Adding missing directive definition (#11)

* Handle DirectiveDefinition in GraphQLDefinitionType determiner

* Adding a catch handler in case there are other types we can't handle

* Fixing typo from last commit

Author: a-stewart

src/main/java/com/kobylynskyi/graphql/codegen/GraphqlCodegen.java

@@ -4,6 +4,7 @@
 import com.kobylynskyi.graphql.codegen.model.GraphqlDefinitionType;
 import com.kobylynskyi.graphql.codegen.model.DefinitionTypeDeterminer;
 import com.kobylynskyi.graphql.codegen.model.MappingConfig;
+import com.kobylynskyi.graphql.codegen.model.UnsupportedGraphqlDefinitionException;
 import freemarker.template.TemplateException;
 import graphql.language.*;
 import lombok.Getter;
@@ -52,7 +53,12 @@ public void generate() throws Exception {
 
     private void processDocument(Document document) throws IOException, TemplateException {
         for (Definition definition : document.getDefinitions()) {
-            GraphqlDefinitionType definitionType = DefinitionTypeDeterminer.determine(definition);
+            GraphqlDefinitionType definitionType;
+            try {
+                definitionType = DefinitionTypeDeterminer.determine(definition);
+            } catch (UnsupportedGraphqlDefinitionException ex) {
+                continue;
+            }
             switch (definitionType) {
                 case OPERATION:
                     generateOperation((ObjectTypeDefinition) definition);

src/main/java/com/kobylynskyi/graphql/codegen/model/DefinitionTypeDeterminer.java

@@ -26,6 +26,8 @@ public static GraphqlDefinitionType determine(@NonNull Definition definition) {
             return GraphqlDefinitionType.SCALAR;
         } else if (definition instanceof InterfaceTypeDefinition) {
             return GraphqlDefinitionType.INTERFACE;
+        } else if (definition instanceof DirectiveDefinition) {
+            return GraphqlDefinitionType.DIRECTIVE;
         } else {
             throw new UnsupportedGraphqlDefinitionException(definition);
         }

src/main/java/com/kobylynskyi/graphql/codegen/model/GraphqlDefinitionType.java

@@ -9,6 +9,7 @@ public enum GraphqlDefinitionType {
     INPUT,
     UNION,
     ENUM,
-    SCALAR;
+    SCALAR,
+    DIRECTIVE;
 
 }