#65 - Added example project for Spring Data web support.

web/src/main/java/example/users/UserManagement.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2015 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 example.users;
+
+import java.util.Optional;
+
+import javax.transaction.Transactional;
+
+import lombok.RequiredArgsConstructor;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+import org.springframework.util.Assert;
+
+/**
+ * Domain service to register {@link User}s in the system.
+ * 
+ * @author Oliver Gierke
+ */
+@Transactional
+@Service
+@RequiredArgsConstructor(onConstructor = @__(@Autowired))
+public class UserManagement {
+
+	private final UserRepository repository;
+	private final PasswordEncoder encoder;
+
+	/**
+	 * Registers a {@link User} with the given {@link Username} and {@link Password}.
+	 * 
+	 * @param username must not be {@literal null}.
+	 * @param password must not be {@literal null}.
+	 * @return
+	 */
+	public User register(Username username, Password password) {
+
+		Assert.notNull(username, "Username must not be null!");
+		Assert.notNull(password, "Password must not be null!");
+
+		repository.findByUsername(username).ifPresent(user -> {
+			throw new IllegalArgumentException("User with that name already exists!");
+		});
+
+		Password encryptedPassword = Password.encrypted(encoder.encode(password));
+
+		return repository.save(new User(username, encryptedPassword));
+	}
+
+	/**
+	 * Returns a {@link Page} of {@link User} for the given {@link Pageable}.
+	 * 
+	 * @param pageable must not be {@literal null}.
+	 * @return
+	 */
+	public Page<User> findAll(Pageable pageable) {
+
+		Assert.notNull(pageable, "Pageable must not be null!");
+
+		return repository.findAll(pageable);
+	}
+
+	/**
+	 * Returns the {@link User} with the given {@link Username}.
+	 * 
+	 * @param username must not be {@literal null}.
+	 * @return
+	 */
+	public Optional<User> findByUsername(Username username) {
+
+		Assert.notNull(username, "Username must not be null!");
+
+		return repository.findByUsername(username);
+	}
+}