import { Action } from "./Action";
import { ParamMetadata } from "./metadata/ParamMetadata";
import { TypeStackFramework } from "./TypeStackFramework";
/**
 * Handles action parameter.
 */
export declare class ActionParameterHandler {
    private framework;
    constructor(framework: TypeStackFramework);
    /**
     * Handles each parameter in the given action.
     * Since parameter handling can return promises we return array of mixed values which can include promises,
     * and a flag which indicates if there is at least one promise in the handled values.
     */
    handle(action: Action): {
        values: (Promise<any> | any)[];
        hasPromises: boolean;
    };
    /**
     * Handles a single action parameter.
     */
    protected handleParameter(action: Action, param: ParamMetadata): Promise<any> | any;
    /**
     * Gets parameter from the request.
     */
    protected getParamFromRequest(action: Action, param: ParamMetadata): any;
    /**
     * Handles non-promise value.
     */
    protected handleValue(value: any, action: Action, param: ParamMetadata): Promise<any> | any;
    /**
     * Normalizes parameter value.
     */
    protected normalizeParamValue(value: any, param: ParamMetadata): Promise<any> | any;
    /**
     * Parses string value into a JSON object.
     */
    protected parseValue(value: any, paramMetadata: ParamMetadata): any;
    /**
     * Perform class-transformation if enabled.
     */
    protected transformValue(value: any, paramMetadata: ParamMetadata): any;
    /**
     * Perform class-validation if enabled.
     */
    protected validateValue(value: any, paramMetadata: ParamMetadata): Promise<any> | any;
}