Examples with Expr com.google.api.generator.engine.ast.Expr used on opensource projects

Example 46 with Expr

use of com.google.api.generator.engine.ast.Expr in project gapic-generator-java by googleapis.

the class ServiceClientCallableMethodSampleComposer method composeStreamCallableMethod.

public static Sample composeStreamCallableMethod(Method method, TypeNode clientType, Map<String, ResourceName> resourceNames, Map<String, Message> messageTypes) {
    VariableExpr clientVarExpr = VariableExpr.withVariable(Variable.builder().setName(JavaStyle.toLowerCamelCase(clientType.reference().name())).setType(clientType).build());
    // Assign method's request variable with the default value.
    VariableExpr requestVarExpr = VariableExpr.withVariable(Variable.builder().setName("request").setType(method.inputType()).build());
    Message requestMessage = messageTypes.get(method.inputType().reference().fullName());
    Preconditions.checkNotNull(requestMessage, String.format("Could not find the message type %s.", method.inputType().reference().fullName()));
    Expr requestBuilderExpr = DefaultValueComposer.createSimpleMessageBuilderValue(requestMessage, resourceNames, messageTypes);
    AssignmentExpr requestAssignmentExpr = AssignmentExpr.builder().setVariableExpr(requestVarExpr.toBuilder().setIsDecl(true).build()).setValueExpr(requestBuilderExpr).build();
    RegionTag regionTag = null;
    List<Statement> bodyStatements = new ArrayList<>();
    if (method.stream().equals(Method.Stream.SERVER)) {
        // e.g. ServerStream<EchoResponse> stream = echoClient.expandCallable().call(request);
        Sample streamServer = composeStreamServerSample(method, clientVarExpr, requestAssignmentExpr);
        bodyStatements.addAll(streamServer.body());
        regionTag = streamServer.regionTag();
    } else if (method.stream().equals(Method.Stream.BIDI)) {
        // e.g. echoClient.collect().clientStreamingCall(responseObserver);
        Sample streamBidi = composeStreamBidiSample(method, clientVarExpr, requestAssignmentExpr);
        bodyStatements.addAll(streamBidi.body());
        regionTag = streamBidi.regionTag();
    } else if (method.stream().equals(Method.Stream.CLIENT)) {
        Sample streamClient = composeStreamClientSample(method, clientVarExpr, requestAssignmentExpr);
        bodyStatements.addAll(streamClient.body());
        regionTag = streamClient.regionTag();
    }
    List<Statement> body = Arrays.asList(TryCatchStatement.builder().setTryResourceExpr(SampleComposerUtil.assignClientVariableWithCreateMethodExpr(clientVarExpr)).setTryBody(bodyStatements).setIsSampleCode(true).build());
    return Sample.builder().setBody(body).setRegionTag(regionTag).build();
}

Example 47 with Expr

use of com.google.api.generator.engine.ast.Expr in project gapic-generator-java by googleapis.

the class ServiceClientCallableMethodSampleComposer method composeStreamBidiSample.

private static Sample composeStreamBidiSample(Method method, VariableExpr clientVarExpr, AssignmentExpr requestAssignmentExpr) {
    List<Expr> bodyExprs = new ArrayList<>();
    // Create bidi stream variable expression and assign it with invoking client's bidi stream
    // method.
    // e.g. BidiStream<EchoRequest, EchoResponse> bidiStream = echoClient.chatCallable().call();
    TypeNode bidiStreamType = TypeNode.withReference(ConcreteReference.builder().setClazz(BidiStream.class).setGenerics(method.inputType().reference(), method.outputType().reference()).build());
    VariableExpr bidiStreamVarExpr = VariableExpr.withVariable(Variable.builder().setName("bidiStream").setType(bidiStreamType).build());
    MethodInvocationExpr clientBidiStreamCallMethodInvoationExpr = MethodInvocationExpr.builder().setExprReferenceExpr(clientVarExpr).setMethodName(JavaStyle.toLowerCamelCase(String.format("%sCallable", method.name()))).build();
    clientBidiStreamCallMethodInvoationExpr = MethodInvocationExpr.builder().setExprReferenceExpr(clientBidiStreamCallMethodInvoationExpr).setMethodName("call").setReturnType(bidiStreamType).build();
    AssignmentExpr bidiStreamAssignmentExpr = AssignmentExpr.builder().setVariableExpr(bidiStreamVarExpr.toBuilder().setIsDecl(true).build()).setValueExpr(clientBidiStreamCallMethodInvoationExpr).build();
    bodyExprs.add(bidiStreamAssignmentExpr);
    // Add request with default value expression.
    bodyExprs.add(requestAssignmentExpr);
    // Invoke send method with argument request.
    // e.g. bidiStream.send(request);
    MethodInvocationExpr sendMethodInvocationExpr = MethodInvocationExpr.builder().setExprReferenceExpr(bidiStreamVarExpr).setArguments(requestAssignmentExpr.variableExpr().toBuilder().setIsDecl(false).build()).setMethodName("send").build();
    bodyExprs.add(sendMethodInvocationExpr);
    List<Statement> bodyStatements = bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList());
    // For-loop on bidi stream variable.
    // e.g. for (EchoResponse response : bidiStream) {
    // // Do something when reveive a response.
    // }
    ForStatement forStatement = ForStatement.builder().setLocalVariableExpr(VariableExpr.builder().setVariable(Variable.builder().setType(method.outputType()).setName("response").build()).setIsDecl(true).build()).setCollectionExpr(bidiStreamVarExpr).setBody(Arrays.asList(CommentStatement.withComment(LineComment.withComment("Do something when a response is received.")))).build();
    bodyStatements.add(forStatement);
    RegionTag regionTag = RegionTag.builder().setServiceName(clientVarExpr.variable().identifier().name()).setRpcName(method.name()).setIsAsynchronous(true).build();
    return Sample.builder().setBody(bodyStatements).setRegionTag(regionTag).build();
}

