miraleung · Oct 30, 2020 · Oct 27, 2020 · Oct 30, 2020 · Oct 27, 2020 · Oct 26, 2020
diff --git a/src/main/java/com/google/api/generator/engine/ast/ConcreteReference.java b/src/main/java/com/google/api/generator/engine/ast/ConcreteReference.java
@@ -89,11 +89,18 @@ public String pakkage() {
   public abstract boolean useFullName();
 
   @Override
-  public String enclosingClassName() {
+  public ImmutableList<String> enclosingClassNames() {
     if (!hasEnclosingClass()) {
-      return null;
+      return ImmutableList.of();
     }
-    return clazz().getEnclosingClass().getSimpleName();
+    // The innermost type will be the last element in the list.
+    ImmutableList.Builder<String> listBuilder = new ImmutableList.Builder<>();
+    Class currentClz = clazz();
+    while (currentClz.getEnclosingClass() != null) {
+      listBuilder.add(currentClz.getEnclosingClass().getSimpleName());
+      currentClz = currentClz.getEnclosingClass();
+    }
+    return listBuilder.build();
   }
 
   @Override

diff --git a/src/main/java/com/google/api/generator/engine/ast/Reference.java b/src/main/java/com/google/api/generator/engine/ast/Reference.java
@@ -30,7 +30,7 @@ public interface Reference {
   boolean useFullName();
 
   @Nullable
-  String enclosingClassName();
+  ImmutableList<String> enclosingClassNames();
 
   @Nullable
   Reference wildcardUpperBound();

diff --git a/src/main/java/com/google/api/generator/engine/ast/VaporReference.java b/src/main/java/com/google/api/generator/engine/ast/VaporReference.java
@@ -15,9 +15,9 @@
 package com.google.api.generator.engine.ast;
 
 import com.google.auto.value.AutoValue;
-import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 import javax.annotation.Nullable;
@@ -43,7 +43,7 @@ public abstract class VaporReference implements Reference {
 
   @Nullable
   @Override
-  public abstract String enclosingClassName();
+  public abstract ImmutableList<String> enclosingClassNames();
 
   @Nullable
   public abstract Reference supertypeReference();
@@ -56,9 +56,9 @@ public Reference wildcardUpperBound() {
 
   @Override
   public String fullName() {
-    // TODO(unsupported): Nested classes with depth greater than 1.
     if (hasEnclosingClass()) {
-      return String.format("%s.%s.%s", pakkage(), enclosingClassName(), plainName());
+      return String.format(
+          "%s.%s.%s", pakkage(), String.join(DOT, enclosingClassNames()), plainName());
     }
     return String.format("%s.%s", pakkage(), plainName());
   }
@@ -68,7 +68,7 @@ public String fullName() {
 
   @Override
   public boolean hasEnclosingClass() {
-    return !Strings.isNullOrEmpty(enclosingClassName());
+    return !enclosingClassNames().isEmpty();
   }
 
   @Override
@@ -86,7 +86,7 @@ public boolean isSupertypeOrEquals(Reference other) {
     VaporReference ref = (VaporReference) other;
     return pakkage().equals(ref.pakkage())
         && plainName().equals(ref.plainName())
-        && Objects.equals(enclosingClassName(), ref.enclosingClassName());
+        && Objects.equals(enclosingClassNames(), ref.enclosingClassNames());
   }
 
   @Override
@@ -112,14 +112,14 @@ public boolean equals(Object o) {
     return pakkage().equals(ref.pakkage())
         && name().equals(ref.name())
         && generics().equals(ref.generics())
-        && Objects.equals(enclosingClassName(), ref.enclosingClassName());
+        && Objects.equals(enclosingClassNames(), ref.enclosingClassNames());
   }
 
   @Override
   public int hashCode() {
     int hash = 17 * pakkage().hashCode() + 19 * name().hashCode() + 23 * generics().hashCode();
-    if (!Strings.isNullOrEmpty(enclosingClassName())) {
-      hash += 29 * enclosingClassName().hashCode();
+    if (!enclosingClassNames().isEmpty()) {
+      hash += 29 * enclosingClassNames().hashCode();
     }
     return hash;
   }
@@ -133,7 +133,8 @@ public static Builder builder() {
     return new AutoValue_VaporReference.Builder()
         .setUseFullName(false)
         .setGenerics(ImmutableList.of())
-        .setIsStaticImport(false);
+        .setIsStaticImport(false)
+        .setEnclosingClassNames(Collections.emptyList());
   }
 
