/// <summary>
/// Internal method which generates the HTML Output for the Sparql Results.
/// </summary>
/// <param name="results"></param>
/// <param name="output"></param>
private void GenerateOutput(SparqlResultSet results, TextWriter output)
{
HtmlTextWriter writer = new HtmlTextWriter(output);
QNameOutputMapper qnameMapper = new QNameOutputMapper(_namespaces != null ? _namespaces : new NamespaceMapper(true));
// Page Header
writer.Write("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");
writer.RenderBeginTag(HtmlTextWriterTag.Html);
writer.RenderBeginTag(HtmlTextWriterTag.Head);
writer.RenderBeginTag(HtmlTextWriterTag.Title);
writer.WriteEncodedText("SPARQL Query Results");
writer.RenderEndTag();
if (!Stylesheet.Equals(String.Empty))
{
writer.AddAttribute(HtmlTextWriterAttribute.Href, Stylesheet);
writer.AddAttribute(HtmlTextWriterAttribute.Type, "text/css");
writer.AddAttribute(HtmlTextWriterAttribute.Rel, "stylesheet");
writer.RenderBeginTag(HtmlTextWriterTag.Link);
writer.RenderEndTag();
}
// TODO: Add <meta> for charset?
writer.RenderEndTag();
// Start Body
writer.RenderBeginTag(HtmlTextWriterTag.Body);
if (results.ResultsType == SparqlResultsType.VariableBindings)
{
// Create a Table for the results
writer.AddAttribute(HtmlTextWriterAttribute.Width, "100%");
writer.RenderBeginTag(HtmlTextWriterTag.Table);
// Create a Table Header with the Variable Names
writer.RenderBeginTag(HtmlTextWriterTag.Thead);
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
foreach (String var in results.Variables)
{
writer.RenderBeginTag(HtmlTextWriterTag.Th);
writer.WriteEncodedText(var);
writer.RenderEndTag();
}
writer.RenderEndTag();
writer.RenderEndTag();
writer.WriteLine();
// Create a Table Body for the Results
writer.RenderBeginTag(HtmlTextWriterTag.Tbody);
// Create a Column for each Binding
foreach (SparqlResult result in results)
{
// Start Row
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
foreach (String var in results.Variables)
{
// Start Column
writer.RenderBeginTag(HtmlTextWriterTag.Td);
if (result.HasValue(var))
{
INode value = result[var];
if (value != null)
{
switch (value.NodeType)
{
case NodeType.Blank:
writer.AddAttribute(HtmlTextWriterAttribute.Class, CssClassBlankNode);
writer.RenderBeginTag(HtmlTextWriterTag.Span);
writer.WriteEncodedText(value.ToString());
writer.RenderEndTag();
break;
case NodeType.Literal:
ILiteralNode lit = (ILiteralNode)value;
writer.AddAttribute(HtmlTextWriterAttribute.Class, CssClassLiteral);
writer.RenderBeginTag(HtmlTextWriterTag.Span);
if (lit.DataType != null)
{
writer.WriteEncodedText(lit.Value);
writer.RenderEndTag();
writer.WriteEncodedText("^^");
writer.AddAttribute(HtmlTextWriterAttribute.Href, _formatter.FormatUri(lit.DataType.AbsoluteUri));
writer.AddAttribute(HtmlTextWriterAttribute.Class, CssClassDatatype);
writer.RenderBeginTag(HtmlTextWriterTag.A);
writer.WriteEncodedText(lit.DataType.ToString());
writer.RenderEndTag();
}
else
{
writer.WriteEncodedText(lit.Value);
if (!lit.Language.Equals(String.Empty))
{
writer.RenderEndTag();
writer.WriteEncodedText("@");
writer.AddAttribute(HtmlTextWriterAttribute.Class, CssClassLangSpec);
writer.RenderBeginTag(HtmlTextWriterTag.Span);
writer.WriteEncodedText(lit.Language);
writer.RenderEndTag();
}
else
{
writer.RenderEndTag();
}
}
break;
case NodeType.GraphLiteral:
// Error
throw new RdfOutputException("Result Sets which contain Graph Literal Nodes cannot be serialized in the HTML Format");
case NodeType.Uri:
writer.AddAttribute(HtmlTextWriterAttribute.Class, CssClassUri);
writer.AddAttribute(HtmlTextWriterAttribute.Href, _formatter.FormatUri(UriPrefix + value.ToString()));
writer.RenderBeginTag(HtmlTextWriterTag.A);
String qname;
if (qnameMapper.ReduceToQName(value.ToString(), out qname))
{
writer.WriteEncodedText(qname);
}
else
{
writer.WriteEncodedText(value.ToString());
}
writer.RenderEndTag();
break;
default:
throw new RdfOutputException("Result Sets which contain Unknown Node Types cannot be serialized in the HTML Format");
}
}
else
{
writer.WriteEncodedText(" ");
}
}
else
{
writer.WriteEncodedText(" ");
}
// End Column
writer.RenderEndTag();
}
// End Row
writer.RenderEndTag();
writer.WriteLine();
}
// End Table Body
writer.RenderEndTag();
// End Table
writer.RenderEndTag();
}
else
{
// Show a Header and a Boolean value
writer.RenderBeginTag(HtmlTextWriterTag.H3);
writer.WriteEncodedText("ASK Query Result");
writer.RenderEndTag();
writer.RenderBeginTag(HtmlTextWriterTag.P);
writer.WriteEncodedText(results.Result.ToString());
writer.RenderEndTag();
}
// End of Page
writer.RenderEndTag(); //End Body
writer.RenderEndTag(); //End Html
}
