static public FieldReadWriter Create(XmlNode node, FdoCache cache, int hvoRootObj)
{
string transduceField = XmlUtils.GetOptionalAttributeValue(node, "transduce");
if (string.IsNullOrEmpty(transduceField))
return null;
string[] parts = transduceField.Split('.');
if (parts.Length != 2 && parts.Length != 3)
return null;
string className = parts[0];
string fieldName = parts[1];
IFwMetaDataCache mdc = cache.DomainDataByFlid.MetaDataCache;
int clid = mdc.GetClassId(className);
if (clid == 0)
return null;
int flid = mdc.GetFieldId2(clid, fieldName, true);
int ws = WritingSystemServices.GetWritingSystem(cache, node, null, hvoRootObj, flid, 0).Handle;
if (parts.Length == 2)
{
FieldReadWriter frw;
// parts are divided into class.propname
if (DoItMethod.IsMultilingual(flid, mdc))
frw = new OwnMlPropReadWriter(cache, flid, ws);
else
frw = new OwnStringPropReadWriter(cache, flid, GetWsFromMetaData(ws, flid, cache));
frw.InitForGhostItems(cache, node);
return frw;
}
// parts.Length is 3. We have class.objectpropname.propname
int clidDst = mdc.GetDstClsId(flid);
int fieldType = mdc.GetFieldType(flid);
int flid2 = mdc.GetFieldId2(clidDst, parts[2], true);
int clidCreate = clidDst; // default
string createClassName = XmlUtils.GetOptionalAttributeValue(node, "transduceCreateClass");
if (createClassName != null)
clidCreate = mdc.GetClassId(createClassName);
if (DoItMethod.IsMultilingual(flid2, mdc))
{
Debug.Assert(ws != 0);
// If it's a multilingual field and we didn't get a writing system, we can't transduce this field.
if (ws == 0)
return null;
if (fieldType == (int)CellarPropertyType.OwningAtomic)
return new OwnAtomicMlPropReadWriter(cache, flid2, ws, flid, clidCreate);
else if (fieldType == (int)CellarPropertyType.OwningSequence)
return new OwnSeqMlPropReadWriter(cache, flid2, ws, flid, clidCreate);
else
return null; // can't handle yet
}
else
{
if (fieldType == (int)CellarPropertyType.OwningAtomic)
return new OwnAtomicStringPropReadWriter(cache, flid2, ws, flid, clidCreate);
else if (fieldType == (int)CellarPropertyType.OwningSequence)
return new OwnSeqStringPropReadWriter(cache, flid2, ws, flid, clidCreate);
else
return null; // can't handle yet
}
}
