/// <summary>
/// Retrieves a resource from the model. Provides a resource object of the given type.
/// </summary>
/// <param name="uri">A Uniform Resource Identifier.</param>
/// <param name="transaction">ransaction associated with this action.</param>
/// <returns>A resource with all asserted properties.</returns>
public T GetResource <T>(Uri uri, ITransaction transaction = null) where T : Resource
{
ISparqlQuery query = new SparqlQuery("SELECT ?s ?p ?o FROM @model WHERE { ?s ?p ?o. FILTER (?s = @subject) }");
query.Bind("@model", this.Uri);
query.Bind("@subject", uri);
ISparqlQueryResult result = ExecuteQuery(query, transaction: transaction);
IEnumerable <T> resources = result.GetResources <T>();
if (resources.Any())
{
T r = resources.First();
r.IsNew = false;
r.IsSynchronized = true;
r.SetModel(this);
return(r);
}
else
{
string msg = "Error: Could not find resource <{0}>.";
throw new ArgumentException(string.Format(msg, uri));
}
}
/// <summary>
/// Indicates wheter a given resource is part of the model.
/// </summary>
/// <param name="uri">A Uniform Resource Identifier.</param>
/// <param name="transaction">Transaction associated with this action.</param>
/// <returns>True if the resource is part of the model, False if not.</returns>
public bool ContainsResource(Uri uri, ITransaction transaction = null)
{
ISparqlQuery query = new SparqlQuery("ASK FROM @graph { @subject ?p ?o . }");
query.Bind("@graph", this.Uri);
query.Bind("@subject", uri);
return(ExecuteQuery(query, transaction: transaction).GetAnwser());
}
/// <summary>
/// Retrieves a resource from the model.
/// </summary>
/// <param name="uri">A Uniform Resource Identifier.</param>
/// <param name="transaction">Transaction associated with this action.</param>
/// <returns>A resource with all asserted properties.</returns>
public IResource GetResource(Uri uri, ITransaction transaction = null)
{
ISparqlQuery query = new SparqlQuery("SELECT DISTINCT ?s ?p ?o " + DatasetClause + " WHERE { ?s ?p ?o. FILTER (?s = @subject) }");
query.Bind("@subject", uri);
ISparqlQueryResult result = ExecuteQuery(query, transaction: transaction);
IList resources = result.GetResources().ToList();
if (resources.Count > 0)
{
Resource r = resources[0] as Resource;
r.IsNew = false;
r.IsReadOnly = true;
r.IsSynchronized = true;
r.SetModel(this);
return((IResource)resources[0]);
}
else
{
throw new ResourceNotFoundException(uri);
}
}
/// <summary>
/// Retrieves a resource from the model.
/// </summary>
/// <param name="uri">A Uniform Resource Identifier.</param>
/// <param name="transaction">Transaction associated with this action.</param>
/// <returns>A resource with all asserted properties.</returns>
public IResource GetResource(Uri uri, ITransaction transaction = null)
{
ISparqlQuery query = new SparqlQuery("SELECT DISTINCT ?s ?p ?o FROM @model WHERE { ?s ?p ?o. FILTER (?s = @subject) }");
query.Bind("@model", this.Uri);
query.Bind("@subject", uri);
ISparqlQueryResult result = ExecuteQuery(query, transaction: transaction);
IEnumerable <Resource> resources = result.GetResources();
foreach (Resource r in resources)
{
r.IsNew = false;
r.IsSynchronized = true;
r.SetModel(this);
return(r);
}
throw new ResourceNotFoundException(uri);
}
