DATAJPA-965 - Polishing.

Removed some unnecessary overrides in JpaOrder.

src/main/java/org/springframework/data/jpa/domain/JpaSort.java

@@ -241,6 +241,7 @@ public class JpaSort extends Sort {
 		Assert.notEmpty(properties, "Properties must not be empty!");
 
 		List<Order> orders = new ArrayList<Order>();
+
 		for (String property : properties) {
 			orders.add(new JpaOrder(direction, property));
 		}
@@ -309,10 +310,17 @@ public class JpaSort extends Sort {
 	}
 
 	/**
+	 * Custom {@link Order} that keeps a flag to indicate unsafe property handling, i.e. the String provided is not
+	 * necessarily a property but can be an arbitrary expression piped into the query execution. We also keep an
+	 * additional {@code ignoreCase} flag around as the constructor of the superclass is private currently.
+	 * 
 	 * @author Christoph Strobl
+	 * @author Oliver Gierke
 	 */
 	public static class JpaOrder extends Order {
 
+		private static final long serialVersionUID = 1L;
+
 		private final boolean unsafe;
 		private final boolean ignoreCase;
 
@@ -365,32 +373,6 @@ public class JpaSort extends Sort {
 			return new JpaOrder(getDirection(), getProperty(), nullHandling, isIgnoreCase(), this.unsafe);
 		}
 
-		/*
-		 * (non-Javadoc)
-		 * @see org.springframework.data.domain.Sort.Order#nullsFirst()
-		 */
-		@Override
-		public JpaOrder nullsFirst() {
-			return with(NullHandling.NULLS_FIRST);
-		}
-
-		/*
-		 * (non-Javadoc)
-		 * @see org.springframework.data.domain.Sort.Order#nullsLast()
-		 */
-		@Override
-		public JpaOrder nullsLast() {
-			return with(NullHandling.NULLS_LAST);
-		}
-
-		/*
-		 * (non-Javadoc)
-		 * @see org.springframework.data.domain.Sort.Order#nullsNative()
-		 */
-		public JpaOrder nullsNative() {
-			return with(NullHandling.NATIVE);
-		}
-
 		/**
 		 * Creates new {@link Sort} with potentially unsafe {@link Order} instances.
 		 *
@@ -403,9 +385,11 @@ public class JpaSort extends Sort {
 			Assert.noNullElements(properties, "Properties must not contain null values!");
 
 			List<Order> orders = new ArrayList<Order>();
+
 			for (String property : properties) {
 				orders.add(new JpaOrder(getDirection(), property, getNullHandling(), isIgnoreCase(), this.unsafe));
 			}
+
 			return new Sort(orders);
 		}
 

src/main/java/org/springframework/data/jpa/repository/query/QueryUtils.java

@@ -75,7 +75,6 @@ public abstract class QueryUtils {
 	public static final String COUNT_QUERY_STRING = "select count(%s) from %s x";
 	public static final String DELETE_ALL_QUERY_STRING = "delete from %s x";
 
-	private static final String DEFAULT_ALIAS = "x";
 	private static final String COUNT_REPLACEMENT_TEMPLATE = "select count(%s) $5$6$7";
 	private static final String SIMPLE_COUNT_VALUE = "$2";
 	private static final String COMPLEX_COUNT_VALUE = "$3$6";
@@ -106,6 +105,10 @@ public abstract class QueryUtils {
 	private static final String FUNCTION_ALIAS_GROUP_NAME = "alias";
 	private static final Pattern FUNCTION_PATTERN;
 
+	private static final String UNSAFE_PROPERTY_REFERENCE = "Sort expression '%s' must only contain property references or "
+			+ "aliases used in the select clause. If you really want to use something other than that for sorting, please use "
+			+ "JpaSort.unsafe(…)!";
+
 	static {
 
 		StringBuilder builder = new StringBuilder();
@@ -298,7 +301,7 @@ public abstract class QueryUtils {
 	 * @param query
 	 * @return
 	 */
-	static Set<String> getFunctionAliases(String query) {
+	private static Set<String> getFunctionAliases(String query) {
 
 		Set<String> result = new HashSet<String>();
 		Matcher matcher = FUNCTION_PATTERN.matcher(query);
@@ -306,6 +309,7 @@ public abstract class QueryUtils {
 		while (matcher.find()) {
 
 			String alias = matcher.group(FUNCTION_ALIAS_GROUP_NAME);
+
 			if (StringUtils.hasText(alias)) {
 				result.add(alias);
 			}
@@ -629,8 +633,7 @@ public abstract class QueryUtils {
 		}
 
 		if (PUNCTATION_PATTERN.matcher(order.getProperty()).find()) {
-			throw new InvalidDataAccessApiUsageException(String
-					.format("Sort expression '%s' must not contain functions or expressions. Please use JpaSort.unsafe.", order));
+			throw new InvalidDataAccessApiUsageException(String.format(UNSAFE_PROPERTY_REFERENCE, order));
 		}
 	}
 }

src/test/java/org/springframework/data/jpa/repository/query/QueryUtilsUnitTests.java

@@ -48,9 +48,7 @@ public class QueryUtilsUnitTests {
 
 	@Test
 	public void createsCountQueryCorrectly() throws Exception {
-
 		assertCountQuery(QUERY, COUNT_QUERY);
-
 	}
 
 	/**