Wrote Enum for webshops

changed code in respective classes

src/main/java/de/rwu/easydrop/core/OfferIdentifier.java

@@ -15,15 +15,12 @@ import java.util.ArrayList;
 
 public class OfferIdentifier {
 
-    String[] webshops;
+    
     OfferRetriever offerRetriever;
     ProductRetriever productRetriever;
 
 
-    public OfferIdentifier() {
-        Config config = Config.getInstance();
-        this.webshops = config.getProperty("WEBSHOPS").split(",");
-    }
+    public OfferIdentifier() {}
 
     public List<Offer> runIdentifier() {
         /* muss die Kataloge durchforsten nach vergleichbaren Produkten auf mehreren Händlerwebseiten (APIs)
@@ -37,7 +34,7 @@ public class OfferIdentifier {
         // Just an example here taken from demo.products-config.json; should be generic and configurable either via
         // JSON or the database later.
         ProductCatalogue catalogue = new ProductCatalogue("Gigabyte GeForce RTX 3060", "Very epic GPU");
-        for(String webshop: this.webshops) {
+        for(Product.webshop webshop: Product.webshop.values()) {
             // The product retriever should know what API with which ProductID to query; high-level components should not know about such
             // things.
             Product product = this.productRetriever.getProductFromDataSource(webshop, catalogue.getProductName());

src/main/java/de/rwu/easydrop/model/Product.java

@@ -10,6 +10,13 @@ import lombok.Data;
  */
 @Data
 public class Product {
+   /*
+    * Constants for data source/destination platforms
+    */
+   public enum webshop{
+    AMAZON, EBAY
+   } 
+   
     /**
      * Data source platform, like "Amazon".
      */

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

@@ -90,17 +90,14 @@ public class ProductRetriever {
      * @param productName Product name, translated to the correct product ID for the data source
      * @return Product from that data source or null if data source not available
      */
-    public Product getProductFromDataSource(final String dataSourceName, final String productName) {
-        switch(dataSourceName.toLowerCase()) {
-        case "amazon":
+    public Product getProductFromDataSource(Product.webshop dataSourceName, final String productName) {
+        switch(dataSourceName) {
+        case AMAZON:
             // TODO: Translation from productName to productId (Amazon) needed
             return getProductFromAmazon(productName);
-        case "ebay":
+        case EBAY:
             // TODO: Translation from productName to productId (eBay) needed
             return getProductFromEbay(productName);
-        case "persistence":
-            // TODO: Translation from productName to productId (persistence layer) needed
-            return getProductFromPersistence(productName);
         default:
             return null;
         }