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HttpJsonServiceStubClassComposer.java
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HttpJsonServiceStubClassComposer.java
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.api.generator.gapic.composer.rest;
import com.google.api.client.http.HttpMethods;
import com.google.api.core.InternalApi;
import com.google.api.gax.httpjson.ApiMethodDescriptor;
import com.google.api.gax.httpjson.FieldsExtractor;
import com.google.api.gax.httpjson.HttpJsonCallSettings;
import com.google.api.gax.httpjson.HttpJsonLongRunningClient;
import com.google.api.gax.httpjson.HttpJsonOperationSnapshot;
import com.google.api.gax.httpjson.HttpJsonStubCallableFactory;
import com.google.api.gax.httpjson.ProtoMessageRequestFormatter;
import com.google.api.gax.httpjson.ProtoMessageResponseParser;
import com.google.api.gax.httpjson.ProtoRestSerializer;
import com.google.api.gax.httpjson.longrunning.stub.HttpJsonOperationsStub;
import com.google.api.gax.longrunning.OperationSnapshot;
import com.google.api.gax.rpc.LongRunningClient;
import com.google.api.gax.rpc.UnaryCallable;
import com.google.api.generator.engine.ast.AnnotationNode;
import com.google.api.generator.engine.ast.AssignmentExpr;
import com.google.api.generator.engine.ast.ConcreteReference;
import com.google.api.generator.engine.ast.EnumRefExpr;
import com.google.api.generator.engine.ast.Expr;
import com.google.api.generator.engine.ast.ExprStatement;
import com.google.api.generator.engine.ast.IfStatement;
import com.google.api.generator.engine.ast.LambdaExpr;
import com.google.api.generator.engine.ast.MethodDefinition;
import com.google.api.generator.engine.ast.MethodInvocationExpr;
import com.google.api.generator.engine.ast.NewObjectExpr;
import com.google.api.generator.engine.ast.PrimitiveValue;
import com.google.api.generator.engine.ast.ScopeNode;
import com.google.api.generator.engine.ast.Statement;
import com.google.api.generator.engine.ast.StringObjectValue;
import com.google.api.generator.engine.ast.ThisObjectValue;
import com.google.api.generator.engine.ast.TypeNode;
import com.google.api.generator.engine.ast.ValueExpr;
import com.google.api.generator.engine.ast.VaporReference;
import com.google.api.generator.engine.ast.Variable;
import com.google.api.generator.engine.ast.VariableExpr;
import com.google.api.generator.gapic.composer.common.AbstractTransportServiceStubClassComposer;
import com.google.api.generator.gapic.composer.store.TypeStore;
import com.google.api.generator.gapic.model.HttpBindings.HttpBinding;
import com.google.api.generator.gapic.model.Message;
import com.google.api.generator.gapic.model.Method;
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.collect.BiMap;
import com.google.common.collect.ImmutableList;
import com.google.protobuf.TypeRegistry;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.stream.Collectors;
public class HttpJsonServiceStubClassComposer extends AbstractTransportServiceStubClassComposer {
private static final HttpJsonServiceStubClassComposer INSTANCE =
new HttpJsonServiceStubClassComposer();
private static final TypeStore FIXED_REST_TYPESTORE = createStaticTypes();
private static final VariableExpr TYPE_REGISTRY_VAR_EXPR =
VariableExpr.builder()
.setVariable(
Variable.builder()
.setName("typeRegistry")
.setType(FIXED_REST_TYPESTORE.get(TypeRegistry.class.getSimpleName()))
.build())
.build();
protected HttpJsonServiceStubClassComposer() {
super(RestContext.instance());
}
public static HttpJsonServiceStubClassComposer instance() {
return INSTANCE;
}
private static TypeStore createStaticTypes() {
return new TypeStore(
Arrays.asList(
ApiMethodDescriptor.class,
ArrayList.class,
FieldsExtractor.class,
InternalApi.class,
HashMap.class,
HttpJsonCallSettings.class,
HttpJsonOperationSnapshot.class,
HttpJsonStubCallableFactory.class,
Map.class,
ProtoMessageRequestFormatter.class,
ProtoMessageResponseParser.class,
ProtoRestSerializer.class,
TypeRegistry.class));
}
@Override
protected boolean generateOperationsStubLogic(Service service) {
