Added Lazy wrapper for ReturnType#isDto.

Closes #3160

src/main/java/org/springframework/data/repository/query/ReturnedType.java

@@ -29,6 +29,7 @@
 import org.springframework.data.mapping.model.PreferredConstructorDiscoverer;
 import org.springframework.data.projection.ProjectionFactory;
 import org.springframework.data.projection.ProjectionInformation;
+import org.springframework.data.util.Lazy;
 import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
@@ -219,12 +220,14 @@ public List<String> getInputProperties() {
  * A {@link ReturnedType} that's backed by an actual class.
  *
  * @author Oliver Gierke
+ * @author Mikhail Polivakha
  * @since 1.12
  */
  private static final class ReturnedClass extends ReturnedType {
 
  private static final Set<Class<?>> VOID_TYPES = new HashSet<>(Arrays.asList(Void.class, void.class));
 
+ private final Lazy<Boolean> isDto;
  private final Class<?> type;
  private final List<String> inputProperties;
 
@@ -243,6 +246,15 @@ public ReturnedClass(Class<?> returnedType, Class<?> domainType) {
  Assert.isTrue(!returnedType.isInterface(), "Returned type must not be an interface");
 
  this.type = returnedType;
+ this.isDto = Lazy.of(() ->
+ !Object.class.equals(type) && //
+ !type.isEnum() && //
+ !isDomainSubtype() && //
+ !isPrimitiveOrWrapper() && //
+ !Number.class.isAssignableFrom(type) && //
+ !VOID_TYPES.contains(type) && //
+ !type.getPackage().getName().startsWith("java.")
+ );
  this.inputProperties = detectConstructorParameterNames(returnedType);
  }
 
@@ -294,13 +306,7 @@ private List<String> detectConstructorParameterNames(Class<?> type) {
  }
 
  private boolean isDto() {
- return !Object.class.equals(type) && //
- !type.isEnum() && //
- !isDomainSubtype() && //
- !isPrimitiveOrWrapper() && //
- !Number.class.isAssignableFrom(type) && //
- !VOID_TYPES.contains(type) && //
- !type.getPackage().getName().startsWith("java.");
+ return isDto.get();
  }
 
  private boolean isDomainSubtype() {