js-data-projector/src/projection-schema-registry.js

import {Service} from '@e22m4u/js-service';
import {InvalidArgumentError} from '@e22m4u/js-format';
import {validateProjectionSchemaDefinition} from './validate-projection-schema-definition.js';

/**
 * Projection schema registry.
 */
export class ProjectionSchemaRegistry extends Service {
  /**
   * Definitions.
   */
  _definitions = new Map();

  /**
   * Define schema.
   *
   * @param {object} schemaDef
   * @returns {this}
   */
  defineSchema(schemaDef) {
    validateProjectionSchemaDefinition(schemaDef);
    if (this._definitions.has(schemaDef.name)) {
      throw new InvalidArgumentError(
        'Projection schema %v is already registered.',
        schemaDef.name,
      );
    }
    this._definitions.set(schemaDef.name, schemaDef);
    return this;
  }

  /**
   * Has schema.
   *
   * @param {string} schemaName
   * @returns {boolean}
   */
  hasSchema(schemaName) {
    return this._definitions.has(schemaName);
  }

  /**
   * Get schema.
   *
   * @param {string} schemaName
   * @returns {object}
   */
  getSchema(schemaName) {
    const schemaDef = this._definitions.get(schemaName);
    if (!schemaDef) {
      throw new InvalidArgumentError(
        'Projection schema %v is not found.',
        schemaName,
      );
    }
    return schemaDef.schema;
  }

  /**
   * Get definition.
   *
   * @param {string} schemaName
   * @returns {object}
   */
  getDefinition(schemaName) {
    const schemaDef = this._definitions.get(schemaName);
    if (!schemaDef) {
      throw new InvalidArgumentError(
        'Schema definition %v is not found.',
        schemaName,
      );
    }
    return schemaDef;
  }
}