private SparqlUpdateCommand TryParseDeleteDataCommand(SparqlUpdateParserContext context)
{
DeleteDataCommand cmd;
SparqlQueryParserContext subContext = new SparqlQueryParserContext(context.Tokens);
subContext.Query.BaseUri = context.BaseUri;
subContext.Query.NamespaceMap = context.NamespaceMap;
subContext.ExpressionParser.NamespaceMap = context.NamespaceMap;
subContext.ExpressionParser.ExpressionFactories = context.ExpressionFactories;
subContext.ExpressionFactories = context.ExpressionFactories;
subContext.ExpressionParser.QueryParser = context.QueryParser;
subContext.CheckBlankNodeScope = false;
GraphPattern gp = context.QueryParser.TryParseGraphPattern(subContext, context.Tokens.LastTokenType != Token.LEFTCURLYBRACKET);
// Validate that the Graph Pattern is simple
// Check it doesn't contain anything other than Triple Patterns or if it does it just contains a single GRAPH Pattern
if (gp.IsFiltered)
{
throw new RdfParseException("A FILTER Clause cannot occur in a DELETE DATA Command");
}
else if (gp.IsOptional)
{
throw new RdfParseException("An OPTIONAL Clause cannot occur in a DELETE DATA Command");
}
else if (gp.IsUnion)
{
throw new RdfParseException("A UNION Clause cannot occur in a DELETE DATA Command");
}
else if (gp.HasChildGraphPatterns)
{
if (!gp.ChildGraphPatterns.All(p => (p.IsGraph && p.GraphSpecifier.TokenType != Token.VARIABLE) || (!p.IsExists && !p.IsMinus && !p.IsNotExists && !p.IsOptional && !p.IsOptional && !p.IsService && !p.IsSubQuery && !p.IsUnion && !p.IsGraph)))
{
throw new RdfParseException("A DELETE DATA Command may only contain a combination of Triple Patterns and GRAPH clauses, GRAPH clauses must specify a Graph URI");
}
else if (gp.ChildGraphPatterns.Any(p => p.HasChildGraphPatterns))
{
throw new RdfParseException("A DELETE DATA Command may not contain nested Graph Patterns");
}
else if (gp.ChildGraphPatterns.Count == 1 && gp.ChildGraphPatterns[0].IsGraph && gp.TriplePatterns.Count == 0)
{
cmd = new DeleteDataCommand(gp.ChildGraphPatterns[0]);
}
else if (gp.HasChildGraphPatterns)
{
cmd = new DeleteDataCommand(gp);
}
else
{
throw new RdfParseException("Nested Graph Patterns cannot occur in a DELETE DATA Command");
}
}
else
{
// OK
cmd = new DeleteDataCommand(gp);
}
return(cmd);
}
/// <summary>
/// Processes a DELETE DATA command
/// </summary>
/// <param name="cmd">DELETE Data Command</param>
public void ProcessDeleteDataCommand(DeleteDataCommand cmd)
{
this.ProcessCommand(cmd);
}
/// <summary>
/// Processes a DELETE DATA command.
/// </summary>
/// <param name="cmd">Delete Data Command.</param>
/// <param name="context">SPARQL Update Evaluation Context.</param>
protected virtual void ProcessDeleteDataCommandInternal(DeleteDataCommand cmd, SparqlUpdateEvaluationContext context)
{
cmd.Evaluate(context);
}
/// <summary>
/// Processes a DELETE DATA command.
/// </summary>
/// <param name="cmd">DELETE Data Command.</param>
public void ProcessDeleteDataCommand(DeleteDataCommand cmd)
{
ProcessDeleteDataCommandInternal(cmd, GetContext());
}
