src/service/ProductService.java - master - itokar98/HomeWorkPatternsSolidTask1

src/service/ProductService.java
77 строк3 KB
Ilya Tokar
first_commit
19 ноя 2025, 01:14
19 ноя 2025, 01:148a62050
package service;

import model.Product;
import repository.ProductRepository;

import java.util.List;

public class ProductService {
    private final ProductRepository productRepository;

    public ProductService(ProductRepository productRepository) {
        this.productRepository = productRepository;
    }

    public List<Product> getAllProducts() {
        return productRepository.findAll();
    }

    public Product getProductById(Long id) {
        return productRepository.findById(id)
                .orElseThrow(() -> new IllegalArgumentException("Product not found with id: " + id));
    }

    public List<Product> getProductsByCategory(String category) {
        return productRepository.findByCategory(category);
    }

    public List<Product> getProductsByManufacturer(String manufacturer) {
        return productRepository.findByManufacturer(manufacturer);
    }

    public List<Product> searchProducts(String keyword) {
        return productRepository.searchByName(keyword);
    }

    public List<Product> getProductsByPriceRange(double minPrice, double maxPrice) {
        if (minPrice < 0 || maxPrice < 0) {
            throw new IllegalArgumentException("Prices cannot be negative");
        }
        if (minPrice > maxPrice) {
            throw new IllegalArgumentException("Min price cannot be greater than max price");
        }
        return productRepository.findByPriceRange(minPrice, maxPrice);
    }

    public void addProduct(Product product) {
        validateProduct(product);
        productRepository.addProduct(product);
    }

    public void updateProduct(Product product) {
        validateProduct(product);
        productRepository.updateProduct(product);
    }

    public void deleteProduct(Long id) {
        productRepository.deleteProduct(id);
    }

    private void validateProduct(Product product) {
        if (product == null) {
            throw new IllegalArgumentException("Product cannot be null");
        }
        if (product.getName() == null || product.getName().trim().isEmpty()) {
            throw new IllegalArgumentException("Product name cannot be null or empty");
        }
        if (product.getManufacturer() == null || product.getManufacturer().trim().isEmpty()) {
            throw new IllegalArgumentException("Manufacturer cannot be null or empty");
        }
        if (product.getPrice() <= 0) {
            throw new IllegalArgumentException("Price must be positive");
        }
        if (product.getCategory() == null || product.getCategory().trim().isEmpty()) {
            throw new IllegalArgumentException("Category cannot be null or empty");
        }
    }
}