/// <summary>
/// Converts a <see cref="GraphDiffReport">diff</see> to an equivalent <see cref="ModifyCommand">SPARQL Update INSERT/DELETE command</see>.
/// </summary>
/// <param name="diff">The <see cref="GraphDiffReport">diff</see> to convert.</param>
/// <param name="graphUri">Optional <see cref="Uri">URI</see> of the affected graph.</param>
/// <param name="prefixes">Optional <see cref="INamespaceMapper">mapper</see> used to resolve prefixes.</param>
/// <returns>A <see cref="ModifyCommand">SPARQL Update INSERT/DELETE command</see> that represents the <see cref="GraphDiffReport">diff</see>.</returns>
public static ModifyCommand AsUpdate(this GraphDiffReport diff, Uri graphUri = null, INamespaceMapper prefixes = null)
{
var delete = new GraphPatternBuilder();
var insert = new GraphPatternBuilder();
var where = new GraphPatternBuilder();
// Removed ground triples are added as is to both delete and where clauses
foreach (var t in diff.RemovedTriples)
{
delete.AddTriplePattern(t);
where.AddTriplePattern(t);
}
foreach (var g in diff.RemovedMSGs)
{
// Blank nodes in removed non-ground triples are converted to variables and added to both delete and where clauses
foreach (var t in g.Triples)
{
delete.AddVariablePattern(t);
where.AddVariablePattern(t);
}
// An ISBLANK filter is added for each blank node in removed non-ground triples
foreach (var n in g.BlankNodes())
{
where.AddBlankNodeFilter(n);
}
}
// Added triples (ground or not) are added as is to the insert clause
foreach (var t in diff.AllAddedTriples())
{
insert.AddTriplePattern(t);
}
return(new ModifyCommand(
delete.BuildGraphPattern(prefixes),
insert.BuildGraphPattern(prefixes),
where.BuildGraphPattern(prefixes),
graphUri));
}
/// <summary>
/// Converts a <see cref="GraphDiffReport">diff</see> to an equivalent <see cref="ModifyCommand">SPARQL Update query</see>
/// </summary>
/// <param name="diff">The <see cref="GraphDiffReport">diff</see> to convert</param>
/// <returns>A <see cref="ModifyCommand">SPARQL Update query</see> that represents the <see cref="GraphDiffReport">diff</see></returns>
internal static ModifyCommand AsUpdate(this GraphDiffReport diff)
{
var delete = new GraphPatternBuilder();
var insert = new GraphPatternBuilder();
var where = new GraphPatternBuilder();
// Groud removed triples are added as is to both delete and where clauses
foreach (var t in diff.RemovedTriples)
{
delete.AddTriplePattern(t);
where.AddTriplePattern(t);
}
foreach (var g in diff.RemovedMSGs)
{
// Blank nodes in non-ground removed triples are converted to variables and added to both delete and where clauses
foreach (var t in g.Triples)
{
delete.AddVariablePattern(t);
where.AddVariablePattern(t);
}
// An ISBLANK filter is added for each blank node in non-ground removed triples
foreach (var n in g.BlankNodes())
{
where.AddBlankNodeFilter(n);
}
}
// Added triples (ground or not) are added as is to the insert clause
foreach (var t in diff.AllAddedTriples())
{
insert.AddTriplePattern(t);
}
return(new ModifyCommand(
delete.BuildGraphPattern(),
insert.BuildGraphPattern(),
where.BuildGraphPattern()));
}
