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aws_sdk_iotmanagedintegrations/operation/
list_schema_versions.rs

1// Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.
2/// Orchestration and serialization glue logic for `ListSchemaVersions`.
3#[derive(::std::clone::Clone, ::std::default::Default, ::std::fmt::Debug)]
4#[non_exhaustive]
5pub struct ListSchemaVersions;
6impl ListSchemaVersions {
7    /// Creates a new `ListSchemaVersions`
8    pub fn new() -> Self {
9        Self
10    }
11    pub(crate) async fn orchestrate(
12        runtime_plugins: &::aws_smithy_runtime_api::client::runtime_plugin::RuntimePlugins,
13        input: crate::operation::list_schema_versions::ListSchemaVersionsInput,
14    ) -> ::std::result::Result<
15        crate::operation::list_schema_versions::ListSchemaVersionsOutput,
16        ::aws_smithy_runtime_api::client::result::SdkError<
17            crate::operation::list_schema_versions::ListSchemaVersionsError,
18            ::aws_smithy_runtime_api::client::orchestrator::HttpResponse,
19        >,
20    > {
21        let map_err = |err: ::aws_smithy_runtime_api::client::result::SdkError<
22            ::aws_smithy_runtime_api::client::interceptors::context::Error,
23            ::aws_smithy_runtime_api::client::orchestrator::HttpResponse,
24        >| {
25            err.map_service_error(|err| {
26                err.downcast::<crate::operation::list_schema_versions::ListSchemaVersionsError>()
27                    .expect("correct error type")
28            })
29        };
30        let context = Self::orchestrate_with_stop_point(runtime_plugins, input, ::aws_smithy_runtime::client::orchestrator::StopPoint::None)
31            .await
32            .map_err(map_err)?;
33        let output = context.finalize().map_err(map_err)?;
34        ::std::result::Result::Ok(
35            output
36                .downcast::<crate::operation::list_schema_versions::ListSchemaVersionsOutput>()
37                .expect("correct output type"),
38        )
39    }
40
41    pub(crate) async fn orchestrate_with_stop_point(
42        runtime_plugins: &::aws_smithy_runtime_api::client::runtime_plugin::RuntimePlugins,
43        input: crate::operation::list_schema_versions::ListSchemaVersionsInput,
44        stop_point: ::aws_smithy_runtime::client::orchestrator::StopPoint,
45    ) -> ::std::result::Result<
46        ::aws_smithy_runtime_api::client::interceptors::context::InterceptorContext,
47        ::aws_smithy_runtime_api::client::result::SdkError<
48            ::aws_smithy_runtime_api::client::interceptors::context::Error,
49            ::aws_smithy_runtime_api::client::orchestrator::HttpResponse,
50        >,
51    > {
52        let input = ::aws_smithy_runtime_api::client::interceptors::context::Input::erase(input);
53        use ::tracing::Instrument;
54        ::aws_smithy_runtime::client::orchestrator::invoke_with_stop_point(
55            "IoT Managed Integrations",
56            "ListSchemaVersions",
57            input,
58            runtime_plugins,
59            stop_point,
60        )
61        // Create a parent span for the entire operation. Includes a random, internal-only,
62        // seven-digit ID for the operation orchestration so that it can be correlated in the logs.
