GH-1015 - Polishing.

spring-modulith-core/src/main/java/org/springframework/modulith/core/ModulithMetadata.java

@@ -17,7 +17,6 @@
 
 import java.util.List;
 import java.util.Optional;
-import java.util.function.Supplier;
 import java.util.Set;
 import java.util.stream.Stream;
 
@@ -38,26 +37,24 @@
 public interface ModulithMetadata {
 
 	static final String ANNOTATION_MISSING = "Modules can only be retrieved from a root type, but %s is not annotated with either @%s, @%s or @%s!";
+	static final String WITH_ANNOTATIONS = ANNOTATION_MISSING.formatted("%s", Modulith.class.getSimpleName(),
+			Modulithic.class.getSimpleName(), SpringTypes.AT_SPRING_BOOT_APPLICATION);
 
 	/**
 	 * Creates a new {@link ModulithMetadata} for the given annotated type. Expects the type either be annotated with
 	 * {@link Modulith}, {@link Modulithic} or {@link org.springframework.boot.autoconfigure.SpringBootApplication}.
 	 *
 	 * @param annotated must not be {@literal null}.
-	 * @return
+	 * @return will never be {@literal null}.
 	 * @throws IllegalArgumentException in case none of the above mentioned annotations is present on the given type.
 	 */
 	public static ModulithMetadata of(Class<?> annotated) {
 
 		Assert.notNull(annotated, "Annotated type must not be null!");
 
-		Supplier<IllegalArgumentException> exception = () -> new IllegalArgumentException(
-				String.format(ANNOTATION_MISSING, annotated.getSimpleName(), Modulith.class.getSimpleName(),
-						Modulithic.class.getSimpleName(), SpringTypes.AT_SPRING_BOOT_APPLICATION));
-
-		Supplier<ModulithMetadata> withDefaults = () -> SpringBootModulithMetadata.of(annotated).orElseThrow(exception);
-
-		return AnnotationModulithMetadata.of(annotated).orElseGet(withDefaults);
+		return AnnotationModulithMetadata.of(annotated)
+				.or(() -> SpringBootModulithMetadata.of(annotated))
+				.orElseThrow(() -> new IllegalArgumentException(WITH_ANNOTATIONS.formatted(annotated.getSimpleName())));
 	}
 
 	/**

spring-modulith-core/src/test/java/org/springframework/modulith/core/ModulithMetadataUnitTest.java

@@ -32,35 +32,38 @@
 class ModulithMetadataUnitTest {
 
 	@Test
-	public void inspectsModulithAnnotation() throws Exception {
+	void inspectsModulithAnnotation() throws Exception {
 
 		Stream.of(ModulithAnnotated.class, ModuliticAnnotated.class) //
 				.map(ModulithMetadata::of) //
 				.forEach(it -> {
 
 					assertThat(it.getBasePackages()).containsExactly("org.springframework.modulith.core", "com.acme.foo");
-					assertThat(it.getSharedModuleNames()).containsExactly("shared.module");
+					assertThat(it.getSharedModuleIdentifiers())
+							.extracting(ApplicationModuleIdentifier::toString)
+							.containsExactly("shared.module");
 					assertThat(it.getSystemName()).hasValue("systemName");
 					assertThat(it.useFullyQualifiedModuleNames()).isTrue();
 				});
 	}
 
 	@Test
-	public void usesDefaultsIfModulithAnnotationsAreMissing() {
+	void usesDefaultsIfModulithAnnotationsAreMissing() {
 
 		ModulithMetadata metadata = ModulithMetadata.of(SpringBootApplicationAnnotated.class);
 
 		assertThat(metadata.getBasePackages()).contains("org.springframework.modulith.core");
-		assertThat(metadata.getSharedModuleNames()).isEmpty();
+		assertThat(metadata.getSharedModuleIdentifiers()).isEmpty();
 		assertThat(metadata.getSystemName()).hasValue(SpringBootApplicationAnnotated.class.getSimpleName());
 		assertThat(metadata.useFullyQualifiedModuleNames()).isFalse();
 	}
 
 	@Test
-	public void rejectsTypeNotAnnotatedWithEitherModulithAnnotationOrSpringBootApplication() {
+	void rejectsTypeNotAnnotatedWithEitherModulithAnnotationOrSpringBootApplication() {
 
 		assertThatExceptionOfType(IllegalArgumentException.class) //
 				.isThrownBy(() -> ModulithMetadata.of(Unannotated.class)) //
+				.withMessageContaining(Unannotated.class.getSimpleName()) //
 				.withMessageContaining(Modulith.class.getSimpleName()) //
 				.withMessageContaining(Modulithic.class.getSimpleName()) //
 				.withMessageContaining(SpringBootApplication.class.getSimpleName());