fix: Get numeric value for Enum fields if it is configured as query param or path param

src/main/java/com/google/api/generator/gapic/composer/rest/HttpJsonServiceStubClassComposer.java

@@ -59,6 +59,7 @@
 import com.google.api.generator.gapic.model.OperationResponse;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.utils.JavaStyle;
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.BiMap;
 import com.google.common.collect.ImmutableList;
 import com.google.protobuf.TypeRegistry;
@@ -74,6 +75,7 @@
 import java.util.stream.Collectors;
 
 public class HttpJsonServiceStubClassComposer extends AbstractTransportServiceStubClassComposer {
+
   private static final HttpJsonServiceStubClassComposer INSTANCE =
       new HttpJsonServiceStubClassComposer();
 
@@ -940,9 +942,11 @@ private Expr createFieldsExtractorClassInstance(
       for (int i = 0; i < descendantFields.length; i++) {
         String currFieldName = descendantFields[i];
         String bindingFieldMethodName =
-            (i < descendantFields.length - 1 || !httpBindingFieldName.isRepeated())
-                ? String.format("get%s", JavaStyle.toUpperCamelCase(currFieldName))
-                : String.format("get%sList", JavaStyle.toUpperCamelCase(currFieldName));
+            getBindingFieldMethodName(
+                httpBindingFieldName,
+                descendantFields.length,
+                i,
+                JavaStyle.toUpperCamelCase(currFieldName));
         requestFieldGetterExprBuilder =
             requestFieldGetterExprBuilder.setMethodName(bindingFieldMethodName);
 
@@ -997,6 +1001,7 @@ private Expr createFieldsExtractorClassInstance(
       }
     }
 
+    // Add a fixed query param for numeric enum, see b/232457244 for details
     if (restNumericEnumsEnabled && serializerMethodName.equals("putQueryParam")) {
       ImmutableList.Builder<Expr> paramsPutArgs = ImmutableList.builder();
 
@@ -1023,6 +1028,20 @@ private Expr createFieldsExtractorClassInstance(
         .build();
   }
 
+  @VisibleForTesting
+  String getBindingFieldMethodName(
+      HttpBinding httpBindingField, int descendantFieldsLengths, int index, String currFieldName) {
+    if (index == descendantFieldsLengths - 1) {
+      if (httpBindingField.isRepeated()) {
+        return String.format("get%sList", currFieldName);
+      }
+      if (httpBindingField.isEnum()) {
+        return String.format("get%sValue", currFieldName);
+      }
+    }
+    return String.format("get%s", currFieldName);
+  }
+
   private List<Expr> getHttpMethodTypeExpr(Method protoMethod) {
     return Collections.singletonList(
         ValueExpr.withValue(

src/main/java/com/google/api/generator/gapic/model/HttpBindings.java

@@ -36,21 +36,54 @@ public enum HttpVerb {
 
   @AutoValue
   public abstract static class HttpBinding implements Comparable<HttpBinding> {
+
+    // The fully qualified name of the field. e.g. request.complex_object.another_object.name
     public abstract String name();
 
     abstract String lowerCamelName();
 
-    public abstract boolean isOptional();
+    // An object that contains all info of the leaf level field
+    @Nullable
+    public abstract Field field();
 
-    public abstract boolean isRepeated();
+    public boolean isOptional() {
+      return field() != null && field().isProto3Optional();
+    }
+
+    public boolean isRepeated() {
+      return field() != null && field().isRepeated();
+    }
+
+    public boolean isEnum() {
+      return field() != null && field().isEnum();
+    }
 
     @Nullable
     public abstract String valuePattern();
 
