Use xml / javaconfig folders for samples

Fixes gh-3752

samples/xml/tutorial/src/main/java/bigbank/BankServiceImpl.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package bigbank;
+
+import org.springframework.util.Assert;
+
+public class BankServiceImpl implements BankService {
+	private final BankDao bankDao;
+
+	public BankServiceImpl(BankDao bankDao) {
+		Assert.notNull(bankDao);
+		this.bankDao = bankDao;
+	}
+
+	public Account[] findAccounts() {
+		return this.bankDao.findAccounts();
+	}
+
+	public Account post(Account account, double amount) {
+		Assert.notNull(account);
+
+		// We read account back from DAO so it reflects the latest balance
+		Account a = bankDao.readAccount(account.getId());
+		if (a == null) {
+			throw new IllegalArgumentException("Couldn't find requested account");
+		}
+
+		a.setBalance(a.getBalance() + amount);
+		bankDao.createOrUpdateAccount(a);
+		return a;
+	}
+
+	public Account readAccount(Long id) {
+		return bankDao.readAccount(id);
+	}
+}