bowling-analysis-system/src/core/processors/JsonTransformer.js

A comprehensive system for analyzing bowling techniques using video processing and metrics calculation

/**
 * @module JsonTransformer
 * @description Transforms JSON data
 */

/**
 * @class JsonTransformer
 * @description Transforms JSON data
 */
class JsonTransformer {
  /**
   * Create a new JSON transformer
   * @param {Object} options - Transformer options
   */
  constructor(options = {}) {
    this.options = {
      operation: 'parse', // 'parse' or 'stringify'
      ...options
    };
  }

  /**
   * Process the input data
   * @param {string|Object} data - Input data
   * @returns {Promise<Object|string>} Transformed data
   */
  async process(data) {
    if (this.options.operation === 'parse') {
      return this._parseJson(data);
    } else if (this.options.operation === 'stringify') {
      return this._stringifyJson(data);
    } else {
      throw new Error(`Unknown operation: ${this.options.operation}`);
    }
  }

  /**
   * Parse JSON string to object
   * @param {string} data - JSON string
   * @returns {Object} Parsed object
   * @private
   */
  _parseJson(data) {
    try {
      if (typeof data !== 'string') {
        return data; // Already parsed
      }
      return JSON.parse(data);
    } catch (error) {
      console.error(`Error parsing JSON: ${error.message}`);
      throw error;
    }
  }

  /**
   * Stringify object to JSON string
   * @param {Object} data - Object to stringify
   * @returns {string} JSON string
   * @private
   */
  _stringifyJson(data) {
    try {
      if (typeof data === 'string') {
        return data; // Already stringified
      }
      
      const space = this.options.space || 2;
      const replacer = this.options.replacer || null;
      
      return JSON.stringify(data, replacer, space);
    } catch (error) {
      console.error(`Error stringifying JSON: ${error.message}`);
      throw error;
    }
  }
}

module.exports = JsonTransformer;