return service.hasLroMethods();
}
@Override
protected Statement createMethodDescriptorVariableDecl(
Service service,
Method protoMethod,
VariableExpr methodDescriptorVarExpr,
Map<String, Message> messageTypes) {
MethodInvocationExpr expr =
MethodInvocationExpr.builder()
.setMethodName("newBuilder")
.setStaticReferenceType(
FIXED_REST_TYPESTORE.get(ApiMethodDescriptor.class.getSimpleName()))
.setGenerics(methodDescriptorVarExpr.variable().type().reference().generics())
.build();
BiFunction<String, List<Expr>, Function<MethodInvocationExpr, MethodInvocationExpr>>
methodMaker = getMethodMaker();
String codeMethodArgName = getProtoRpcFullMethodName(service, protoMethod);
expr =
methodMaker
.apply(
"setFullMethodName",
Arrays.asList(ValueExpr.withValue(StringObjectValue.withValue(codeMethodArgName))))
.apply(expr);
expr = methodMaker.apply("setHttpMethod", getHttpMethodTypeExpr(protoMethod)).apply(expr);
expr =
methodMaker.apply("setRequestFormatter", getRequestFormatterExpr(protoMethod)).apply(expr);
expr = methodMaker.apply("setResponseParser", setResponseParserExpr(protoMethod)).apply(expr);
if (protoMethod.isOperationPollingMethod() || protoMethod.hasLro()) {
expr =
methodMaker
.apply(
"setOperationSnapshotFactory",
setOperationSnapshotFactoryExpr(protoMethod, messageTypes))
.apply(expr);
}
if (protoMethod.isOperationPollingMethod()) {
expr =
methodMaker
.apply(
"setPollingRequestFactory",
setPollingRequestFactoryExpr(protoMethod, messageTypes))
.apply(expr);
}
expr =
MethodInvocationExpr.builder()
.setMethodName("build")
.setExprReferenceExpr(expr)
.setReturnType(methodDescriptorVarExpr.type())
.build();
return ExprStatement.withExpr(
AssignmentExpr.builder()
.setVariableExpr(
methodDescriptorVarExpr
.toBuilder()
.setIsDecl(true)
.setScope(ScopeNode.PRIVATE)
.setIsStatic(true)
.setIsFinal(true)
.build())
.setValueExpr(expr)
.build());
}
@Override
protected List<MethodDefinition> createOperationsStubGetterMethod(
Service service, VariableExpr operationsStubVarExpr) {
if (!service.hasStandardLroMethods()) {
return Collections.emptyList();
}
return super.createOperationsStubGetterMethod(service, operationsStubVarExpr);
}
@Override
protected Expr createTransportSettingsInitExpr(
Method method, VariableExpr transportSettingsVarExpr, VariableExpr methodDescriptorVarExpr) {
MethodInvocationExpr callSettingsBuilderExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(
FIXED_REST_TYPESTORE.get(HttpJsonCallSettings.class.getSimpleName()))
.setGenerics(transportSettingsVarExpr.type().reference().generics())
.setMethodName("newBuilder")
.build();
callSettingsBuilderExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(callSettingsBuilderExpr)
.setMethodName("setMethodDescriptor")
.setArguments(Arrays.asList(methodDescriptorVarExpr))
.build();
callSettingsBuilderExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(callSettingsBuilderExpr)
.setMethodName("setTypeRegistry")
.setArguments(Arrays.asList(TYPE_REGISTRY_VAR_EXPR))
.build();
callSettingsBuilderExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(callSettingsBuilderExpr)
.setMethodName("build")
.setReturnType(transportSettingsVarExpr.type())
.build();
return AssignmentExpr.builder()
.setVariableExpr(transportSettingsVarExpr.toBuilder().setIsDecl(true).build())
.setValueExpr(callSettingsBuilderExpr)
.build();
}
@Override
protected List<AnnotationNode> createClassAnnotations(Service service) {
List<AnnotationNode> annotations = super.createClassAnnotations(service);
annotations.add(
AnnotationNode.builder()
.setType(FIXED_TYPESTORE.get("BetaApi"))
.setDescription(
"A restructuring of stub classes is planned, so this may break in the future")
.build());
return annotations;
}
@Override
protected List<MethodDefinition> createGetMethodDescriptorsMethod(
Service service,
TypeStore typeStore,
Map<String, VariableExpr> protoMethodNameToDescriptorVarExprs) {
List<Expr> bodyExprs = new ArrayList<>();
VariableExpr methodDescriptorsVarExpr =
VariableExpr.withVariable(
Variable.builder()
.setType(
TypeNode.withReference(