-    public static HttpBinding create(
-        String name, boolean isOptional, boolean isRepeated, String valuePattern) {
-      return new AutoValue_HttpBindings_HttpBinding(
-          name, JavaStyle.toLowerCamelCase(name), isOptional, isRepeated, valuePattern);
+    public static HttpBindings.HttpBinding.Builder builder() {
+      return new AutoValue_HttpBindings_HttpBinding.Builder();
+    }
+
+    @AutoValue.Builder
+    public abstract static class Builder {
+
+      public abstract HttpBindings.HttpBinding.Builder setName(String name);
+
+      public abstract HttpBindings.HttpBinding.Builder setField(Field field);
+
+      abstract HttpBindings.HttpBinding.Builder setLowerCamelName(String lowerCamelName);
+
+      public abstract HttpBindings.HttpBinding.Builder setValuePattern(String valuePattern);
+
+      abstract String name();
+
+      abstract HttpBindings.HttpBinding autoBuild();
+
+      public HttpBindings.HttpBinding build() {
+        setLowerCamelName(JavaStyle.toLowerCamelCase(name()));
+        return autoBuild();
+      }
     }
 
     // Do not forget to keep it in sync with equals() implementation.

src/main/java/com/google/api/generator/gapic/protoparser/HttpRuleParser.java

@@ -82,6 +82,11 @@ private static HttpBindings parseHttpRuleHelper(
     Map<String, String> patternSampleValues = constructPathValuePatterns(pattern);
 
     // TODO: support nested message fields bindings
+    // Nested message fields bindings for query params are already supported as part of
+    // https://github.com/googleapis/gax-java/pull/1784,
+    // however we need to excludes fields that are already configured for path params and body, see
+    // https://github.com/googleapis/googleapis/blob/532289228eaebe77c42438f74b8a5afa85fee1b6/google/api/http.proto#L208 for details,
+    // the current logic does not exclude fields that are more than one level deep.
     String body = httpRule.getBody();
     Set<String> bodyParamNames;
     Set<String> queryParamNames;
@@ -133,8 +138,9 @@ private static Set<HttpBinding> validateAndConstructHttpBindings(
       String patternSampleValue =
           patternSampleValues != null ? patternSampleValues.get(paramName) : null;
       String[] subFields = paramName.split("\\.");
+      HttpBinding.Builder httpBindingBuilder = HttpBinding.builder().setName(paramName);
       if (inputMessage == null) {
-        httpBindings.add(HttpBinding.create(paramName, false, false, patternSampleValue));
+        httpBindings.add(httpBindingBuilder.setValuePattern(patternSampleValue).build());
         continue;
       }
       Message nestedMessage = inputMessage;
@@ -156,8 +162,7 @@ private static Set<HttpBinding> validateAndConstructHttpBindings(
           }
           Field field = nestedMessage.fieldMap().get(subFieldName);
           httpBindings.add(
-              HttpBinding.create(
-                  paramName, field.isProto3Optional(), field.isRepeated(), patternSampleValue));
+              httpBindingBuilder.setValuePattern(patternSampleValue).setField(field).build());
         }
       }
     }

src/test/java/com/google/api/generator/gapic/composer/rest/HttpJsonServiceStubClassComposerTest.java

@@ -14,23 +14,35 @@
 
 package com.google.api.generator.gapic.composer.rest;
 
+import com.google.api.generator.engine.ast.TypeNode;
 import com.google.api.generator.engine.writer.JavaWriterVisitor;
+import com.google.api.generator.gapic.model.Field;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicContext;
+import com.google.api.generator.gapic.model.HttpBindings.HttpBinding;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.test.framework.Assert;
 import com.google.api.generator.test.framework.Utils;
+import com.google.common.truth.Truth;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import org.junit.Before;
 import org.junit.Test;
 
