[Java] Extract getPresence method.

Author: mjpt777

sbe-tool/src/main/java/uk/co/real_logic/sbe/xml/Message.java

@@ -263,28 +263,13 @@ private Field parseField(final NodeList nodeList, final int nodeIndex)
             handleError(node, "could not find type: " + typeName);
         }
 
-        final String presenceStr = getAttributeValueOrNull(node, "presence");
-        final Presence presence;
-        if (null != presenceStr)
-        {
-            presence = Presence.get(presenceStr);
-        }
-        else if (null != fieldType)
-        {
-            presence = fieldType.presence();
-        }
-        else
-        {
-            presence = Presence.REQUIRED;
-        }
-
         final Field field = new Field.Builder()
             .name(getAttributeValue(node, "name"))
             .description(getAttributeValueOrNull(node, "description"))
             .id(Integer.parseInt(getAttributeValue(node, "id")))
             .offset(Integer.parseInt(getAttributeValue(node, "offset", "0")))
             .semanticType(getAttributeValueOrNull(node, "semanticType"))
-            .presence(presence)
+            .presence(getPresence(node, fieldType))
             .valueRef(getAttributeValueOrNull(node, "valueRef"))
             .sinceVersion(Integer.parseInt(getAttributeValue(node, "sinceVersion", "0")))
             .deprecated(Integer.parseInt(getAttributeValue(node, "deprecated", "0")))
@@ -298,6 +283,27 @@ else if (null != fieldType)
         return field;
     }
 
+    private static Presence getPresence(final Node node, final Type fieldType)
+    {
+        final String presenceStr = getAttributeValueOrNull(node, "presence");
+        final Presence presence;
+
+        if (null != presenceStr)
+        {
+            presence = Presence.get(presenceStr);
+        }
+        else if (null != fieldType)
+        {
+            presence = fieldType.presence();
+        }
+        else
+        {
+            presence = Presence.REQUIRED;
+        }
+
+        return presence;
+    }
+
     private Field parseDataField(final NodeList nodeList, final int nodeIndex)
     {
         final Node node = nodeList.item(nodeIndex);