Fix class name in generated meta-data

Previously, the algorithm that computes the String representation of a
class reference and a property type was shared. This lead to generic
information for group's `type` and `sourceType` property.

This commit separates that logic in two: `getQualifiedName` is now
responsible to generate a fully qualified class name while the existing
`getType` is solely responsible to generate a type representation for the
property. Only the latter has generic information.

Closes gh-7236

spring-boot-docs/src/main/asciidoc/appendix-configuration-metadata.adoc

@@ -164,12 +164,13 @@ The JSON object contained in the `properties` array can contain the following at
 
 |`type`
 | String
-| The class name of the data type of the property. For example, `java.lang.String`. This
-  attribute can be used to guide the user as to the types of values that they can enter.
-  For consistency, the type of a primitive is specified using its wrapper counterpart,
-  i.e. `boolean` becomes `java.lang.Boolean`. Note that this class may be a complex type
-  that gets converted from a String as values are bound. May be omitted if the type is
-  not known.
+| The full signature of the data type of the property. For example, `java.lang.String`
+  but also a full generic type such as `java.util.Map<java.util.String,acme.MyEnum>`.
+  This attribute can be used to guide the user as to the types of values that they can
+  enter. For consistency, the type of a primitive is specified using its wrapper
+  counterpart, i.e. `boolean` becomes `java.lang.Boolean`. Note that this class may be
+  a complex type that gets converted from a String as values are bound. May be omitted
+  if the type is not known.
 
 |`description`
 | String

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessor.java

@@ -161,7 +161,7 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 	}
 
 	private void processAnnotatedTypeElement(String prefix, TypeElement element) {
-		String type = this.typeUtils.getType(element);
+		String type = this.typeUtils.getQualifiedName(element);
 		this.metadataCollector.add(ItemMetadata.newGroup(prefix, type, type, null));
 		processTypeElement(prefix, element);
 	}
@@ -173,8 +173,9 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 					.asElement(element.getReturnType());
 			if (returns instanceof TypeElement) {
 				this.metadataCollector.add(
-						ItemMetadata.newGroup(prefix, this.typeUtils.getType(returns),
-								this.typeUtils.getType(element.getEnclosingElement()),
+						ItemMetadata.newGroup(prefix,
+								this.typeUtils.getQualifiedName(returns),
+								this.typeUtils.getQualifiedName(element.getEnclosingElement()),
 								element.toString()));
 				processTypeElement(prefix, (TypeElement) returns);
 			}
@@ -215,7 +216,7 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 			boolean isCollection = this.typeUtils.isCollectionOrMap(returnType);
 			if (!isExcluded && !isNested && (setter != null || isCollection)) {
 				String dataType = this.typeUtils.getType(returnType);
-				String sourceType = this.typeUtils.getType(element);
+				String sourceType = this.typeUtils.getQualifiedName(element);
 				String description = this.typeUtils.getJavaDoc(field);
 				Object defaultValue = fieldValues.get(name);
 				boolean deprecated = isDeprecated(getter) || isDeprecated(setter)
@@ -258,7 +259,7 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 			boolean hasSetter = hasLombokSetter(field, element);
 			if (!isExcluded && !isNested && (hasSetter || isCollection)) {
 				String dataType = this.typeUtils.getType(returnType);
-				String sourceType = this.typeUtils.getType(element);
+				String sourceType = this.typeUtils.getQualifiedName(element);
 				String description = this.typeUtils.getJavaDoc(field);
 				Object defaultValue = fieldValues.get(name);
 				boolean deprecated = isDeprecated(field) || isDeprecated(element);
@@ -315,8 +316,8 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 				&& annotation == null && isNested) {
 			String nestedPrefix = ConfigurationMetadata.nestedPrefix(prefix, name);
 			this.metadataCollector.add(ItemMetadata.newGroup(nestedPrefix,
-					this.typeUtils.getType(returnElement),
-					this.typeUtils.getType(element),
+					this.typeUtils.getQualifiedName(returnElement),
+					this.typeUtils.getQualifiedName(element),
 					(getter == null ? null : getter.toString())));
 			processTypeElement(nestedPrefix, (TypeElement) returnElement);
 		}

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/MetadataCollector.java

@@ -69,7 +69,7 @@ public class MetadataCollector {
 
 	private void markAsProcessed(Element element) {
 		if (element instanceof TypeElement) {
-			this.processedSourceTypes.add(this.typeUtils.getType(element));
+			this.processedSourceTypes.add(this.typeUtils.getQualifiedName(element));
 		}
 	}
 

spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/TypeUtils.java

@@ -93,10 +93,34 @@ class TypeUtils {
 		}
 	}
 
-	public String getType(Element element) {
-		return getType(element == null ? null : element.asType());
+	/**
+	 * Return the qualified name of the specified element.
+	 * @param element the element to handle
+	 * @return the fully qualified name of the element, suitable for a call
+	 * to {@link Class#forName(String)}
+	 */
+	public String getQualifiedName(Element element) {
+		if (element == null) {
+			return null;
+		}
+		TypeElement enclosingElement = getEnclosingTypeElement(element.asType());
+		if (enclosingElement != null) {
+			return getQualifiedName(enclosingElement) + "$"
+					+ ((DeclaredType) element.asType()).asElement().getSimpleName().toString();
+		}
+		if (element instanceof TypeElement) {
+			return ((TypeElement) element).getQualifiedName().toString();
+		}
+		throw new IllegalStateException("Could not extract qualified name from "
+				+ element);
 	}
 
