private void ProcessSelectExpandItem(SelectExpandClause clause, EdmNode edmNode, CustomNavigationProperty parentCustomNavProp, NavigationPropertySegment parentSegment)
{
if (edmNode == null)
{
var entityType = parentSegment.EdmType.AsElementType() as EdmEntityType;
var RdfNode = new VariablePattern($"{parentSegment.NavigationProperty.Name}");
edmNode = new EdmNode()
{
Name = parentSegment.NavigationProperty.Name,
ItemEdmType = entityType,
RdfNode = RdfNode,
//StructProperties = entityType.StructuralProperties().ToList(),
NavProperties = new List <CustomNavigationProperty>()
};
parentCustomNavProp.NestedEdmNodes.Add(edmNode);
}
List <IEdmStructuralProperty> structPropList = new List <IEdmStructuralProperty>();
foreach (var item in clause.SelectedItems)
{
var selectItem = item as PathSelectItem;
if (selectItem != null && selectItem.SelectedPath != null)
{
var segment = selectItem.SelectedPath.FirstSegment as PropertySegment;
if (segment != null)
{
structPropList.Add(segment.Property);
}
}
var expandItem = item as ExpandedNavigationSelectItem;
if (expandItem != null)
{
var segment = expandItem.PathToNavigationProperty.FirstSegment as NavigationPropertySegment;
if (segment != null && expandItem.SelectAndExpand != null)
{
CustomNavigationProperty customNavProp = new CustomNavigationProperty();
edmNode.NavProperties.Add(customNavProp);
customNavProp.NestedEdmNodes = new List <EdmNode>();
customNavProp.NavigationProperty = segment.NavigationProperty;
customNavProp.Filters = expandItem.FilterOption != null ? expandItem.FilterOption.Expression : null;
customNavProp.Top = expandItem.TopOption.GetValueOrDefault();
customNavProp.Skip = expandItem.SkipOption.GetValueOrDefault();
customNavProp.OrderBy = expandItem.OrderByOption;
ProcessSelectExpandItem(expandItem.SelectAndExpand, null, customNavProp, segment);
}
}
}
if (structPropList.Count > 0)
{
//edmNode.StructProperties = structPropList;
if (parentCustomNavProp != null)
{
parentCustomNavProp.StructProperties = structPropList;
}
}
}
private string ConstructSparql()
{
NodeFactory nodeFactory = new NodeFactory();
List <ITriplePattern> constructList = new List <ITriplePattern>();
List <ITriplePattern> whereList = new List <ITriplePattern>();
List <ITriplePattern> optionList = new List <ITriplePattern>();
List <ITriplePattern> optSubQueryTriplePatterns = new List <ITriplePattern>();
EdmNode previousEdmNode = null;
EdmNode endEdmNode = EdmNodeList.Last();
foreach (var edmNode in EdmNodeList)
{
var isaTriple = new TriplePattern(edmNode.RdfNode,
new NodeMatchPattern(nodeFactory.CreateUriNode(new Uri(RdfSpecsHelper.RdfType))),
new NodeMatchPattern(nodeFactory.CreateUriNode(GetUri(edmNode.ItemEdmType))));
if (edmNode == endEdmNode)
{
constructList.Add(isaTriple);
}
whereList.Add(isaTriple);
if (previousEdmNode != null)
{
Dictionary <string, Tuple <Type, Uri> > preProperties = GetAllProperties(previousEdmNode.ItemEdmType);
var relationTriple = new TriplePattern(previousEdmNode.RdfNode,
new NodeMatchPattern(nodeFactory.CreateUriNode(new Uri(preProperties[edmNode.Name].Item2.AbsoluteUri))),
edmNode.RdfNode);
if (edmNode == endEdmNode)
{
constructList.Add(relationTriple);
}
whereList.Add(relationTriple);
}
previousEdmNode = edmNode;
if (edmNode == endEdmNode)
{
Dictionary <string, Tuple <Type, Uri> > properties = GetAllProperties(edmNode.ItemEdmType);
foreach (var prop in edmNode.StructProperties.Where(p => p.Name != "LocalId"))
{
var propTriple = new TriplePattern(edmNode.RdfNode,
new NodeMatchPattern(nodeFactory.CreateUriNode(new Uri(properties[prop.Name].Item2.AbsoluteUri))),
new VariablePattern($"{prop.Name}"));
constructList.Add(propTriple);
optionList.Add(propTriple);
}
ConstructFromNavProperties(edmNode, constructList, optSubQueryTriplePatterns);
}
}
IQueryBuilder queryBuilder = QueryBuilder.Construct(q => q.Where(constructList.ToArray()))
.Where(whereList.Concat(SubQueryTriplePatterns).ToArray());
foreach (var tp in optionList)
{
queryBuilder.Optional(gp => gp.Where(tp));
}
foreach (var tp in optSubQueryTriplePatterns)
{