   // Private.
@@ -153,7 +154,11 @@ public Builder setGenerics(Reference... references) {
 
     public abstract Builder setGenerics(List<Reference> clazzes);
 
-    public abstract Builder setEnclosingClassName(String enclosingClassName);
+    public Builder setEnclosingClassNames(String... enclosingClassNames) {
+      return setEnclosingClassNames(Arrays.asList(enclosingClassNames));
+    }
+
+    public abstract Builder setEnclosingClassNames(List<String> enclosingClassNames);
 
     public abstract Builder setIsStaticImport(boolean isStaticImport);
 
@@ -166,8 +171,7 @@ public Builder setGenerics(Reference... references) {
 
     abstract ImmutableList<Reference> generics();
 
-    @Nullable
-    abstract String enclosingClassName();
+    abstract ImmutableList<String> enclosingClassNames();
 
     abstract boolean isStaticImport();
 
@@ -180,11 +184,11 @@ public VaporReference build() {
 
       setPlainName(name());
 
-      setIsStaticImport(enclosingClassName() != null && isStaticImport());
+      setIsStaticImport(!enclosingClassNames().isEmpty() && isStaticImport());
 
       StringBuilder sb = new StringBuilder();
-      if (enclosingClassName() != null && !isStaticImport()) {
-        sb.append(enclosingClassName());
+      if (!enclosingClassNames().isEmpty() && !isStaticImport()) {
+        sb.append(String.join(DOT, enclosingClassNames()));
         sb.append(DOT);
       }
 

diff --git a/src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java b/src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java
@@ -68,6 +68,7 @@
 import javax.annotation.Nullable;
 
 public class ImportWriterVisitor implements AstNodeVisitor {
+  private static final String DOT = ".";
   private static final String NEWLINE = "\n";
   private static final String PKG_JAVA_LANG = "java.lang";
 
@@ -423,7 +424,8 @@ private void references(List<Reference> refs) {
 
       if (ref.isStaticImport()
           && !Strings.isNullOrEmpty(currentClassName)
-          && ref.enclosingClassName().equals(currentClassName)) {
+          && !ref.enclosingClassNames().isEmpty()
+          && ref.enclosingClassNames().contains(currentClassName)) {
         continue;
       }
 
@@ -432,7 +434,8 @@ private void references(List<Reference> refs) {
         staticImports.add(ref.fullName());
       } else {
         if (ref.hasEnclosingClass()) {
-          imports.add(String.format("%s.%s", ref.pakkage(), ref.enclosingClassName()));
+          imports.add(
+              String.format("%s.%s", ref.pakkage(), String.join(DOT, ref.enclosingClassNames())));
         } else {
           imports.add(ref.fullName());
         }

diff --git a/src/main/java/com/google/api/generator/gapic/composer/BatchingDescriptorComposer.java b/src/main/java/com/google/api/generator/gapic/composer/BatchingDescriptorComposer.java
@@ -153,7 +153,7 @@ private static MethodDefinition createGetRequestBuilderMethod(
     TypeNode builderType =
         TypeNode.withReference(
             VaporReference.builder()
-                .setEnclosingClassName(method.inputType().reference().name())
+                .setEnclosingClassNames(method.inputType().reference().name())
                 .setName("Builder")
                 .setPakkage(method.inputType().reference().pakkage())
                 .build());

diff --git a/src/main/java/com/google/api/generator/gapic/composer/GrpcServiceStubClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/GrpcServiceStubClassComposer.java
@@ -1049,7 +1049,7 @@ private static Map<String, TypeNode> createDynamicTypes(Service service, String
                             VaporReference.builder()
                                 .setName(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, m.name()))
                                 .setPakkage(service.pakkage())
-                                .setEnclosingClassName(String.format("%sClient", service.name()))
+                                .setEnclosingClassNames(String.format("%sClient", service.name()))
                                 .setIsStaticImport(true)
                                 .build()))));
     return types;

diff --git a/src/main/java/com/google/api/generator/gapic/composer/ResourceNameHelperClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ResourceNameHelperClassComposer.java
@@ -1575,7 +1575,7 @@ private static Map<String, TypeNode> createDynamicTypes(
             VaporReference.builder()
                 .setName("Builder")
                 .setPakkage(resourceName.pakkage())
-                .setEnclosingClassName(thisClassName)
+                .setEnclosingClassNames(thisClassName)
                 .setIsStaticImport(true)
                 .build()));
 
