Added product retriever with tests

src/main/java/de/rwu/easydrop/service/retriever/ProductRetriever.java

@@ -0,0 +1,67 @@
+package de.rwu.easydrop.service.retriever;
+
+import de.rwu.easydrop.api.client.AmazonProductDataSource;
+import de.rwu.easydrop.api.client.DataSourceFactory;
+import de.rwu.easydrop.api.client.EbayItemDataSource;
+import de.rwu.easydrop.api.dto.ProductDTO;
+import de.rwu.easydrop.model.Product;
+import de.rwu.easydrop.service.mapping.ProductMapper;
+import de.rwu.easydrop.service.validation.ProductValidator;
+
+/**
+ * Retrieves Product Objects from various data sources.
+ *
+ * @since 0.2.0
+ */
+public class ProductRetriever {
+    /**
+     * Data source factory.
+     */
+    private DataSourceFactory dataSourceFactory;
+
+    /**
+     * @param newDataSourceFactory the dataSourceFactory to set
+     */
+    public void setDataSourceFactory(final DataSourceFactory newDataSourceFactory) {
+        this.dataSourceFactory = newDataSourceFactory;
+    }
+
+    /**
+     * @param newDataSourceFactory
+     */
+    public ProductRetriever(final DataSourceFactory newDataSourceFactory) {
+        this.setDataSourceFactory(newDataSourceFactory);
+    }
+
+    /**
+     * Retrieves a product from Amazon.
+     *
+     * @param asin Product identifier
+     * @return Product from Amazon
+     */
+    public Product getProductFromAmazon(final String asin) {
+        AmazonProductDataSource dataSource = dataSourceFactory.createAmazonProductDataSource();
+        ProductDTO dto = dataSource.getProductDTOById(asin);
+
+        Product product = ProductMapper.mapProductFromDTO(dto);
+        ProductValidator.validate(product);
+
+        return product;
+    }
+
+    /**
+     * Retrieves a product from eBay.
+     *
+     * @param query Product search query
+     * @return Product from eBay
+     */
+    public Product getProductFromEbay(final String query) {
+        EbayItemDataSource dataSource = dataSourceFactory.createEbayItemDataSource();
+        ProductDTO dto = dataSource.getProductDTOById(query);
+
+        Product product = ProductMapper.mapProductFromDTO(dto);
+        ProductValidator.validate(product);
+
+        return product;
+    }
+}

src/main/java/de/rwu/easydrop/service/retriever/package-info.java

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+/**
+ * Retrieves Objects from a data source.
+ *
+ * @since 0.2.0
+ */
+package de.rwu.easydrop.service.retriever;

src/test/java/de/rwu/easydrop/service/retriever/ProductRetrieverTest.java

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+package de.rwu.easydrop.service.retriever;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import javax.naming.ConfigurationException;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import de.rwu.easydrop.api.client.AmazonProductDataSource;
+import de.rwu.easydrop.api.client.DataSourceFactory;
+import de.rwu.easydrop.api.client.EbayItemDataSource;
+import de.rwu.easydrop.api.dto.ProductDTO;
+import de.rwu.easydrop.model.Product;
+import de.rwu.easydrop.util.Config;
+
+class ProductRetrieverTest {
+    @Mock
+    private Config config;
+    @Mock
+    private DataSourceFactory dataSourceFactory;
+    @Mock
+    private AmazonProductDataSource amazonDataSource;
+    @Mock
+    private EbayItemDataSource ebayDataSource;
+    @Mock
+    private ProductDTO productDTO;
+    @Mock
+    private Product product;
+
+    private ProductRetriever productRetriever;
+
+    @BeforeEach
+    void setUp() throws ConfigurationException {
+        MockitoAnnotations.openMocks(this);
+        when(config.getProperty("AMAZON_API_URL")).thenReturn("https://api.amazon.com");
+        when(config.getProperty("AMAZON_API_KEY")).thenReturn("amazon-api-key");
+        dataSourceFactory.setConfig(config);
+        productRetriever = new ProductRetriever(dataSourceFactory);
+    }
+
+    @Test
+    void getProductFromAmazon_ReturnsProduct() {
+        // Arrange
+        String asin = "B01234ABC";
+        when(dataSourceFactory.createAmazonProductDataSource()).thenReturn(amazonDataSource);
+        when(amazonDataSource.getProductDTOById(asin)).thenReturn(productDTO);
+        when(productDTO.getProductId()).thenReturn(asin);
+        when(productDTO.getCurrentPrice()).thenReturn(9.99);
+        when(productDTO.getDataOrigin()).thenReturn("Amazon");
+
+        // Act
+        Product result = productRetriever.getProductFromAmazon(asin);
+
+        // Assert
+        assertNotNull(result);
+        assertEquals(asin, result.getProductId());
+        assertEquals(9.99, result.getCurrentPrice());
+        verify(amazonDataSource, times(1)).getProductDTOById(asin);
+    }
+
+    @Test
+    void getProductFromEbay_ReturnsProduct() {
+        // Arrange
+        String productQuery = "MySearchQuery";
+        when(dataSourceFactory.createEbayItemDataSource()).thenReturn(ebayDataSource);
+        when(ebayDataSource.getProductDTOById(productQuery)).thenReturn(productDTO);
+        when(productDTO.getProductId()).thenReturn(productQuery);
+        when(productDTO.getCurrentPrice()).thenReturn(9.99);
+        when(productDTO.getDataOrigin()).thenReturn("eBay");
+
+        // Act
+        Product result = productRetriever.getProductFromEbay(productQuery);
+
+        // Assert
+        assertNotNull(result);
+        assertEquals(productQuery, result.getProductId());
+        assertEquals(9.99, result.getCurrentPrice());
+        verify(ebayDataSource, times(1)).getProductDTOById(productQuery);
+    }
+}