Merge branch '3.5.x'

Closes gh-47034

Author: wilkinsona

buildSrc/src/main/java/org/springframework/boot/build/autoconfigure/DocumentAutoConfigurationClasses.java

@@ -40,6 +40,7 @@
 import org.gradle.api.tasks.PathSensitivity;
 import org.gradle.api.tasks.TaskAction;
 
+import org.springframework.util.FileSystemUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -66,6 +67,7 @@ public void setAutoConfiguration(FileCollection autoConfiguration) {
 
 	@TaskAction
 	void documentAutoConfigurationClasses() throws IOException {
+		FileSystemUtils.deleteRecursively(getOutputDir().getAsFile().get());
 		List<AutoConfiguration> autoConfigurations = load();
 		autoConfigurations.forEach(this::writeModuleAdoc);
 		for (File metadataFile : this.autoConfiguration) {

buildSrc/src/test/java/org/springframework/boot/build/autoconfigure/DocumentAutoConfigurationClassesTests.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2012-present 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.build.autoconfigure;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.List;
+import java.util.Properties;
+import java.util.function.Consumer;
+import java.util.stream.Stream;
+
+import org.gradle.api.Project;
+import org.gradle.api.file.ConfigurableFileCollection;
+import org.gradle.testfixtures.ProjectBuilder;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link DocumentAutoConfigurationClasses}.
+ *
+ * @author Andy Wilkinson
+ */
+class DocumentAutoConfigurationClassesTests {
+
+	@TempDir
+	private File temp;
+
+	@Test
+	void classesAreDocumented() throws IOException {
+		File output = documentAutoConfigurationClasses((metadataDir) -> {
+			writeAutoConfigurationMetadata("spring-boot-one", List.of("org.springframework.boot.one.AAutoConfiguration",
+					"org.springframework.boot.one.BAutoConfiguration"), metadataDir);
+			writeAutoConfigurationMetadata("spring-boot-two", List.of("org.springframework.boot.two.CAutoConfiguration",
+					"org.springframework.boot.two.DAutoConfiguration"), metadataDir);
+		});
+		assertThat(output).isNotEmptyDirectory();
+		assertThat(output.listFiles()).extracting(File::getName)
+			.containsExactlyInAnyOrder("spring-boot-one.adoc", "spring-boot-two.adoc", "nav.adoc");
+	}
+
+	@Test
+	void whenMetadataIsRemovedThenOutputForThatMetadataIsNoLongerPresent() throws IOException {
+		documentAutoConfigurationClasses((metadataDir) -> {
+			writeAutoConfigurationMetadata("spring-boot-one", List.of("org.springframework.boot.one.AAutoConfiguration",
+					"org.springframework.boot.one.BAutoConfiguration"), metadataDir);
+			writeAutoConfigurationMetadata("spring-boot-two", List.of("org.springframework.boot.two.CAutoConfiguration",
+					"org.springframework.boot.two.DAutoConfiguration"), metadataDir);
+		});
+		File output = documentAutoConfigurationClasses(
+				(metadataDir) -> assertThat(new File(metadataDir, "spring-boot-two.properties").delete()).isTrue());
+		assertThat(output).isNotEmptyDirectory();
+		assertThat(output.listFiles()).extracting(File::getName)
+			.containsExactlyInAnyOrder("spring-boot-one.adoc", "nav.adoc");
+	}
+
+	private File documentAutoConfigurationClasses(Consumer<File> metadataDir) throws IOException {
+		Project project = ProjectBuilder.builder().build();
+		DocumentAutoConfigurationClasses task = project.getTasks()
+			.register("documentAutoConfigurationClasses", DocumentAutoConfigurationClasses.class)
+			.get();
+		File output = new File(this.temp, "output");
+		File input = new File(this.temp, "input");
+		input.mkdirs();
+		metadataDir.accept(input);
+		ConfigurableFileCollection autoConfiguration = project.files();
+		Stream.of(input.listFiles()).forEach(autoConfiguration::from);
+		task.getOutputDir().set(output);
+		task.setAutoConfiguration(autoConfiguration);
+		task.documentAutoConfigurationClasses();
+		return output;
+	}
+
+	private void writeAutoConfigurationMetadata(String module, List<String> classes, File outputDir) {
+		File metadata = new File(outputDir, module + ".properties");
+		Properties properties = new Properties();
+		properties.setProperty("autoConfigurationClassNames", String.join(",", classes));
+		properties.setProperty("module", module);
+		try (FileOutputStream out = new FileOutputStream(metadata)) {
+			properties.store(out, null);
+		}
+		catch (IOException ex) {
+			throw new java.io.UncheckedIOException(ex);
+		}
+	}
+
+}