[ggj][codegen] feat: add settingsBuilder getters in ServiceStubSettings

src/main/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposer.java

@@ -1170,8 +1170,8 @@ private static List<MethodDefinition> createNestedClassMethods(
     nestedClassMethods.add(createNestedClassInitDefaultsMethod(service, serviceConfig, types));
     nestedClassMethods.add(createNestedClassApplyToAllUnaryMethodsMethod(superType, types));
     nestedClassMethods.add(createNestedClassUnaryMethodSettingsBuilderGetterMethod());
-
-    // TODO(miraleung): More methods.
+    nestedClassMethods.addAll(
+        createNestedClassSettingsBuilderGetterMethods(nestedMethodSettingsMemberVarExprs));
     nestedClassMethods.add(createNestedClassBuildMethod(service, types));
     return nestedClassMethods;
   }
@@ -1556,6 +1556,43 @@ private static MethodDefinition createNestedClassUnaryMethodSettingsBuilderGette
         .build();
   }
 
+  private static List<MethodDefinition> createNestedClassSettingsBuilderGetterMethods(
+      Map<String, VariableExpr> nestedMethodSettingsMemberVarExprs) {
+    Reference operationCallSettingsBuilderRef =
+        ConcreteReference.withClazz(OperationCallSettings.Builder.class);
+    Function<TypeNode, Boolean> isOperationCallSettingsBuilderFn =
+        t ->
+            t.reference()
+                .copyAndSetGenerics(ImmutableList.of())
+                .equals(operationCallSettingsBuilderRef);
+    List<AnnotationNode> lroBetaAnnotations =
+        Arrays.asList(
+            AnnotationNode.builder()
+                .setType(STATIC_TYPES.get("BetaApi"))
+                .setDescription(
+                    "The surface for use by generated code is not stable yet and may change in the"
+                        + " future.")
+                .build());
+
+    List<MethodDefinition> javaMethods = new ArrayList<>();
+    for (Map.Entry<String, VariableExpr> settingsVarEntry :
+        nestedMethodSettingsMemberVarExprs.entrySet()) {
+      String varName = settingsVarEntry.getKey();
+      VariableExpr settingsVarExpr = settingsVarEntry.getValue();
+      boolean isOperationCallSettings =
+          isOperationCallSettingsBuilderFn.apply(settingsVarExpr.type());
+      javaMethods.add(
+          MethodDefinition.builder()
+              .setAnnotations(isOperationCallSettings ? lroBetaAnnotations : ImmutableList.of())
+              .setScope(ScopeNode.PUBLIC)
+              .setReturnType(settingsVarExpr.type())
+              .setName(settingsVarExpr.variable().identifier().name())
+              .setReturnExpr(settingsVarExpr)
+              .build());
+    }
+    return javaMethods;
+  }
+
   private static MethodDefinition createNestedClassBuildMethod(
       Service service, Map<String, TypeNode> types) {
     TypeNode outerClassType = types.get(getThisClassName(service.name()));

src/test/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposerTest.java

@@ -518,6 +518,52 @@ public void generateServiceClasses() {
           + "      return unaryMethodSettingsBuilders;\n"
           + "    }\n"
           + "\n"
+          + "    public UnaryCallSettings.Builder<EchoRequest, EchoResponse> echoSettings() {\n"
+          + "      return echoSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    public ServerStreamingCallSettings.Builder<ExpandRequest, EchoResponse>"
+          + " expandSettings() {\n"
+          + "      return expandSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> collectSettings()"
+          + " {\n"
+          + "      return collectSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatSettings()"
+          + " {\n"
+          + "      return chatSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse>"
+          + " chatAgainSettings() {\n"
+          + "      return chatAgainSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    public PagedCallSettings.Builder<\n"
+          + "            PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>\n"
+          + "        pagedExpandSettings() {\n"
+          + "      return pagedExpandSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    public UnaryCallSettings.Builder<WaitRequest, Operation> waitSettings() {\n"
+          + "      return waitSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    @BetaApi(\n"
+          + "        \"The surface for use by generated code is not stable yet and may change in"
+          + " the future.\")\n"
+          + "    public OperationCallSettings.Builder<WaitRequest, WaitResponse, WaitMetadata>\n"
+          + "        waitOperationSettings() {\n"
+          + "      return waitOperationSettings;\n"
+          + "    }\n"
+          + "\n"
+          + "    public UnaryCallSettings.Builder<BlockRequest, BlockResponse> blockSettings() {\n"
+          + "      return blockSettings;\n"
+          + "    }\n"
+          + "\n"
           + "    @Override\n"
           + "    public EchoStubSettings build() throws IOException {\n"
           + "      return new EchoStubSettings(this);\n"