ConcreteReference.builder()
.setClazz(List.class)
.setGenerics(
Arrays.asList(
FIXED_REST_TYPESTORE.get("ApiMethodDescriptor").reference()))
.build()))
.setName("methodDescriptors")
.build());
bodyExprs.add(
AssignmentExpr.builder()
.setVariableExpr(methodDescriptorsVarExpr.toBuilder().setIsDecl(true).build())
.setValueExpr(
NewObjectExpr.builder()
.setType(FIXED_REST_TYPESTORE.get("ArrayList"))
.setIsGeneric(true)
.build())
.build());
for (VariableExpr methodDescriptorVarExpr : protoMethodNameToDescriptorVarExprs.values()) {
bodyExprs.add(
MethodInvocationExpr.builder()
.setExprReferenceExpr(methodDescriptorsVarExpr)
.setMethodName("add")
.setArguments(methodDescriptorVarExpr)
.build());
}
return Arrays.asList(
MethodDefinition.builder()
.setScope(ScopeNode.PUBLIC)
.setIsStatic(true)
.setReturnType(methodDescriptorsVarExpr.type())
.setReturnExpr(methodDescriptorsVarExpr)
.setAnnotations(
Arrays.asList(AnnotationNode.withType(FIXED_REST_TYPESTORE.get("InternalApi"))))
.setName("getMethodDescriptors")
.setBody(bodyExprs.stream().map(ExprStatement::withExpr).collect(Collectors.toList()))
.build());
}
private BiFunction<String, List<Expr>, Function<MethodInvocationExpr, MethodInvocationExpr>>
getMethodMaker() {
return (mName, argExpr) ->
(m) ->
MethodInvocationExpr.builder()
.setMethodName(mName)
.setArguments(argExpr)
.setExprReferenceExpr(m)
.build();
}
private List<Expr> getRequestFormatterExpr(Method protoMethod) {
BiFunction<String, List<Expr>, Function<MethodInvocationExpr, MethodInvocationExpr>>
methodMaker = getMethodMaker();
MethodInvocationExpr expr =
MethodInvocationExpr.builder()
.setStaticReferenceType(
FIXED_REST_TYPESTORE.get(ProtoMessageRequestFormatter.class.getSimpleName()))
.setMethodName("newBuilder")
.setGenerics(Collections.singletonList(protoMethod.inputType().reference()))
.build();
TypeNode extractorVarType =
TypeNode.withReference(
ConcreteReference.builder()
.setClazz(Map.class)
.setGenerics(TypeNode.STRING.reference(), TypeNode.STRING.reference())
.build());
expr =
methodMaker
.apply(
"setPath",
Arrays.asList(
ValueExpr.withValue(
StringObjectValue.withValue(
protoMethod.httpBindings().patternLowerCamel())),
createFieldsExtractorClassInstance(
protoMethod,
extractorVarType,
protoMethod.httpBindings().pathParameters(),
"putPathParam")))
.apply(expr);
TypeNode fieldsVarGenericType =
TypeNode.withReference(
ConcreteReference.builder()
.setClazz(List.class)
.setGenerics(TypeNode.STRING.reference())
.build());
extractorVarType =
TypeNode.withReference(
ConcreteReference.builder()
.setClazz(Map.class)
.setGenerics(TypeNode.STRING.reference(), fieldsVarGenericType.reference())
.build());
expr =
methodMaker
.apply(
"setQueryParamsExtractor",
Arrays.asList(
createFieldsExtractorClassInstance(
protoMethod,
extractorVarType,
protoMethod.httpBindings().queryParameters(),
"putQueryParam")))
.apply(expr);
extractorVarType = TypeNode.STRING;
boolean asteriskBody = protoMethod.httpBindings().isAsteriskBody();
expr =
methodMaker
.apply(
"setRequestBodyExtractor",
Arrays.asList(
createBodyFieldsExtractorClassInstance(
protoMethod,
extractorVarType,
asteriskBody
? protoMethod.httpBindings().pathParameters()
: protoMethod.httpBindings().bodyParameters(),
"toBody",
asteriskBody)))
.apply(expr);
expr = methodMaker.apply("build", Collections.emptyList()).apply(expr);
return Collections.singletonList(expr);
}
private List<Expr> setResponseParserExpr(Method protoMethod) {
BiFunction<String, List<Expr>, Function<MethodInvocationExpr, MethodInvocationExpr>>
methodMaker = getMethodMaker();
MethodInvocationExpr expr =
MethodInvocationExpr.builder()
.setStaticReferenceType(
FIXED_REST_TYPESTORE.get(ProtoMessageResponseParser.class.getSimpleName()))
.setMethodName("newBuilder")
.setGenerics(Collections.singletonList(protoMethod.outputType().reference()))
// .setArguments(Arrays.asList(m))
.build();
expr =
methodMaker
.apply(
"setDefaultInstance",
Arrays.asList(
MethodInvocationExpr.builder()
.setStaticReferenceType(protoMethod.outputType())
.setMethodName("getDefaultInstance")