+	/**
+	 * Return the type of the specified {@link TypeMirror} including all its generic
+	 * information.
+	 * @param type  the type to handle
+	 * @return a representation of the type including all its generic information
+	 */
 	public String getType(TypeMirror type) {
 		if (type == null) {
 			return null;
@@ -105,15 +129,23 @@ class TypeUtils {
 		if (wrapper != null) {
 			return wrapper.getName();
 		}
+		TypeElement enclosingElement = getEnclosingTypeElement(type);
+		if (enclosingElement != null) {
+			return getQualifiedName(enclosingElement) + "$"
+					+ ((DeclaredType) type).asElement().getSimpleName().toString();
+		}
+		return type.toString();
+	}
+
+	private TypeElement getEnclosingTypeElement(TypeMirror type) {
 		if (type instanceof DeclaredType) {
 			DeclaredType declaredType = (DeclaredType) type;
 			Element enclosingElement = declaredType.asElement().getEnclosingElement();
 			if (enclosingElement != null && enclosingElement instanceof TypeElement) {
-				return getType(enclosingElement) + "$"
-						+ declaredType.asElement().getSimpleName().toString();
+				return (TypeElement) enclosingElement;
 			}
 		}
-		return type.toString();
+		return null;
 	}
 
 	public boolean isCollectionOrMap(TypeMirror type) {

spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java

@@ -57,6 +57,7 @@ import org.springframework.boot.configurationsample.specific.BoxingPojo;
 import org.springframework.boot.configurationsample.specific.BuilderPojo;
 import org.springframework.boot.configurationsample.specific.DeprecatedUnrelatedMethodPojo;
 import org.springframework.boot.configurationsample.specific.ExcludedTypesPojo;
+import org.springframework.boot.configurationsample.specific.GenericConfig;
 import org.springframework.boot.configurationsample.specific.InnerClassAnnotatedGetterConfig;
 import org.springframework.boot.configurationsample.specific.InnerClassProperties;
 import org.springframework.boot.configurationsample.specific.InnerClassRootConfig;
@@ -339,6 +340,35 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 		assertThat(metadata.getItems(), hasSize(1));
 	}
 
+	@Test
+	public void genericTypes() throws IOException {
+		ConfigurationMetadata metadata = compile(GenericConfig.class);
+		assertThat(metadata, containsGroup("generic").ofType(
+				"org.springframework.boot.configurationsample.specific.GenericConfig"));
+		assertThat(metadata, containsGroup("generic.foo").ofType(
+				"org.springframework.boot.configurationsample.specific.GenericConfig$Foo"));
+		assertThat(metadata, containsGroup("generic.foo.bar").ofType(
+				"org.springframework.boot.configurationsample.specific.GenericConfig$Bar"));
+		assertThat(metadata, containsGroup("generic.foo.bar.biz").ofType(
+				"org.springframework.boot.configurationsample.specific.GenericConfig$Bar$Biz"));
+		assertThat(metadata, containsProperty("generic.foo.name")
+				.ofType(String.class)
+				.fromSource(GenericConfig.Foo.class));
+		assertThat(metadata, containsProperty("generic.foo.string-to-bar")
+				.ofType("java.util.Map<java.lang.String,org.springframework.boot.configurationsample.specific.GenericConfig.Bar<java.lang.Integer>>")
+				.fromSource(GenericConfig.Foo.class));
+		assertThat(metadata, containsProperty("generic.foo.string-to-integer")
+				.ofType("java.util.Map<java.lang.String,java.lang.Integer>")
+				.fromSource(GenericConfig.Foo.class));
+		assertThat(metadata, containsProperty("generic.foo.bar.name")
+				.ofType("java.lang.String")
+				.fromSource(GenericConfig.Bar.class));
+		assertThat(metadata, containsProperty("generic.foo.bar.biz.name")
+				.ofType("java.lang.String")
+				.fromSource(GenericConfig.Bar.Biz.class));
+		assertThat(metadata.getItems(), hasSize(9));
+	}
+
 	@Test
 	public void lombokDataProperties() throws Exception {
 		ConfigurationMetadata metadata = compile(LombokSimpleDataProperties.class);

spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/specific/GenericConfig.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright 2012-2016 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.configurationsample.specific;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.boot.configurationsample.ConfigurationProperties;
+import org.springframework.boot.configurationsample.NestedConfigurationProperty;
+
+/**
+ * Demonstrate that only relevant generics are stored in the metadata.
+ *
+ * @author Stephane Nicoll
+ */
+@ConfigurationProperties("generic")
+public class GenericConfig<T> {
+
+	private final Foo foo = new Foo();
+
+	public Foo getFoo() {
+		return this.foo;
+	}
+
+	public static class Foo {
+
+		private String name;
+
+		@NestedConfigurationProperty
+		private final Bar<String> bar = new Bar<String>();
+
+		private final Map<String, Bar<Integer>> stringToBar =
+				new HashMap<String, Bar<Integer>>();
+
+		private final Map<String, Integer> stringToInteger =
+				new HashMap<String, Integer>();
+
+		public String getName() {
+			return this.name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Bar<String> getBar() {
+			return this.bar;
+		}
+
+		public Map<String, Bar<Integer>> getStringToBar() {
+			return this.stringToBar;
+		}
+
+		public Map<String, Integer> getStringToInteger() {
+			return this.stringToInteger;
+		}
+	}
+
+	public static class Bar<U> {
+
+		private String name;
+
+		@NestedConfigurationProperty
+		private final Biz<String> biz = new Biz<String>();
+
+		public String getName() {
+			return this.name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Biz<String> getBiz() {
+			return this.biz;
+		}
+
+		public static class Biz<V> {
+
+			private String name;
+
+			public String getName() {
+				return this.name;
+			}
+
+			public void setName(String name) {
+				this.name = name;
+			}
+		}
+
+	}
+
+}