63        .instrument(::tracing::debug_span!(
64            "IoT Managed Integrations.ListSchemaVersions",
65            "rpc.service" = "IoT Managed Integrations",
66            "rpc.method" = "ListSchemaVersions",
67            "sdk_invocation_id" = ::fastrand::u32(1_000_000..10_000_000),
68            "rpc.system" = "aws-api",
69        ))
70        .await
71    }
72
73    pub(crate) fn operation_runtime_plugins(
74        client_runtime_plugins: ::aws_smithy_runtime_api::client::runtime_plugin::RuntimePlugins,
75        client_config: &crate::config::Config,
76        config_override: ::std::option::Option<crate::config::Builder>,
77    ) -> ::aws_smithy_runtime_api::client::runtime_plugin::RuntimePlugins {
78        let mut runtime_plugins = client_runtime_plugins.with_operation_plugin(Self::new());
79
80        if let ::std::option::Option::Some(config_override) = config_override {
81            for plugin in config_override.runtime_plugins.iter().cloned() {
82                runtime_plugins = runtime_plugins.with_operation_plugin(plugin);
83            }
84            runtime_plugins = runtime_plugins.with_operation_plugin(crate::config::ConfigOverrideRuntimePlugin::new(
85                config_override,
86                client_config.config.clone(),
87                &client_config.runtime_components,
88            ));
89        }
90        runtime_plugins
91    }
92}
93impl ::aws_smithy_runtime_api::client::runtime_plugin::RuntimePlugin for ListSchemaVersions {
94    fn config(&self) -> ::std::option::Option<::aws_smithy_types::config_bag::FrozenLayer> {
95        let mut cfg = ::aws_smithy_types::config_bag::Layer::new("ListSchemaVersions");
96
97        cfg.store_put(::aws_smithy_runtime_api::client::ser_de::SharedRequestSerializer::new(
98            ListSchemaVersionsRequestSerializer,
99        ));
100        cfg.store_put(::aws_smithy_runtime_api::client::ser_de::SharedResponseDeserializer::new(
101            ListSchemaVersionsResponseDeserializer,
102        ));
103
104        cfg.store_put(::aws_smithy_runtime_api::client::auth::AuthSchemeOptionResolverParams::new(
105            crate::config::auth::Params::builder()
106                .operation_name("ListSchemaVersions")
107                .build()
108                .expect("required fields set"),
109        ));
110
111        cfg.store_put(::aws_smithy_runtime_api::client::orchestrator::Metadata::new(
112            "ListSchemaVersions",
113            "IoT Managed Integrations",
114        ));
115        let mut signing_options = ::aws_runtime::auth::SigningOptions::default();
116        signing_options.double_uri_encode = true;
117        signing_options.content_sha256_header = false;
118        signing_options.normalize_uri_path = true;
119        signing_options.payload_override = None;
120
121        cfg.store_put(::aws_runtime::auth::SigV4OperationSigningConfig {
122            signing_options,
123            ..::std::default::Default::default()
124        });
125
126        ::std::option::Option::Some(cfg.freeze())
127    }
128
129    fn runtime_components(
130        &self,
131        _: &::aws_smithy_runtime_api::client::runtime_components::RuntimeComponentsBuilder,
132    ) -> ::std::borrow::Cow<'_, ::aws_smithy_runtime_api::client::runtime_components::RuntimeComponentsBuilder> {
133        #[allow(unused_mut)]
134        let mut rcb = ::aws_smithy_runtime_api::client::runtime_components::RuntimeComponentsBuilder::new("ListSchemaVersions")
135            .with_interceptor(::aws_smithy_runtime_api::client::interceptors::SharedInterceptor::permanent(
136                ::aws_smithy_runtime::client::stalled_stream_protection::StalledStreamProtectionInterceptor::default(),
137            ))
138            .with_interceptor(::aws_smithy_runtime_api::client::interceptors::SharedInterceptor::permanent(
139                ListSchemaVersionsEndpointParamsInterceptor,
140            ))
141            .with_retry_classifier(::aws_smithy_runtime::client::retries::classifiers::TransientErrorClassifier::<
142                crate::operation::list_schema_versions::ListSchemaVersionsError,
143            >::new())
144            .with_retry_classifier(::aws_smithy_runtime::client::retries::classifiers::ModeledAsRetryableClassifier::<
145                crate::operation::list_schema_versions::ListSchemaVersionsError,
146            >::new())
147            .with_retry_classifier(::aws_runtime::retries::classifiers::AwsErrorCodeClassifier::<
