org.springframework.graphql.data

Class QuerydslDataFetcher<T>

java.lang.Object

org.springframework.graphql.data.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

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)

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

buildPredicate

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