js-data-projector/src/data-projector.js

import {Service} from '@e22m4u/js-service';
import {projectData} from './project-data.js';
import {ProjectionSchemaRegistry} from './projection-schema-registry.js';

/**
 * Data projector.
 */
export class DataProjector extends Service {
  /**
   * Define schema.
   *
   * @param {object} schemaDef
   * @returns {this}
   */
  defineSchema(schemaDef) {
    this.getService(ProjectionSchemaRegistry).defineSchema(schemaDef);
    return this;
  }

  /**
   * Project.
   *
   * @param {object|object[]|*} data
   * @param {object|Function|string} schema
   * @param {object} [options]
   * @returns {*}
   */
  project(data, schema, options) {
    const registry = this.getService(ProjectionSchemaRegistry);
    const defaultNameResolver = name => registry.getSchema(name);
    const nameResolver =
      (options && options.nameResolver) || defaultNameResolver;
    const factoryArgs = (options && options.factoryArgs) || [this.container];
    return projectData(data, schema, {...options, nameResolver, factoryArgs});
  }

  /**
   * Project input.
   *
   * @param {object|object[]|*} data
   * @param {object|Function|string} schema
   * @param {object} [options]
   * @returns {*}
   */
  projectInput(data, schema, options) {
    return this.project(data, schema, {...options, scope: 'input'});
  }

  /**
   * Project output.
   *
   * @param {object|object[]|*} data
   * @param {object|Function|string} schema
   * @param {object} [options]
   * @returns {*}
   */
  projectOutput(data, schema, options) {
    return this.project(data, schema, {...options, scope: 'output'});
  }
}