Merge pull request #108 from tsurdilo/graphqladd

add graphql supp

Author: tsurdilo

api/src/main/java/io/serverlessworkflow/api/deserializers/FunctionRefDeserializer.java

@@ -67,6 +67,10 @@ public FunctionRef deserialize(JsonParser jp,
                 functionRef.setRefName(node.get("refName").asText());
             }
 
+            if (node.get("selectionSet") != null) {
+                functionRef.setSelectionSet(node.get("selectionSet").asText());
+            }
+
             return functionRef;
         }
     }

api/src/main/java/io/serverlessworkflow/api/serializers/FunctionRefSerializer.java

@@ -39,6 +39,7 @@ public void serialize(FunctionRef functionRef,
 
         if (functionRef != null) {
             if ((functionRef.getArguments() == null || functionRef.getArguments().isEmpty())
+                    && (functionRef.getSelectionSet() == null || functionRef.getSelectionSet().isEmpty())
                     && functionRef.getRefName() != null
                     && functionRef.getRefName().length() > 0) {
                 gen.writeString(functionRef.getRefName());
@@ -53,6 +54,10 @@ public void serialize(FunctionRef functionRef,
                     gen.writeObjectField("arguments", functionRef.getArguments());
                 }
 
+                if (functionRef.getSelectionSet() != null && functionRef.getSelectionSet().length() > 0) {
+                    gen.writeStringField("selectionSet", functionRef.getSelectionSet());
+                }
+
                 gen.writeEndObject();
             }
         }

api/src/main/resources/schema/functions/functiondef.json

@@ -18,6 +18,7 @@
       "enum": [
         "rest",
         "rpc",
+        "graphql",
         "expression"
       ],
       "default": "rest"

api/src/main/resources/schema/functions/functionref.json

@@ -11,6 +11,10 @@
       "type": "object",
       "description": "Function arguments",
       "existingJavaType": "com.fasterxml.jackson.databind.JsonNode"
+    },
+    "selectionSet": {
+      "type": "string",
+      "description": "Only used if function type is 'graphql'. A string containing a valid GraphQL selection set"
     }
   },
   "required": [