graphql-java-support: Fix grammar violation in graphql-java's SchemaPrinter

graphql-java-support/src/main/java/com/apollographql/federation/graphqljava/SchemaTransformer.java

@@ -11,7 +11,6 @@
 import graphql.schema.GraphQLSchema;
 import graphql.schema.GraphQLType;
 import graphql.schema.TypeResolver;
-import graphql.schema.idl.SchemaPrinter;
 import graphql.schema.idl.errors.SchemaProblem;
 import org.jetbrains.annotations.NotNull;
 
@@ -139,11 +138,11 @@ public final GraphQLSchema build() throws SchemaProblem {
     }
 
     private String sdl() {
-        final SchemaPrinter.Options options = SchemaPrinter.Options.defaultOptions()
+        final FederationSdlPrinter.Options options = FederationSdlPrinter.Options.defaultOptions()
                 .includeScalarTypes(true)
                 .includeExtendedScalarTypes(true)
                 .includeSchemaDefintion(true)
                 .includeDirectives(true);
-        return new SchemaPrinter(options).print(originalSchema);
+        return new FederationSdlPrinter(options).print(originalSchema);
     }
 }

graphql-java-support/src/test/java/com/apollographql/federation/graphqljava/FederationTest.java

@@ -6,6 +6,9 @@
 import graphql.schema.GraphQLType;
 import graphql.schema.GraphQLUnionType;
 import graphql.schema.idl.RuntimeWiring;
+import graphql.schema.idl.SchemaGenerator;
+import graphql.schema.idl.SchemaParser;
+import graphql.schema.idl.TypeDefinitionRegistry;
 import graphql.schema.idl.TypeRuntimeWiring;
 import graphql.schema.idl.errors.SchemaProblem;
 import org.junit.jupiter.api.Assertions;
@@ -26,6 +29,7 @@ class FederationTest {
     private final String interfacesSDL = TestUtils.readResource("schemas/interfaces.graphql");
     private final String isolatedSDL = TestUtils.readResource("schemas/isolated.graphql");
     private final String productSDL = TestUtils.readResource("schemas/product.graphql");
+    private final String printerSDL = TestUtils.readResource("schemas/printer.graphql");
 
     @Test
     void testEmpty() {
@@ -127,4 +131,22 @@ void testInterfacesAreCovered() {
 
         assertIterableEquals(Arrays.asList("Book", "Movie", "Page"), unionTypes);
     }
+
+    @Test
+    void testPrinter() {
+        TypeDefinitionRegistry typeDefinitionRegistry = new SchemaParser().parse(printerSDL);
+        RuntimeWiring runtimeWiring = RuntimeWiring.newRuntimeWiring()
+                .type("Interface1", typeWiring -> typeWiring
+                        .typeResolver(env -> null)
+                )
+                .type("Interface2", typeWiring -> typeWiring
+                        .typeResolver(env -> null)
+                )
+                .build();
+        GraphQLSchema graphQLSchema = new SchemaGenerator().makeExecutableSchema(
+                typeDefinitionRegistry,
+                runtimeWiring
+        );
+        Assertions.assertEquals(printerSDL.trim(), new FederationSdlPrinter().print(graphQLSchema).trim());
+    }
 }

graphql-java-support/src/test/java/com/apollographql/federation/graphqljava/SchemaUtils.java

@@ -2,7 +2,6 @@
 
 import graphql.ExecutionResult;
 import graphql.schema.GraphQLSchema;
-import graphql.schema.idl.SchemaPrinter;
 
 import java.util.Map;
 
@@ -17,7 +16,7 @@ private SchemaUtils() {
     }
 
     static String printSchema(GraphQLSchema schema) {
-        return new SchemaPrinter().print(schema);
+        return new FederationSdlPrinter().print(schema);
     }
 
     static ExecutionResult execute(GraphQLSchema schema, String query) {

graphql-java-support/src/test/resources/com/apollographql/federation/graphqljava/schemas/empty.graphql

@@ -2,5 +2,4 @@ schema {
   query: Query
 }
 
-type Query {
-}
+type Query

graphql-java-support/src/test/resources/com/apollographql/federation/graphqljava/schemas/isolated.graphql

@@ -1,5 +1,4 @@
-type Query {
-}
+type Query
 
 type SomeType @key(fields: "theKey") {
     theKey: ID!

graphql-java-support/src/test/resources/com/apollographql/federation/graphqljava/schemas/printer.graphql

@@ -0,0 +1,25 @@
+interface Interface1
+
+interface Interface2 {
+  dummy: String
+}
+
+type Object1
+
+type Object2 {
+  dummy: String
+}
+
+type Query
+
+enum Enum1
+
+enum Enum2 {
+  DUMMY
+}
+
+input InputObject1
+
+input InputObject2 {
+  dummy: String
+}

graphql-java-support/src/test/resources/com/apollographql/federation/graphqljava/schemas/product.graphql

@@ -14,5 +14,4 @@ type Product @key(fields : "upc") {
   upc: String!
 }
 
-type Query {
-}
+type Query