spring-graphql QueryByExampleDataFetcher 源码
spring-graphql QueryByExampleDataFetcher 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/data/query/QueryByExampleDataFetcher.java
/*
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.graphql.data.query;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import graphql.schema.DataFetcher;
import graphql.schema.DataFetchingEnvironment;
import graphql.schema.DataFetchingFieldSelectionSet;
import graphql.schema.GraphQLTypeVisitor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.core.ResolvableType;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Sort;
import org.springframework.data.repository.query.FluentQuery;
import org.springframework.data.repository.query.QueryByExampleExecutor;
import org.springframework.data.repository.query.ReactiveQueryByExampleExecutor;
import org.springframework.data.util.TypeInformation;
import org.springframework.graphql.data.GraphQlArgumentBinder;
import org.springframework.graphql.data.GraphQlRepository;
import org.springframework.graphql.execution.RuntimeWiringConfigurer;
import org.springframework.util.Assert;
import org.springframework.validation.BindException;
/**
* Main class to create a {@link DataFetcher} from a Query By Example repository.
* To create an instance, use one of the following:
* <ul>
* <li>{@link #builder(QueryByExampleExecutor)}
* <li>{@link #builder(ReactiveQueryByExampleExecutor)}
* </ul>
*
* <p>For example:
*
* <pre class="code">
* 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());
* </pre>
*
* <p>See methods on {@link QueryByExampleDataFetcher.Builder} and
* {@link QueryByExampleDataFetcher.ReactiveBuilder} for further options on
* result projections and sorting.
*
* <p>{@code QueryByExampleDataFetcher} {@link #autoRegistrationConfigurer(List, List) exposes}
* a {@link RuntimeWiringConfigurer} that can auto-register repositories
* annotated with {@link GraphQlRepository @GraphQlRepository}.
*
* @param <T> returned result type
* @author Greg Turnquist
* @author Rossen Stoyanchev
* @since 1.0.0
*
* @see GraphQlRepository
* @see QueryByExampleExecutor
* @see ReactiveQueryByExampleExecutor
* @see Example
* @see <a href="https://docs.spring.io/spring-data/commons/docs/current/reference/html/#query-by-example">
* Spring Data Query By Example extension</a>
*/
public abstract class QueryByExampleDataFetcher<T> {
private final static Log logger = LogFactory.getLog(QueryByExampleDataFetcher.class);
private final TypeInformation<T> domainType;
private final GraphQlArgumentBinder argumentBinder;
QueryByExampleDataFetcher(TypeInformation<T> domainType) {
this.domainType = domainType;
this.argumentBinder = new GraphQlArgumentBinder();
}
/**
* Prepare an {@link Example} from GraphQL request arguments.
* @param env contextual info for the GraphQL request
* @return the resulting example
*/
@SuppressWarnings({"ConstantConditions", "unchecked"})
protected Example<T> buildExample(DataFetchingEnvironment env) throws BindException {
ResolvableType targetType = ResolvableType.forClass(this.domainType.getType());
return (Example<T>) Example.of(this.argumentBinder.bind(env, null, targetType));
}
protected boolean requiresProjection(Class<?> resultType) {
return !resultType.equals(this.domainType.getType());
}
protected Collection<String> buildPropertyPaths(DataFetchingFieldSelectionSet selection, Class<?> resultType) {
// Compute selection only for non-projections
if (this.domainType.getType().equals(resultType) ||
this.domainType.getType().isAssignableFrom(resultType) ||
this.domainType.isSubTypeOf(resultType)) {
return PropertySelection.create(this.domainType, selection).toList();
}
return Collections.emptyList();
}
/**
* Create a new {@link Builder} accepting {@link QueryByExampleExecutor}
* to build a {@link DataFetcher}.
*
* @param executor the QBE repository object to use
* @param <T> the domain type of the repository
* @return a new builder
*/
public static <T> Builder<T, T> builder(QueryByExampleExecutor<T> executor) {
return new Builder<>(executor, RepositoryUtils.getDomainType(executor));
}
/**
* Create a new {@link ReactiveBuilder} accepting
* {@link ReactiveQueryByExampleExecutor} to build a {@link DataFetcher}.
