Refine links in spring-boot-dependencies

Add support for a root name and change `reference` to `docs`.

See gh-39779

buildSrc/src/main/java/org/springframework/boot/build/bom/BomExtension.java

@@ -124,7 +124,7 @@ public void library(String name, String version, Action<LibraryHandler> action)
 				: null;
 		addLibrary(new Library(name, libraryHandler.calendarName, libraryVersion, libraryHandler.groups,
 				libraryHandler.prohibitedVersions, libraryHandler.considerSnapshots, versionAlignment,
-				libraryHandler.links));
+				libraryHandler.linkRootName, libraryHandler.links));
 	}
 
 	public void effectiveBomArtifact() {
@@ -232,6 +232,8 @@ public static class LibraryHandler {
 
 		private AlignWithVersionHandler alignWithVersion;
 
+		private String linkRootName;
+
 		private final Map<String, Function<LibraryVersion, String>> links = new HashMap<>();
 
 		@Inject
@@ -271,8 +273,13 @@ public void alignWithVersion(Action<AlignWithVersionHandler> action) {
 		}
 
 		public void links(Action<LinksHandler> action) {
+			links(null, action);
+		}
+
+		public void links(String linkRootName, Action<LinksHandler> action) {
 			LinksHandler handler = new LinksHandler();
 			action.execute(handler);
+			this.linkRootName = linkRootName;
 			this.links.putAll(handler.links);
 		}
 
@@ -431,20 +438,20 @@ public void github(Function<LibraryVersion, String> linkFactory) {
 			add("github", linkFactory);
 		}
 
-		public void javadoc(String linkTemplate) {
-			javadoc(asFactory(linkTemplate));
+		public void docs(String linkTemplate) {
+			docs(asFactory(linkTemplate));
 		}
 
-		public void javadoc(Function<LibraryVersion, String> linkFactory) {
-			add("javadoc", linkFactory);
+		public void docs(Function<LibraryVersion, String> linkFactory) {
+			add("docs", linkFactory);
 		}
 
-		public void reference(String linkTemplate) {
-			reference(asFactory(linkTemplate));
+		public void javadoc(String linkTemplate) {
+			javadoc(asFactory(linkTemplate));
 		}
 
-		public void reference(Function<LibraryVersion, String> linkFactory) {
-			add("reference", linkFactory);
+		public void javadoc(Function<LibraryVersion, String> linkFactory) {
+			add("javadoc", linkFactory);
 		}
 
 		public void releaseNotes(String linkTemplate) {

buildSrc/src/main/java/org/springframework/boot/build/bom/Library.java

@@ -62,6 +62,8 @@ public class Library {
 
 	private final VersionAlignment versionAlignment;
 
+	private final String linkRootName;
+
 	private final Map<String, Function<LibraryVersion, String>> links;
 
 	/**
@@ -75,11 +77,13 @@ public class Library {
 	 * @param prohibitedVersions version of the library that are prohibited
 	 * @param considerSnapshots whether to consider snapshots
 	 * @param versionAlignment version alignment, if any, for the library
+	 * @param linkRootName the root name to use when generating link variable or
+	 * {@code null} to generate one based on the library {@code name}
 	 * @param links a list of HTTP links relevant to the library
 	 */
 	public Library(String name, String calendarName, LibraryVersion version, List<Group> groups,
 			List<ProhibitedVersion> prohibitedVersions, boolean considerSnapshots, VersionAlignment versionAlignment,
-			Map<String, Function<LibraryVersion, String>> links) {
+			String linkRootName, Map<String, Function<LibraryVersion, String>> links) {
 		this.name = name;
 		this.calendarName = (calendarName != null) ? calendarName : name;
 		this.version = version;
@@ -89,6 +93,7 @@ public Library(String name, String calendarName, LibraryVersion version, List<Gr
 		this.prohibitedVersions = prohibitedVersions;
 		this.considerSnapshots = considerSnapshots;
 		this.versionAlignment = versionAlignment;
+		this.linkRootName = linkRootName;
 		this.links = Collections.unmodifiableMap(links);
 	}
 
@@ -124,6 +129,10 @@ public VersionAlignment getVersionAlignment() {
 		return this.versionAlignment;
 	}
 
+	public String getLinkRootName() {
+		return this.linkRootName;
+	}
+
 	public Map<String, String> getLinks() {
 		Map<String, String> links = new TreeMap<>();
 		this.links.forEach((name, linkFactory) -> links.put(name, linkFactory.apply(this.version)));

buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/UpgradeApplicatorTests.java

@@ -54,7 +54,7 @@ void whenUpgradeIsAppliedToLibraryWithVersionThenBomIsUpdated() throws IOExcepti
 		FileCopyUtils.copy(new File("src/test/resources/gradle.properties"), gradleProperties);
 		new UpgradeApplicator(bom.toPath(), gradleProperties.toPath())
 			.apply(new Upgrade(new Library("ActiveMQ", null, new LibraryVersion(DependencyVersion.parse("5.15.11")),
-					null, null, false, null, Collections.emptyMap()), DependencyVersion.parse("5.16")));
+					null, null, false, null, null, Collections.emptyMap()), DependencyVersion.parse("5.16")));
 		String bomContents = Files.readString(bom.toPath());
 		assertThat(bomContents).hasSize(originalContents.length() - 3);
 	}
@@ -67,7 +67,7 @@ void whenUpgradeIsAppliedToLibraryWithVersionPropertyThenGradlePropertiesIsUpdat
 		FileCopyUtils.copy(new File("src/test/resources/gradle.properties"), gradleProperties);
 		new UpgradeApplicator(bom.toPath(), gradleProperties.toPath())
 			.apply(new Upgrade(new Library("Kotlin", null, new LibraryVersion(DependencyVersion.parse("1.3.70")), null,
-					null, false, null, Collections.emptyMap()), DependencyVersion.parse("1.4")));
+					null, false, null, null, Collections.emptyMap()), DependencyVersion.parse("1.4")));
 		Properties properties = new Properties();
 		try (InputStream in = new FileInputStream(gradleProperties)) {
 			properties.load(in);