create constant for query keyword

Author: CNAChino

src/main/java/com/intuit/graphql/orchestrator/resolverdirective/FieldResolverDirectiveUtil.java

@@ -28,6 +28,9 @@ public class FieldResolverDirectiveUtil {
   public static final String RESOLVER_DIRECTIVE_NAME = "resolver";
   public static final String FIELD_REFERENCE_PREFIX = "$";
 
+  public static final String FQN_KEYWORD_QUERY = "query";
+  public static final char FQN_FIELD_SEPARATOR = '.';
+
   public static final CharSequence OPERATION_NAME_SEPARATOR = "_";
   public static final CharSequence RESOLVER_DIRECTIVE_QUERY_NAME = "Resolver_Directive_Query";
 

src/main/java/com/intuit/graphql/orchestrator/schema/transform/FieldResolverTransformerPostMerge.java

@@ -1,5 +1,7 @@
 package com.intuit.graphql.orchestrator.schema.transform;
 
+import static com.intuit.graphql.orchestrator.resolverdirective.FieldResolverDirectiveUtil.FQN_FIELD_SEPARATOR;
+import static com.intuit.graphql.orchestrator.resolverdirective.FieldResolverDirectiveUtil.FQN_KEYWORD_QUERY;
 import static com.intuit.graphql.orchestrator.utils.XtextGraphUtils.addToCodeRegistry;
 import static com.intuit.graphql.orchestrator.utils.XtextTypeUtils.createNamedType;
 import static com.intuit.graphql.orchestrator.utils.XtextTypeUtils.getFieldDefinitions;
@@ -198,9 +200,9 @@ private void replacePlaceholderTypeWithActual(FieldResolverContext fieldResolver
 
   private FieldDefinition getFieldDefinitionByFQN(final String queryFieldFQN, XtextGraph xtextGraph) {
 
-    String queryFieldFQNNoQuery = StringUtils.removeStart(queryFieldFQN ,"query."); // remove if exists
+    String queryFieldFQNNoQuery = StringUtils.removeStart(queryFieldFQN ,FQN_KEYWORD_QUERY + FQN_FIELD_SEPARATOR); // remove if exists
 
-    String[] queryFieldFQNTokens = StringUtils.split(queryFieldFQNNoQuery, '.');
+    String[] queryFieldFQNTokens = StringUtils.split(queryFieldFQNNoQuery, FQN_FIELD_SEPARATOR);
     if (ArrayUtils.isEmpty(queryFieldFQNTokens)) {
       String errorMessage = String.format("Failed to tokenize queryFieldFQN.  queryFieldFQN=%s", queryFieldFQN);
       throw new IllegalArgumentException(errorMessage);