DATAMONGO-2003 - Polishing.

Add nullability annotation to MongoParameterAccessor.getPoint(). Remove superfluous casts.

Convert MongoQueryCreatorUnitTests to user AssertJ assertions.

Original pull request: #570.

Author: mp911de

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

@@ -45,6 +45,7 @@ public interface MongoParameterAccessor extends ParameterAccessor {
 	 *
 	 * @return
 	 */
+	@Nullable
 	Point getGeoNearLocation();
 
 	/**

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

@@ -114,9 +114,8 @@ protected Criteria create(Part part, Iterator<Object> iterator) {
 
 		PersistentPropertyPath<MongoPersistentProperty> path = context.getPersistentPropertyPath(part.getProperty());
 		MongoPersistentProperty property = path.getLeafProperty();
-		Criteria criteria = from(part, property, where(path.toDotPath()), (PotentiallyConvertingIterator) iterator);
 
-		return criteria;
+		return from(part, property, where(path.toDotPath()), iterator);
 	}
 
 	/*
@@ -133,7 +132,7 @@ protected Criteria and(Part part, Criteria base, Iterator<Object> iterator) {
 		PersistentPropertyPath<MongoPersistentProperty> path = context.getPersistentPropertyPath(part.getProperty());
 		MongoPersistentProperty property = path.getLeafProperty();
 
-		return from(part, property, base.and(path.toDotPath()), (PotentiallyConvertingIterator) iterator);
+		return from(part, property, base.and(path.toDotPath()), iterator);
 	}
 
 	/*