/// <summary>
/// The TranslateElements method iterates over a list of objects
/// from an entity in the XML representation of a dictionary and
/// translates them into a collection of VFX dictionary types.
/// </summary>
/// <param name="elements">
/// The list of objects from an entity in the XML representation
/// of a VersaFix dictionary.
/// </param>
/// <returns>
/// An instance of FixDxCollection that has been populated with
/// the VersaFix dictionary types that correspond to the objects
/// in the list of XML elements.
/// </returns>
private static FixDxCollection TranslateElements(List <object> elements)
{
FixDxCollection result = new FixDxCollection();
foreach (object element in elements)
{
if (element is XmlFixDxFieldReference)
{
XmlFixDxFieldReference src = element as XmlFixDxFieldReference;
result.Add(new FixDxFieldReference(src.Name, src.Required));
}
else if (element is XmlFixDxGroupReference)
{
XmlFixDxGroupReference src = element as XmlFixDxGroupReference;
FixDxGroupReference dst = new FixDxGroupReference(src.Name, src.Required);
foreach (IFixDxElement member in TranslateElements(src.Elements))
{
dst.Elements.Add(member);
}
result.Add(dst);
}
else if (element is XmlFixDxBlockReference)
{
XmlFixDxBlockReference src = element as XmlFixDxBlockReference;
result.Add(new FixDxBlockReference(src.Name, src.Required));
}
}
return(result);
}
/// <summary>
/// The Expand method iterates over all of the elements in
/// a collection of dictionary elements and expands any of
/// them that reference collections of other elements.
/// </summary>
/// <param name="source">
/// The collection of elements to expand.
/// </param>
/// <returns>
/// A new instance of a collection of dictionary elements
/// with all expandable references in the source collection
/// having been recursively expanded.
/// </returns>
public FixDxCollection Expand(FixDxCollection source)
{
FixDxCollection result = new FixDxCollection();
foreach (IFixDxElement dxEntry in source)
{
if (dxEntry is FixDxBlockReference)
{
FixDxBlockReference blockReference = dxEntry as FixDxBlockReference;
if (blockReference != null)
{
if (_mapBlocksByName.ContainsKey(blockReference.Name))
{
FixDxBlock blockEntry = _mapBlocksByName[blockReference.Name];
FixDxCollection blockElements = Expand(blockEntry.Elements);
foreach (IFixDxElement blockElement in blockElements)
{
if (blockElement is FixDxFieldReference)
{
FixDxFieldReference reference = blockElement as FixDxFieldReference;
result.Add(reference);
}
else if (blockElement is FixDxBlockReference)
{
FixDxBlockReference reference = blockElement as FixDxBlockReference;
result.Add(reference);
}
}
}
}
}
else
{
if (dxEntry is FixDxGroupReference)
{
FixDxGroupReference srcReference = dxEntry as FixDxGroupReference;
FixDxGroupReference dstReference = new FixDxGroupReference(srcReference.Name, srcReference.Required);
foreach (IFixDxElement srcElement in Expand(srcReference.Elements))
{
dstReference.Elements.Add(srcElement);
}
result.Add(dstReference);
}
else if (dxEntry is FixDxFieldReference)
{
FixDxFieldReference element = dxEntry as FixDxFieldReference;
result.Add(element);
}
}
}
return(result);
}
/// <summary>
/// The TranslateElements method converts a collection of
/// dictionary elements into their corresponding representation
/// as instances of XML serializable classes. The method only
/// translates field, group, and block references, since those
/// are the only elements that should be found in collections
/// of dictionary elements under normal usage.
/// </summary>
/// <param name="dxElements">
/// The collection of field, group, and block references that
/// is to be converted to XML serializable classes.
/// </param>
/// <returns>
/// The resulting collection of XML serializable classes.
