DATACMNS-697 - TypeDiscoverer now considers field-local generics information.

In case we create a ParameterizedTypeInformation for a property we now also analyze the field-local generics information and add the discovered type mappings to the type variable map.

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

@@ -100,10 +100,21 @@ class TypeDiscoverer<S> implements TypeInformation<S> {
 			return new ClassTypeInformation((Class<?>) fieldType);
 		}
 
-		Map<TypeVariable, Type> variableMap = GenericTypeResolver.getTypeVariableMap(resolveType(fieldType));
+		Class<S> resolveType = resolveType(fieldType);
+		Map<TypeVariable, Type> variableMap = new HashMap<TypeVariable, Type>();
+		variableMap.putAll(GenericTypeResolver.getTypeVariableMap(resolveType));
 
 		if (fieldType instanceof ParameterizedType) {
+
 			ParameterizedType parameterizedType = (ParameterizedType) fieldType;
+
+			TypeVariable<Class<S>>[] typeParameters = resolveType.getTypeParameters();
+			Type[] arguments = parameterizedType.getActualTypeArguments();
+
+			for (int i = 0; i < typeParameters.length; i++) {
+				variableMap.put(typeParameters[i], arguments[i]);
+			}
+
 			return new ParameterizedTypeInformation(parameterizedType, this, variableMap);
 		}
 

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2014 the original author or authors.
+ * Copyright 2011-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,6 +25,7 @@ import java.lang.reflect.Type;
 import java.lang.reflect.TypeVariable;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 
@@ -125,6 +126,17 @@ public class ParameterizedTypeUnitTests {
 		assertThat(type.getActualType(), is(type));
 	}
 
+	/**
+	 * @see DATACMNS-697
+	 */
+	@Test
+	public void usesLocalGenericInformationOfFields() {
+
+		TypeInformation<NormalizedProfile> information = ClassTypeInformation.from(NormalizedProfile.class);
+		TypeInformation<?> valueType = information.getProperty("education2.data").getComponentType();
+		assertThat(valueType.getProperty("value").getType(), is(typeCompatibleWith(Education.class)));
+	}
+
 	@SuppressWarnings("serial")
 	class Localized<S> extends HashMap<Locale, S> {
 		S value;
@@ -151,4 +163,21 @@ public class ParameterizedTypeUnitTests {
 	class Second {
 		Parameterized<String> property;
 	}
+
+	// see DATACMNS-697
+
+	class NormalizedProfile {
+
+		ListField<Education> education2;
+	}
+
+	class ListField<L> {
+		List<Value<L>> data;
+	}
+
+	class Value<T> {
+		T value;
+	}
+
+	class Education {}
 }