#75 Added transaction logic

src/main/java/de/rwu/easydrop/service/processing/TransactionHandler.java

@@ -0,0 +1,47 @@
+package de.rwu.easydrop.service.processing;
+
+import de.rwu.easydrop.api.dto.TransactionDTO;
+import de.rwu.easydrop.data.connector.TransactionPersistenceInterface;
+import de.rwu.easydrop.model.Offer;
+import de.rwu.easydrop.model.Transaction;
+import de.rwu.easydrop.service.mapping.TransactionMapper;
+import de.rwu.easydrop.util.Timestamp;
+
+/**
+ * Handles transactions.
+ *
+ * @since 0.3.0
+ */
+public class TransactionHandler {
+    /**
+     * Transaction persistence.
+     */
+    private TransactionPersistenceInterface txPersistence;
+
+    /**
+     * Creates new transaction handler.
+     *
+     * @param txdb transaction persistence
+     */
+    public TransactionHandler(final TransactionPersistenceInterface txdb) {
+        this.txPersistence = txdb;
+    }
+
+    /**
+     * Creates transaction from offer.
+     *
+     * @param offer Offer
+     */
+    public void turnOfferToTransaction(final Offer offer) {
+        Transaction tx = new Transaction();
+        tx.setOfferId(offer.getOfferId());
+        tx.setVolume(offer.getTargetProduct().getCurrentPrice());
+        tx.setEarnings(offer.getTargetProduct().getCurrentPrice()
+                - offer.getSourceProduct().getCurrentPrice());
+        tx.setTransactionTime(Timestamp.now());
+
+        // Write transaction to persistence
+        TransactionDTO txDTO = TransactionMapper.mapTXToDTO(tx);
+        txPersistence.writeTX(txDTO);
+    }
+}