Add modifiers support to TypeDeclaration

Closes gh-908

initializr-generator-spring/src/main/java/io/spring/initializr/generator/spring/code/java/JavaProjectGenerationDefaultContributorsConfiguration.java

@@ -46,18 +46,21 @@ class JavaProjectGenerationDefaultContributorsConfiguration {
 
 	@Bean
 	public MainApplicationTypeCustomizer<JavaTypeDeclaration> mainMethodContributor() {
-		return (typeDeclaration) -> typeDeclaration
-				.addMethodDeclaration(JavaMethodDeclaration.method("main")
-						.modifiers(Modifier.PUBLIC | Modifier.STATIC).returning("void")
-						.parameters(new Parameter("java.lang.String[]", "args"))
-						.body(new JavaExpressionStatement(new JavaMethodInvocation(
-								"org.springframework.boot.SpringApplication", "run",
-								typeDeclaration.getName() + ".class", "args"))));
+		return (typeDeclaration) -> {
+			typeDeclaration.modifiers(Modifier.PUBLIC);
+			typeDeclaration.addMethodDeclaration(JavaMethodDeclaration.method("main")
+					.modifiers(Modifier.PUBLIC | Modifier.STATIC).returning("void")
+					.parameters(new Parameter("java.lang.String[]", "args"))
+					.body(new JavaExpressionStatement(new JavaMethodInvocation(
+							"org.springframework.boot.SpringApplication", "run",
+							typeDeclaration.getName() + ".class", "args"))));
+		};
 	}
 
 	@Bean
 	public TestApplicationTypeCustomizer<JavaTypeDeclaration> testMethodContributor() {
 		return (typeDeclaration) -> {
+			typeDeclaration.modifiers(Modifier.PUBLIC);
 			JavaMethodDeclaration method = JavaMethodDeclaration.method("contextLoads")
 					.modifiers(Modifier.PUBLIC).returning("void").body();
 			method.annotate(Annotation.name("org.junit.Test"));
@@ -76,6 +79,7 @@ class JavaProjectGenerationDefaultContributorsConfiguration {
 		public ServletInitializerCustomizer<JavaTypeDeclaration> javaServletInitializerCustomizer(
 				ResolvedProjectDescription projectDescription) {
 			return (typeDeclaration) -> {
+				typeDeclaration.modifiers(Modifier.PUBLIC);
 				JavaMethodDeclaration configure = JavaMethodDeclaration
 						.method("configure").modifiers(Modifier.PROTECTED)
 						.returning(

initializr-generator/src/main/java/io/spring/initializr/generator/language/groovy/GroovySourceCodeWriter.java

@@ -49,18 +49,23 @@ import io.spring.initializr.generator.language.SourceCodeWriter;
  */
 public class GroovySourceCodeWriter implements SourceCodeWriter<GroovySourceCode> {
 
+	private static final Map<Predicate<Integer>, String> TYPE_MODIFIERS;
+
 	private static final Map<Predicate<Integer>, String> METHOD_MODIFIERS;
 
 	static {
-		Map<Predicate<Integer>, String> methodModifiers = new LinkedHashMap<>();
-		methodModifiers.put(Modifier::isProtected, "protected");
-		methodModifiers.put(Modifier::isPrivate, "private");
-		methodModifiers.put(Modifier::isAbstract, "abstract");
-		methodModifiers.put(Modifier::isStatic, "static");
-		methodModifiers.put(Modifier::isFinal, "final");
+		Map<Predicate<Integer>, String> typeModifiers = new LinkedHashMap<>();
+		typeModifiers.put(Modifier::isProtected, "protected");
+		typeModifiers.put(Modifier::isPrivate, "private");
+		typeModifiers.put(Modifier::isAbstract, "abstract");
+		typeModifiers.put(Modifier::isStatic, "static");
+		typeModifiers.put(Modifier::isFinal, "final");
+		typeModifiers.put(Modifier::isStrict, "strictfp");
+		TYPE_MODIFIERS = typeModifiers;
+		Map<Predicate<Integer>, String> methodModifiers = new LinkedHashMap<>(
+				typeModifiers);
 		methodModifiers.put(Modifier::isSynchronized, "synchronized");
 		methodModifiers.put(Modifier::isNative, "native");
-		methodModifiers.put(Modifier::isStrict, "strictfp");
 		METHOD_MODIFIERS = methodModifiers;
 	}
 
