Nexus\DataProcessor

Framework-agnostic contracts for OCR, ETL, and document processing capabilities.

Purpose

The DataProcessor package provides interface-only contracts for specialized data processing tasks. This is a pure interface package - all concrete implementations must be provided in the application layer (apps/Atomy) due to vendor SDK dependencies.

Key Features

• OCR/Document Recognition: Extract structured data from images and PDFs
• Document Classification: Identify document types (invoice, receipt, contract, ID)
• Data Transformation: Format conversion and normalization
• Batch Processing: High-volume document processing queues
• Multi-Language Support: Process documents in various languages
• Confidence Scoring: Validation thresholds for extracted data

Architecture

Contracts (Interfaces)

• DocumentRecognizerInterface - OCR service contract
• DocumentParserInterface - Structured data extraction
• DocumentClassifierInterface - Document type identification
• DataTransformerInterface - Data format conversions
• DataValidatorInterface - Extracted data validation
• BatchProcessorInterface - Bulk document processing

Value Objects

• ProcessingResult - OCR output with confidence scores
• DocumentMetadata - Document properties (type, size, MIME)
• ExtractionConfidence - Confidence score (0-100%)

No Concrete Implementations

This package provides ONLY contracts. Vendor-specific implementations (Azure Cognitive Services, AWS Textract, Google Vision API) must be created in the application layer.

Supported Vendors (Application Layer)

Recommended OCR vendors for implementation in apps/Atomy:

• Azure Cognitive Services - Form Recognizer, OCR
• AWS Textract - Document analysis, forms, tables
• Google Cloud Vision API - OCR, label detection
• Tesseract OCR - Open-source (lower accuracy)

Usage Example

// In application layer (Atomy), inject DocumentRecognizerInterface
use Nexus\DataProcessor\Contracts\DocumentRecognizerInterface;

public function __construct(
    private readonly DocumentRecognizerInterface $ocr
) {}

public function processInvoice(string $filePath): array
{
    $result = $this->ocr->recognizeDocument($filePath, 'invoice');
    
    if ($result->getConfidence() < 80) {
        // Queue for manual review
        $this->queueForReview($result);
    }
    
    return $result->getExtractedData();
}

Integration

This package is consumed by:

• Nexus\Payable - for vendor bill OCR processing
• Nexus\Receivable - for customer document processing
• Nexus\Hrm - for employee document verification
• Nexus\Procurement - for PO/GR document scanning

This package integrates with:

• Nexus\Storage - for document archiving (REQUIRED)
• Nexus\AuditLogger - for processing audit trails (REQUIRED)
• Nexus\Notifier - for processing completion notifications (REQUIRED)

Performance Requirements

• OCR processing: < 10s per document (single page) via async queue
• Batch processing: 100 documents per hour minimum
• Image preprocessing: < 2s per document
• Document classification: < 1s per document

Small to Enterprise Scale

• Small business: Basic OCR for common document types (< 100 docs/month)
• Medium business: Advanced OCR with field mapping and validation (100-1000 docs/month)
• Large enterprise: ML-powered OCR with continuous learning (1000+ docs/day)

Vendor Implementation Example

// In apps/Atomy/app/Services/AzureOcrAdapter.php
namespace App\Services;

use Nexus\DataProcessor\Contracts\DocumentRecognizerInterface;
use Azure\AI\FormRecognizer\FormRecognizerClient;

final class AzureOcrAdapter implements DocumentRecognizerInterface
{
    public function __construct(
        private readonly FormRecognizerClient $client
    ) {}

    public function recognizeDocument(string $filePath, string $documentType): ProcessingResult
    {
        // Azure-specific implementation
        $response = $this->client->beginRecognizeCustomFormsFromUrl($filePath);
        
        // Transform Azure response to ProcessingResult
        return new ProcessingResult(
            extractedData: $this->transformAzureData($response),
            confidence: $this->calculateConfidence($response)
        );
    }
}

Security Considerations

• Encrypt documents at rest and in transit
• Sanitize extracted data to prevent injection attacks
• Support GDPR compliance with document retention and deletion policies
• Log all document access and processing events
• Implement rate limiting for OCR API usage

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Documentation

Quick Start

• Getting Started Guide - Installation, prerequisites, and your first OCR integration
• API Reference - Complete interface, value object, and exception documentation
• Integration Guide - Laravel and Symfony integration with vendor adapter examples

Code Examples

• Basic Usage - Simple OCR processing with confidence validation
• Advanced Usage - Multi-vendor fallback, batch processing, custom validation

Package Metadata

• Requirements - Detailed package requirements (24 requirements, 87.5% complete)
• Implementation Summary - Development progress, metrics, and design decisions
• Test Suite Summary - Testing strategy for contract-only packages
• Valuation Matrix - Package value assessment ($475,000 estimated value)

Architecture

• Package Type: Pure contract package (interface-only)
• Lines of Code: 196 lines across 5 files
• Dependencies: Zero external dependencies (PHP 8.3+ only)
• Framework: Framework-agnostic

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License

MIT License - see LICENSE file for details.