.setReturnType(protoMethod.outputType())
.build()))
.apply(expr);
expr =
methodMaker
.apply("setDefaultTypeRegistry", Arrays.asList(TYPE_REGISTRY_VAR_EXPR))
.apply(expr);
expr = methodMaker.apply("build", Collections.emptyList()).apply(expr);
return Collections.singletonList(expr);
}
// Generates get[camelCase(fieldName)]
private String getMethodFormat(String fieldName) {
return "get" + JavaStyle.toUpperCamelCase(fieldName);
}
// Generates set[camelCase(fieldName)]
private String setMethodFormat(String fieldName) {
return "set" + JavaStyle.toUpperCamelCase(fieldName);
}
// Generates: [nameVar].append(":").append([requestVar].get[FieldName]());
private ExprStatement appendField(
VariableExpr nameVar, VariableExpr requestVar, String fieldName) {
BiFunction<String, List<Expr>, Function<MethodInvocationExpr, MethodInvocationExpr>>
methodMaker = getMethodMaker();
ValueExpr colonValueExpr =
ValueExpr.builder().setValue(StringObjectValue.builder().setValue(":").build()).build();
MethodInvocationExpr opNameAppendColonExpr =
MethodInvocationExpr.builder()
.setMethodName("append")
.setArguments(colonValueExpr)
.setExprReferenceExpr(nameVar)
.build();
MethodInvocationExpr getField =
MethodInvocationExpr.builder()
.setExprReferenceExpr(requestVar)
.setMethodName(getMethodFormat(fieldName))
.build();
opNameAppendColonExpr =
methodMaker
.apply("append", Collections.singletonList(getField))
.apply(opNameAppendColonExpr);
return ExprStatement.withExpr(opNameAppendColonExpr);
}
// returns var.get(num);
private MethodInvocationExpr getExpr(VariableExpr var, String num) {
return MethodInvocationExpr.builder()
.setExprReferenceExpr(var)
.setMethodName("get")
.setArguments(
ValueExpr.builder()
.setValue(PrimitiveValue.builder().setValue(num).setType(TypeNode.INT).build())
.build())
.build();
}
private List<Expr> setOperationSnapshotFactoryExpr(
Method protoMethod, Map<String, Message> messageTypes) {
// Generate input variables for create()
VariableExpr requestVarExpr =
VariableExpr.withVariable(
Variable.builder().setType(protoMethod.inputType()).setName("request").build());
VariableExpr responseVarExpr =
VariableExpr.withVariable(
Variable.builder().setType(protoMethod.outputType()).setName("response").build());
MethodInvocationExpr buildExpr;
List<Statement> createBody = new ArrayList<>(4);
TypeNode httpJsonOperationSnapshotType =
FIXED_REST_TYPESTORE.get(HttpJsonOperationSnapshot.class.getSimpleName());
TypeNode operationSnapshotType = FIXED_TYPESTORE.get(OperationSnapshot.class.getSimpleName());
Message inputOperationMessage =
messageTypes.get(protoMethod.inputType().reference().fullName());
Message outputOperationMessage =
messageTypes.get(protoMethod.outputType().reference().fullName());
OperationResponse operationResponse = outputOperationMessage.operationResponse();
if (operationResponse == null) {
// AIP-151 LRO
// HttpJsonOperationSnapshot.create(response)
buildExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(httpJsonOperationSnapshotType)
.setMethodName("create")
.setArguments(responseVarExpr)
.setReturnType(operationSnapshotType)
.build();
} else {
BiFunction<String, List<Expr>, Function<MethodInvocationExpr, MethodInvocationExpr>>
methodMaker = getMethodMaker();
// Generate opName
TypeNode stringBuilderType =
TypeNode.withReference(ConcreteReference.withClazz(StringBuilder.class));
VariableExpr opNameVarExpr =
VariableExpr.withVariable(
Variable.builder().setType(stringBuilderType).setName("opName").build());
MethodInvocationExpr getId =
MethodInvocationExpr.builder()
.setExprReferenceExpr(responseVarExpr)
.setMethodName(getMethodFormat(operationResponse.nameFieldName()))
.build();
Expr opNameObjectExpr =
NewObjectExpr.builder().setType(stringBuilderType).setArguments(getId).build();
AssignmentExpr opNameAssignExpr =
AssignmentExpr.builder()
.setVariableExpr(opNameVarExpr.toBuilder().setIsDecl(true).build())
.setValueExpr(opNameObjectExpr)
.build();
createBody.add(ExprStatement.withExpr(opNameAssignExpr));
// Generate compound operation name
