/// <summary>
/// Formats a Pattern Item in nicely formatted SPARQL syntax
/// </summary>
/// <param name="item">Pattern Item</param>
/// <param name="segment">Triple Pattern Segment</param>
/// <returns></returns>
public virtual String Format(PatternItem item, TripleSegment?segment)
{
if (item is VariablePattern)
{
return(item.ToString());
}
else if (item is NodeMatchPattern)
{
NodeMatchPattern match = (NodeMatchPattern)item;
return(this.Format(match.Node, segment));
}
else if (item is FixedBlankNodePattern)
{
if (segment != null)
{
if (segment == TripleSegment.Predicate)
{
throw new RdfOutputException("Cannot format a Fixed Blank Node Pattern Item as the Predicate of a Triple Pattern as Blank Nodes are not permitted as Predicates");
}
}
return(item.ToString());
}
else if (item is BlankNodePattern)
{
return(item.ToString());
}
else
{
throw new RdfOutputException("Unable to Format an unknown PatternItem implementation as a String");
}
}
private string getName(PatternItem item)
{
if (item is VariablePattern || (item as NodeMatchPattern).Node.NodeType.ToString().Equals("Literal"))
{
return(item.ToString());
}
else
{
var node = (item as NodeMatchPattern).ToString().Replace("<", "").Replace(">", "");
Uri uri = new Uri(node);
var last = uri.Segments.Last <string>();
return(last);
}
}
/// <summary>
/// Gets the String representation of the Algebra.
/// </summary>
/// <returns></returns>
public override string ToString()
{
StringBuilder output = new StringBuilder();
output.Append("NegatedPropertySet(");
output.Append(_start.ToString());
output.Append(", {");
for (int i = 0; i < _properties.Count; i++)
{
output.Append(_properties[i].ToString());
if (i < _properties.Count - 1)
{
output.Append(", ");
}
}
output.Append("}, ");
output.Append(_end.ToString());
output.Append(')');
return(output.ToString());
}