@@ -97,6 +102,7 @@ public class GroovySourceCodeWriter implements SourceCodeWriter<GroovySourceCode
 			}
 			for (GroovyTypeDeclaration type : compilationUnit.getTypeDeclarations()) {
 				writeAnnotations(writer, type);
+				writeModifiers(writer, TYPE_MODIFIERS, type.getModifiers());
 				writer.print("class " + type.getName());
 				if (type.getExtends() != null) {
 					writer.print(" extends " + getUnqualifiedName(type.getExtends()));
@@ -167,7 +173,7 @@ public class GroovySourceCodeWriter implements SourceCodeWriter<GroovySourceCode
 	private void writeMethodDeclaration(IndentingWriter writer,
 			GroovyMethodDeclaration methodDeclaration) {
 		writeAnnotations(writer, methodDeclaration);
-		writeMethodModifiers(writer, methodDeclaration);
+		writeModifiers(writer, METHOD_MODIFIERS, methodDeclaration.getModifiers());
 		writer.print(getUnqualifiedName(methodDeclaration.getReturnType()) + " "
 				+ methodDeclaration.getName() + "(");
 		List<Parameter> parameters = methodDeclaration.getParameters();
@@ -196,10 +202,10 @@ public class GroovySourceCodeWriter implements SourceCodeWriter<GroovySourceCode
 		writer.println();
 	}
 
-	private void writeMethodModifiers(IndentingWriter writer,
-			GroovyMethodDeclaration methodDeclaration) {
-		String modifiers = METHOD_MODIFIERS.entrySet().stream()
-				.filter((entry) -> entry.getKey().test(methodDeclaration.getModifiers()))
+	private void writeModifiers(IndentingWriter writer,
+			Map<Predicate<Integer>, String> availableModifiers, int declaredModifiers) {
+		String modifiers = availableModifiers.entrySet().stream()
+				.filter((entry) -> entry.getKey().test(declaredModifiers))
 				.map(Entry::getValue).collect(Collectors.joining(" "));
 		if (!modifiers.isEmpty()) {
 			writer.print(modifiers);

initializr-generator/src/main/java/io/spring/initializr/generator/language/groovy/GroovyTypeDeclaration.java

@@ -28,12 +28,22 @@ import io.spring.initializr.generator.language.TypeDeclaration;
  */
 public class GroovyTypeDeclaration extends TypeDeclaration {
 
+	private int modifiers;
+
 	private final List<GroovyMethodDeclaration> methodDeclarations = new ArrayList<>();
 
 	GroovyTypeDeclaration(String name) {
 		super(name);
 	}
 
+	public void modifiers(int modifiers) {
+		this.modifiers = modifiers;
+	}
+
+	public int getModifiers() {
+		return this.modifiers;
+	}
+
 	public void addMethodDeclaration(GroovyMethodDeclaration methodDeclaration) {
 		this.methodDeclarations.add(methodDeclaration);
 	}

initializr-generator/src/main/java/io/spring/initializr/generator/language/java/JavaMethodDeclaration.java

@@ -16,7 +16,6 @@
 
 package io.spring.initializr.generator.language.java;
 
-import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -99,7 +98,7 @@ public final class JavaMethodDeclaration implements Annotatable {
 
 		private String returnType = "void";
 
-		private int modifiers = Modifier.PUBLIC;
+		private int modifiers;
 
 		private Builder(String name) {
 			this.name = name;

initializr-generator/src/main/java/io/spring/initializr/generator/language/java/JavaSourceCodeWriter.java

@@ -49,19 +49,24 @@ import io.spring.initializr.generator.language.SourceCodeWriter;
  */
 public class JavaSourceCodeWriter implements SourceCodeWriter<JavaSourceCode> {
 