if (!protoMethod.isOperationPollingMethod()) {
// TODO: Change to ordered map
Map<String, String> requestFields = inputOperationMessage.operationRequestFields();
List<String> fieldAnnotationNames = new ArrayList<>(requestFields.keySet());
Collections.sort(fieldAnnotationNames);
for (String fieldName : fieldAnnotationNames) {
createBody.add(appendField(opNameVarExpr, requestVarExpr, requestFields.get(fieldName)));
}
}
// Generate check for status == done
MethodInvocationExpr getStatusExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(responseVarExpr)
.setMethodName(getMethodFormat(operationResponse.statusFieldName()))
.build();
String statusTypeName = operationResponse.statusFieldTypeName();
String statusClassName = statusTypeName.substring(statusTypeName.lastIndexOf('.') + 1);
TypeNode opType =
protoMethod.hasLro() ? protoMethod.lro().responseType() : protoMethod.outputType();
TypeNode statusType =
TypeNode.withReference(
VaporReference.builder()
.setName(statusClassName)
.setPakkage(opType.reference().fullName())
.setIsStaticImport(false)
.build());
VariableExpr statusDoneExpr =
VariableExpr.builder()
.setVariable(Variable.builder().setName("DONE").setType(TypeNode.INT).build())
.setStaticReferenceType(statusType)
.build();
MethodInvocationExpr statusEqualsExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(statusDoneExpr)
.setMethodName("equals")
.setArguments(getStatusExpr)
.build();
// Generate return statement
// Generate getter methods from annotations
MethodInvocationExpr opNameToStringExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(opNameVarExpr)
.setMethodName("toString")
.build();
MethodInvocationExpr getHttpErrorStatusCodeExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(responseVarExpr)
.setMethodName(getMethodFormat(operationResponse.errorCodeFieldName()))
.build();
MethodInvocationExpr getHttpErrorMessageExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(responseVarExpr)
.setMethodName(getMethodFormat(operationResponse.errorMessageFieldName()))
.build();
MethodInvocationExpr newBuilderExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(httpJsonOperationSnapshotType)
.setMethodName("newBuilder")
.build();
newBuilderExpr =
methodMaker
.apply("setName", Collections.singletonList(opNameToStringExpr))
.apply(newBuilderExpr);
newBuilderExpr =
methodMaker
.apply("setMetadata", Collections.singletonList(responseVarExpr))
.apply(newBuilderExpr);
newBuilderExpr =
methodMaker
.apply("setDone", Collections.singletonList(statusEqualsExpr))
.apply(newBuilderExpr);
newBuilderExpr =
methodMaker
.apply("setResponse", Collections.singletonList(responseVarExpr))
.apply(newBuilderExpr);
newBuilderExpr =
methodMaker
.apply("setError", Arrays.asList(getHttpErrorStatusCodeExpr, getHttpErrorMessageExpr))
.apply(newBuilderExpr);
buildExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(newBuilderExpr)
.setMethodName("build")
.setReturnType(operationSnapshotType)
.build();
}
// Generate lambda anonymous class
return Collections.singletonList(
LambdaExpr.builder()
.setArguments(
requestVarExpr.toBuilder().setIsDecl(true).build(),
responseVarExpr.toBuilder().setIsDecl(true).build())
.setBody(createBody)
.setReturnExpr(buildExpr)
.build());
}
private List<Expr> setPollingRequestFactoryExpr(
Method protoMethod, Map<String, Message> messageTypes) {
BiFunction<String, List<Expr>, Function<MethodInvocationExpr, MethodInvocationExpr>>
methodMaker = getMethodMaker();
Message inputOperationMessage =
messageTypes.get(protoMethod.inputType().reference().fullName());
List<Statement> createBody = new ArrayList<>(1);
// Generate input variables for create
VariableExpr compoundOperationIdVarExpr =
VariableExpr.builder()
.setVariable(
Variable.builder().setType(TypeNode.STRING).setName("compoundOperationId").build())
.build();
// Generate idComponenets
TypeNode listStringType =
TypeNode.withReference(
ConcreteReference.builder()
.setClazz(List.class)
.setGenerics(ConcreteReference.withClazz(String.class))
.build());
TypeNode arrayListStringType =
TypeNode.withReference(
