Examples with TypeResolver graphql.schema.TypeResolver used on opensource projects

Example 1 with TypeResolver

use of graphql.schema.TypeResolver in project graphql-java by graphql-java.

the class SchemaGenerator method getTypeResolverForUnion.

@SuppressWarnings("Duplicates")
private TypeResolver getTypeResolverForUnion(BuildContext buildCtx, UnionTypeDefinition unionType) {
    TypeDefinitionRegistry typeRegistry = buildCtx.getTypeRegistry();
    RuntimeWiring wiring = buildCtx.getWiring();
    WiringFactory wiringFactory = wiring.getWiringFactory();
    TypeResolver typeResolver;
    UnionWiringEnvironment environment = new UnionWiringEnvironment(typeRegistry, unionType);
    if (wiringFactory.providesTypeResolver(environment)) {
        typeResolver = wiringFactory.getTypeResolver(environment);
        assertNotNull(typeResolver, "The WiringFactory indicated it union provides a type resolver but then returned null");
    } else {
        typeResolver = wiring.getTypeResolvers().get(unionType.getName());
        if (typeResolver == null) {
            // this really should be checked earlier via a pre-flight check
            typeResolver = new TypeResolverProxy();
        }
    }
    return typeResolver;
}

Example 2 with TypeResolver

use of graphql.schema.TypeResolver in project graphql-java by graphql-java.

the class SchemaGenerator method getTypeResolverForInterface.

@SuppressWarnings("Duplicates")
private TypeResolver getTypeResolverForInterface(BuildContext buildCtx, InterfaceTypeDefinition interfaceType) {
    TypeDefinitionRegistry typeRegistry = buildCtx.getTypeRegistry();
    RuntimeWiring wiring = buildCtx.getWiring();
    WiringFactory wiringFactory = wiring.getWiringFactory();
    TypeResolver typeResolver;
    InterfaceWiringEnvironment environment = new InterfaceWiringEnvironment(typeRegistry, interfaceType);
    if (wiringFactory.providesTypeResolver(environment)) {
        typeResolver = wiringFactory.getTypeResolver(environment);
        assertNotNull(typeResolver, "The WiringFactory indicated it provides a interface type resolver but then returned null");
    } else {
        typeResolver = wiring.getTypeResolvers().get(interfaceType.getName());
        if (typeResolver == null) {
            // this really should be checked earlier via a pre-flight check
            typeResolver = new TypeResolverProxy();
        }
    }
    return typeResolver;
}

Example 3 with TypeResolver

use of graphql.schema.TypeResolver in project graphql-java by graphql-java.

the class HttpMain method buildStarWarsSchema.

private GraphQLSchema buildStarWarsSchema() {
    // 
    if (starWarsSchema == null) {
        // 
        // 
        // the fetcher of friends uses java-dataloader to make the circular friends fetching
        // more efficient by batching and caching the calls to load Character friends
        // 
        DataFetcher friendsFetcher = environment -> {
            DataLoaderRegistry dataloaderRegistry = asMapGet(environment.getContext(), "dataloaderRegistry");
            DataLoader friendsDataLoader = dataloaderRegistry.getDataLoader("friends");
            List<String> friendIds = asMapGet(environment.getSource(), "friends");
            return friendsDataLoader.loadMany(friendIds);
        };
        // 
        // reads a file that provides the schema types
        // 
        Reader streamReader = loadSchemaFile("starWarsSchemaAnnotated.graphqls");
        TypeDefinitionRegistry typeRegistry = new SchemaParser().parse(streamReader);
        // 
        // the runtime wiring is used to provide the code that backs the
        // logical schema
        // 
        TypeResolver characterTypeResolver = env -> {
            Map<String, Object> obj = (Map<String, Object>) env.getObject();
            String id = (String) obj.get("id");
            GraphQLSchema schema = env.getSchema();
            if (StarWarsData.isHuman(id)) {
                return (GraphQLObjectType) schema.getType("Human");
            } else {
                return (GraphQLObjectType) schema.getType("Droid");
            }
        };
        RuntimeWiring wiring = RuntimeWiring.newRuntimeWiring().type(newTypeWiring("Query").dataFetcher("hero", StarWarsData.getHeroDataFetcher()).dataFetcher("human", StarWarsData.getHumanDataFetcher()).dataFetcher("droid", StarWarsData.getDroidDataFetcher())).type(newTypeWiring("Human").dataFetcher("friends", friendsFetcher)).type(newTypeWiring("Droid").dataFetcher("friends", friendsFetcher)).type(newTypeWiring("Character").typeResolver(characterTypeResolver)).type(newTypeWiring("Episode").enumValues(StarWarsData.getEpisodeResolver())).build();
        // finally combine the logical schema with the physical runtime
        starWarsSchema = new SchemaGenerator().makeExecutableSchema(typeRegistry, wiring);
    }
    return starWarsSchema;
}