+	private static final Map<Predicate<Integer>, String> TYPE_MODIFIERS;
+
 	private static final Map<Predicate<Integer>, String> METHOD_MODIFIERS;
 
 	static {
-		Map<Predicate<Integer>, String> methodModifiers = new LinkedHashMap<>();
-		methodModifiers.put(Modifier::isPublic, "public");
-		methodModifiers.put(Modifier::isProtected, "protected");
-		methodModifiers.put(Modifier::isPrivate, "private");
-		methodModifiers.put(Modifier::isAbstract, "abstract");
-		methodModifiers.put(Modifier::isStatic, "static");
-		methodModifiers.put(Modifier::isFinal, "final");
+		Map<Predicate<Integer>, String> typeModifiers = new LinkedHashMap<>();
+		typeModifiers.put(Modifier::isPublic, "public");
+		typeModifiers.put(Modifier::isProtected, "protected");
+		typeModifiers.put(Modifier::isPrivate, "private");
+		typeModifiers.put(Modifier::isAbstract, "abstract");
+		typeModifiers.put(Modifier::isStatic, "static");
+		typeModifiers.put(Modifier::isFinal, "final");
+		typeModifiers.put(Modifier::isStrict, "strictfp");
+		TYPE_MODIFIERS = typeModifiers;
+		Map<Predicate<Integer>, String> methodModifiers = new LinkedHashMap<>(
+				typeModifiers);
 		methodModifiers.put(Modifier::isSynchronized, "synchronized");
 		methodModifiers.put(Modifier::isNative, "native");
-		methodModifiers.put(Modifier::isStrict, "strictfp");
 		METHOD_MODIFIERS = methodModifiers;
 	}
 
@@ -98,7 +103,8 @@ public class JavaSourceCodeWriter implements SourceCodeWriter<JavaSourceCode> {
 			}
 			for (JavaTypeDeclaration type : compilationUnit.getTypeDeclarations()) {
 				writeAnnotations(writer, type);
-				writer.print("public class " + type.getName());
+				writeModifiers(writer, TYPE_MODIFIERS, type.getModifiers());
+				writer.print("class " + type.getName());
 				if (type.getExtends() != null) {
 					writer.print(" extends " + getUnqualifiedName(type.getExtends()));
 				}
@@ -169,7 +175,7 @@ public class JavaSourceCodeWriter implements SourceCodeWriter<JavaSourceCode> {
 	private void writeMethodDeclaration(IndentingWriter writer,
 			JavaMethodDeclaration methodDeclaration) {
 		writeAnnotations(writer, methodDeclaration);
-		writeMethodModifiers(writer, methodDeclaration);
+		writeModifiers(writer, METHOD_MODIFIERS, methodDeclaration.getModifiers());
 		writer.print(getUnqualifiedName(methodDeclaration.getReturnType()) + " "
 				+ methodDeclaration.getName() + "(");
 		List<Parameter> parameters = methodDeclaration.getParameters();
@@ -199,10 +205,10 @@ public class JavaSourceCodeWriter implements SourceCodeWriter<JavaSourceCode> {
 		writer.println();
 	}
 
-	private void writeMethodModifiers(IndentingWriter writer,
-			JavaMethodDeclaration methodDeclaration) {
-		String modifiers = METHOD_MODIFIERS.entrySet().stream()
-				.filter((entry) -> entry.getKey().test(methodDeclaration.getModifiers()))
+	private void writeModifiers(IndentingWriter writer,
+			Map<Predicate<Integer>, String> availableModifiers, int declaredModifiers) {
+		String modifiers = availableModifiers.entrySet().stream()
+				.filter((entry) -> entry.getKey().test(declaredModifiers))
 				.map(Entry::getValue).collect(Collectors.joining(" "));
 		if (!modifiers.isEmpty()) {
 			writer.print(modifiers);

initializr-generator/src/main/java/io/spring/initializr/generator/language/java/JavaTypeDeclaration.java

@@ -28,12 +28,22 @@ import io.spring.initializr.generator.language.TypeDeclaration;
  */
 public class JavaTypeDeclaration extends TypeDeclaration {
 
+	private int modifiers;
+
 	private final List<JavaMethodDeclaration> methodDeclarations = new ArrayList<>();
 
