Add support for @Value annotation

This commit adds support for `@Value` from project Lombok for metadata
generation. This is very similar to the existing `@Data` support.

See gh-26337

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

@@ -36,6 +36,8 @@ class LombokPropertyDescriptor extends PropertyDescriptor<VariableElement> {
 
 	private static final String LOMBOK_DATA_ANNOTATION = "lombok.Data";
 
+	private static final String LOMBOK_VALUE_ANNOTATION = "lombok.Value";
+
 	private static final String LOMBOK_GETTER_ANNOTATION = "lombok.Getter";
 
 	private static final String LOMBOK_SETTER_ANNOTATION = "lombok.Setter";
@@ -100,7 +102,11 @@ class LombokPropertyDescriptor extends PropertyDescriptor<VariableElement> {
 		if (lombokMethodAnnotationOnElement != null) {
 			return isAccessLevelPublic(env, lombokMethodAnnotationOnElement);
 		}
-		return (env.getAnnotation(getOwnerElement(), LOMBOK_DATA_ANNOTATION) != null);
+		return (hasAnnotation(env, LOMBOK_DATA_ANNOTATION) || hasAnnotation(env, LOMBOK_VALUE_ANNOTATION));
+	}
+
+	private boolean hasAnnotation(MetadataGenerationEnvironment env, String lombokAnnotation) {
+		return (env.getAnnotation(getOwnerElement(), lombokAnnotation) != null);
 	}
 
 	private boolean isAccessLevelPublic(MetadataGenerationEnvironment env, AnnotationMirror lombokAnnotation) {

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

@@ -29,6 +29,7 @@ import org.springframework.boot.configurationsample.lombok.LombokInnerClassPrope
 import org.springframework.boot.configurationsample.lombok.LombokInnerClassWithGetterProperties;
 import org.springframework.boot.configurationsample.lombok.LombokSimpleDataProperties;
 import org.springframework.boot.configurationsample.lombok.LombokSimpleProperties;
+import org.springframework.boot.configurationsample.lombok.LombokSimpleValueProperties;
 import org.springframework.boot.configurationsample.lombok.SimpleLombokPojo;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -46,6 +47,12 @@ class LombokMetadataGenerationTests extends AbstractMetadataGenerationTests {
 		assertSimpleLombokProperties(metadata, LombokSimpleDataProperties.class, "data");
 	}
 
+	@Test
+	void lombokValueProperties() {
+		ConfigurationMetadata metadata = compile(LombokSimpleValueProperties.class);
+		assertSimpleLombokProperties(metadata, LombokSimpleValueProperties.class, "value");
+	}
+
 	@Test
 	void lombokSimpleProperties() {
 		ConfigurationMetadata metadata = compile(LombokSimpleProperties.class);

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

@@ -30,6 +30,7 @@ import org.springframework.boot.configurationsample.lombok.LombokExplicitPropert
 import org.springframework.boot.configurationsample.lombok.LombokInnerClassProperties;
 import org.springframework.boot.configurationsample.lombok.LombokSimpleDataProperties;
 import org.springframework.boot.configurationsample.lombok.LombokSimpleProperties;
+import org.springframework.boot.configurationsample.lombok.LombokSimpleValueProperties;
 import org.springframework.boot.configurationsample.simple.SimpleProperties;
 import org.springframework.boot.configurationsample.specific.InnerClassProperties;
 
@@ -114,6 +115,16 @@ class LombokPropertyDescriptorTests extends PropertyDescriptorTests {
 		});
 	}
 
+	@Test
+	void lombokSimplePropertyWithOnlyGetterOnValueClassShouldNotBeExposed() throws IOException {
+		process(LombokSimpleValueProperties.class, (roundEnv, metadataEnv) -> {
+			TypeElement ownerElement = roundEnv.getRootElement(LombokSimpleValueProperties.class);
+			LombokPropertyDescriptor property = createPropertyDescriptor(ownerElement, "ignored");
+			assertThat(property.isProperty(metadataEnv)).isFalse();
+			assertThat(property.isNested(metadataEnv)).isFalse();
+		});
+	}
+
 	@Test
 	void lombokSimplePropertyWithOnlyGetterOnFieldShouldNotBeExposed() throws IOException {
 		process(LombokExplicitProperties.class, (roundEnv, metadataEnv) -> {

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

@@ -41,6 +41,7 @@ import org.springframework.boot.configurationsample.immutable.ImmutableSimplePro
 import org.springframework.boot.configurationsample.lombok.LombokExplicitProperties;
 import org.springframework.boot.configurationsample.lombok.LombokSimpleDataProperties;
 import org.springframework.boot.configurationsample.lombok.LombokSimpleProperties;
+import org.springframework.boot.configurationsample.lombok.LombokSimpleValueProperties;
 import org.springframework.boot.configurationsample.simple.HierarchicalProperties;
 import org.springframework.boot.configurationsample.simple.HierarchicalPropertiesGrandparent;
 import org.springframework.boot.configurationsample.simple.HierarchicalPropertiesParent;
@@ -104,6 +105,12 @@ class PropertyDescriptorResolverTests {
 				(stream) -> assertThat(stream).containsExactly("name", "description", "counter", "number", "items")));
 	}
 
+	@Test
+	void propertiesWithLombokValueClass() throws IOException {
+		process(LombokSimpleValueProperties.class, propertyNames(
+				(stream) -> assertThat(stream).containsExactly("name", "description", "counter", "number", "items")));
+	}
+
 	@Test
 	void propertiesWithConstructorWithConstructorBinding() throws IOException {
 		process(ImmutableSimpleProperties.class, propertyNames(

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/lombok/LombokSimpleValueProperties.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2012-2019 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
+ *
+ *      https://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.lombok;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import lombok.Value;
+
+import org.springframework.boot.configurationsample.ConfigurationProperties;
+
+/**
+ * Configuration properties using lombok @Value.
+ *
+ * @author Mark Jeffrey
+ */
+@Value
+@ConfigurationProperties(prefix = "value")
+@SuppressWarnings("unused")
+public class LombokSimpleValueProperties {
+
+	private final String id = "super-id";
+
+	/**
+	 * Name description.
+	 */
+	private String name;
+
+	private String description;
+
+	private Integer counter;
+
+	@Deprecated
+	private Integer number = 0;
+
+	private final List<String> items = new ArrayList<>();
+
+	private final String ignored = "foo";
+
+}