/// </returns>
private static XmlFixDxElements TranslateElements(FixDxCollection dxElements)
{
XmlFixDxElements result = new XmlFixDxElements();
foreach (IFixDxElement dxElement in dxElements)
{
if (dxElement is FixDxFieldReference)
{
FixDxFieldReference dxReference = dxElement as FixDxFieldReference;
XmlFixDxFieldReference xmlReference = new XmlFixDxFieldReference();
xmlReference.Name = dxReference.Name;
xmlReference.Required = dxReference.Required;
result.Elements.Add(xmlReference);
}
else if (dxElement is FixDxGroupReference)
{
FixDxGroupReference dxReference = dxElement as FixDxGroupReference;
XmlFixDxGroupReference xmlReference = new XmlFixDxGroupReference();
xmlReference.Name = dxReference.Name;
xmlReference.Required = dxReference.Required;
XmlFixDxElements xmlElements = TranslateElements(dxReference.Elements);
foreach (object xmlElement in xmlElements.Elements)
{
xmlReference.Elements.Add(xmlElement);
}
result.Elements.Add(xmlReference);
}
else if (dxElement is FixDxBlockReference)
{
FixDxBlockReference dxReference = dxElement as FixDxBlockReference;
XmlFixDxBlockReference xmlReference = new XmlFixDxBlockReference();
xmlReference.Name = dxReference.Name;
xmlReference.Required = dxReference.Required;
result.Elements.Add(xmlReference);
}
}
return(result);
}
/// <summary>
/// The Resolve method attempts to resolve all of the
/// element references in a collection to the entries
/// that correspond to them.
/// </summary>
/// <param name="elements">
/// The collection of dictionary elements to resolve.
/// </param>
/// <returns>
/// The resulting collection of resolved elements.
/// </returns>
/// <exception cref="ArgumentException">
/// Thrown if any elements in the collection that is
/// supplied to the method cannot be resolved.
/// </exception>
public FixDxCollection Resolve(FixDxCollection elements)
{
FixDxCollection result = new FixDxCollection();
// REC: Iterate over all of the elements in the collection
// and determine how to resolve each of them:
foreach (IFixDxElement dxElement in elements)
{
if (dxElement is FixDxFieldReference)
{
FixDxFieldReference fieldReference = dxElement as FixDxFieldReference;
result.Add(ResolveFieldReference(fieldReference));
}
else if (dxElement is FixDxGroupReference)
{
FixDxGroupReference groupReference = dxElement as FixDxGroupReference;
result.Add(ResolveGroupReference(groupReference));
}
else if (dxElement is FixDxBlockReference)
{
FixDxBlockReference blockReference = dxElement as FixDxBlockReference;
// REC: Determine what type of block the reference
// is referring to (component or repeating):
if (string.IsNullOrEmpty(blockReference.Name))
{
string error = "The supplied block reference's name is null or empty.";
throw new ArgumentException(error);
}
else if (!_mapBlocksByName.ContainsKey(blockReference.Name))
{
string error = string.Format("The block reference {0} couldn't be resolved.", blockReference.Name);
throw new ArgumentException(error);
}
else
{
FixDxBlock dxBlock = _mapBlocksByName[blockReference.Name];
if (dxBlock.Type == FixDxBlockTypes.Component)
{
foreach (IFixDxElement element in Resolve(Expand(dxBlock.Elements)))
{
result.Add(element);
}
}
else if (dxBlock.Type == FixDxBlockTypes.Repeating)
{
// REC: Attempt to resolve the field that the repeating
// block references as the start field for the group:
if (string.IsNullOrEmpty(dxBlock.Field))
{
string error = string.Format("Repeating Block {0}'s start field is null or empty.", dxBlock.Field);
throw new ArgumentException(error);
}
else if (!_mapFieldsByName.ContainsKey(dxBlock.Field))
{
string error = string.Format("Repeating block {0}'s start field can't be resolved.", dxBlock.Field);
throw new ArgumentException(error);
}
else
{
FixDxField dxField = _mapFieldsByName[dxBlock.Field];
FixDxResolvedGroup dxGroup = new FixDxResolvedGroup(dxField.Tag, dxField.Name, false);
foreach (IFixDxElement element in Resolve(Expand(dxBlock.Elements)))
{
dxGroup.Elements.Add(element);
}
result.Add(dxGroup);
}
}
}
}
}
// REC: Patch from RC - sanity check all elements in the result
// to ensure that there are no unresolved references.
foreach (IFixDxElement e in result)
{
if (e is FixDxFieldReference || e is FixDxGroupReference || e is FixDxFieldReference)
{
throw new Exception("unresolved references exist in the resolved collection");
}
}
return(result);
}