public IEnumerable <XElement> GetReferencedXElements(IQueryable <SOURCE> sourceTypeIqueryable, List <string> destinationPropertyNames, XName elementName, string propertyNamePrefix)
{
IQueryable <DEST> data = GetReferencedQueryable(sourceTypeIqueryable);
Expression <Func <DEST, XElement> > xelementSelector = XElementSelectHelper <DEST> .BuildXElementSelector(destinationPropertyNames, elementName, propertyNamePrefix);
return(data.Select(xelementSelector));
}
public static IEnumerable <XElement> GetXElements(
Expression <Func <T, bool> > filter,
LambdaExpression orderBy,
bool orderAscending,
int coreElementItemsPerPage,
int coreElementPageNumber,
IEnumerable <string> propertyNames,
XNamespace elementNamespace,
string elementNameString,
bool showReferencesInline,
bool showPagingInfo,
bool randomized)
{
List <string> propertyNameList = new List <string>(propertyNames);
List <string> autoAppendedPropertyNames = new List <string>();
List <string> referencedIdAttrubuteNames = new List <string>();
XName coreElementName = elementNamespace + elementNameString;
Dictionary <string, List <string> > referencesLookup = new Dictionary <string, List <string> >();
foreach (string referencePropertyName in propertyNameList.Where(f => f.Contains(".")))
{
string[] referenceElements = referencePropertyName.Split('.');
if (referenceElements.Length != 2)
{
throw new InvalidOperationException(string.Format("Property names with a dot must have exactly one dot - failed to parse '{0}'", referencePropertyName));
}
if (referencesLookup.ContainsKey(referenceElements[0]) == false)
{
referencesLookup.Add(referenceElements[0], new List <string>());
}
referencesLookup[referenceElements[0]].Add(referenceElements[1]);
}
// rewrite with linq
if (showReferencesInline)
{
// Ensure keys are included
foreach (string referencePropertyName in referencesLookup.Keys)
{
if (propertyNameList.Contains(referencePropertyName) == false)
{
propertyNameList.Add(referencePropertyName);
autoAppendedPropertyNames.Add(referencePropertyName);
}
}
}
var result = new List <XElement>();
Expression <Func <T, XElement> > xelementSelector = XElementSelectHelper <T> .BuildXElementSelector(propertyNameList.Where(f => f.IndexOf('.') == -1).ToList(), coreElementName);
// TODO: handle case of the default sorting (by predicate element => true)
IOrderByTypeFixer <T> orderByTypeFixer = GetOrderByTypeFixer(orderBy);
IQueryable <T> coreDataItems = orderByTypeFixer.GetCastedIQueryable(filter, orderBy, orderAscending, coreElementItemsPerPage, coreElementPageNumber, randomized);
if (randomized && referencesLookup.Any())
{
// performance hit! make elegant when time permits.
