/// <summary>
/// Constructs a Node based on the given Set.
/// </summary>
/// <param name="context">Construct Context.</param>
/// <returns>The Node which is bound to this Variable in this Solution.</returns>
protected internal override INode Construct(ConstructContext context)
{
INode value = context.Set[_varname];
if (value == null)
{
throw new RdfQueryException("Unable to construct a Value for this Variable for this solution as it is bound to a null");
}
switch (value.NodeType)
{
case NodeType.Blank:
if (!context.PreserveBlankNodes && value.GraphUri != null)
{
// Rename Blank Node based on the Graph Uri Hash Code
int hash = value.GraphUri.GetEnhancedHashCode();
if (hash >= 0)
{
return(new BlankNode(context.Graph, ((IBlankNode)value).InternalID + "-" + value.GraphUri.GetEnhancedHashCode()));
}
else
{
return(new BlankNode(context.Graph, ((IBlankNode)value).InternalID + hash));
}
}
else
{
return(new BlankNode(context.Graph, ((IBlankNode)value).InternalID));
}
default:
return(context.GetNode(value));
}
}
/// <summary>
/// Constructs a Node based on the given Set
/// </summary>
/// <param name="context">Construct Context</param>
protected internal override INode Construct(ConstructContext context)
{
return(context.GetNode(this._node));
}