*
* @param executor the QBE repository object to use
* @param <T> the domain type of the repository
* @return a new builder
*/
public static <T> ReactiveBuilder<T, T> builder(ReactiveQueryByExampleExecutor<T> executor) {
return new ReactiveBuilder<>(executor, RepositoryUtils.getDomainType(executor));
}
/**
* Return a {@link RuntimeWiringConfigurer} that installs a
* {@link graphql.schema.idl.WiringFactory} to find queries with a return
* type whose name matches to the domain type name of the given repositories
* and registers {@link DataFetcher}s for them.
*
* <p><strong>Note:</strong> This applies only to top-level queries and
* repositories annotated with {@link GraphQlRepository @GraphQlRepository}.
*
* @param executors repositories to consider for registration
* @param reactiveExecutors reactive repositories to consider for registration
* @return the created configurer
*/
public static RuntimeWiringConfigurer autoRegistrationConfigurer(
List<QueryByExampleExecutor<?>> executors,
List<ReactiveQueryByExampleExecutor<?>> reactiveExecutors) {
Map<String, Function<Boolean, DataFetcher<?>>> factories = new HashMap<>();
for (QueryByExampleExecutor<?> executor : executors) {
String typeName = RepositoryUtils.getGraphQlTypeName(executor);
if (typeName != null) {
factories.put(typeName, single -> single ? builder(executor).single() : builder(executor).many());
}
}
for (ReactiveQueryByExampleExecutor<?> executor : reactiveExecutors) {
String typeName = RepositoryUtils.getGraphQlTypeName(executor);
if (typeName != null) {
factories.put(typeName, single -> single ? builder(executor).single() : builder(executor).many());
}
}
if (logger.isTraceEnabled()) {
logger.trace("Auto-registration candidate typeNames " + factories.keySet());
}
return new AutoRegistrationRuntimeWiringConfigurer(factories);
}
/**
* Create a {@link GraphQLTypeVisitor} that finds queries with a return type
* whose name matches to the domain type name of the given repositories and
* registers {@link DataFetcher}s for those queries.
* <p><strong>Note:</strong> currently, this method will match only to
* queries under the top-level "Query" type in the GraphQL schema.
*
* @param executors repositories to consider for registration
* @param reactiveExecutors reactive repositories to consider for registration
* @return the created visitor
* @deprecated in favor of {@link #autoRegistrationConfigurer(List, List)}
*/
@Deprecated
public static GraphQLTypeVisitor autoRegistrationTypeVisitor(
List<QueryByExampleExecutor<?>> executors,
List<ReactiveQueryByExampleExecutor<?>> reactiveExecutors) {
Map<String, Function<Boolean, DataFetcher<?>>> factories = new HashMap<>();
for (QueryByExampleExecutor<?> executor : executors) {
String typeName = RepositoryUtils.getGraphQlTypeName(executor);
if (typeName != null) {
factories.put(typeName, single -> single ? builder(executor).single() : builder(executor).many());
}
}
for (ReactiveQueryByExampleExecutor<?> executor : reactiveExecutors) {
String typeName = RepositoryUtils.getGraphQlTypeName(executor);
if (typeName != null) {
factories.put(typeName, single -> single ? builder(executor).single() : builder(executor).many());
}
}
return new AutoRegistrationTypeVisitor(factories);
}
/**
* Builder for a Query by Example-based {@link DataFetcher}. Note that builder
* instances are immutable and return a new instance of the builder
* when calling configuration methods.
*
* @param <T> domain type
* @param <R> result type
*/
public static class Builder<T, R> {
private final QueryByExampleExecutor<T> executor;
private final TypeInformation<T> domainType;
private final Class<R> resultType;
private final Sort sort;
@SuppressWarnings("unchecked")
Builder(QueryByExampleExecutor<T> executor, Class<R> domainType) {
this(executor, TypeInformation.of((Class<T>) domainType), domainType, Sort.unsorted());
}
Builder(QueryByExampleExecutor<T> executor, TypeInformation<T> domainType, Class<R> resultType, Sort sort) {
this.executor = executor;
this.domainType = domainType;
this.resultType = resultType;
this.sort = sort;
}
/**
* Project results returned from the {@link QueryByExampleExecutor}
* into the target {@code projectionType}. Projection types can be
* either interfaces with property getters to expose or regular classes
* outside the entity type hierarchy for DTO projections.
