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

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

/**
 * File Writer Processor
 * 
 * Writes data to a file
 * @module core/processors/FileWriter
 */
const fs = require('fs').promises;
const path = require('path');
const BaseProcessor = require('../BaseProcessor');

/**
 * @class FileWriter
 * @description Processor that writes data to a file
 * @extends BaseProcessor
 */
class FileWriter extends BaseProcessor {
  /**
   * Create a new FileWriter processor
   * @param {Object} config - Processor configuration
   * @param {string} config.filePath - Path to the file to write
   * @param {string} [config.encoding='utf8'] - File encoding
   * @param {boolean} [config.createDirectories=true] - Whether to create directories if they don't exist
   */
  constructor(config = {}) {
    super('fileWriter', config);
    this.filePath = config.filePath;
    this.encoding = config.encoding || 'utf8';
    this.createDirectories = config.createDirectories !== false;
  }

  /**
   * Process input data
   * @param {*} input - Input data to write
   * @param {Object} context - Processing context
   * @returns {Promise<string>} Path to the written file
   */
  async process(input, context) {
    const filePath = this.filePath || context?.pipeline?.options?.outputPath;
    
    if (!filePath) {
      throw new Error('No file path specified');
    }
    
    try {
      // Resolve path (support relative paths)
      const resolvedPath = path.isAbsolute(filePath) ? 
        filePath : path.resolve(process.cwd(), filePath);
      
      // Create directories if needed
      if (this.createDirectories) {
        const directory = path.dirname(resolvedPath);
        await fs.mkdir(directory, { recursive: true });
      }
      
      // Write file contents
      await fs.writeFile(resolvedPath, input, this.encoding);
      
      return resolvedPath;
    } catch (error) {
      throw new Error(`Failed to write file: ${error.message}`);
    }
  }
}

module.exports = { FileWriter };