import { Observable } from 'rxjs';
import { DataSource } from '../public-api';
import { ComparatorFn, IdentityFn, TransformFn } from '@softeq/types';
export declare enum SortDirection {
    Ascending = 0,
    Descending = 1
}
export interface DataQuerySort {
    field: string;
    direction: SortDirection;
}
export interface DataQuery {
    from: number;
    to: number;
    sort?: DataQuerySort[];
}
export interface ResultSet<T> {
    from: number;
    to: number;
    data: T[];
    total: number;
}
export declare type ResultSetSelector<T> = TransformFn<DataQuery, Observable<ResultSet<T>>>;
export declare type DataSourceOperator<T, U> = TransformFn<ResultSetSelector<T>, ResultSetSelector<U>>;
export declare type ComparatorFactory<T> = TransformFn<DataQuerySort[], ComparatorFn<T>>;
export interface DataSource<T> {
    select(query: DataQuery): Observable<ResultSet<T>>;
    pipe<U>(operator: DataSourceOperator<T, U>): DataSource<U>;
    pipe<U1, U2>(operator1: DataSourceOperator<T, U1>, operator2: DataSourceOperator<U1, U2>): DataSource<U2>;
    pipe<U1, U2, U3>(operator1: DataSourceOperator<T, U1>, operator2: DataSourceOperator<U1, U2>, operator3: DataSourceOperator<U2, U3>): DataSource<U3>;
    pipe<U1, U2, U3, U4>(operator1: DataSourceOperator<T, U1>, operator2: DataSourceOperator<U1, U2>, operator3: DataSourceOperator<U2, U3>, operator4: DataSourceOperator<U3, U4>): DataSource<U4>;
}
export declare function createDataSource<T>(selector: ResultSetSelector<T>): DataSource<T>;
export declare const EMPTY_RESULT_SET: ResultSet<any>;
export declare function getResultSetData<T>(resultSet: ResultSet<T>): T[];
export declare function emptyDataSource<T>(): DataSource<T>;
export declare function dataSourceFrom<T>(arrayOrStream: T[] | Observable<T[]>, comparatorFactory?: ComparatorFactory<T>): DataSource<T>;
export declare function mapQuery<T>(transform: IdentityFn<DataQuery>): DataSourceOperator<T, T>;
export declare function mapResultSet<T, U>(transform: TransformFn<ResultSet<T>, ResultSet<U>>): DataSourceOperator<T, U>;
export declare function mapResultSetItem<T, U>(transform: TransformFn<T, U>): DataSourceOperator<T, U>;
export declare function selectByQuery<T>(list: T[], query: DataQuery, comparatorFactory?: ComparatorFactory<T>): T[];
export declare function resultSetByQuery<T>(list: T[], query: DataQuery, comparatorFactory?: ComparatorFactory<T>): ResultSet<T>;