148                crate::operation::list_schema_versions::ListSchemaVersionsError,
149            >::new());
150
151        ::std::borrow::Cow::Owned(rcb)
152    }
153}
154
155#[derive(Debug)]
156struct ListSchemaVersionsResponseDeserializer;
157impl ::aws_smithy_runtime_api::client::ser_de::DeserializeResponse for ListSchemaVersionsResponseDeserializer {
158    fn deserialize_nonstreaming(
159        &self,
160        response: &::aws_smithy_runtime_api::client::orchestrator::HttpResponse,
161    ) -> ::aws_smithy_runtime_api::client::interceptors::context::OutputOrError {
162        let (success, status) = (response.status().is_success(), response.status().as_u16());
163        let headers = response.headers();
164        let body = response.body().bytes().expect("body loaded");
165        #[allow(unused_mut)]
166        let mut force_error = false;
167        ::tracing::debug!(request_id = ?::aws_types::request_id::RequestId::request_id(response));
168        let parse_result = if !success && status != 200 || force_error {
169            crate::protocol_serde::shape_list_schema_versions::de_list_schema_versions_http_error(status, headers, body)
170        } else {
171            crate::protocol_serde::shape_list_schema_versions::de_list_schema_versions_http_response(status, headers, body)
172        };
173        crate::protocol_serde::type_erase_result(parse_result)
174    }
175}
176#[derive(Debug)]
177struct ListSchemaVersionsRequestSerializer;
178impl ::aws_smithy_runtime_api::client::ser_de::SerializeRequest for ListSchemaVersionsRequestSerializer {
179    #[allow(unused_mut, clippy::let_and_return, clippy::needless_borrow, clippy::useless_conversion)]
180    fn serialize_input(
181        &self,
182        input: ::aws_smithy_runtime_api::client::interceptors::context::Input,
183        _cfg: &mut ::aws_smithy_types::config_bag::ConfigBag,
184    ) -> ::std::result::Result<::aws_smithy_runtime_api::client::orchestrator::HttpRequest, ::aws_smithy_runtime_api::box_error::BoxError> {
185        let input = input
186            .downcast::<crate::operation::list_schema_versions::ListSchemaVersionsInput>()
187            .expect("correct type");
188        let _header_serialization_settings = _cfg
189            .load::<crate::serialization_settings::HeaderSerializationSettings>()
190            .cloned()
191            .unwrap_or_default();
192        let mut request_builder = {
193            #[allow(clippy::uninlined_format_args)]
194            fn uri_base(
195                _input: &crate::operation::list_schema_versions::ListSchemaVersionsInput,
196                output: &mut ::std::string::String,
197            ) -> ::std::result::Result<(), ::aws_smithy_types::error::operation::BuildError> {
198                use ::std::fmt::Write as _;
199                let input_1 = &_input.r#type;
200                let input_1 = input_1
201                    .as_ref()
202                    .ok_or_else(|| ::aws_smithy_types::error::operation::BuildError::missing_field("r#type", "cannot be empty or unset"))?;
203                let r#type = ::aws_smithy_http::label::fmt_string(input_1.as_str(), ::aws_smithy_http::label::EncodingStrategy::Default);
204                if r#type.is_empty() {
205                    return ::std::result::Result::Err(::aws_smithy_types::error::operation::BuildError::missing_field(
206                        "r#type",
207                        "cannot be empty or unset",
208                    ));
209                }
210                ::std::write!(output, "/schema-versions/{Type}", Type = r#type).expect("formatting should succeed");
211                ::std::result::Result::Ok(())
212            }
213            fn uri_query(
214                _input: &crate::operation::list_schema_versions::ListSchemaVersionsInput,
215                mut output: &mut ::std::string::String,
216            ) -> ::std::result::Result<(), ::aws_smithy_types::error::operation::BuildError> {
217                let mut query = ::aws_smithy_http::query::Writer::new(output);
218                if let ::std::option::Option::Some(inner_2) = &_input.max_results {
219                    {
220                        query.push_kv("MaxResults", ::aws_smithy_types::primitive::Encoder::from(*inner_2).encode());
221                    }
222                }
223                if let ::std::option::Option::Some(inner_3) = &_input.next_token {
