Wrote OfferIdentifier and updated ProductRetriever

config/demo.config.properties

@@ -3,3 +3,4 @@ AMAZON_API_URL=
 AMAZON_API_KEY=
 EBAY_API_URL=
 EBAY_API_KEY=
+WEBSHOPS=amazon,ebay

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

@@ -1,6 +1,13 @@
 package de.rwu.easydrop.core;
 
 import de.rwu.easydrop.model.Offer;
+import de.rwu.easydrop.model.Product;
+import de.rwu.easydrop.model.ProductCatalogue;
+import de.rwu.easydrop.service.retriever.OfferRetriever;
+import de.rwu.easydrop.service.retriever.ProductRetriever;
+import de.rwu.easydrop.util.Config;
+
+import javax.naming.ConfigurationException;
 import java.util.List;
 import java.util.ArrayList;
 
@@ -8,11 +15,14 @@ import java.util.ArrayList;
 
 public class OfferIdentifier {
 
+    String[] webshops;
+    OfferRetriever offerRetriever;
+    ProductRetriever productRetriever;
 
 
-
-    public OfferIdentifier() {
-
+    public OfferIdentifier() throws ConfigurationException {
+        Config config = Config.getInstance();
+        this.webshops = config.getProperty("WEBSHOPS").split(",");
     }
 
     public List<Offer> runIdentifier() {
@@ -23,8 +33,43 @@ public class OfferIdentifier {
          * wenn ja, muss er die Liste um diese Angebote kürzen
          * 
          */
-        return new ArrayList<Offer>();
 
+        // 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) {
+            // 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());
+            if(product != null) {
+                catalogue.addProduct(product);
+            }
+        }
+
+        List<Offer> identifiedOffers = new ArrayList<>();
+        // Here we would call the price function that decides if is feasible to dropship the product and if, at which
+        // margin
+        // Offer possibleOffer = GenerateOfferFromCatalogue(catalogue);
+        // if(possibleOffer != null) {
+        //     identifiedOffers.add(possibleOffer);
+        // }
+
+        List<Offer> newOffers = new ArrayList<>();
+        List<Offer> existingOffers = offerRetriever.loadOffers();
+        for(Offer identifiedOffer: identifiedOffers) {
+            boolean isNew = true;
+            for(Offer existingOffer: existingOffers) {
+                if(existingOffer.getSourceProduct().getProductId().equals(identifiedOffer.getSourceProduct().getProductId())) {
+                    isNew = false;
+                    break;
+                }
+            }
+            if(isNew) {
+                newOffers.add(identifiedOffer);
+            }
+        }
+
+        return newOffers;
     }
     
     

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

@@ -23,11 +23,6 @@ public class Offer {
      */
     Product saleProduct;
 
-    /*
-     * Boolean to check if sourceProduct is still available on source website
-     */
-    boolean availability;
-
     /*
      * Date of the creation of the offer
      * NOTE: Use Timestamp? https://docs.oracle.com/javase/8/docs/api/java/sql/Timestamp.html
@@ -44,9 +39,4 @@ public class Offer {
      */
     Date checkDate;
 
-
-
-
-
-    
 }

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

@@ -0,0 +1,14 @@
+package de.rwu.easydrop.service.retriever;
+
+import de.rwu.easydrop.model.Offer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class OfferRetriever {
+
+    public List<Offer> loadOffers() {
+        return new ArrayList<>();
+    }
+
+}

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

@@ -81,4 +81,28 @@ public class ProductRetriever {
 
         return product;
     }
+
+    /**
+     * Retrieves a product from an API by name of the API so that high-level components do not need to be extended
+     * with exact function call names if we extend the list of webshops.
+     *
+     * @param dataSourceName Data source name, e.g. amazon
+     * @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":
+            // TODO: Translation from productName to productId (Amazon) needed
+            return getProductFromAmazon(productName);
+        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;
+        }
+    }
 }