Improve readability in RedisQueryCreator.

Closes #2788

Author: junghoon-vans

src/main/java/org/springframework/data/redis/repository/query/RedisQueryCreator.java

@@ -29,6 +29,7 @@
 import org.springframework.data.repository.query.parser.AbstractQueryCreator;
 import org.springframework.data.repository.query.parser.Part;
 import org.springframework.data.repository.query.parser.PartTree;
+import org.springframework.lang.Nullable;
 import org.springframework.util.CollectionUtils;
 
 /**
@@ -37,6 +38,7 @@
  * @author Christoph Strobl
  * @author Mark Paluch
  * @author John Blum
+ * @author Junghoon Ban
  * @since 1.7
  */
 public class RedisQueryCreator extends AbstractQueryCreator<KeyValueQuery<RedisOperationChain>, RedisOperationChain> {
@@ -78,16 +80,16 @@ protected RedisOperationChain or(RedisOperationChain base, RedisOperationChain c
 	}
 
 	@Override
-	protected KeyValueQuery<RedisOperationChain> complete(final RedisOperationChain criteria, Sort sort) {
+	protected KeyValueQuery<RedisOperationChain> complete(@Nullable final RedisOperationChain criteria, Sort sort) {
 
 		KeyValueQuery<RedisOperationChain> query = new KeyValueQuery<>(criteria);
 
-		if (query.getCriteria() != null && !CollectionUtils.isEmpty(query.getCriteria().getSismember())
-				&& !CollectionUtils.isEmpty(query.getCriteria().getOrSismember()))
-			if (query.getCriteria().getSismember().size() == 1 && query.getCriteria().getOrSismember().size() == 1) {
+		if (criteria != null && !CollectionUtils.isEmpty(criteria.getSismember())
+				&& !CollectionUtils.isEmpty(criteria.getOrSismember()))
+			if (criteria.getSismember().size() == 1 && criteria.getOrSismember().size() == 1) {
 
-				query.getCriteria().getOrSismember().add(query.getCriteria().getSismember().iterator().next());
-				query.getCriteria().getSismember().clear();
+				criteria.getOrSismember().add(criteria.getSismember().iterator().next());
+				criteria.getSismember().clear();
 			}
 
 		if (sort.isSorted()) {
@@ -99,43 +101,39 @@ protected KeyValueQuery<RedisOperationChain> complete(final RedisOperationChain
 
 	private NearPath getNearPath(Part part, Iterator<Object> iterator) {
 
+		String path = part.getProperty().toDotPath();
 		Object value = iterator.next();
 
-		Point point;
-		Distance distance;
-
-		if (value instanceof Circle) {
-			point = ((Circle) value).getCenter();
-			distance = ((Circle) value).getRadius();
-		} else if (value instanceof Point) {
+		if (value instanceof Circle circle) {
+			return new NearPath(path, circle.getCenter(), circle.getRadius());
+		}
 
-			point = (Point) value;
+		if (value instanceof Point point) {
 
 			if (!iterator.hasNext()) {
 				String message = "Expected to find distance value for geo query; Are you missing a parameter";
 				throw new InvalidDataAccessApiUsageException(message);
 			}
 
+			Distance distance;
 			Object distObject = iterator.next();
-			if (distObject instanceof Distance) {
-				distance = (Distance) distObject;
-			} else if (distObject instanceof Number) {
-				distance = new Distance(((Number) distObject).doubleValue(), Metrics.KILOMETERS);
+
+			if (distObject instanceof Distance distanceValue) {
+				distance = distanceValue;
+			} else if (distObject instanceof Number numberValue) {
+				distance = new Distance(numberValue.doubleValue(), Metrics.KILOMETERS);
 			} else {
 
 				String message = String.format("Expected to find Distance or Numeric value for geo query but was %s",
 						distObject.getClass());
-
 				throw new InvalidDataAccessApiUsageException(message);
 			}
-		} else {
-
-			String message = String.format("Expected to find a Circle or Point/Distance for geo query but was %s.",
-					value.getClass());
 
-			throw new InvalidDataAccessApiUsageException(message);
+			return new NearPath(path, point, distance);
 		}
 
-		return new NearPath(part.getProperty().toDotPath(), point, distance);
+		String message = String.format("Expected to find a Circle or Point/Distance for geo query but was %s.",
+				value.getClass());
+		throw new InvalidDataAccessApiUsageException(message);
 	}
 }