queryBuilder.Optional(gp => gp.Where(tp));
}
if (FilterExp != null)
{
queryBuilder.Filter(FilterExp);
}
///*OrderBy options*/
//if (QueryOptions.OrderBy != null && QueryOptions.OrderBy.OrderByClause != null)
//{
// var edmNode = EdmNodeList[EdmNodeList.Count - 1];
// foreach (var node in QueryOptions.OrderBy.OrderByNodes)
// {
// var typedNode = node as OrderByPropertyNode;
// var ordName = typedNode.Property.Name;
// if (ordName.ToLower() == "localid")
// ordName = edmNode.Name;
// if (typedNode.OrderByClause.Direction == OrderByDirection.Ascending)
// queryBuilder.OrderBy(ordName);
// else
// queryBuilder.OrderByDescending(ordName);
// }
//}
return(queryBuilder.BuildQuery().ToString());
}
private void ConstructFromNavProperties(EdmNode edmNode, List <ITriplePattern> constructList, List <ITriplePattern> optSubQueryTriplePatterns)
{
NodeFactory nodeFactory = new NodeFactory();
Dictionary <string, Tuple <Type, Uri> > properties = GetAllProperties(edmNode.ItemEdmType);
if (edmNode.NavProperties.Count > 0)
{
foreach (var expProp in edmNode.NavProperties)
{
var expEntityType = expProp.NavigationProperty.Type.Definition.AsElementType() as EdmEntityType;
List <ITriplePattern> tripleList = new List <ITriplePattern>();
tripleList.Add(new TriplePattern(new VariablePattern($"?{expProp.NavigationProperty.Name}"),
new NodeMatchPattern(nodeFactory.CreateUriNode(new Uri(RdfSpecsHelper.RdfType))),
new NodeMatchPattern(nodeFactory.CreateUriNode(GetUri(expEntityType)))));
tripleList.Add(new TriplePattern(edmNode.RdfNode,
new NodeMatchPattern(nodeFactory.CreateUriNode(new Uri(properties[expProp.NavigationProperty.Name].Item2.AbsoluteUri))),
new VariablePattern($"?{expProp.NavigationProperty.Name}")));
constructList.AddRange(tripleList);
List <ITriplePattern> predTripleList = new List <ITriplePattern>();
Dictionary <string, Tuple <Type, Uri> > expandProperties = GetAllProperties(expEntityType);
List <IEdmStructuralProperty> structProps = expProp.StructProperties;
if (structProps == null)
{
structProps = expEntityType.StructuralProperties().ToList();
}
foreach (var prop in structProps.Where(p => p.Name != "LocalId"))
{
var expPropTriple = new TriplePattern(new VariablePattern($"?{expProp.NavigationProperty.Name}"),
new NodeMatchPattern(nodeFactory.CreateUriNode(new Uri(expandProperties[prop.Name].Item2.AbsoluteUri))),
new VariablePattern($"?{prop.Name}Expand"));
predTripleList.Add(expPropTriple);
constructList.Add(expPropTriple);
}
IQueryBuilder subqueryBuilder = null;
var variableList = structProps.Where(p => p.Name != "LocalId")
.Select(p => $"?{p.Name}Expand").ToList();
variableList.Add(expProp.NavigationProperty.Name);
if (edmNode.RdfNode is VariablePattern)
{
variableList.Add(edmNode.Name);
}
subqueryBuilder = QueryBuilder.Select(variableList.ToArray()).Where(tripleList.ToArray());
foreach (var tp in predTripleList)
{
subqueryBuilder.Optional(gp => gp.Where(tp));
}
if (expProp.Filters != null)
{
ISparqlExpression FilterExp = BuildSparqlFilter(expProp.Filters, "Expand");
subqueryBuilder.Filter(FilterExp);
}
if (expProp.Top != null & expProp.Top != 0)
{
subqueryBuilder.Limit(Convert.ToInt32(expProp.Top));
}
if (expProp.Skip != null & expProp.Skip != 0)
{
subqueryBuilder.Offset(Convert.ToInt32(expProp.Skip));
}
if (expProp.OrderBy != null)
{
foreach (var node in expProp.OrderBy.AsEnumerable())
{
//var typedNode = node as OrderByPropertyNode;
var ordName = (node.Expression as SingleValuePropertyAccessNode).Property.Name;
if (ordName.ToLower() == "localid")
{
ordName = expProp.NavigationProperty.Name;
}
else
{
ordName = $"?{ordName}Expand";
}
if (node.Direction == OrderByDirection.Ascending)
{
subqueryBuilder.OrderBy(ordName);
}
else
{
subqueryBuilder.OrderByDescending(ordName);
}
}
}
optSubQueryTriplePatterns.Add(new SubQueryPattern(subqueryBuilder.BuildQuery()));
if (expProp.NestedEdmNodes != null && expProp.NestedEdmNodes.Count > 0)
{
foreach (var nestedEdmNode in expProp.NestedEdmNodes)
{
ConstructFromNavProperties(nestedEdmNode, constructList, optSubQueryTriplePatterns);
}
}
}
}
}