stevedlawrence commented on a change in pull request #207: Added support for 
enumerations and TypeValueCalc
URL: https://github.com/apache/incubator-daffodil/pull/207#discussion_r278202422
 
 

 ##########
 File path: 
daffodil-runtime1/src/main/scala/org/apache/daffodil/dpath/DFDLXTypeCalcFunctions.scala
 ##########
 @@ -0,0 +1,239 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.daffodil.dpath
+
+import org.apache.daffodil.xml.QName
+import org.apache.daffodil.util.Maybe
+import org.apache.daffodil.processors.TypeCalculator
+import org.apache.daffodil.processors.SimpleTypeRuntimeData
+import org.apache.daffodil.exceptions.Assert
+import org.apache.daffodil.dpath.NodeInfo.PrimType.IntegerKind
+import org.apache.daffodil.dpath.NodeInfo.PrimType.String
+import org.apache.daffodil.dpath.NodeInfo.PrimType.Integer
+
+trait typeCalculatorNamedDispatch { self: FNTwoArgs =>
+  var srcType: NodeInfo.Kind = null
+  var dstType: NodeInfo.Kind = null
+
+  override def validateType(srcTypes: Seq[NodeInfo.Kind], dstType: 
NodeInfo.Kind): Unit = {
+    //We can't actually verify anything yet, because we need to wait until 
run() is
+    //called to know what calculator we are using
 
 Review comment:
   I'm not sure I understand this. What information is only available at 
runtime that is needed to validate the types? Seems like maybe you could create 
a custom Expr (instead of FNTwoArgExpr) that can do all the necessary 
validation at schema compile time?
   
   The function name is also a little confusing. This function only exists in 
two places and neither one does actual vlaidation. Maybe a different name would 
make more sense to make it clear it's just setting types related to the 
function?

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