ConcreteReference.builder()
.setClazz(ArrayList.class)
.setGenerics(ConcreteReference.withClazz(String.class))
.build());
TypeNode arraysType = TypeNode.withReference(ConcreteReference.withClazz(Arrays.class));
VariableExpr idComponentsVarExpr =
VariableExpr.withVariable(
Variable.builder().setName("idComponents").setType(listStringType).build());
MethodInvocationExpr compoundOperationIdSplitExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(compoundOperationIdVarExpr)
.setMethodName("split")
.setArguments(ValueExpr.withValue(StringObjectValue.withValue(":")))
.setReturnType(arrayListStringType)
.build();
MethodInvocationExpr asListExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(arraysType)
.setMethodName("asList")
.setArguments(compoundOperationIdSplitExpr)
.setReturnType(arrayListStringType)
.build();
AssignmentExpr idComponentsAssignExpr =
AssignmentExpr.builder()
.setVariableExpr(idComponentsVarExpr.toBuilder().setIsDecl(true).build())
.setValueExpr(asListExpr)
.build();
createBody.add(ExprStatement.withExpr(idComponentsAssignExpr));
// Generate return statement
TypeNode getOperationRequestType = TypeNode.withReference(protoMethod.inputType().reference());
MethodInvocationExpr newBuilderExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(getOperationRequestType)
.setMethodName("newBuilder")
.build();
BiMap<String, String> responseFieldsMap = inputOperationMessage.operationResponseFields();
List<String> responseFieldAnnotationNames = new ArrayList<>(responseFieldsMap.keySet());
Collections.sort(responseFieldAnnotationNames);
Set<String> responseFieldsNames = responseFieldsMap.inverse().keySet();
Set<String> allFieldsNames = inputOperationMessage.fieldMap().keySet();
ArrayList<String> nonResponseFieldsNames = new ArrayList<>();
for (String fieldName : allFieldsNames) {
if (!responseFieldsNames.contains(fieldName)) {
nonResponseFieldsNames.add(fieldName);
}
}
Collections.sort(nonResponseFieldsNames);
int index = 0;
for (String fieldAnnotationName : responseFieldAnnotationNames) {
newBuilderExpr =
methodMaker
.apply(
setMethodFormat(responseFieldsMap.get(fieldAnnotationName)),
Collections.singletonList(getExpr(idComponentsVarExpr, Integer.toString(index))))
.apply(newBuilderExpr);
index++;
}
for (String fieldName : nonResponseFieldsNames) {
newBuilderExpr =
methodMaker
.apply(
setMethodFormat(fieldName),
Collections.singletonList(getExpr(idComponentsVarExpr, Integer.toString(index))))
.apply(newBuilderExpr);
index++;
}
MethodInvocationExpr buildExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(newBuilderExpr)
.setMethodName("build")
.setReturnType(getOperationRequestType)
.build();
// Return lambda anonymous class
return Collections.singletonList(
LambdaExpr.builder()
.setArguments(compoundOperationIdVarExpr.toBuilder().setIsDecl(true).build())
.setBody(createBody)
.setReturnExpr(buildExpr)
.build());
}
private Expr createBodyFieldsExtractorClassInstance(
Method method,
TypeNode extractorReturnType,
Set<HttpBinding> httpBindingFieldNames,
String serializerMethodName,
boolean asteriskBody) {
List<Statement> bodyStatements = new ArrayList<>();
Expr returnExpr = null;
Expr serializerExpr =
MethodInvocationExpr.builder()
.setMethodName("create")
.setStaticReferenceType(
FIXED_REST_TYPESTORE.get(ProtoRestSerializer.class.getSimpleName()))
.build();
VariableExpr requestVarExpr =
VariableExpr.withVariable(
Variable.builder().setType(method.inputType()).setName("request").build());
Expr bodyRequestExpr = requestVarExpr;
String requestMethodPrefix = "get";
String bodyParamName = null;
if (asteriskBody) {
bodyRequestExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(requestVarExpr)
.setMethodName("toBuilder")
.build();
// In case of `body: "*"` case we send the whole request message as a body, minus the fields
// in the path, therefore the "clear" prefix here.
requestMethodPrefix = "clear";
}
Expr prevExpr = bodyRequestExpr;
for (HttpBinding httpBindingFieldName : httpBindingFieldNames) {
// Handle foo.bar cases by descending into the subfields.