 	JavaTypeDeclaration(String name) {
 		super(name);
 	}
 
+	public void modifiers(int modifiers) {
+		this.modifiers = modifiers;
+	}
+
+	public int getModifiers() {
+		return this.modifiers;
+	}
+
 	public void addMethodDeclaration(JavaMethodDeclaration methodDeclaration) {
 		this.methodDeclarations.add(methodDeclaration);
 	}

initializr-generator/src/main/java/io/spring/initializr/generator/language/kotlin/KotlinSourceCodeWriter.java

@@ -78,6 +78,7 @@ public class KotlinSourceCodeWriter implements SourceCodeWriter<KotlinSourceCode
 			}
 			for (KotlinTypeDeclaration type : compilationUnit.getTypeDeclarations()) {
 				writeAnnotations(writer, type);
+				writeModifiers(writer, type.getModifiers());
 				writer.print("class " + type.getName());
 				if (type.getExtends() != null) {
 					writer.print(" : " + getUnqualifiedName(type.getExtends()) + "()");
@@ -113,7 +114,7 @@ public class KotlinSourceCodeWriter implements SourceCodeWriter<KotlinSourceCode
 			KotlinFunctionDeclaration functionDeclaration) {
 		writer.println();
 		writeAnnotations(writer, functionDeclaration);
-		writeMethodModifiers(writer, functionDeclaration);
+		writeModifiers(writer, functionDeclaration.getModifiers());
 		writer.print("fun ");
 		writer.print(functionDeclaration.getName() + "(");
 		List<Parameter> parameters = functionDeclaration.getParameters();
@@ -195,9 +196,9 @@ public class KotlinSourceCodeWriter implements SourceCodeWriter<KotlinSourceCode
 		return (values.size() > 1) ? "[" + result + "]" : result;
 	}
 
-	private void writeMethodModifiers(IndentingWriter writer,
-			KotlinFunctionDeclaration functionDeclaration) {
-		String modifiers = functionDeclaration.getModifiers().stream()
+	private void writeModifiers(IndentingWriter writer,
+			List<KotlinModifier> declaredModifiers) {
+		String modifiers = declaredModifiers.stream()
 				.filter((entry) -> !entry.equals(KotlinModifier.PUBLIC)).sorted()
 				.map((entry) -> entry.toString().toLowerCase(Locale.ENGLISH))
 				.collect(Collectors.joining(" "));

initializr-generator/src/main/java/io/spring/initializr/generator/language/kotlin/KotlinTypeDeclaration.java

@@ -17,6 +17,7 @@
 package io.spring.initializr.generator.language.kotlin;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 import io.spring.initializr.generator.language.TypeDeclaration;
@@ -28,12 +29,22 @@ import io.spring.initializr.generator.language.TypeDeclaration;
  */
 public class KotlinTypeDeclaration extends TypeDeclaration {
 
+	private List<KotlinModifier> modifiers = new ArrayList<>();
+
 	private final List<KotlinFunctionDeclaration> functionDeclarations = new ArrayList<>();
 
 	KotlinTypeDeclaration(String name) {
 		super(name);
 	}
 
+	public void modifiers(KotlinModifier... modifiers) {
+		this.modifiers = Arrays.asList(modifiers);
+	}
+
+	List<KotlinModifier> getModifiers() {
+		return this.modifiers;
+	}
+
 	public void addFunctionDeclaration(KotlinFunctionDeclaration methodDeclaration) {
 		this.functionDeclarations.add(methodDeclaration);
 	}

initializr-generator/src/test/java/io/spring/initializr/generator/language/groovy/GroovySourceCodeWriterTests.java

@@ -64,6 +64,18 @@ class GroovySourceCodeWriterTests {
 				"}");
 	}
 
+	@Test
+	void emptyTypeDeclarationWithModifiers() throws IOException {
+		GroovySourceCode sourceCode = new GroovySourceCode();
+		GroovyCompilationUnit compilationUnit = sourceCode
+				.createCompilationUnit("com.example", "Test");
+		GroovyTypeDeclaration test = compilationUnit.createTypeDeclaration("Test");
+		test.modifiers(Modifier.PUBLIC | Modifier.ABSTRACT);
+		List<String> lines = writeSingleType(sourceCode, "com/example/Test.groovy");
+		assertThat(lines).containsExactly("package com.example", "",
+				"abstract class Test {", "", "}");
+	}
+
 	@Test
 	void emptyTypeDeclarationWithSuperClass() throws IOException {
 		GroovySourceCode sourceCode = new GroovySourceCode();

initializr-generator/src/test/java/io/spring/initializr/generator/language/java/JavaSourceCodeWriterTests.java

