import { CompositeClause } from './composite-clause.model';
import { IQueryHelper } from '../interfaces/i-query-helper.interface';
import { IJoin } from '../interfaces/i-join.interface';
import { DbTable } from '../structure/db-table.model';
import { ClauseGroup } from './clause-group.model';
import { Clause } from './clause.model';
import { QueryPart } from './query-part.model';
import { QuerySelect } from './query-select.model';
import { DbHelperModel } from '../db-helper-model.model';
/**
 * @public
 * @class QueryJoin
 *
 * @description
 * For design reasons this class should not be used directly. Use this class with {@link Join} function.
 *
 * @param T @extends DbHelperModel a model declared with table and column annotations
 *
 * @example
 * ```typescript
 * // Create new model instance
 * const todo = new Todo();
 * // manipulates todo instance and then insert it
 * const select = Select(Todo);
 * const join = Join(Task).type(JoinType.LEFT).on({id: new ColumnClauseValue('taskId', select)});
 * select.join(join).where({isDone: false}).execRaw().subscribe((qr: QueryResult<any>) => {
 *      // collect todo and task, task column will be prefixed with join.alias value
 * }, (err) => {
 *      console.error(err);
 * });
 * ```
 *
 * @author  Olivier Margarit
 * @since   0.2
 */
export declare class QueryJoin<T extends DbHelperModel> implements IJoin, IQueryHelper {
    private model;
    /**
     * @private
     * @property {string} joinType
     *
     * @default JoinType.DEFAULT
     */
    private joinType;
    /**
     * @private
     * @property {ClauseGroup} onGroup group of 'on' join conditions
     */
    private onGroup;
    /**
     * @public
     * @property {string} alias alias can be setted by hand or will be automatically setted by the main query
     */
    alias: string;
    /**
     * @public
     * @constructor
     * @param {{new(): T} | QuerySelect<T>} model the model or sub query select to join
     */
    constructor(model: {
        new (): T;
    } | QuerySelect<T>);
    /**
     * @public
     * @method type set join type to join query part
     *
     * @param {string} type see JoinTypes class to check possible values
     *
     * @return {QueryJoin<T>} the current instance to chain operations
     */
    type(type: string): QueryJoin<T>;
    /**
     * @public
     * @method on method to add on join clauses
     *
     * @param {Clause|Clause[]|ClauseGroup|CompositeClause|{[index: string]: any}} clauses on join clauses
     *
     * @return {QueryJoin<T>} the current instance to chain operations
     */
    on(clauses: Clause | Clause[] | ClauseGroup | CompositeClause | {
        [index: string]: any;
    }): QueryJoin<T>;
    /**
     * @public
     * @method getProjectedTable get a virtual table to customize query projection and model retrieving
     *
     * @return {DbTable} the virtual model of the joined query
     */
    getProjectedTable(): DbTable;
    /**
     * @public
     * @method build should be removed to be a part of the private API
     *
     * @return {DbQuery} of the query with the string part and
     *          clauses params.
     */
    build(): QueryPart;
}
/**
 * @public
 * @function Join
 *
 * @description
 * Create a join part of a query to retrieve linked datas to a main query
 *
 * @param T @extends DbHelperModel a model declared with table and column annotations
 *
 * @example
 * ```typescript
 * // Create new model instance
 * const todo = new Todo();
 * // manipulates todo instance and then insert it
 * const select = Select(Todo);
 * const join = Join(Task).type(JoinType.LEFT).on({id: new ColumnClauseValue('taskId', select)});
 * select.join(join).where({isDone: false}).execRaw().subscribe((qr: QueryResult<any>) => {
 *      // collect todo and task, task column will be prefixed with join.alias value
 * }, (err) => {
 *      console.error(err);
 * });
 * ```
 *
 * @return {QueryJoin<T>} a query join instance
 *
 * @author  Olivier Margarit
 * @since   0.2
 */
export declare function Join<T extends DbHelperModel>(model: {
    new (): T;
} | QuerySelect<T>): QueryJoin<T>;