org.springframework.graphql.data.querydsl

Class QuerydslDataFetcher<T>

java.lang.Object

org.springframework.graphql.data.querydsl.QuerydslDataFetcher<T>

Type Parameters:

T - returned result type

public abstract class QuerydslDataFetcher<T>
extends Object

Entry point to create DataFetcher using repositories through Querydsl. Exposes builders accepting QuerydslPredicateExecutor or ReactiveQuerydslPredicateExecutor that support customization of bindings and interface- and DTO projections. Instances can be created through a builder to query for QuerydslDataFetcher.Builder.single() or QuerydslDataFetcher.Builder.many() objects.

Example:

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

 TypeRuntimeWiring wiring = … ;
 BookRepository repository = … ;

 wiring.dataFetcher("books", QuerydslDataFetcher.builder(repository).many())
       .dataFetcher("book", QuerydslDataFetcher.builder(repository).single());
 

DataFetcher returning reactive types such as Mono and Flux can be constructed from a ReactiveQuerydslPredicateExecutor using builder.

For example:

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

 TypeRuntimeWiring wiring = …;
 BookRepository repository = …;

 wiring.dataFetcher("books", QuerydslDataFetcher.builder(repository).many())
       .dataFetcher("book", QuerydslDataFetcher.builder(repository).single());
 

Since:

1.0.0

Author:

Mark Paluch

See Also:

QuerydslPredicateExecutor, ReactiveQuerydslPredicateExecutor, Predicate, QuerydslBinderCustomizer, Spring Data Querydsl extension

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	QuerydslDataFetcher.Builder<T,R> Builder for a Querydsl-based DataFetcher.
static class	QuerydslDataFetcher.ReactiveBuilder<T,R> Builder for a reactive Querydsl-based DataFetcher.

Method Summary

Modifier and Type	Method and Description
static <T> QuerydslDataFetcher.Builder<T,T>	builder(org.springframework.data.querydsl.QuerydslPredicateExecutor<T> executor) Create a new QuerydslDataFetcher.Builder accepting QuerydslPredicateExecutor to build a DataFetcher.
static <T> QuerydslDataFetcher.ReactiveBuilder<T,T>	builder(org.springframework.data.querydsl.ReactiveQuerydslPredicateExecutor<T> executor) Create a new QuerydslDataFetcher.ReactiveBuilder accepting ReactiveQuerydslPredicateExecutor to build a reactive DataFetcher.
protected com.querydsl.core.types.Predicate	buildPredicate(DataFetchingEnvironment environment)
static GraphQLTypeVisitor	registrationTypeVisitor(List<org.springframework.data.querydsl.QuerydslPredicateExecutor<?>> executors, List<org.springframework.data.querydsl.ReactiveQuerydslPredicateExecutor<?>> reactiveExecutors) Create a GraphQLTypeVisitor that finds queries with a return type whose name matches to the domain type name of the given repositories and registers DataFetchers for those queries.

Methods inherited from class java.lang.Object

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

Method Detail

builder

public static <T> QuerydslDataFetcher.Builder<T,T> builder(org.springframework.data.querydsl.QuerydslPredicateExecutor<T> executor)

Create a new QuerydslDataFetcher.Builder accepting QuerydslPredicateExecutor to build a DataFetcher.

Type Parameters:

T - result type

Parameters:

executor - the repository object to use

Returns:

a new builder

builder

public static <T> QuerydslDataFetcher.ReactiveBuilder<T,T> builder(org.springframework.data.querydsl.ReactiveQuerydslPredicateExecutor<T> executor)

Create a new QuerydslDataFetcher.ReactiveBuilder accepting ReactiveQuerydslPredicateExecutor to build a reactive DataFetcher.

Type Parameters:

T - result type

Parameters:

executor - the repository object to use

Returns:

a new builder

registrationTypeVisitor

public static GraphQLTypeVisitor registrationTypeVisitor(List<org.springframework.data.querydsl.QuerydslPredicateExecutor<?>> executors,
                                                         List<org.springframework.data.querydsl.ReactiveQuerydslPredicateExecutor<?>> reactiveExecutors)

Create a GraphQLTypeVisitor that finds queries with a return type whose name matches to the domain type name of the given repositories and registers DataFetchers for those queries.

Note: currently, this method will match only to queries under the top-level "Query" type in the GraphQL schema.

Parameters:

executors - repositories to consider for registration

reactiveExecutors - reactive repositories to consider for registration

Returns:

the created visitor

buildPredicate

protected com.querydsl.core.types.Predicate buildPredicate(DataFetchingEnvironment environment)