Package org.springframework.graphql.data.query

Class QueryByExampleDataFetcher<T>

java.lang.Object

org.springframework.graphql.data.query.QueryByExampleDataFetcher<T>

Type Parameters:

T - returned result type

public abstract class QueryByExampleDataFetcher<T>
extends Object

Main class to create a DataFetcher from a Query By Example repository. To create an instance, use one of the following:

• builder(QueryByExampleExecutor)
• builder(ReactiveQueryByExampleExecutor)

For example:

 interface BookRepository extends
         Repository<Book, String>, QueryByExampleExecutor<Book>{}

 TypeRuntimeWiring wiring = … ;
 BookRepository repository = … ;

 DataFetcher<?> forMany =
         wiring.dataFetcher("books", QueryByExampleDataFetcher.builder(repository).many());

 DataFetcher<?> forSingle =
         wiring.dataFetcher("book", QueryByExampleDataFetcher.builder(repository).single());
 

See methods on QueryByExampleDataFetcher.Builder and QueryByExampleDataFetcher.ReactiveBuilder for further options on result projections and sorting.

QueryByExampleDataFetcher exposes a RuntimeWiringConfigurer that can auto-register repositories annotated with @GraphQlRepository.

Since:

1.0.0

Author:

Greg Turnquist, Rossen Stoyanchev

See Also:

• GraphQlRepository
• QueryByExampleExecutor
• ReactiveQueryByExampleExecutor
• Example
• Spring Data Query By Example extension

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	QueryByExampleDataFetcher.Builder<T,R>	Builder for a Query by Example-based DataFetcher.
static interface	QueryByExampleDataFetcher.QueryByExampleBuilderCustomizer<T>	Callback interface that can be used to customize QueryByExampleDataFetcher QueryByExampleDataFetcher.Builder to change its configuration.
static class	QueryByExampleDataFetcher.ReactiveBuilder<T,R>	Builder for a reactive Query by Example-based DataFetcher.
static interface	QueryByExampleDataFetcher.ReactiveQueryByExampleBuilderCustomizer<T>	Callback interface that can be used to customize QueryByExampleDataFetcher QueryByExampleDataFetcher.ReactiveBuilder to change its configuration.

Method Summary

Modifier and Type	Method	Description
static RuntimeWiringConfigurer	autoRegistrationConfigurer(List<org.springframework.data.repository.query.QueryByExampleExecutor<?>> executors, List<org.springframework.data.repository.query.ReactiveQueryByExampleExecutor<?>> reactiveExecutors)	Variation of autoRegistrationConfigurer(List, List, CursorStrategy, ScrollSubrange) without a CursorStrategy and default ScrollSubrange.
static RuntimeWiringConfigurer	autoRegistrationConfigurer(List<org.springframework.data.repository.query.QueryByExampleExecutor<?>> executors, List<org.springframework.data.repository.query.ReactiveQueryByExampleExecutor<?>> reactiveExecutors, CursorStrategy<org.springframework.data.domain.ScrollPosition> cursorStrategy, ScrollSubrange defaultScrollSubrange)	Return a RuntimeWiringConfigurer that installs a WiringFactory to find queries with a return type whose name matches to the domain type name of the given repositories and registers DataFetchers for them.
static <T> QueryByExampleDataFetcher.Builder<T,T>	builder(org.springframework.data.repository.query.QueryByExampleExecutor<T> executor)	Create a new QueryByExampleDataFetcher.Builder accepting QueryByExampleExecutor to build a DataFetcher.
static <T> QueryByExampleDataFetcher.ReactiveBuilder<T,T>	builder(org.springframework.data.repository.query.ReactiveQueryByExampleExecutor<T> executor)	Create a new QueryByExampleDataFetcher.ReactiveBuilder accepting ReactiveQueryByExampleExecutor to build a DataFetcher.
protected org.springframework.data.domain.Example<T>	buildExample(DataFetchingEnvironment environment)	Prepare an Example from GraphQL request arguments.
protected Collection<String>	buildPropertyPaths(DataFetchingFieldSelectionSet selection, Class<?> resultType)
String	getDescription()	Provides shared implementation of SelfDescribingDataFetcher.getDescription() for all subclasses.
protected boolean	requiresProjection(Class<?> resultType)
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Details

getDescription

public String getDescription()

Provides shared implementation of SelfDescribingDataFetcher.getDescription() for all subclasses.

