Generate auto-configuration OnWebApplication data

Update the auto-configuration annotation processor to generate
properties for `@OnWebApplication`.

See gh-13328

Author: philwebb

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/main/java/org/springframework/boot/autoconfigureprocessor/AutoConfigureAnnotationProcessor.java

@@ -53,6 +53,7 @@
 		"org.springframework.boot.autoconfigure.condition.ConditionalOnClass",
 		"org.springframework.boot.autoconfigure.condition.ConditionalOnBean",
 		"org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate",
+		"org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication",
 		"org.springframework.boot.autoconfigure.AutoConfigureBefore",
 		"org.springframework.boot.autoconfigure.AutoConfigureAfter",
 		"org.springframework.boot.autoconfigure.AutoConfigureOrder" })
@@ -85,6 +86,8 @@ protected void addAnnotations(Map<String, String> annotations) {
 				"org.springframework.boot.autoconfigure.condition.ConditionalOnBean");
 		annotations.put("ConditionalOnSingleCandidate",
 				"org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate");
+		annotations.put("ConditionalOnWebApplication",
+				"org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication");
 		annotations.put("AutoConfigureBefore",
 				"org.springframework.boot.autoconfigure.AutoConfigureBefore");
 		annotations.put("AutoConfigureAfter",
@@ -99,6 +102,7 @@ private void addValueExtractors(Map<String, ValueExtractor> attributes) {
 		attributes.put("ConditionalOnBean", new OnBeanConditionValueExtractor());
 		attributes.put("ConditionalOnSingleCandidate",
 				new OnBeanConditionValueExtractor());
+		attributes.put("ConditionalOnWebApplication", ValueExtractor.allFrom("type"));
 		attributes.put("AutoConfigureBefore", ValueExtractor.allFrom("value", "name"));
 		attributes.put("AutoConfigureAfter", ValueExtractor.allFrom("value", "name"));
 		attributes.put("AutoConfigureOrder", ValueExtractor.allFrom("value"));

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/AutoConfigureAnnotationProcessorTests.java

@@ -50,7 +50,7 @@ public void createCompiler() throws IOException {
 	@Test
 	public void annotatedClass() throws Exception {
 		Properties properties = compile(TestClassConfiguration.class);
-		assertThat(properties).hasSize(5);
+		assertThat(properties).hasSize(6);
 		assertThat(properties).containsEntry(
 				"org.springframework.boot.autoconfigureprocessor."
 						+ "TestClassConfiguration.ConditionalOnClass",
@@ -73,6 +73,10 @@ public void annotatedClass() throws Exception {
 				"org.springframework.boot.autoconfigureprocessor."
 						+ "TestClassConfiguration.ConditionalOnSingleCandidate",
 				"java.io.OutputStream");
+		assertThat(properties).containsEntry(
+				"org.springframework.boot.autoconfigureprocessor."
+						+ "TestClassConfiguration.ConditionalOnWebApplication",
+				"SERVLET");
 	}
 
 	@Test
@@ -124,7 +128,7 @@ public void annotatedClassWithOrder() throws Exception {
 	}
 
 	private Properties compile(Class<?>... types) throws IOException {
-		TestConditionMetadataAnnotationProcessor processor = new TestConditionMetadataAnnotationProcessor(
+		TestAutoConfigureAnnotationProcessor processor = new TestAutoConfigureAnnotationProcessor(
 				this.compiler.getOutputLocation());
 		this.compiler.getTask(types).call(processor);
 		return processor.getWrittenProperties();

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestConditionMetadataAnnotationProcessor.java renamed to spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestAutoConfigureAnnotationProcessor.java

@@ -34,15 +34,16 @@
 		"org.springframework.boot.autoconfigureprocessor.TestConditionalOnClass",
 		"org.springframework.boot.autoconfigure.condition.TestConditionalOnBean",
 		"org.springframework.boot.autoconfigure.condition.TestConditionalOnSingleCandidate",
+		"org.springframework.boot.autoconfigure.condition.TestConditionalOnWebApplication",
 		"org.springframework.boot.autoconfigureprocessor.TestAutoConfigureBefore",
 		"org.springframework.boot.autoconfigureprocessor.TestAutoConfigureAfter",
 		"org.springframework.boot.autoconfigureprocessor.TestAutoConfigureOrder" })
-public class TestConditionMetadataAnnotationProcessor
+public class TestAutoConfigureAnnotationProcessor
 		extends AutoConfigureAnnotationProcessor {
 
 	private final File outputLocation;
 
-	public TestConditionMetadataAnnotationProcessor(File outputLocation) {
+	public TestAutoConfigureAnnotationProcessor(File outputLocation) {
 		this.outputLocation = outputLocation;
 	}
 
@@ -53,6 +54,8 @@ protected void addAnnotations(Map<String, String> annotations) {
 		put(annotations, "ConditionalOnBean", TestConditionalOnBean.class);
 		put(annotations, "ConditionalOnSingleCandidate",
 				TestConditionalOnSingleCandidate.class);
+		put(annotations, "ConditionalOnWebApplication",
+				TestConditionalOnWebApplication.class);
 		put(annotations, "AutoConfigureBefore", TestAutoConfigureBefore.class);
 		put(annotations, "AutoConfigureAfter", TestAutoConfigureAfter.class);
 		put(annotations, "AutoConfigureOrder", TestAutoConfigureOrder.class);

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestClassConfiguration.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.autoconfigureprocessor;
 
+import org.springframework.boot.autoconfigureprocessor.TestConditionalOnWebApplication.Type;
+
 /**
  * Test configuration with an annotated class.
  *
@@ -25,6 +27,7 @@
 @TestConditionalOnClass(name = "java.io.InputStream", value = TestClassConfiguration.Nested.class)
 @TestConditionalOnBean(type = "java.io.OutputStream")
 @TestConditionalOnSingleCandidate(type = "java.io.OutputStream")
+@TestConditionalOnWebApplication(type = Type.SERVLET)
 public class TestClassConfiguration {
 
 	@TestAutoConfigureOrder

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestConditionalOnWebApplication.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2012-2018 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.autoconfigureprocessor;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Alternative to Spring Boot's {@code @ConditionalOnWebApplication} for testing (removes
+ * the need for a dependency on the real annotation).
+ *
+ * @author Phillip Webb
+ */
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+public @interface TestConditionalOnWebApplication {
+
+	Type type() default Type.ANY;
+
+	enum Type {
+
+		ANY, SERVLET, REACTIVE
+
+	}
+
+}