Example 48 with Expr

use of com.google.api.generator.engine.ast.Expr in project gapic-generator-java by googleapis.

the class ServiceClientHeaderSampleComposer method composeTransportSample.

public static Sample composeTransportSample(TypeNode clientType, TypeNode settingsType, String transportProviderMethod) {
    String settingsName = JavaStyle.toLowerCamelCase(settingsType.reference().name());
    String clientName = JavaStyle.toLowerCamelCase(clientType.reference().name());
    VariableExpr settingsVarExpr = VariableExpr.withVariable(Variable.builder().setName(settingsName).setType(settingsType).build());
    MethodInvocationExpr newBuilderMethodExpr = MethodInvocationExpr.builder().setStaticReferenceType(settingsType).setMethodName("newBuilder").build();
    MethodInvocationExpr transportChannelProviderArg = MethodInvocationExpr.builder().setExprReferenceExpr(MethodInvocationExpr.builder().setStaticReferenceType(settingsType).setMethodName(transportProviderMethod).build()).setMethodName("build").build();
    MethodInvocationExpr credentialsMethodExpr = MethodInvocationExpr.builder().setExprReferenceExpr(newBuilderMethodExpr).setArguments(transportChannelProviderArg).setMethodName("setTransportChannelProvider").build();
    MethodInvocationExpr buildMethodExpr = MethodInvocationExpr.builder().setExprReferenceExpr(credentialsMethodExpr).setReturnType(settingsType).setMethodName("build").build();
    Expr initSettingsVarExpr = AssignmentExpr.builder().setVariableExpr(settingsVarExpr.toBuilder().setIsDecl(true).build()).setValueExpr(buildMethodExpr).build();
    // Initialized client with create() method.
    // e.g. EchoClient echoClient = EchoClient.create(echoSettings);
    VariableExpr clientVarExpr = VariableExpr.withVariable(Variable.builder().setName(clientName).setType(clientType).build());
    MethodInvocationExpr createMethodExpr = MethodInvocationExpr.builder().setStaticReferenceType(clientType).setArguments(settingsVarExpr).setMethodName("create").setReturnType(clientType).build();
    String rpcName = createMethodExpr.methodIdentifier().name();
    Expr initClientVarExpr = AssignmentExpr.builder().setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build()).setValueExpr(createMethodExpr).build();
    List<Statement> sampleBody = Arrays.asList(ExprStatement.withExpr(initSettingsVarExpr), ExprStatement.withExpr(initClientVarExpr));
    RegionTag regionTag = RegionTag.builder().setServiceName(clientName).setRpcName(rpcName).setOverloadDisambiguation("setCredentialsProvider").build();
    return Sample.builder().setBody(sampleBody).setRegionTag(regionTag).build();
}

Example 49 with Expr

use of com.google.api.generator.engine.ast.Expr in project gapic-generator-java by googleapis.

the class ServiceClientHeaderSampleComposer method composeSetEndpointSample.