@@ -1591,7 +1591,7 @@ private static Map<String, TypeNode> createDynamicTypes(
                               VaporReference.builder()
                                   .setName(s)
                                   .setPakkage(resourceName.pakkage())
-                                  .setEnclosingClassName(thisClassName)
+                                  .setEnclosingClassNames(thisClassName)
                                   .setIsStaticImport(true)
                                   .build()))));
     }

diff --git a/src/main/java/com/google/api/generator/gapic/composer/ServiceClientClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientClassComposer.java
@@ -1441,7 +1441,7 @@ private static Map<String, TypeNode> createVaporTypes(Service service) {
                               VaporReference.builder()
                                   .setName(
                                       String.format(t, JavaStyle.toUpperCamelCase(method.name())))
-                                  .setEnclosingClassName(getClientClassName(service.name()))
+                                  .setEnclosingClassNames(getClientClassName(service.name()))
                                   .setPakkage(service.pakkage())
                                   .setIsStaticImport(true) // Same class, so they won't be imported.
                                   .build()))));
@@ -1466,7 +1466,7 @@ private static Map<String, TypeNode> createVaporTypes(Service service) {
                             VaporReference.builder()
                                 .setName(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, m.name()))
                                 .setPakkage(service.pakkage())
-                                .setEnclosingClassName(getClientClassName(service.name()))
+                                .setEnclosingClassNames(getClientClassName(service.name()))
                                 .setIsStaticImport(true)
                                 .build()))));
     return types;

diff --git a/src/main/java/com/google/api/generator/gapic/composer/ServiceClientTestClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientTestClassComposer.java
@@ -1749,7 +1749,7 @@ private static Map<String, TypeNode> createDynamicTypes(Service service) {
                             VaporReference.builder()
                                 .setName(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, m.name()))
                                 .setPakkage(service.pakkage())
-                                .setEnclosingClassName(getClientClassName(service.name()))
+                                .setEnclosingClassNames(getClientClassName(service.name()))
                                 .setIsStaticImport(true)
                                 .build()))));
     return types;
@@ -1864,7 +1864,7 @@ private static TypeNode getPagedResponseType(Method method, Service service) {
         VaporReference.builder()
             .setName(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, method.name()))
             .setPakkage(service.pakkage())
-            .setEnclosingClassName(getClientClassName(service.name()))
+            .setEnclosingClassNames(getClientClassName(service.name()))
             .setIsStaticImport(true)
             .build());
   }

diff --git a/src/main/java/com/google/api/generator/gapic/composer/ServiceSettingsClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceSettingsClassComposer.java
@@ -230,7 +230,7 @@ private static MethodDefinition createCreatorMethod(
         TypeNode.withReference(
             VaporReference.builder()
                 .setName("Builder")
-                .setEnclosingClassName(String.format("%sSettings", service.name()))
+                .setEnclosingClassNames(String.format("%sSettings", service.name()))
                 .setPakkage(service.pakkage())
                 .build());
     Expr returnMethodExpr =
@@ -712,7 +712,7 @@ private static Map<String, TypeNode> createDynamicTypes(Service service) {
         TypeNode.withReference(
             VaporReference.builder()
                 .setName(BUILDER_CLASS_NAME)
-                .setEnclosingClassName(getThisClassName(service.name()))
+                .setEnclosingClassNames(getThisClassName(service.name()))
                 .setPakkage(service.pakkage())
                 .setIsStaticImport(true)
                 .build()));
@@ -729,7 +729,7 @@ private static Map<String, TypeNode> createDynamicTypes(Service service) {
                             VaporReference.builder()
                                 .setName(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, m.name()))
                                 .setPakkage(service.pakkage())
-                                .setEnclosingClassName(getClientClassName(service.name()))
+                                .setEnclosingClassNames(getClientClassName(service.name()))
                                 .setIsStaticImport(true)
                                 .build()))));
     return types;
@@ -828,7 +828,7 @@ private static TypeNode getStubSettingsBuilderType(Service service) {
         VaporReference.builder()
             .setPakkage(service.pakkage())
             .setName(BUILDER_CLASS_NAME)
-            .setEnclosingClassName(getStubSettingsClassName(service.name()))
+            .setEnclosingClassNames(getStubSettingsClassName(service.name()))
             .build());
   }
 

