import { FilteringLogic, IFilteringExpression } from './filtering-expression.interface';
import { IBaseEventArgs } from '../core/utils';
export declare enum FilteringExpressionsTreeType {
    Regular = 0,
    Advanced = 1
}
export declare interface IExpressionTree {
    filteringOperands: (IExpressionTree | IFilteringExpression)[];
    operator: FilteringLogic;
    fieldName?: string | null;
    entity?: string | null;
    returnFields?: string[] | null;
}
export declare interface IFilteringExpressionsTree extends IBaseEventArgs, IExpressionTree {
    filteringOperands: (IFilteringExpressionsTree | IFilteringExpression)[];
    type?: FilteringExpressionsTreeType;
    /**
     * @deprecated in version 18.2.0. Use `ExpressionsTreeUtil.find` instead.
     */
    find?: (fieldName: string) => IFilteringExpressionsTree | IFilteringExpression;
    /**
     * @deprecated in version 18.2.0. Use `ExpressionsTreeUtil.findIndex` instead.
     */
    findIndex?: (fieldName: string) => number;
}
export declare class FilteringExpressionsTree implements IFilteringExpressionsTree {
    /**
     * Sets/gets the filtering operands.
     * ```typescript
     * const gridExpressionsTree = new FilteringExpressionsTree(FilteringLogic.And);
     * const expression = [
     * {
     *   condition: IgxStringFilteringOperand.instance().condition('contains'),
     *   fieldName: 'Column Field',
     *   searchVal: 'Value',
     *   ignoreCase: false
     * }];
     * gridExpressionsTree.filteringOperands.push(expression);
     * this.grid.filteringExpressionsTree = gridExpressionsTree;
     * ```
     * ```typescript
     * let filteringOperands = gridExpressionsTree.filteringOperands;
     * ```
     *
     * @memberof FilteringExpressionsTree
     */
    filteringOperands: (IFilteringExpressionsTree | IFilteringExpression)[];
    /**
     * Sets/gets the operator.
     * ```typescript
     * gridExpressionsTree.operator = FilteringLogic.And;
     * ```
     * ```typescript
     * let operator = gridExpressionsTree.operator;
     * ```
     *
     * @memberof FilteringExpressionsTree
     */
    operator: FilteringLogic;
    /**
     * Sets/gets the field name of the column where the filtering expression is placed.
     * ```typescript
     * gridExpressionTree.fieldName = 'Column Field';
     * ```
     * ```typescript
     * let columnField = expressionTree.fieldName;
     * ```
     *
     * @memberof FilteringExpressionsTree
     */
    fieldName?: string;
    /**
     * Sets/gets the type of the filtering expressions tree.
     * ```typescript
     * gridExpressionTree.type = FilteringExpressionsTree.Advanced;
     * ```
     * ```typescript
     * let type = expressionTree.type;
     * ```
     *
     * @memberof FilteringExpressionsTree
     */
    type?: FilteringExpressionsTreeType;
    /**
     * Sets/gets the entity.
     * ```typescript
     * gridExpressionsTree.entity = 'Entity A';
     * ```
     * ```typescript
     * let entity = gridExpressionsTree.entity;
     * ```
     *
     * @memberof FilteringExpressionsTree
     */
    entity?: string;
    /**
     * Sets/gets the return fields.
     * ```typescript
     * gridExpressionsTree.returnFields = ['Column Field 1', 'Column Field 2'];
     * ```
     * ```typescript
     * let returnFields = gridExpressionsTree.returnFields;
     * ```
     *
     * @memberof FilteringExpressionsTree
     */
    returnFields?: string[];
    constructor(operator: FilteringLogic, fieldName?: string, entity?: string, returnFields?: string[]);
    /**
     * Checks if filtering expressions tree is empty.
     *
     * @param expressionTree filtering expressions tree.
     */
    static empty(expressionTree: IFilteringExpressionsTree): boolean;
    /**
     * Returns the filtering expression for a column with the provided fieldName.
     * ```typescript
     * let filteringExpression = gridExpressionTree.find('Column Field');
     * ```
     *
     * @memberof FilteringExpressionsTree
     * @deprecated in version 18.2.0. Use `ExpressionsTreeUtil.find` instead.
     */
    find(fieldName: string): IFilteringExpressionsTree | IFilteringExpression;
    /**
     * Returns the index of the filtering expression for a column with the provided fieldName.
     * ```typescript
     * let filteringExpressionIndex = gridExpressionTree.findIndex('Column Field');
     * ```
     *
     * @memberof FilteringExpressionsTree
     * @deprecated in version 18.2.0. Use `ExpressionsTreeUtil.findIndex` instead.
     */
    findIndex(fieldName: string): number;
}