@@ -60,8 +60,20 @@ class JavaSourceCodeWriterTests {
 				.createCompilationUnit("com.example", "Test");
 		compilationUnit.createTypeDeclaration("Test");
 		List<String> lines = writeSingleType(sourceCode, "com/example/Test.java");
+		assertThat(lines).containsExactly("package com.example;", "", "class Test {", "",
+				"}");
+	}
+
+	@Test
+	void emptyTypeDeclarationWithModifiers() throws IOException {
+		JavaSourceCode sourceCode = new JavaSourceCode();
+		JavaCompilationUnit compilationUnit = sourceCode
+				.createCompilationUnit("com.example", "Test");
+		JavaTypeDeclaration test = compilationUnit.createTypeDeclaration("Test");
+		test.modifiers(Modifier.PROTECTED | Modifier.ABSTRACT);
+		List<String> lines = writeSingleType(sourceCode, "com/example/Test.java");
 		assertThat(lines).containsExactly("package com.example;", "",
-				"public class Test {", "", "}");
+				"protected abstract class Test {", "", "}");
 	}
 
 	@Test
@@ -74,7 +86,7 @@ class JavaSourceCodeWriterTests {
 		List<String> lines = writeSingleType(sourceCode, "com/example/Test.java");
 		assertThat(lines).containsExactly("package com.example;", "",
 				"import com.example.build.TestParent;", "",
-				"public class Test extends TestParent {", "", "}");
+				"class Test extends TestParent {", "", "}");
 	}
 
 	@Test
@@ -83,15 +95,15 @@ class JavaSourceCodeWriterTests {
 		JavaCompilationUnit compilationUnit = sourceCode
 				.createCompilationUnit("com.example", "Test");
 		JavaTypeDeclaration test = compilationUnit.createTypeDeclaration("Test");
-		test.addMethodDeclaration(
-				JavaMethodDeclaration.method("trim").returning("java.lang.String")
-						.parameters(new Parameter("java.lang.String", "value"))
-						.body(new JavaReturnStatement(
-								new JavaMethodInvocation("value", "trim"))));
+		test.addMethodDeclaration(JavaMethodDeclaration.method("trim")
+				.returning("java.lang.String").modifiers(Modifier.PUBLIC)
+				.parameters(new Parameter("java.lang.String", "value"))
+				.body(new JavaReturnStatement(
+						new JavaMethodInvocation("value", "trim"))));
 		List<String> lines = writeSingleType(sourceCode, "com/example/Test.java");
-		assertThat(lines).containsExactly("package com.example;", "",
-				"public class Test {", "", "    public String trim(String value) {",
-				"        return value.trim();", "    }", "", "}");
+		assertThat(lines).containsExactly("package com.example;", "", "class Test {", "",
+				"    public String trim(String value) {", "        return value.trim();",
+				"    }", "", "}");
 	}
 
 	@Test
@@ -112,7 +124,7 @@ class JavaSourceCodeWriterTests {
 		assertThat(lines).containsExactly("package com.example;", "",
 				"import org.springframework.boot.SpringApplication;",
 				"import org.springframework.boot.autoconfigure.SpringBootApplication;",
-				"", "@SpringBootApplication", "public class Test {", "",
+				"", "@SpringBootApplication", "class Test {", "",
 				"    public static void main(String[] args) {",
 				"        SpringApplication.run(Test.class, args);", "    }", "", "}");
 	}
@@ -124,7 +136,7 @@ class JavaSourceCodeWriterTests {
 						(builder) -> builder.attribute("counter", Integer.class, "42")));
 		assertThat(lines).containsExactly("package com.example;", "",
 				"import org.springframework.test.TestApplication;", "",
-				"@TestApplication(counter = 42)", "public class Test {", "", "}");
+				"@TestApplication(counter = 42)", "class Test {", "", "}");
 	}
 
