Webshops refactoring + checkstyle

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

@@ -3,6 +3,8 @@ package de.rwu.easydrop.api.client;
 import java.net.MalformedURLException;
 import java.net.URL;
 
+import de.rwu.easydrop.model.Webshop;
+
 /**
  * Sends a buy request to the eBay API.
  *
@@ -12,7 +14,7 @@ public final class EbayPurchaser extends AbstractPurchaser {
     /**
      * Name of this data source.
      */
-    private static final String DATA_TARGET = "eBay";
+    private static final Webshop DATA_TARGET = Webshop.eBay;
     /**
      * Base URL to the eBay Purchase API.
      */
@@ -46,7 +48,7 @@ public final class EbayPurchaser extends AbstractPurchaser {
     }
 
     @Override
-    protected String getDataTarget() {
+    protected Webshop getDataTarget() {
         return DATA_TARGET;
     }
 }