coreDataItems = coreDataItems.ToList().AsQueryable();
}
// Perf. optimization
if (coreDataItems.IsEnumerableQuery())
{
Func <T, XElement> compiledExpression = XElementSelectHelper <T> .GetCompiledFunction(xelementSelector);
result.AddRange(Enumerable.Select(coreDataItems, compiledExpression));
}
else
{
result.AddRange(coreDataItems.Select(xelementSelector));
}
var referencedResults = new List <XElement>();
// int referencedCoreElementCount = (orderByIsDeterministic ? coreElementItemsPerPage : int.MaxValue);
foreach (string referencePropertyName in referencesLookup.Keys)
{
IReferencedDataHelper <T> fixer = ReferencedDataHelperBuilder <T> .Build(referencePropertyName);
string propertyNamePrefix = (showReferencesInline ? referencePropertyName + "." : "");
if (showReferencesInline)
{
if (referencesLookup[referencePropertyName].Contains(fixer.TargetTypeKeyPropertyName) == false)
{
referencesLookup[referencePropertyName].Add(fixer.TargetTypeKeyPropertyName);
autoAppendedPropertyNames.Add(propertyNamePrefix + fixer.TargetTypeKeyPropertyName);
}
referencedIdAttrubuteNames.Add(propertyNamePrefix + fixer.TargetTypeKeyPropertyName);
}
XName referenceElementName = elementNamespace + referencePropertyName;
IEnumerable <XElement> referencesXml = fixer.GetReferencedXElements(coreDataItems, referencesLookup[referencePropertyName], referenceElementName, propertyNamePrefix);
referencedResults.AddRange(referencesXml);
}
if (showReferencesInline)
{
Dictionary <string, IEnumerable <XElement> > referencedElementsLookup = new Dictionary <string, IEnumerable <XElement> >();
Dictionary <string, Func <string, XAttribute> > referencedElementLocatorLookup = new Dictionary <string, Func <string, XAttribute> >();
foreach (string referencePropertyName in referencesLookup.Keys)
{
XName referenceElementName = elementNamespace + referencePropertyName;
IEnumerable <XElement> referenceElements = referencedResults.Where(f => f.Name == referenceElementName);
referencedElementsLookup.Add(referencePropertyName, referenceElements);
string idPropertyName = referencedIdAttrubuteNames.First(g => g.StartsWith(referencePropertyName + "."));
IEnumerable <XElement> referencedElements = referencedElementsLookup[referencePropertyName];
Func <string, XAttribute> locateByKeyFunc = f => referencedElements.Attributes(idPropertyName).FirstOrDefault(g => g.Value == f);
referencedElementLocatorLookup.Add(referencePropertyName, locateByKeyFunc);
}
foreach (XElement coreElement in result.Where(f => f.Name == coreElementName))
{
foreach (string referencePropertyName in referencesLookup.Keys)
{
XAttribute referenceAttribute = coreElement.Attribute(referencePropertyName);
if (referenceAttribute == null)
{
continue; // Handles non-references
}
string keyValue = referenceAttribute.Value;
Func <string, XAttribute> fetcher = referencedElementLocatorLookup[referencePropertyName];
XAttribute matchingKeyAttribute = fetcher(keyValue);
if (matchingKeyAttribute != null)
{
XElement referenced = matchingKeyAttribute.Parent;
coreElement.Add(referenced.Attributes());
}
}
coreElement.Attributes().Where(f => autoAppendedPropertyNames.Contains(f.Name.LocalName)).Remove();
yield return(coreElement);
}
}
else
{
foreach (XElement anyElement in result)
{
yield return(anyElement);
}
foreach (XElement anyElement in referencedResults)
{
yield return(anyElement);
}
}
if (showPagingInfo)
{
int totalItemCount = DataFacade.GetData <T>(filter).Count(); // TODO: there shoudn't be a query
int firstShownElementNumber = ((coreElementPageNumber - 1) * coreElementItemsPerPage) + 1;
int lastShownElementNumber = Math.Min(totalItemCount, firstShownElementNumber + (coreElementItemsPerPage - 1));
int shownItemsCount = Math.Max(0, (lastShownElementNumber - firstShownElementNumber) + 1);
int totelPageCount = (int)Math.Ceiling((((double)totalItemCount) / ((double)coreElementItemsPerPage)));
XElement pagingInfo = new XElement(elementNamespace + "PagingInfo",
new XAttribute("CurrentPageNumber", coreElementPageNumber),
new XAttribute("TotalPageCount", totelPageCount),
new XAttribute("TotalItemCount", totalItemCount),
new XAttribute("ShownItemsCount", shownItemsCount),
new XAttribute("MaximumItemsPerPage", coreElementItemsPerPage)
);
if (shownItemsCount > 0)
{
pagingInfo.Add(
new XAttribute("CurrentItemNumberStart", firstShownElementNumber),
new XAttribute("CurrentItemNumberEnd", lastShownElementNumber)
);
}
yield return(pagingInfo);
}
}