Wrote OfferWriter and following classes to save offers to persistence

src/main/java/de/rwu/easydrop/api/dto/OfferDTO.java

@@ -0,0 +1,51 @@
+package de.rwu.easydrop.api.dto;
+
+import lombok.Data;
+import de.rwu.easydrop.model.Product;
+import java.util.Date;
+
+/*
+ * Offer data transfer object
+ */
+@Data
+public class OfferDTO {
+    /**
+     * Platform internal offer identifier.
+     */
+    private String offerId;
+
+    /*
+     * The product that our software buys
+     */
+    Product sourceProduct;
+
+    /*
+     * The product that our software sells
+     */
+    Product saleProduct;
+
+    /*
+     * Date of the creation of the offer
+     * NOTE: Use Timestamp? https://docs.oracle.com/javase/8/docs/api/java/sql/Timestamp.html
+     */
+    Date creationDate;
+
+    /*
+     * Date of last update of the offer on the destination website (API)
+     */
+    Date upDate;
+
+    /*
+     * Date of last check if offer is still valid
+     */
+    Date checkDate;
+
+    /**
+     * Creates OfferDTO instance.
+     *
+     * @param newOfferId  Internal Offer identifier
+     */
+    public OfferDTO(final String newOfferId) {
+        this.offerId = newOfferId;
+    }
+}

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

@@ -1,13 +1,25 @@
 package de.rwu.easydrop.core;
 
-import de.rwu.easydrop.model.Offer;
-
 import java.util.List;
 
+import de.rwu.easydrop.data.connector.AbstractProductPersistence;
+import de.rwu.easydrop.model.Offer;
+import de.rwu.easydrop.service.retriever.ProductRetriever;
+import de.rwu.easydrop.service.writer.OfferWriter;
+
 public class OfferProvisioner {
 
+     ProductRetriever productRetriever;
+     // ProductWriter
+    AbstractProductPersistence db;
+    OfferWriter offerWriter;
+
     public OfferProvisioner(/*OfferWriter for database? */) {
 
+        //in die Klasse hardcoden, "webshop" nicht verwenden
+        //oder eine Konstante anlegen die das halten würde (besser skalierbar)
+        //die Konstante in model anlegen (in Product, Konstante valid origins)
+        this.offerWriter = new OfferWriter();
     }
 
     public void runProvisioner(List<Offer> offersToProvision) {
@@ -16,6 +28,20 @@ public class OfferProvisioner {
          * Stellt Angebote bei der Zielplattform ein
          * Schreibt eingestellte Angebote in die Datenbank          
          */
+
+        for(Offer newOffer: offersToProvision){
+            // if(newOffer.getSourceProduct().getDataOrigin().equals("ebay")){
+            //     //put newOffer on amazon
+
+            // }
+            //else put newOffer on eBay
+
+            // if successfully transmitted
+            // add to persistence
+            // "duplicate" the product with dataOrigin new platform and merchant = "me"
+            offerWriter.writeOfferToPersistence(newOffer);
+        }
+
         
 
 

src/main/java/de/rwu/easydrop/data/connector/AbstractOfferPersistence.java

@@ -0,0 +1,28 @@
+package de.rwu.easydrop.data.connector;
+
+import de.rwu.easydrop.api.dto.OfferDTO;
+
+public abstract class  AbstractOfferPersistence {
+    /**
+     * Data origin.
+     */
+    public static final String DATA_ORIGIN = "Persistence";
+
+    /**
+     * Writes a ProductDTO to persistence.
+     *
+     * @param dto
+     */
+    public abstract void saveOffer(OfferDTO dto);
+
+    /**
+     * Gets a OfferDTO from persistence.
+     */
+    //@Override
+    public abstract OfferDTO getOfferDTOById(String OfferId);
+
+    /**
+     * Deletes all data from persistence.
+     */
+    public abstract void clearData(); 
+}

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

@@ -39,4 +39,9 @@ public class Offer {
      */
     Date checkDate;
 
+    /*
+     * ID of the offer
+     */
+    String offerId;
+
 }

src/main/java/de/rwu/easydrop/service/mapping/OfferMapper.java

@@ -0,0 +1,50 @@
+package de.rwu.easydrop.service.mapping;
+
+import de.rwu.easydrop.api.dto.OfferDTO;
+
+import de.rwu.easydrop.model.Offer;
+
+/**
+ * Maps between Offer, OfferDTO and OfferDTO.
+ *
+ * @since 0.2.0
+ *
+ * @see Offer
+ * @see OfferDTO
+ * @see OfferDTO
+ */
+public final class OfferMapper {
+
+    /**
+     * Private constructor to prevent unwanted instantiation.
+     *
+     * @throws UnsupportedOperationException always
+     */
+    private OfferMapper() throws UnsupportedOperationException {
+        throw new UnsupportedOperationException("This is a mapping class, don't instantiate it.");
+    }
+
+    /**
+     * Creates a Offer object from a corresponding DTO.
+     *
+     * @param dto Offer Data Transfer Object
+     * @return Offer
+     */
+    public static Offer mapOfferFromDTO(final OfferDTO dto) {
+        Offer offer = new Offer();
+
+        return offer;
+    }
+
+    /**
+     * Creates an OfferDTO object from a corresponding offer.
+     *
+     * @param Offer offer
+     * @return OfferDTO
+     */
+    public static OfferDTO mapOfferToDTO(final Offer offer) {
+        OfferDTO dto = new OfferDTO(offer.getOfferId());
+
+        return dto;
+    }
+}

src/main/java/de/rwu/easydrop/service/validation/OfferValidator.java

@@ -0,0 +1,32 @@
+package de.rwu.easydrop.service.validation;
+import java.util.HashSet;
+import java.util.Set;
+
+import de.rwu.easydrop.exception.InvalidProductException;
+import de.rwu.easydrop.model.Product;
+import de.rwu.easydrop.model.Offer;
+
+/**
+ * Confirms validity of Offer data.
+ *
+ * @since 0.2.0
+ */
+public class OfferValidator {
+        /**
+     * Private constructor to prevent unwanted instantiation.
+     *
+     * @throws UnsupportedOperationException always
+     */
+    private OfferValidator() throws UnsupportedOperationException {
+        throw new UnsupportedOperationException("This is a validator class, don't instantiate it.");
+    }
+        /**
+     * Makes sure an Offer does not contain invalid information.
+     *
+     * @param offer the Offer
+     */
+    public static void validate(final Offer offer) {}
+}
+
+
+

src/main/java/de/rwu/easydrop/service/writer/OfferWriter.java

@@ -0,0 +1,33 @@
+package de.rwu.easydrop.service.writer;
+
+import de.rwu.easydrop.api.dto.OfferDTO;
+import de.rwu.easydrop.data.connector.AbstractOfferPersistence;
+import de.rwu.easydrop.model.Offer;
+import de.rwu.easydrop.service.mapping.OfferMapper;
+import de.rwu.easydrop.service.validation.OfferValidator;
+
+public class OfferWriter {
+    /**
+     * Persistence.
+     */
+    private AbstractOfferPersistence persistence;
+
+    /**
+     * @param newPersistence the persistence to set
+     */
+    public void setPersistence(final AbstractOfferPersistence newPersistence) {
+        this.persistence = newPersistence;
+    }
+
+    /**
+     * Validates and saves product to persistence.
+     *
+     * @param product
+     */
+    public void writeOfferToPersistence(final Offer offer) {
+        OfferValidator.validate(offer);
+        OfferDTO dto = OfferMapper.mapOfferToDTO(offer);
+
+        persistence.saveOffer(dto);
+    }
+}