224                    {
225                        query.push_kv("NextToken", &::aws_smithy_http::query::fmt_string(inner_3));
226                    }
227                }
228                if let ::std::option::Option::Some(inner_4) = &_input.schema_id {
229                    {
230                        query.push_kv("SchemaIdFilter", &::aws_smithy_http::query::fmt_string(inner_4));
231                    }
232                }
233                if let ::std::option::Option::Some(inner_5) = &_input.namespace {
234                    {
235                        query.push_kv("NamespaceFilter", &::aws_smithy_http::query::fmt_string(inner_5));
236                    }
237                }
238                if let ::std::option::Option::Some(inner_6) = &_input.visibility {
239                    {
240                        query.push_kv("VisibilityFilter", &::aws_smithy_http::query::fmt_string(inner_6.as_str()));
241                    }
242                }
243                if let ::std::option::Option::Some(inner_7) = &_input.semantic_version {
244                    {
245                        query.push_kv("SemanticVersionFilter", &::aws_smithy_http::query::fmt_string(inner_7));
246                    }
247                }
248                ::std::result::Result::Ok(())
249            }
250            #[allow(clippy::unnecessary_wraps)]
251            fn update_http_builder(
252                input: &crate::operation::list_schema_versions::ListSchemaVersionsInput,
253                builder: ::http_1x::request::Builder,
254            ) -> ::std::result::Result<::http_1x::request::Builder, ::aws_smithy_types::error::operation::BuildError> {
255                let mut uri = ::std::string::String::new();
256                uri_base(input, &mut uri)?;
257                uri_query(input, &mut uri)?;
258                ::std::result::Result::Ok(builder.method("GET").uri(uri))
259            }
260            let mut builder = update_http_builder(&input, ::http_1x::request::Builder::new())?;
261            builder
262        };
263        let body = ::aws_smithy_types::body::SdkBody::from("");
264
265        ::std::result::Result::Ok(request_builder.body(body).expect("valid request").try_into().unwrap())
266    }
267}
268#[derive(Debug)]
269struct ListSchemaVersionsEndpointParamsInterceptor;
270
271#[::aws_smithy_runtime_api::client::interceptors::dyn_dispatch_hint]
272impl ::aws_smithy_runtime_api::client::interceptors::Intercept for ListSchemaVersionsEndpointParamsInterceptor {
273    fn name(&self) -> &'static str {
274        "ListSchemaVersionsEndpointParamsInterceptor"
275    }
276
277    fn read_before_execution(
278        &self,
279        context: &::aws_smithy_runtime_api::client::interceptors::context::BeforeSerializationInterceptorContextRef<
280            '_,
281            ::aws_smithy_runtime_api::client::interceptors::context::Input,
282            ::aws_smithy_runtime_api::client::interceptors::context::Output,
283            ::aws_smithy_runtime_api::client::interceptors::context::Error,
284        >,
285        cfg: &mut ::aws_smithy_types::config_bag::ConfigBag,
286    ) -> ::std::result::Result<(), ::aws_smithy_runtime_api::box_error::BoxError> {
287        let _input = context
288            .input()
289            .downcast_ref::<ListSchemaVersionsInput>()
290            .ok_or("failed to downcast to ListSchemaVersionsInput")?;
291
292        let params = crate::config::endpoint::Params::builder()
293            .set_use_fips(cfg.load::<::aws_types::endpoint_config::UseFips>().map(|ty| ty.0))
294            .set_endpoint(cfg.load::<::aws_types::endpoint_config::EndpointUrl>().map(|ty| ty.0.clone()))
295            .set_region(cfg.load::<::aws_types::region::Region>().map(|r| r.as_ref().to_owned()))
296            .build()
297            .map_err(|err| {
298                ::aws_smithy_runtime_api::client::interceptors::error::ContextAttachedError::new("endpoint params could not be built", err)
299            })?;
300        cfg.interceptor_state()
301            .store_put(::aws_smithy_runtime_api::client::endpoint::EndpointResolverParams::new(params));
302        ::std::result::Result::Ok(())
303    }
304}
305
306// The get_* functions below are generated from JMESPath expressions in the
307// operationContextParams trait. They target the operation's input shape.
308
309/// Error type for the `ListSchemaVersionsError` operation.