 public class HttpJsonServiceStubClassComposerTest {
+
+  private HttpJsonServiceStubClassComposer composer;
+
+  @Before
+  public void setUp() throws Exception {
+    composer = HttpJsonServiceStubClassComposer.instance();
+  }
+
   @Test
   public void generateServiceClasses() {
     GapicContext context = RestTestProtoLoader.instance().parseCompliance();
     Service echoProtoService = context.services().get(0);
-    GapicClass clazz =
-        HttpJsonServiceStubClassComposer.instance().generate(context, echoProtoService);
+    GapicClass clazz = composer.generate(context, echoProtoService);
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
@@ -39,4 +51,49 @@ public void generateServiceClasses() {
         Paths.get(Utils.getGoldenDir(this.getClass()), "HttpJsonComplianceStub.golden");
     Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
+
+  @Test
+  public void
+      getBindingFieldMethodName_shouldReturnGetFieldListIfTheFieldIsInLastPositionAndIsRepeated() {
+    Field field =
+        Field.builder()
+            .setIsRepeated(true)
+            .setName("doesNotMatter")
+            .setType(TypeNode.OBJECT)
+            .build();
+    HttpBinding httpBinding =
+        HttpBinding.builder().setField(field).setName("doesNotMatter").build();
+    String actual = composer.getBindingFieldMethodName(httpBinding, 4, 3, "Values");
+    Truth.assertThat(actual).isEqualTo("getValuesList");
+  }
+
+  @Test
+  public void
+      getBindingFieldMethodName_shouldReturnGetFieldValueIfTheFieldIsInLastPositionAndIsEnum() {
+    Field field =
+        Field.builder().setIsEnum(true).setName("doesNotMatter").setType(TypeNode.OBJECT).build();
+    HttpBinding httpBinding =
+        HttpBinding.builder().setField(field).setName("doesNotMatter").build();
+    String actual = composer.getBindingFieldMethodName(httpBinding, 4, 3, "Enums");
+    Truth.assertThat(actual).isEqualTo("getEnumsValue");
+  }
+
+  @Test
+  public void
+      getBindingFieldMethodName_shouldReturnGetFieldIfTheFieldIsInLastPositionAndNotRepeatedOrEnum() {
+    Field field = Field.builder().setName("doesNotMatter").setType(TypeNode.OBJECT).build();
+    HttpBinding httpBinding =
+        HttpBinding.builder().setField(field).setName("doesNotMatter").build();
+    String actual = composer.getBindingFieldMethodName(httpBinding, 4, 3, "Value");
+    Truth.assertThat(actual).isEqualTo("getValue");
+  }
+
+  @Test
+  public void getBindingFieldMethodName_shouldReturnGetFieldIfTheFieldIsNotInLastPosition() {
+    Field field = Field.builder().setName("doesNotMatter").setType(TypeNode.OBJECT).build();
+    HttpBinding httpBinding =
+        HttpBinding.builder().setField(field).setName("doesNotMatter").build();
+    String actual = composer.getBindingFieldMethodName(httpBinding, 4, 1, "Value");
+    Truth.assertThat(actual).isEqualTo("getValue");
+  }
 }