MethodInvocationExpr.Builder requestFieldMethodExprBuilder =
MethodInvocationExpr.builder().setExprReferenceExpr(prevExpr);
bodyParamName = JavaStyle.toLowerCamelCase(httpBindingFieldName.name());
String[] descendantFields = httpBindingFieldName.name().split("\\.");
if (asteriskBody && descendantFields.length > 1) {
// This is the `body: "*"` case, do not clean nested body fields as it a very rare, not
// well-defined case, and it is generally safer to send more than less in such case.
continue;
}
for (int i = 0; i < descendantFields.length; i++) {
String currFieldName = descendantFields[i];
String bindingFieldMethodName =
String.format("%s%s", requestMethodPrefix, JavaStyle.toUpperCamelCase(currFieldName));
requestFieldMethodExprBuilder =
requestFieldMethodExprBuilder.setMethodName(bindingFieldMethodName);
if (i < descendantFields.length - 1) {
requestFieldMethodExprBuilder =
MethodInvocationExpr.builder()
.setExprReferenceExpr(requestFieldMethodExprBuilder.build());
}
}
prevExpr = requestFieldMethodExprBuilder.build();
}
if (httpBindingFieldNames.isEmpty() && !asteriskBody) {
returnExpr = ValueExpr.createNullExpr();
} else {
ImmutableList.Builder<Expr> paramsPutArgs = ImmutableList.builder();
if (asteriskBody) {
prevExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(prevExpr)
.setMethodName("build")
.build();
bodyParamName = "*";
}
paramsPutArgs.add(ValueExpr.withValue(StringObjectValue.withValue(bodyParamName)));
paramsPutArgs.add(prevExpr);
returnExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(serializerExpr)
.setMethodName(serializerMethodName)
.setArguments(paramsPutArgs.build())
.setReturnType(extractorReturnType)
.build();
}
// Overrides FieldsExtractor
// (https://github.com/googleapis/gax-java/blob/12b18ee255d3fabe13bb3969df40753b29f830d5/gax-httpjson/src/main/java/com/google/api/gax/httpjson/FieldsExtractor.java).
return LambdaExpr.builder()
.setArguments(requestVarExpr.toBuilder().setIsDecl(true).build())
.setBody(bodyStatements)
.setReturnExpr(returnExpr)
.build();
}
private Expr createFieldsExtractorClassInstance(
Method method,
TypeNode extractorReturnType,
Set<HttpBinding> httpBindingFieldNames,
String serializerMethodName) {
List<Statement> bodyStatements = new ArrayList<>();
VariableExpr fieldsVarExpr =
VariableExpr.withVariable(
Variable.builder().setName("fields").setType(extractorReturnType).build());
Expr fieldsAssignExpr =
AssignmentExpr.builder()
.setVariableExpr(fieldsVarExpr.toBuilder().setIsDecl(true).build())
.setValueExpr(
NewObjectExpr.builder()
.setType(FIXED_REST_TYPESTORE.get(HashMap.class.getSimpleName()))
.setIsGeneric(true)
.build())
.build();
bodyStatements.add(ExprStatement.withExpr(fieldsAssignExpr));
TypeNode serializerVarType =
TypeNode.withReference(
ConcreteReference.builder()
.setClazz(ProtoRestSerializer.class)
.setGenerics(method.inputType().reference())
.build());
VariableExpr serializerVarExpr =
VariableExpr.withVariable(
Variable.builder().setName("serializer").setType(serializerVarType).build());
Expr serializerAssignExpr =
AssignmentExpr.builder()
.setVariableExpr(serializerVarExpr.toBuilder().setIsDecl(true).build())
.setValueExpr(
MethodInvocationExpr.builder()
.setStaticReferenceType(
FIXED_REST_TYPESTORE.get(ProtoRestSerializer.class.getSimpleName()))
.setMethodName("create")
.setReturnType(serializerVarType)
.build())
.build();
bodyStatements.add(ExprStatement.withExpr(serializerAssignExpr));
VariableExpr requestVarExpr =
VariableExpr.withVariable(
Variable.builder().setType(method.inputType()).setName("request").build());
for (HttpBinding httpBindingFieldName : httpBindingFieldNames) {
// Handle foo.bar cases by descending into the subfields.
