#75 Added transaction base classes

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

@@ -0,0 +1,28 @@
+package de.rwu.easydrop.api.dto;
+
+import lombok.Data;
+
+/**
+ * Transaction data transfer object.
+ *
+ * @since 0.3.0
+ */
+@Data
+public class TransactionDTO {
+    /**
+     * Offer ID.
+     */
+    private String offerId;
+    /**
+     * Sales volume.
+     */
+    private double volume;
+    /**
+     * Earnings (volume - cost).
+     */
+    private double earnings;
+    /**
+     * Transaction timestamp.
+     */
+    private String transactionTime;
+}

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

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+package de.rwu.easydrop.model;
+
+import lombok.Data;
+
+/**
+ * A transaction.
+ *
+ * @since 0.3.0
+ */
+@Data
+public class Transaction {
+    /**
+     * Offer ID.
+     *
+     * @see Offer
+     */
+    private String offerId;
+    /**
+     * Sales volume.
+     */
+    private double volume;
+    /**
+     * Earnings (volume - cost).
+     */
+    private double earnings;
+    /**
+     * Transaction timestamp.
+     */
+    private String transactionTime;
+}

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

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+package de.rwu.easydrop.service.mapping;
+
+import de.rwu.easydrop.api.dto.TransactionDTO;
+import de.rwu.easydrop.model.Transaction;
+
+/**
+ * Maps transaction DTOs and objects.
+ *
+ * @since 0.3.0
+ */
+public final class TransactionMapper {
+    /**
+     * Private constructor to prevent unwanted instantiation.
+     *
+     * @throws UnsupportedOperationException always
+     */
+    private TransactionMapper() throws UnsupportedOperationException {
+        throw new UnsupportedOperationException("This is a mapping class, don't instantiate it.");
+    }
+
+    /**
+     * Creates a Transaction object from a corresponding DTO.
+     *
+     * @param dto Transaction Data Transfer Object
+     * @return Product
+     */
+    public static Transaction mapTXFromDTO(final TransactionDTO dto) {
+        Transaction tx = new Transaction();
+
+        tx.setOfferId(dto.getOfferId());
+        tx.setVolume(dto.getVolume());
+        tx.setEarnings(dto.getEarnings());
+        tx.setTransactionTime(dto.getTransactionTime());
+
+        return tx;
+    }
+
+    /**
+     * Creates a ProductDTO object from a corresponding Product.
+     *
+     * @param tx Transaction
+     * @return TransactionDTO
+     */
+    public static TransactionDTO mapTXToDTO(final Transaction tx) {
+        TransactionDTO dto = new TransactionDTO();
+
+        dto.setOfferId(tx.getOfferId());
+        dto.setVolume(tx.getVolume());
+        dto.setEarnings(tx.getEarnings());
+        dto.setTransactionTime(tx.getTransactionTime());
+
+        return dto;
+    }
+}