310#[non_exhaustive]
311#[derive(::std::fmt::Debug)]
312pub enum ListSchemaVersionsError {
313    /// <p>User is not authorized.</p>
314    AccessDeniedException(crate::types::error::AccessDeniedException),
315    /// <p>There is a conflict with the request.</p>
316    ConflictException(crate::types::error::ConflictException),
317    /// <p>Internal error from the service that indicates an unexpected error or that the service is unavailable.</p>
318    InternalServerException(crate::types::error::InternalServerException),
319    /// <p>The service is temporarily unavailable.</p>
320    ServiceUnavailableException(crate::types::error::ServiceUnavailableException),
321    /// <p>The rate exceeds the limit.</p>
322    ThrottlingException(crate::types::error::ThrottlingException),
323    /// <p>A validation error occurred when performing the API request.</p>
324    ValidationException(crate::types::error::ValidationException),
325    /// An unexpected error occurred (e.g., invalid JSON returned by the service or an unknown error code).
326    #[deprecated(note = "Matching `Unhandled` directly is not forwards compatible. Instead, match using a \
327    variable wildcard pattern and check `.code()`:
328     \
329    &nbsp;&nbsp;&nbsp;`err if err.code() == Some(\"SpecificExceptionCode\") => { /* handle the error */ }`
330     \
331    See [`ProvideErrorMetadata`](#impl-ProvideErrorMetadata-for-ListSchemaVersionsError) for what information is available for the error.")]
332    Unhandled(crate::error::sealed_unhandled::Unhandled),
333}
334impl ListSchemaVersionsError {
335    /// Creates the `ListSchemaVersionsError::Unhandled` variant from any error type.
336    pub fn unhandled(
337        err: impl ::std::convert::Into<::std::boxed::Box<dyn ::std::error::Error + ::std::marker::Send + ::std::marker::Sync + 'static>>,
338    ) -> Self {
339        Self::Unhandled(crate::error::sealed_unhandled::Unhandled {
340            source: err.into(),
341            meta: ::std::default::Default::default(),
342        })
343    }
344
345    /// Creates the `ListSchemaVersionsError::Unhandled` variant from an [`ErrorMetadata`](::aws_smithy_types::error::ErrorMetadata).
346    pub fn generic(err: ::aws_smithy_types::error::ErrorMetadata) -> Self {
347        Self::Unhandled(crate::error::sealed_unhandled::Unhandled {
348            source: err.clone().into(),
349            meta: err,
350        })
351    }
352    ///
353    /// Returns error metadata, which includes the error code, message,
354    /// request ID, and potentially additional information.
355    ///
356    pub fn meta(&self) -> &::aws_smithy_types::error::ErrorMetadata {
357        match self {
358            Self::AccessDeniedException(e) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(e),
359            Self::ConflictException(e) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(e),
360            Self::InternalServerException(e) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(e),
361            Self::ServiceUnavailableException(e) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(e),
362            Self::ThrottlingException(e) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(e),
363            Self::ValidationException(e) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(e),
364            Self::Unhandled(e) => &e.meta,
365        }
366    }
367    /// Returns `true` if the error kind is `ListSchemaVersionsError::AccessDeniedException`.
368    pub fn is_access_denied_exception(&self) -> bool {
369        matches!(self, Self::AccessDeniedException(_))
370    }
371    /// Returns `true` if the error kind is `ListSchemaVersionsError::ConflictException`.
372    pub fn is_conflict_exception(&self) -> bool {
373        matches!(self, Self::ConflictException(_))
374    }
375    /// Returns `true` if the error kind is `ListSchemaVersionsError::InternalServerException`.
376    pub fn is_internal_server_exception(&self) -> bool {
377        matches!(self, Self::InternalServerException(_))
378    }
379    /// Returns `true` if the error kind is `ListSchemaVersionsError::ServiceUnavailableException`.
380    pub fn is_service_unavailable_exception(&self) -> bool {
381        matches!(self, Self::ServiceUnavailableException(_))
382    }
383    /// Returns `true` if the error kind is `ListSchemaVersionsError::ThrottlingException`.
384    pub fn is_throttling_exception(&self) -> bool {
385        matches!(self, Self::ThrottlingException(_))
386    }
387    /// Returns `true` if the error kind is `ListSchemaVersionsError::ValidationException`.