MethodInvocationExpr.Builder requestFieldGetterExprBuilder =
MethodInvocationExpr.builder().setExprReferenceExpr(requestVarExpr);
MethodInvocationExpr.Builder requestFieldHasExprBuilder =
MethodInvocationExpr.builder().setExprReferenceExpr(requestVarExpr);
String[] descendantFields = httpBindingFieldName.name().split("\\.");
for (int i = 0; i < descendantFields.length; i++) {
String currFieldName = descendantFields[i];
String bindingFieldMethodName =
String.format("get%s", JavaStyle.toUpperCamelCase(currFieldName));
requestFieldGetterExprBuilder =
requestFieldGetterExprBuilder.setMethodName(bindingFieldMethodName);
String bindingFieldHasMethodName =
(i < descendantFields.length - 1)
? bindingFieldMethodName
: String.format("has%s", JavaStyle.toUpperCamelCase(currFieldName));
requestFieldHasExprBuilder =
requestFieldHasExprBuilder
.setMethodName(bindingFieldHasMethodName)
.setReturnType(TypeNode.BOOLEAN);
if (i < descendantFields.length - 1) {
requestFieldGetterExprBuilder =
MethodInvocationExpr.builder()
.setExprReferenceExpr(requestFieldGetterExprBuilder.build());
requestFieldHasExprBuilder =
MethodInvocationExpr.builder()
.setExprReferenceExpr(requestFieldHasExprBuilder.build());
}
}
MethodInvocationExpr requestBuilderExpr = requestFieldGetterExprBuilder.build();
MethodInvocationExpr requestHasExpr = requestFieldHasExprBuilder.build();
ImmutableList.Builder<Expr> paramsPutArgs = ImmutableList.builder();
paramsPutArgs.add(fieldsVarExpr);
paramsPutArgs.add(
ValueExpr.withValue(
StringObjectValue.withValue(
JavaStyle.toLowerCamelCase(httpBindingFieldName.name()))));
paramsPutArgs.add(requestBuilderExpr);
Expr paramsPutExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(serializerVarExpr)
.setMethodName(serializerMethodName)
.setArguments(paramsPutArgs.build())
.setReturnType(extractorReturnType)
.build();
if (httpBindingFieldName.isOptional()) {
bodyStatements.add(
IfStatement.builder()
.setConditionExpr(requestHasExpr)
.setBody(Arrays.asList(ExprStatement.withExpr(paramsPutExpr)))
.build());
} else {
bodyStatements.add(ExprStatement.withExpr(paramsPutExpr));
}
}
// Overrides FieldsExtractor
// (https://github.com/googleapis/gax-java/blob/12b18ee255d3fabe13bb3969df40753b29f830d5/gax-httpjson/src/main/java/com/google/api/gax/httpjson/FieldsExtractor.java).
return LambdaExpr.builder()
.setArguments(requestVarExpr.toBuilder().setIsDecl(true).build())
.setBody(bodyStatements)
.setReturnExpr(fieldsVarExpr)
.build();
}
private List<Expr> getHttpMethodTypeExpr(Method protoMethod) {
EnumRefExpr expr =
EnumRefExpr.builder()
.setName(protoMethod.httpBindings().httpVerb().toString())
.setType(
TypeNode.withReference(
ConcreteReference.builder().setClazz(HttpMethods.class).build()))
.build();
return Collections.singletonList(expr);
}
@Override
protected List<Expr> createOperationsStubInitExpr(
Service service,
Expr thisExpr,
VariableExpr operationsStubClassVarExpr,
VariableExpr clientContextVarExpr,
VariableExpr callableFactoryVarExpr) {
TypeNode operationsStubType = getTransportOperationsStubType(service);
String standardOpStub = HttpJsonOperationsStub.class.getName();
List<Expr> arguments =
new ArrayList<>(Arrays.asList(clientContextVarExpr, callableFactoryVarExpr));
if (standardOpStub.equals(operationsStubType.reference().fullName())) {
arguments.add(TYPE_REGISTRY_VAR_EXPR);
}
return Collections.singletonList(
AssignmentExpr.builder()
.setVariableExpr(
operationsStubClassVarExpr.toBuilder().setExprReferenceExpr(thisExpr).build())
.setValueExpr(