DATAMONGO-2449 - Polishing.

Reformat code. Tweak Javadoc.

Original pull request: #827.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/query/Meta.java

@@ -169,11 +169,32 @@ public class Meta {
 		return flags;
 	}
 
+	/**
+	 * When set to {@literal true}, aggregation stages can write data to disk.
+	 *
+	 * @return {@literal null} if not set.
+	 * @since 3.0
+	 */
+	@Nullable
+	public Boolean getAllowDiskUse() {
+		return allowDiskUse;
+	}
+
+	/**
+	 * Set to {@literal true}, to allow aggregation stages to write data to disk.
+	 *
+	 * @param allowDiskUse use {@literal null} for server defaults.
+	 * @since 3.0
+	 */
+	public void setAllowDiskUse(@Nullable Boolean allowDiskUse) {
+		this.allowDiskUse = allowDiskUse;
+	}
+
 	/**
 	 * @return
 	 */
 	public boolean hasValues() {
-		return !this.values.isEmpty() || !this.flags.isEmpty() || this.cursorBatchSize != null;
+		return !this.values.isEmpty() || !this.flags.isEmpty() || this.cursorBatchSize != null || this.allowDiskUse != null;
 	}
 
 	/**
@@ -247,27 +268,6 @@ public class Meta {
 		return ObjectUtils.nullSafeEquals(this.flags, other.flags);
 	}
 
-	/**
-	 * When set to true, aggregation stages can write data to disk.
-	 *
-	 * @return {@literal null} if not set.
-	 * @since 3.0
-	 */
-	@Nullable
-	public Boolean getAllowDiskUse() {
-		return allowDiskUse;
-	}
-
-	/**
-	 * Set to true, to allow aggregation stages to write data to disk.
-	 *
-	 * @param allowDiskUse use {@literal null} for server defaults.
-	 * @since 3.0
-	 */
-	public void setAllowDiskUse(@Nullable Boolean allowDiskUse) {
-		this.allowDiskUse = allowDiskUse;
-	}
-
 	/**
 	 * {@link CursorOption} represents {@code OP_QUERY} wire protocol flags to change the behavior of queries.
 	 *

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/Meta.java

@@ -46,7 +46,7 @@ public @interface Meta {
 	 * Sets the number of documents to return per batch. <br />
 	 * Use {@literal 0 (zero)} for no limit. A <strong>negative limit</strong> closes the cursor after returning a single
 	 * batch indicating to the server that the client will not ask for a subsequent one.
-	 * 
+	 *
 	 * @return {@literal 0 (zero)} by default.
 	 * @since 2.1
 	 */
@@ -68,7 +68,7 @@ public @interface Meta {
 	org.springframework.data.mongodb.core.query.Meta.CursorOption[] flags() default {};
 
 	/**
-	 * When set to true, aggregation stages can write data to disk.
+	 * When set to {@literal true}, aggregation stages can write data to disk.
 	 *
 	 * @return {@literal false} by default.
 	 * @since 3.0

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/AggregationUtils.java

@@ -94,7 +94,7 @@ class AggregationUtils {
 			builder.cursorBatchSize(meta.getCursorBatchSize());
 		}
 
-		if(meta.getMaxTimeMsec() != null && meta.getMaxTimeMsec() > 0) {
+		if (meta.getMaxTimeMsec() != null && meta.getMaxTimeMsec() > 0) {
 			builder.maxTime(Duration.ofMillis(meta.getMaxTimeMsec()));
 		}
 

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/MongoQueryMethod.java

@@ -293,7 +293,7 @@ public class MongoQueryMethod extends QueryMethod {
 			}
 		}
 
-		if(meta.allowDiskUse()) {
+		if (meta.allowDiskUse()) {
 			metaAttributes.setAllowDiskUse(meta.allowDiskUse());
 		}