diff --git a/src/main/java/com/google/api/generator/gapic/composer/ServiceStubClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceStubClassComposer.java
@@ -262,7 +262,7 @@ private static Map<String, TypeNode> createTypes(
                             VaporReference.builder()
                                 .setName(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, m.name()))
                                 .setPakkage(service.pakkage())
-                                .setEnclosingClassName(getClientClassName(service.name()))
+                                .setEnclosingClassNames(getClientClassName(service.name()))
                                 .setIsStaticImport(true)
                                 .build()))));
 

diff --git a/src/main/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposer.java
@@ -133,6 +133,7 @@ public class ServiceStubSettingsClassComposer {
   private static final String OPERATION_SETTINGS_LITERAL = "OperationSettings";
   private static final String SETTINGS_LITERAL = "Settings";
 
+  private static final String DOT = ".";
   private static final String LEFT_BRACE = "{";
   private static final String RIGHT_BRACE = "}";
   private static final String SLASH = "/";
@@ -1369,7 +1370,7 @@ private static List<MethodDefinition> createNestedClassConstructorMethods(
         t ->
             TypeNode.withReference(
                 VaporReference.builder()
-                    .setName(t.reference().enclosingClassName())
+                    .setName(String.join(DOT, t.reference().enclosingClassNames()))
                     .setPakkage(t.reference().pakkage())
                     .build());
     List<Statement> ctorBodyStatements = new ArrayList<>();
@@ -1845,7 +1846,7 @@ private static Map<String, TypeNode> createDynamicTypes(Service service, String
             VaporReference.builder()
                 .setName(NESTED_BUILDER_CLASS_NAME)
                 .setPakkage(pakkage)
-                .setEnclosingClassName(thisClassName)
+                .setEnclosingClassNames(thisClassName)
                 .setIsStaticImport(true)
                 .build()));
 
@@ -1874,7 +1875,7 @@ private static Map<String, TypeNode> createDynamicTypes(Service service, String
                             VaporReference.builder()
                                 .setName(getPagedResponseTypeName(m.name()))
                                 .setPakkage(service.pakkage())
-                                .setEnclosingClassName(String.format("%sClient", service.name()))
+                                .setEnclosingClassNames(String.format("%sClient", service.name()))
                                 .setIsStaticImport(true)
                                 .build()))));
 

diff --git a/src/main/java/com/google/api/generator/gapic/model/Message.java b/src/main/java/com/google/api/generator/gapic/model/Message.java
@@ -19,6 +19,7 @@
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
@@ -41,6 +42,11 @@ public abstract class Message {
   @Nullable
   public abstract ResourceName resource();
 
+  // The nested types in left-to-right order, if any.
+  // Example: com.google.Foo.Bar.Car.ThisType will have the outer types listed in the order
+  // [Foo, Bar, Car].
+  public abstract ImmutableList<String> outerNestedTypes();
+
   public abstract Builder toBuilder();
 
   public boolean hasResource() {
@@ -60,7 +66,7 @@ public Field findAndUnwrapFirstRepeatedField() {
   }
 
   public static Builder builder() {
-    return new AutoValue_Message.Builder();
+    return new AutoValue_Message.Builder().setOuterNestedTypes(Collections.emptyList());
   }
 
   @AutoValue.Builder
@@ -73,6 +79,8 @@ public abstract static class Builder {
 
     public abstract Builder setResource(ResourceName resource);
 
+    public abstract Builder setOuterNestedTypes(List<String> outerNestedTypes);
+
     abstract Builder setFieldMap(Map<String, Field> fieldMap);
 
     abstract ImmutableList<Field> fields();