import { Disposable, Listener } from '@vertexvis/utils';
import { MeasurementEntity } from './entities';
import { MeasurementOutcome } from './outcomes';
import { MeasurementResult } from './results';
/**
 * A model representing the state of measurement.
 *
 * Measurement contains a set of `MeasureEntity`s that represent what's being
 * measured, and a set of `MeasurementResult`s representing the results of the
 * measurement.
 *
 * Views can register event listeners to the model to be notified when new
 * measurements have been added.
 */
export declare class MeasurementModel {
    private entities;
    private outcome?;
    private results;
    private entitiesChanged;
    private outcomeChanged;
    /**
     * Registers an entity to be measured with the model.
     *
     * @param entity An entity to measure.
     * @returns `true` if the entity has been added.
     */
    addEntity(entity: MeasurementEntity): boolean;
    /**
     * Clears all registered entities from the model.
     */
    clearEntities(): void;
    /**
     * Clears the outcome containing the results of a measurement.
     */
    clearOutcome(): void;
    /**
     * Sets the outcome containing the results of a measurement.
     *
     * Emits a _outcome changed_ event.
     *
     * @param outcome The outcome containing results.
     */
    setOutcome(outcome: MeasurementOutcome | undefined): void;
    /**
     * Returns all the entities registered with the model.
     */
    getEntities(): MeasurementEntity[];
    /**
     * Returns the outcome that contains the results of a measurement.
     */
    getOutcome(): MeasurementOutcome | undefined;
    /**
     * Returns all the measurement results of the model.
     */
    getResults(): MeasurementResult[];
    /**
     * Unregisters an entity from the model.
     *
     * @param entity The entity to remove.
     * @returns `true` if the entity was removed.
     */
    removeEntity(entity: MeasurementEntity): boolean;
    /**
     * Sets the set of entities to be measured with the model.
     *
     * @param entities A set of entities to measure.
     * @returns `true` if the entity has been added.
     */
    setEntities(entities: Set<MeasurementEntity>): boolean;
    /**
     * Registers an event listener that will be invoked when the model's outcome
     * changes.
     *
     * @param listener The listener to add.
     * @returns A disposable that can be used to remove the listener.
     */
    onOutcomeChanged(listener: Listener<MeasurementOutcome | undefined>): Disposable;
    /**
     * Registers an event listener that will be invoked when the model's
     * measurement entities change.
     *
     * @param listener The listener to add.
     * @returns A disposable that can be used to remove the listener.
     */
    onEntitiesChanged(listener: Listener<MeasurementEntity[]>): Disposable;
}