DATACMNS-1419 - Added TypeInformation.isSubtypeOf(…).

src/main/java/org/springframework/data/util/TypeInformation.java

@@ -262,4 +262,15 @@ public interface TypeInformation<S> {
 	 * @return will never be {@literal null}.
 	 */
 	TypeInformation<? extends S> specialize(ClassTypeInformation<?> type);
+
+	/**
+	 * Returns whether the current type is a sub type of the given one, i.e. whether it's assignable but not the same one.
+	 * 
+	 * @param type must not be {@literal null}.
+	 * @return
+	 * @since 2.2
+	 */
+	default boolean isSubTypeOf(Class<?> type) {
+		return !type.equals(getType()) && type.isAssignableFrom(getType());
+	}
 }

src/test/java/org/springframework/data/util/TypeDiscovererUnitTests.java

@@ -27,6 +27,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Set;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -168,6 +169,16 @@ public class TypeDiscovererUnitTests {
 		assertThat(type.getRequiredProperty("streamable").isCollectionLike()).isTrue();
 	}
 
+	@Test // DATACMNS-1419
+	public void detectsSubTypes() {
+
+		ClassTypeInformation<Set> type = from(Set.class);
+
+		assertThat(type.isSubTypeOf(Collection.class)).isTrue();
+		assertThat(type.isSubTypeOf(Set.class)).isFalse();
+		assertThat(type.isSubTypeOf(String.class)).isFalse();
+	}
+
 	class Person {
 
 		Addresses addresses;