DATAJDBC-218 - Polishing.

Added line breaks for better readability.
Added braces to if/else statements.
Used StringUtils instead of .equals("").

Original pull request: #83.

src/main/java/org/springframework/data/relational/core/mapping/BasicRelationalPersistentProperty.java

@@ -32,6 +32,7 @@
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * Meta data about a property to be used by repository implementations.
@@ -46,6 +47,7 @@ class BasicRelationalPersistentProperty extends AnnotationBasedPersistentPropert
 	private static final Map<Class<?>, Class<?>> javaToDbType = new LinkedHashMap<>();
 
 	static {
+
 		javaToDbType.put(Enum.class, String.class);
 		javaToDbType.put(ZonedDateTime.class, String.class);
 		javaToDbType.put(Temporal.class, Date.class);
@@ -72,8 +74,11 @@ public BasicRelationalPersistentProperty(Property property, PersistentEntity<?,
 
 		this.context = context;
 		this.columnName = Lazy.of(() -> Optional.ofNullable(findAnnotation(Column.class)).map(Column::value));
-		this.keyColumnName = Lazy.of(() -> Optional.ofNullable(
-				findAnnotation(Column.class)).map(Column::keyColumn).filter(keyColumn -> !keyColumn.equals("")));
+		this.keyColumnName = Lazy.of(() -> Optional.ofNullable( //
+				findAnnotation(Column.class)) //
+				.map(Column::keyColumn) //
+				.filter(StringUtils::hasText) //
+		);
 	}
 
 	/*
@@ -120,10 +125,12 @@ public String getReverseColumnName() {
 
 	@Override
 	public String getKeyColumn() {
-		if (isQualified())
+
+		if (isQualified()) {
 			return keyColumnName.get().orElseGet(() -> context.getNamingStrategy().getKeyColumn(this));
-		else
+		} else {
 			return null;
+		}
 	}
 
 	@Override

src/test/java/org/springframework/data/relational/core/mapping/BasicRelationalPersistentPropertyUnitTests.java

@@ -89,12 +89,12 @@ public void detectsAnnotatedColumnName() {
 	@Test // DATAJDBC-218
 	public void detectsAnnotatedColumnAndKeyName() {
 
-		RelationalPersistentEntity<?> entity = context.getRequiredPersistentEntity(DummyEntity.class);
+		RelationalPersistentProperty listProperty = context //
+				.getRequiredPersistentEntity(DummyEntity.class) //
+				.getRequiredPersistentProperty("someList");
 
-		assertThat(entity.getRequiredPersistentProperty("someList").getColumnName())
-				.isEqualTo("dummy_column_name");
-		assertThat(entity.getRequiredPersistentProperty("someList").getKeyColumn())
-				.isEqualTo("dummy_key_column_name");
+		assertThat(listProperty.getColumnName()).isEqualTo("dummy_column_name");
+		assertThat(listProperty.getKeyColumn()).isEqualTo("dummy_key_column_name");
 	}
 
 	private void checkTargetType(SoftAssertions softly, RelationalPersistentEntity<?> persistentEntity,
@@ -113,8 +113,7 @@ private static class DummyEntity {
 		private final ZonedDateTime zonedDateTime;
 		private final UUID uuid;
 
-		@Column(value="dummy_column_name", keyColumn="dummy_key_column_name")
-		private List<Integer> someList;
+		@Column(value = "dummy_column_name", keyColumn = "dummy_key_column_name") private List<Integer> someList;
 
 		// DATACMNS-106
 		private @Column("dummy_name") String name;