src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceClientTest.golden

@@ -560,4 +560,102 @@ public class ComplianceClientTest {
       // Expected exception.
     }
   }
+
+  @Test
+  public void getEnumTest() throws Exception {
+    EnumResponse expectedResponse =
+        EnumResponse.newBuilder()
+            .setRequest(EnumRequest.newBuilder().build())
+            .setContinent(Continent.forNumber(0))
+            .build();
+    mockService.addResponse(expectedResponse);
+
+    EnumRequest request = EnumRequest.newBuilder().setUnknownEnum(true).build();
+
+    EnumResponse actualResponse = client.getEnum(request);
+    Assert.assertEquals(expectedResponse, actualResponse);
+
+    List<String> actualRequests = mockService.getRequestPaths();
+    Assert.assertEquals(1, actualRequests.size());
+
+    String apiClientHeaderKey =
+        mockService
+            .getRequestHeaders()
+            .get(ApiClientHeaderProvider.getDefaultApiClientHeaderKey())
+            .iterator()
+            .next();
+    Assert.assertTrue(
+        GaxHttpJsonProperties.getDefaultApiClientHeaderPattern()
+            .matcher(apiClientHeaderKey)
+            .matches());
+  }
+
+  @Test
+  public void getEnumExceptionTest() throws Exception {
+    ApiException exception =
+        ApiExceptionFactory.createException(
+            new Exception(), FakeStatusCode.of(StatusCode.Code.INVALID_ARGUMENT), false);
+    mockService.addException(exception);
+
+    try {
+      EnumRequest request = EnumRequest.newBuilder().setUnknownEnum(true).build();
+      client.getEnum(request);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+
+  @Test
+  public void verifyEnumTest() throws Exception {
+    EnumResponse expectedResponse =
+        EnumResponse.newBuilder()
+            .setRequest(EnumRequest.newBuilder().build())
+            .setContinent(Continent.forNumber(0))
+            .build();
+    mockService.addResponse(expectedResponse);
+
+    EnumResponse request =
+        EnumResponse.newBuilder()
+            .setRequest(EnumRequest.newBuilder().build())
+            .setContinent(Continent.forNumber(0))
+            .build();
+
+    EnumResponse actualResponse = client.verifyEnum(request);
+    Assert.assertEquals(expectedResponse, actualResponse);
+
+    List<String> actualRequests = mockService.getRequestPaths();
+    Assert.assertEquals(1, actualRequests.size());
+
+    String apiClientHeaderKey =
+        mockService
+            .getRequestHeaders()
+            .get(ApiClientHeaderProvider.getDefaultApiClientHeaderKey())
+            .iterator()
+            .next();
+    Assert.assertTrue(
+        GaxHttpJsonProperties.getDefaultApiClientHeaderPattern()
+            .matcher(apiClientHeaderKey)
+            .matches());
+  }
+
+  @Test
+  public void verifyEnumExceptionTest() throws Exception {
+    ApiException exception =
+        ApiExceptionFactory.createException(
+            new Exception(), FakeStatusCode.of(StatusCode.Code.INVALID_ARGUMENT), false);
+    mockService.addException(exception);
+
+    try {
+      EnumResponse request =
+          EnumResponse.newBuilder()
+              .setRequest(EnumRequest.newBuilder().build())
+              .setContinent(Continent.forNumber(0))
+              .build();
+      client.verifyEnum(request);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
 }

src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceSettings.golden

@@ -86,6 +86,16 @@ public class ComplianceSettings extends ClientSettings<ComplianceSettings> {
     return ((ComplianceStubSettings) getStubSettings()).repeatDataPathTrailingResourceSettings();
   }
 
+  /** Returns the object with the settings used for calls to getEnum. */
+  public UnaryCallSettings<EnumRequest, EnumResponse> getEnumSettings() {
+    return ((ComplianceStubSettings) getStubSettings()).getEnumSettings();
+  }
+
+  /** Returns the object with the settings used for calls to verifyEnum. */
+  public UnaryCallSettings<EnumResponse, EnumResponse> verifyEnumSettings() {
+    return ((ComplianceStubSettings) getStubSettings()).verifyEnumSettings();
+  }
+
   public static final ComplianceSettings create(ComplianceStubSettings stub) throws IOException {
     return new ComplianceSettings.Builder(stub.toBuilder()).build();
   }
@@ -215,6 +225,16 @@ public class ComplianceSettings extends ClientSettings<ComplianceSettings> {
       return getStubSettingsBuilder().repeatDataPathTrailingResourceSettings();
     }
 
+    /** Returns the builder for the settings used for calls to getEnum. */
+    public UnaryCallSettings.Builder<EnumRequest, EnumResponse> getEnumSettings() {
+      return getStubSettingsBuilder().getEnumSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to verifyEnum. */
+    public UnaryCallSettings.Builder<EnumResponse, EnumResponse> verifyEnumSettings() {
+      return getStubSettingsBuilder().verifyEnumSettings();
+    }
+
     @Override
     public ComplianceSettings build() throws IOException {
       return new ComplianceSettings(this);