Added a named SDL definition (#2538)

* Added a named SDL definition

* Added SDLExtensionDefinition for definitions that are extends

src/main/java/graphql/language/DirectiveDefinition.java

@@ -21,7 +21,7 @@
 import static java.util.Collections.emptyMap;
 
 @PublicApi
-public class DirectiveDefinition extends AbstractDescribedNode<DirectiveDefinition> implements SDLDefinition<DirectiveDefinition>, NamedNode<DirectiveDefinition> {
+public class DirectiveDefinition extends AbstractDescribedNode<DirectiveDefinition> implements SDLNamedDefinition<DirectiveDefinition>, NamedNode<DirectiveDefinition> {
     private final String name;
     private final boolean repeatable;
     private final ImmutableList<InputValueDefinition> inputValueDefinitions;

src/main/java/graphql/language/EnumTypeExtensionDefinition.java

@@ -14,7 +14,7 @@
 import static graphql.collect.ImmutableKit.emptyList;
 
 @PublicApi
-public class EnumTypeExtensionDefinition extends EnumTypeDefinition {
+public class EnumTypeExtensionDefinition extends EnumTypeDefinition implements SDLExtensionDefinition {
 
     @Internal
     protected EnumTypeExtensionDefinition(String name,

src/main/java/graphql/language/InputObjectTypeExtensionDefinition.java

@@ -14,7 +14,7 @@
 import static graphql.collect.ImmutableKit.emptyList;
 
 @PublicApi
-public class InputObjectTypeExtensionDefinition extends InputObjectTypeDefinition {
+public class InputObjectTypeExtensionDefinition extends InputObjectTypeDefinition implements SDLExtensionDefinition {
 
     @Internal
     protected InputObjectTypeExtensionDefinition(String name,

src/main/java/graphql/language/InterfaceTypeDefinition.java

@@ -21,7 +21,7 @@
 import static graphql.language.NodeChildrenContainer.newNodeChildrenContainer;
 
 @PublicApi
-public class InterfaceTypeDefinition extends AbstractDescribedNode<InterfaceTypeDefinition> implements ImplementingTypeDefinition<InterfaceTypeDefinition>, DirectivesContainer<InterfaceTypeDefinition>, NamedNode<InterfaceTypeDefinition> {
+public class InterfaceTypeDefinition extends AbstractDescribedNode<InterfaceTypeDefinition> implements ImplementingTypeDefinition<InterfaceTypeDefinition>, DirectivesContainer<InterfaceTypeDefinition>, NamedNode<InterfaceTypeDefinition>, SDLExtensionDefinition {
 
     private final String name;
     private final ImmutableList<Type> implementz;

src/main/java/graphql/language/ObjectTypeExtensionDefinition.java

@@ -17,7 +17,7 @@
 import static graphql.collect.ImmutableKit.emptyMap;
 
 @PublicApi
-public class ObjectTypeExtensionDefinition extends ObjectTypeDefinition {
+public class ObjectTypeExtensionDefinition extends ObjectTypeDefinition implements SDLExtensionDefinition {
 
     @Internal
     protected ObjectTypeExtensionDefinition(String name,

src/main/java/graphql/language/SDLDefinition.java

@@ -4,7 +4,7 @@
 import graphql.PublicApi;
 
 /**
- * All Schema Definition Language (SDL) Definitions.
+ * An interface for Schema Definition Language (SDL) definitions.
  *
  * @param <T> the actual Node type
  */

src/main/java/graphql/language/SDLExtensionDefinition.java

@@ -0,0 +1,12 @@
+package graphql.language;
+
+
+import graphql.PublicApi;
+
+/**
+ * An marker interface for Schema Definition Language (SDL) extension definitions.
+ */
+@PublicApi
+public interface SDLExtensionDefinition {
+
+}

src/main/java/graphql/language/SDLNamedDefinition.java

@@ -0,0 +1,18 @@
+package graphql.language;
+
+
+import graphql.PublicApi;
+
+/**
+ * A interface for named Schema Definition Language (SDL) definition.
+ *
+ * @param <T> the actual Node type
+ */
+@PublicApi
+public interface SDLNamedDefinition<T extends SDLNamedDefinition> extends SDLDefinition<T> {
+
+    /**
+     * @return The name of this SDL definition
+     */
+    String getName();
+}

src/main/java/graphql/language/ScalarTypeExtensionDefinition.java

@@ -14,7 +14,7 @@
 import static graphql.collect.ImmutableKit.emptyList;
 
 @PublicApi
-public class ScalarTypeExtensionDefinition extends ScalarTypeDefinition {
+public class ScalarTypeExtensionDefinition extends ScalarTypeDefinition implements SDLExtensionDefinition {
 
     @Internal
     protected ScalarTypeExtensionDefinition(String name,

src/main/java/graphql/language/SchemaExtensionDefinition.java

@@ -4,7 +4,6 @@
 import graphql.PublicApi;
 import graphql.collect.ImmutableKit;
 
-import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -14,7 +13,7 @@
 import static graphql.collect.ImmutableKit.emptyList;
 
 @PublicApi
-public class SchemaExtensionDefinition extends SchemaDefinition {
+public class SchemaExtensionDefinition extends SchemaDefinition implements SDLExtensionDefinition {
 
     protected SchemaExtensionDefinition(List<Directive> directives,
                                         List<OperationTypeDefinition> operationTypeDefinitions,

src/main/java/graphql/language/TypeDefinition.java

@@ -4,11 +4,11 @@
 import graphql.PublicApi;
 
 /**
- * All type definitions in a SDL.
+ * An interface for type definitions in a Schema Definition Language (SDL).
  *
  * @param <T> the actual Node type
  */
 @PublicApi
-public interface TypeDefinition<T extends TypeDefinition> extends SDLDefinition<T>, DirectivesContainer<T>, NamedNode<T> {
+public interface TypeDefinition<T extends TypeDefinition> extends SDLNamedDefinition<T>, DirectivesContainer<T>, NamedNode<T> {
 
 }

src/main/java/graphql/language/UnionTypeExtensionDefinition.java

@@ -14,7 +14,7 @@
 import static graphql.collect.ImmutableKit.emptyList;
 
 @PublicApi
-public class UnionTypeExtensionDefinition extends UnionTypeDefinition {
+public class UnionTypeExtensionDefinition extends UnionTypeDefinition implements SDLExtensionDefinition {
 
     @Internal
     protected UnionTypeExtensionDefinition(String name,