* @param projectionType projection type
* @return a new {@link Builder} instance with all previously
* configured options and {@code projectionType} applied
*/
public <P> Builder<T, P> projectAs(Class<P> projectionType) {
Assert.notNull(projectionType, "Projection type must not be null");
return new Builder<>(this.executor, this.domainType, projectionType, this.sort);
}
/**
* Apply a {@link Sort} order.
* @param sort the default sort order
* @return a new {@link Builder} instance with all previously configured
* options and {@code Sort} applied
*/
public Builder<T, R> sortBy(Sort sort) {
Assert.notNull(sort, "Sort must not be null");
return new Builder<>(this.executor, this.domainType, this.resultType, sort);
}
/**
* Build a {@link DataFetcher} to fetch single object instances.
*/
public DataFetcher<R> single() {
return new SingleEntityFetcher<>(this.executor, this.domainType, this.resultType, this.sort);
}
/**
* Build a {@link DataFetcher} to fetch many object instances.
*/
public DataFetcher<Iterable<R>> many() {
return new ManyEntityFetcher<>(this.executor, this.domainType, this.resultType, this.sort);
}
}
/**
* Builder for a reactive Query by Example-based {@link DataFetcher}.
* Note that builder instances are immutable and return a new instance of
* the builder when calling configuration methods.
*
* @param <T> domain type
* @param <R> result type
*/
public static class ReactiveBuilder<T, R> {
private final ReactiveQueryByExampleExecutor<T> executor;
private final TypeInformation<T> domainType;
private final Class<R> resultType;
private final Sort sort;
@SuppressWarnings("unchecked")
ReactiveBuilder(ReactiveQueryByExampleExecutor<T> executor, Class<R> domainType) {
this(executor, TypeInformation.of((Class<T>) domainType), domainType, Sort.unsorted());
}
ReactiveBuilder(
ReactiveQueryByExampleExecutor<T> executor, TypeInformation<T> domainType,
Class<R> resultType, Sort sort) {
this.executor = executor;
this.domainType = domainType;
this.resultType = resultType;
this.sort = sort;
}
/**
* Project results returned from the {@link ReactiveQueryByExampleExecutor}
* into the target {@code projectionType}. Projection types can be
* either interfaces with property getters to expose or regular classes
* outside the entity type hierarchy for DTO projections.
* @param projectionType projection type
* @return a new {@link ReactiveBuilder} instance with all previously
* configured options and {@code projectionType} applied
*/
public <P> ReactiveBuilder<T, P> projectAs(Class<P> projectionType) {
Assert.notNull(projectionType, "Projection type must not be null");
return new ReactiveBuilder<>(this.executor, this.domainType, projectionType, this.sort);
}
/**
* Apply a {@link Sort} order.
* @param sort the default sort order
* @return a new {@link ReactiveBuilder} instance with all previously configured
* options and {@code Sort} applied
*/
public ReactiveBuilder<T, R> sortBy(Sort sort) {
Assert.notNull(sort, "Sort must not be null");
return new ReactiveBuilder<>(this.executor, this.domainType, this.resultType, sort);
}
/**
* Build a {@link DataFetcher} to fetch single object instances.
*/
public DataFetcher<Mono<R>> single() {
return new ReactiveSingleEntityFetcher<>(this.executor, this.domainType, this.resultType, this.sort);
}
/**
* Build a {@link DataFetcher} to fetch many object instances.