public static Sample composeSetEndpointSample(TypeNode clientType, TypeNode settingsType) {
    // Initialize client settings with builder() method.
    // e.g. EchoSettings echoSettings = EchoSettings.newBuilder().setEndpoint("myEndpoint").build();
    String settingsName = JavaStyle.toLowerCamelCase(settingsType.reference().name());
    String clientName = JavaStyle.toLowerCamelCase(clientType.reference().name());
    TypeNode myEndpointType = TypeNode.withReference(VaporReference.builder().setName("myEndpoint").setPakkage(clientType.reference().pakkage()).build());
    VariableExpr settingsVarExpr = VariableExpr.withVariable(Variable.builder().setName(settingsName).setType(settingsType).build());
    MethodInvocationExpr newBuilderMethodExpr = MethodInvocationExpr.builder().setStaticReferenceType(settingsType).setMethodName("newBuilder").build();
    MethodInvocationExpr credentialsMethodExpr = MethodInvocationExpr.builder().setExprReferenceExpr(newBuilderMethodExpr).setArguments(VariableExpr.withVariable(Variable.builder().setName("myEndpoint").setType(myEndpointType).build())).setMethodName("setEndpoint").build();
    MethodInvocationExpr buildMethodExpr = MethodInvocationExpr.builder().setExprReferenceExpr(credentialsMethodExpr).setReturnType(settingsType).setMethodName("build").build();
    Expr initSettingsVarExpr = AssignmentExpr.builder().setVariableExpr(settingsVarExpr.toBuilder().setIsDecl(true).build()).setValueExpr(buildMethodExpr).build();
    // Initialize client with create() method.
    // e.g. EchoClient echoClient = EchoClient.create(echoSettings);
    VariableExpr clientVarExpr = VariableExpr.withVariable(Variable.builder().setName(clientName).setType(clientType).build());
    MethodInvocationExpr createMethodExpr = MethodInvocationExpr.builder().setStaticReferenceType(clientType).setArguments(settingsVarExpr).setMethodName("create").setReturnType(clientType).build();
    String rpcName = createMethodExpr.methodIdentifier().name();
    Expr initClientVarExpr = AssignmentExpr.builder().setVariableExpr(clientVarExpr.toBuilder().setIsDecl(true).build()).setValueExpr(createMethodExpr).build();
    RegionTag regionTag = RegionTag.builder().setServiceName(clientName).setRpcName(rpcName).setOverloadDisambiguation("setEndpoint").build();
    List<Statement> sampleBody = Arrays.asList(ExprStatement.withExpr(initSettingsVarExpr), ExprStatement.withExpr(initClientVarExpr));
    return Sample.builder().setBody(sampleBody).setRegionTag(regionTag).build();
}

Example 50 with Expr

use of com.google.api.generator.engine.ast.Expr in project gapic-generator-java by googleapis.

the class ServiceClientMethodSampleComposer method composeLroSample.

static Sample composeLroSample(Method method, VariableExpr clientVarExpr, List<VariableExpr> rpcMethodArgVarExprs, List<Expr> bodyExprs) {
    // Assign response variable with invoking client's LRO method.
    // e.g. if return void, echoClient.waitAsync(ttl).get(); or,
    // e.g. if return other type, WaitResponse response = echoClient.waitAsync(ttl).get();
    MethodInvocationExpr invokeLroGetMethodExpr = MethodInvocationExpr.builder().setExprReferenceExpr(clientVarExpr).setMethodName(String.format("%sAsync", JavaStyle.toLowerCamelCase(method.name()))).setArguments(rpcMethodArgVarExprs.stream().map(e -> (Expr) e).collect(Collectors.toList())).build();
    invokeLroGetMethodExpr = MethodInvocationExpr.builder().setExprReferenceExpr(invokeLroGetMethodExpr).setMethodName("get").setReturnType(method.lro().responseType()).build();
    boolean returnsVoid = method.lro().responseType().isProtoEmptyType();
    if (returnsVoid) {
        bodyExprs.add(invokeLroGetMethodExpr);
    } else {
        VariableExpr responseVarExpr = VariableExpr.builder().setVariable(Variable.builder().setName("response").setType(method.lro().responseType()).build()).setIsDecl(true).build();
        bodyExprs.add(AssignmentExpr.builder().setVariableExpr(responseVarExpr).setValueExpr(invokeLroGetMethodExpr).build());
    }
    RegionTag regionTag = RegionTag.builder().setServiceName(clientVarExpr.variable().identifier().name()).setRpcName(method.name()).setOverloadDisambiguation(SampleComposerUtil.createOverloadDisambiguation(rpcMethodArgVarExprs)).build();
    return Sample.builder().setBody(bodyExprs.stream().map(e -> ExprStatement.withExpr(e)).collect(Collectors.toList())).setRegionTag(regionTag).build();
}