388    pub fn is_validation_exception(&self) -> bool {
389        matches!(self, Self::ValidationException(_))
390    }
391}
392impl ::std::error::Error for ListSchemaVersionsError {
393    fn source(&self) -> ::std::option::Option<&(dyn ::std::error::Error + 'static)> {
394        match self {
395            Self::AccessDeniedException(_inner) => ::std::option::Option::Some(_inner),
396            Self::ConflictException(_inner) => ::std::option::Option::Some(_inner),
397            Self::InternalServerException(_inner) => ::std::option::Option::Some(_inner),
398            Self::ServiceUnavailableException(_inner) => ::std::option::Option::Some(_inner),
399            Self::ThrottlingException(_inner) => ::std::option::Option::Some(_inner),
400            Self::ValidationException(_inner) => ::std::option::Option::Some(_inner),
401            Self::Unhandled(_inner) => ::std::option::Option::Some(&*_inner.source),
402        }
403    }
404}
405impl ::std::fmt::Display for ListSchemaVersionsError {
406    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
407        match self {
408            Self::AccessDeniedException(_inner) => _inner.fmt(f),
409            Self::ConflictException(_inner) => _inner.fmt(f),
410            Self::InternalServerException(_inner) => _inner.fmt(f),
411            Self::ServiceUnavailableException(_inner) => _inner.fmt(f),
412            Self::ThrottlingException(_inner) => _inner.fmt(f),
413            Self::ValidationException(_inner) => _inner.fmt(f),
414            Self::Unhandled(_inner) => {
415                if let ::std::option::Option::Some(code) = ::aws_smithy_types::error::metadata::ProvideErrorMetadata::code(self) {
416                    write!(f, "unhandled error ({code})")
417                } else {
418                    f.write_str("unhandled error")
419                }
420            }
421        }
422    }
423}
424impl ::aws_smithy_types::retry::ProvideErrorKind for ListSchemaVersionsError {
425    fn code(&self) -> ::std::option::Option<&str> {
426        ::aws_smithy_types::error::metadata::ProvideErrorMetadata::code(self)
427    }
428    fn retryable_error_kind(&self) -> ::std::option::Option<::aws_smithy_types::retry::ErrorKind> {
429        ::std::option::Option::None
430    }
431}
432impl ::aws_smithy_types::error::metadata::ProvideErrorMetadata for ListSchemaVersionsError {
433    fn meta(&self) -> &::aws_smithy_types::error::ErrorMetadata {
434        match self {
435            Self::AccessDeniedException(_inner) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(_inner),
436            Self::ConflictException(_inner) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(_inner),
437            Self::InternalServerException(_inner) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(_inner),
438            Self::ServiceUnavailableException(_inner) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(_inner),
439            Self::ThrottlingException(_inner) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(_inner),
440            Self::ValidationException(_inner) => ::aws_smithy_types::error::metadata::ProvideErrorMetadata::meta(_inner),
441            Self::Unhandled(_inner) => &_inner.meta,
442        }
443    }
444}
445impl ::aws_smithy_runtime_api::client::result::CreateUnhandledError for ListSchemaVersionsError {
446    fn create_unhandled_error(
447        source: ::std::boxed::Box<dyn ::std::error::Error + ::std::marker::Send + ::std::marker::Sync + 'static>,
448        meta: ::std::option::Option<::aws_smithy_types::error::ErrorMetadata>,
449    ) -> Self {
450        Self::Unhandled(crate::error::sealed_unhandled::Unhandled {
451            source,
452            meta: meta.unwrap_or_default(),
453        })
454    }
455}
456impl ::aws_types::request_id::RequestId for crate::operation::list_schema_versions::ListSchemaVersionsError {
457    fn request_id(&self) -> Option<&str> {
458        self.meta().request_id()
459    }
460}
461
462pub use crate::operation::list_schema_versions::_list_schema_versions_input::ListSchemaVersionsInput;
463
464pub use crate::operation::list_schema_versions::_list_schema_versions_output::ListSchemaVersionsOutput;
465
466mod _list_schema_versions_input;
467
468mod _list_schema_versions_output;
469
470/// Builders
471pub mod builders;
472
473/// Paginator for this operation
474pub mod paginator;