Since:

1.2.0

buildExample

protected org.springframework.data.domain.Example<T> buildExample(DataFetchingEnvironment environment)
                                                           throws BindException

Prepare an Example from GraphQL request arguments.

Parameters:

environment - contextual info for the GraphQL request

Returns:

the resulting example

Throws:

BindException

requiresProjection

protected boolean requiresProjection(Class<?> resultType)

buildPropertyPaths

protected Collection<String> buildPropertyPaths(DataFetchingFieldSelectionSet selection,
 Class<?> resultType)

toString

public String toString()

Overrides:

toString in class Object

builder

public static <T>
QueryByExampleDataFetcher.Builder<T,T> builder(org.springframework.data.repository.query.QueryByExampleExecutor<T> executor)

Create a new QueryByExampleDataFetcher.Builder accepting QueryByExampleExecutor to build a DataFetcher.

Type Parameters:

T - the domain type of the repository

Parameters:

executor - the QBE repository object to use

Returns:

a new builder

builder

public static <T>
QueryByExampleDataFetcher.ReactiveBuilder<T,T> builder(org.springframework.data.repository.query.ReactiveQueryByExampleExecutor<T> executor)

Create a new QueryByExampleDataFetcher.ReactiveBuilder accepting ReactiveQueryByExampleExecutor to build a DataFetcher.

Type Parameters:

T - the domain type of the repository

Parameters:

executor - the QBE repository object to use

Returns:

a new builder

autoRegistrationConfigurer

public static RuntimeWiringConfigurer autoRegistrationConfigurer(List<org.springframework.data.repository.query.QueryByExampleExecutor<?>> executors,
 List<org.springframework.data.repository.query.ReactiveQueryByExampleExecutor<?>> reactiveExecutors)

Variation of autoRegistrationConfigurer(List, List, CursorStrategy, ScrollSubrange) without a CursorStrategy and default ScrollSubrange. For default values, see the respective methods on QueryByExampleDataFetcher.Builder and QueryByExampleDataFetcher.ReactiveBuilder.

Parameters:

executors - repositories to consider for registration

reactiveExecutors - reactive repositories to consider for registration

autoRegistrationConfigurer

public static RuntimeWiringConfigurer autoRegistrationConfigurer(List<org.springframework.data.repository.query.QueryByExampleExecutor<?>> executors,
 List<org.springframework.data.repository.query.ReactiveQueryByExampleExecutor<?>> reactiveExecutors,
 @Nullable
 CursorStrategy<org.springframework.data.domain.ScrollPosition> cursorStrategy,
 @Nullable
 ScrollSubrange defaultScrollSubrange)

Return a RuntimeWiringConfigurer that installs a WiringFactory to find queries with a return type whose name matches to the domain type name of the given repositories and registers DataFetchers for them.

Note: This applies only to top-level queries and repositories annotated with @GraphQlRepository.

Parameters:

executors - repositories to consider for registration

reactiveExecutors - reactive repositories to consider for registration

cursorStrategy - for decoding cursors in pagination requests; if null, then QueryByExampleDataFetcher.Builder.cursorStrategy defaults apply.

defaultScrollSubrange - default parameters for scrolling; if null, then QueryByExampleDataFetcher.Builder.defaultScrollSubrange(int, java.util.function.Function<java.lang.Boolean, org.springframework.data.domain.ScrollPosition>) defaults apply.

Returns:

the created configurer

Since:

1.2.0