Polish "Add support for Couchbase's role-based access"

Closes gh-16389

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/couchbase/CouchbaseConfiguration.java

@@ -59,12 +59,11 @@ public class CouchbaseConfiguration {
 	public Cluster couchbaseCluster() {
 		CouchbaseCluster couchbaseCluster = CouchbaseCluster
 				.create(couchbaseEnvironment(), determineBootstrapHosts());
-		if (this.properties.getUsername().isEmpty()
-				|| this.properties.getPassword().isEmpty()) {
-			return couchbaseCluster;
+		if (isRoleBasedAccessControlEnabled()) {
+			return couchbaseCluster.authenticate(this.properties.getUsername(),
+					this.properties.getPassword());
 		}
-		return couchbaseCluster.authenticate(this.properties.getUsername(),
-				this.properties.getPassword());
+		return couchbaseCluster;
 	}
 
 	/**
@@ -86,12 +85,16 @@ public class CouchbaseConfiguration {
 	@Bean
 	@Primary
 	public Bucket couchbaseClient() {
-		if (this.properties.getUsername().isEmpty()
-				|| this.properties.getPassword().isEmpty()) {
-			return couchbaseCluster().openBucket(this.properties.getBucket().getName(),
-					this.properties.getBucket().getPassword());
+		if (isRoleBasedAccessControlEnabled()) {
+			return couchbaseCluster().openBucket(this.properties.getBucket().getName());
 		}
-		return couchbaseCluster().openBucket(this.properties.getBucket().getName());
+		return couchbaseCluster().openBucket(this.properties.getBucket().getName(),
+				this.properties.getBucket().getPassword());
+	}
+
+	private boolean isRoleBasedAccessControlEnabled() {
+		return this.properties.getUsername() != null
+				&& this.properties.getPassword() != null;
 	}
 
 	/**

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/couchbase/CouchbaseProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.boot.autoconfigure.couchbase;
 
 import java.time.Duration;
@@ -37,20 +38,20 @@ public class CouchbaseProperties {
 	 */
 	private List<String> bootstrapHosts;
 
+	/**
+	 * Cluster username when using role based access.
+	 */
+	private String username;
+
+	/**
+	 * Cluster password when using role based access.
+	 */
+	private String password;
+
 	private final Bucket bucket = new Bucket();
 
 	private final Env env = new Env();
 
-	/**
-	 * Password of the cluster on RBA(role base access).
-	 */
-	private String password = "";
-
-	/**
-	 * Username of the cluster on RBA(role base access).
-	 */
-	private String username = "";
-
 	public List<String> getBootstrapHosts() {
 		return this.bootstrapHosts;
 	}
@@ -59,12 +60,12 @@ public class CouchbaseProperties {
 		this.bootstrapHosts = bootstrapHosts;
 	}
 
-	public Bucket getBucket() {
-		return this.bucket;
+	public String getUsername() {
+		return this.username;
 	}
 
-	public Env getEnv() {
-		return this.env;
+	public void setUsername(String username) {
+		this.username = username;
 	}
 
 	public String getPassword() {
@@ -75,12 +76,12 @@ public class CouchbaseProperties {
 		this.password = password;
 	}
 
-	public String getUsername() {
-		return this.username;
+	public Bucket getBucket() {
+		return this.bucket;
 	}
 
-	public void setUsername(String username) {
-		this.username = username;
+	public Env getEnv() {
+		return this.env;
 	}
 
 	public static class Bucket {