Add banking implementation

hexagonal/src/main/java/com/iluwatar/hexagonal/banking/WireTransfers.java

@@ -24,12 +24,13 @@ package com.iluwatar.hexagonal.banking;
 
 /**
  * 
- * Interface to the lottery service provider's bank account.
+ * Interface to bank accounts.
  *
  */
 public interface WireTransfers {
 
-  int getCurrentFundsAmount();
+  void setFunds(String bankAccount, int amount);
-  boolean transferFunds(int amount, String receiverBankAccountNumber);
+  int getFunds(String bankAccount);
+  boolean transferFunds(int amount, String sourceBackAccount, String destinationBankAccount);
   
 }

hexagonal/src/main/java/com/iluwatar/hexagonal/banking/WireTransfersImpl.java

@@ -0,0 +1,57 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.hexagonal.banking;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * 
+ * Banking implementation
+ *
+ */
+public class WireTransfersImpl implements WireTransfers {
+
+  private static Map<String, Integer> accounts = new HashMap<>();
+  
+  @Override
+  public void setFunds(String bankAccount, int amount) {
+    accounts.put(bankAccount, amount);
+  }
+
+  @Override
+  public int getFunds(String bankAccount) {
+    return accounts.getOrDefault(bankAccount, 0);
+  }
+
+  @Override
+  public boolean transferFunds(int amount, String sourceBackAccount, String destinationBankAccount) {
+    if (accounts.getOrDefault(sourceBackAccount, 0) >= amount) {
+      accounts.put(sourceBackAccount, accounts.get(sourceBackAccount) - amount);
+      accounts.put(destinationBankAccount, accounts.get(destinationBankAccount) + amount);
+      return true;
+    } else {
+      return false;
+    }
+  }
+}

hexagonal/src/test/java/com/iluwatar/hexagonal/banking/WireTransfersTest.java

@@ -0,0 +1,50 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.hexagonal.banking;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * 
+ * Tests for banking
+ *
+ */
+public class WireTransfersTest {
+
+  private final WireTransfers bank = new WireTransfersImpl();
+  
+  @Test
+  public void testInit() {
+    assertEquals(bank.getFunds("foo"), 0);
+    bank.setFunds("foo", 100);
+    assertEquals(bank.getFunds("foo"), 100);
+    bank.setFunds("bar", 150);
+    assertEquals(bank.getFunds("bar"), 150);
+    assertTrue(bank.transferFunds(50, "bar", "foo"));
+    assertEquals(bank.getFunds("foo"), 150);
+    assertEquals(bank.getFunds("bar"), 100);
+  }
+}