 	@Test
@@ -134,7 +146,7 @@ class JavaSourceCodeWriterTests {
 						(builder) -> builder.attribute("name", String.class, "test")));
 		assertThat(lines).containsExactly("package com.example;", "",
 				"import org.springframework.test.TestApplication;", "",
-				"@TestApplication(name = \"test\")", "public class Test {", "", "}");
+				"@TestApplication(name = \"test\")", "class Test {", "", "}");
 	}
 
 	@Test
@@ -144,7 +156,7 @@ class JavaSourceCodeWriterTests {
 						(builder) -> builder.attribute("value", String.class, "test")));
 		assertThat(lines).containsExactly("package com.example;", "",
 				"import org.springframework.test.TestApplication;", "",
-				"@TestApplication(\"test\")", "public class Test {", "", "}");
+				"@TestApplication(\"test\")", "class Test {", "", "}");
 	}
 
 	@Test
@@ -156,8 +168,7 @@ class JavaSourceCodeWriterTests {
 		assertThat(lines).containsExactly("package com.example;", "",
 				"import java.time.temporal.ChronoUnit;",
 				"import org.springframework.test.TestApplication;", "",
-				"@TestApplication(unit = ChronoUnit.SECONDS)", "public class Test {", "",
-				"}");
+				"@TestApplication(unit = ChronoUnit.SECONDS)", "class Test {", "", "}");
 	}
 
 	@Test
@@ -169,8 +180,8 @@ class JavaSourceCodeWriterTests {
 		assertThat(lines).containsExactly("package com.example;", "",
 				"import com.example.One;", "import com.example.Two;",
 				"import org.springframework.test.TestApplication;", "",
-				"@TestApplication(target = { One.class, Two.class })",
-				"public class Test {", "", "}");
+				"@TestApplication(target = { One.class, Two.class })", "class Test {", "",
+				"}");
 	}
 
 	@Test
@@ -184,7 +195,7 @@ class JavaSourceCodeWriterTests {
 				"import com.example.One;", "import java.time.temporal.ChronoUnit;",
 				"import org.springframework.test.TestApplication;", "",
 				"@TestApplication(target = One.class, unit = ChronoUnit.NANOS)",
-				"public class Test {", "", "}");
+				"class Test {", "", "}");
 	}
 
 	private List<String> writeClassAnnotation(Annotation annotation) throws IOException {
@@ -208,8 +219,8 @@ class JavaSourceCodeWriterTests {
 		test.addMethodDeclaration(method);
 		List<String> lines = writeSingleType(sourceCode, "com/example/Test.java");
 		assertThat(lines).containsExactly("package com.example;", "",
-				"import com.example.test.TestAnnotation;", "", "public class Test {", "",
-				"    @TestAnnotation", "    public void something() {", "    }", "", "}");
+				"import com.example.test.TestAnnotation;", "", "class Test {", "",
+				"    @TestAnnotation", "    void something() {", "    }", "", "}");
 	}
 
 	private List<String> writeSingleType(JavaSourceCode sourceCode, String location)

initializr-generator/src/test/java/io/spring/initializr/generator/language/kotlin/KotlinSourceCodeWriterTests.java

@@ -62,6 +62,18 @@ class KotlinSourceCodeWriterTests {
 		assertThat(lines).containsExactly("package com.example", "", "class Test");
 	}
 
+	@Test
+	void emptyTypeDeclarationWithModifiers() throws IOException {
+		KotlinSourceCode sourceCode = new KotlinSourceCode();
+		KotlinCompilationUnit compilationUnit = sourceCode
+				.createCompilationUnit("com.example", "Test");
+		KotlinTypeDeclaration test = compilationUnit.createTypeDeclaration("Test");
+		test.modifiers(KotlinModifier.PUBLIC, KotlinModifier.ABSTRACT);
+		List<String> lines = writeSingleType(sourceCode, "com/example/Test.kt");
+		assertThat(lines).containsExactly("package com.example", "",
+				"abstract class Test");
+	}
+
 	@Test
 	void emptyTypeDeclarationWithSuperClass() throws IOException {
 		KotlinSourceCode sourceCode = new KotlinSourceCode();