Webshops refactoring + checkstyle

src/main/java/de/rwu/easydrop/api/client/EbayItemDataSource.java

@@ -8,6 +8,7 @@ import com.jayway.jsonpath.PathNotFoundException;
 import com.jayway.jsonpath.ReadContext;
 
 import de.rwu.easydrop.api.dto.ProductDTO;
+import de.rwu.easydrop.model.Webshop;
 
 /**
  * Interface to an eBay data source.
@@ -18,7 +19,7 @@ public final class EbayItemDataSource extends AbstractDataSource {
     /**
      * Name of this data source.
      */
-    private static final String DATA_ORIGIN = "eBay";
+    private static final Webshop DATA_ORIGIN = Webshop.eBay;
     /**
      * Base URL to the eBay data source.
      */
@@ -77,7 +78,7 @@ public final class EbayItemDataSource extends AbstractDataSource {
     }
 
     @Override
-    protected String getDataOrigin() {
+    protected Webshop getDataOrigin() {
         return DATA_ORIGIN;
     }