*/
public DataFetcher<Flux<R>> many() {
return new ReactiveManyEntityFetcher<>(this.executor, this.domainType, this.resultType, this.sort);
}
}
private static class SingleEntityFetcher<T, R> extends QueryByExampleDataFetcher<T> implements DataFetcher<R> {
private final QueryByExampleExecutor<T> executor;
private final Class<R> resultType;
private final Sort sort;
SingleEntityFetcher(
QueryByExampleExecutor<T> executor, TypeInformation<T> domainType, Class<R> resultType, Sort sort) {
super(domainType);
this.executor = executor;
this.resultType = resultType;
this.sort = sort;
}
@Override
@SuppressWarnings({"ConstantConditions", "unchecked"})
public R get(DataFetchingEnvironment env) throws BindException {
return this.executor.findBy(buildExample(env), query -> {
FluentQuery.FetchableFluentQuery<R> queryToUse = (FluentQuery.FetchableFluentQuery<R>) query;
if (this.sort.isSorted()) {
queryToUse = queryToUse.sortBy(this.sort);
}
Class<R> resultType = this.resultType;
if (requiresProjection(resultType)) {
queryToUse = queryToUse.as(resultType);
}
else {
queryToUse = queryToUse.project(buildPropertyPaths(env.getSelectionSet(), resultType));
}
return queryToUse.first();
}).orElse(null);
}
}
private static class ManyEntityFetcher<T, R> extends QueryByExampleDataFetcher<T> implements DataFetcher<Iterable<R>> {
private final QueryByExampleExecutor<T> executor;
private final Class<R> resultType;
private final Sort sort;
ManyEntityFetcher(
QueryByExampleExecutor<T> executor, TypeInformation<T> domainType,
Class<R> resultType, Sort sort) {
super(domainType);
this.executor = executor;
this.resultType = resultType;
this.sort = sort;
}
@Override
@SuppressWarnings("unchecked")
public Iterable<R> get(DataFetchingEnvironment env) throws BindException {
return this.executor.findBy(buildExample(env), query -> {
FluentQuery.FetchableFluentQuery<R> queryToUse = (FluentQuery.FetchableFluentQuery<R>) query;
if (this.sort.isSorted()) {
queryToUse = queryToUse.sortBy(this.sort);
}
if (requiresProjection(this.resultType)) {
queryToUse = queryToUse.as(this.resultType);
}
else {
queryToUse = queryToUse.project(buildPropertyPaths(env.getSelectionSet(), this.resultType));
}
return queryToUse.all();
});
}
}
private static class ReactiveSingleEntityFetcher<T, R> extends QueryByExampleDataFetcher<T> implements DataFetcher<Mono<R>> {
private final ReactiveQueryByExampleExecutor<T> executor;
private final Class<R> resultType;
private final Sort sort;
ReactiveSingleEntityFetcher(
ReactiveQueryByExampleExecutor<T> executor, TypeInformation<T> domainType,
Class<R> resultType, Sort sort) {
super(domainType);
this.executor = executor;
this.resultType = resultType;
this.sort = sort;
}
@Override
@SuppressWarnings("unchecked")
public Mono<R> get(DataFetchingEnvironment env) throws BindException {
return this.executor.findBy(buildExample(env), query -> {
FluentQuery.ReactiveFluentQuery<R> queryToUse = (FluentQuery.ReactiveFluentQuery<R>) query;
if (this.sort.isSorted()) {
queryToUse = queryToUse.sortBy(this.sort);
}
if (requiresProjection(this.resultType)) {
queryToUse = queryToUse.as(this.resultType);
}
else {
queryToUse = queryToUse.project(buildPropertyPaths(env.getSelectionSet(), this.resultType));
}
return queryToUse.first();
});
}
}
private static class ReactiveManyEntityFetcher<T, R> extends QueryByExampleDataFetcher<T> implements DataFetcher<Flux<R>> {
private final ReactiveQueryByExampleExecutor<T> executor;
private final Class<R> resultType;
private final Sort sort;
ReactiveManyEntityFetcher(
ReactiveQueryByExampleExecutor<T> executor, TypeInformation<T> domainType,
Class<R> resultType, Sort sort) {
super(domainType);
this.executor = executor;
this.resultType = resultType;
this.sort = sort;
}
@Override
@SuppressWarnings("unchecked")
public Flux<R> get(DataFetchingEnvironment env) throws BindException {
return this.executor.findBy(buildExample(env), query -> {
FluentQuery.ReactiveFluentQuery<R> queryToUse = (FluentQuery.ReactiveFluentQuery<R>) query;
if (this.sort.isSorted()) {
queryToUse = queryToUse.sortBy(this.sort);
}
if (requiresProjection(this.resultType)) {
queryToUse = queryToUse.as(this.resultType);
}
else {
queryToUse = queryToUse.project(buildPropertyPaths(env.getSelectionSet(), this.resultType));
}
return queryToUse.all();
});
}
}
}
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