}
return this.getColGetter(manualSortCol.id);
}
}