diff --git a/AlgebraicDataflowArchitectureModel/src/generators/CodeGenerator.java b/AlgebraicDataflowArchitectureModel/src/generators/CodeGenerator.java
index b91cf6e..825564e 100644
--- a/AlgebraicDataflowArchitectureModel/src/generators/CodeGenerator.java
+++ b/AlgebraicDataflowArchitectureModel/src/generators/CodeGenerator.java
@@ -367,4 +367,28 @@
 			}
 		};
 	}
+	
+	protected IResourceStateAccessor getRefAccessor() {
+		return new IResourceStateAccessor() {
+			@Override
+			public Expression getCurrentStateAccessorFor(ResourcePath target, ResourcePath from) {
+				if (target.equals(from)) {
+					return new Field(fieldOfResourceState,
+							target.getResourceStateType() != null ? target.getResourceStateType()
+									: DataConstraintModel.typeInt);
+				}
+				// for reference channel member
+				return new Parameter(target.getResourceName(),
+						target.getResourceStateType() != null ? target.getResourceStateType()
+								: DataConstraintModel.typeInt);
+			}
+
+			@Override
+			public Expression getNextStateAccessorFor(ResourcePath target, ResourcePath from) {
+				return new Parameter(target.getResourceName(),
+						target.getResourceStateType() != null ? target.getResourceStateType()
+								: DataConstraintModel.typeInt);
+			}
+		};
+	}
 }