/// <summary>
/// Builds a new difference store from this store and a given one
/// </summary>
public RDFMemoryStore DifferenceWith(RDFStore store)
{
RDFMemoryStore result = new RDFMemoryStore();
if (store != null)
{
//Add difference quadruples
foreach (RDFQuadruple q in this)
{
if (!store.ContainsQuadruple(q))
{
result.AddQuadruple(q);
}
}
}
else
{
//Add quadruples from this store
foreach (RDFQuadruple q in this)
{
result.AddQuadruple(q);
}
}
return(result);
}
/// <summary>
/// Builds the reification store of the quadruple
/// </summary>
public RDFStore ReifyQuadruple()
{
RDFStore reifStore = new RDFMemoryStore();
reifStore.AddQuadruple(new RDFQuadruple((RDFContext)this.Context, this.ReificationSubject, RDFVocabulary.RDF.TYPE, RDFVocabulary.RDF.STATEMENT));
reifStore.AddQuadruple(new RDFQuadruple((RDFContext)this.Context, this.ReificationSubject, RDFVocabulary.RDF.SUBJECT, (RDFResource)this.Subject));
reifStore.AddQuadruple(new RDFQuadruple((RDFContext)this.Context, this.ReificationSubject, RDFVocabulary.RDF.PREDICATE, (RDFResource)this.Predicate));
if (this.TripleFlavor == RDFModelEnums.RDFTripleFlavor.SPO)
{
reifStore.AddQuadruple(new RDFQuadruple((RDFContext)this.Context, this.ReificationSubject, RDFVocabulary.RDF.OBJECT, (RDFResource)this.Object));
}
else
{
reifStore.AddQuadruple(new RDFQuadruple((RDFContext)this.Context, this.ReificationSubject, RDFVocabulary.RDF.OBJECT, (RDFLiteral)this.Object));
}
return(reifStore);
}
/// <summary>
/// Builds a new union store from this store and a given one
/// </summary>
public RDFMemoryStore UnionWith(RDFStore store)
{
RDFMemoryStore result = new RDFMemoryStore();
//Add quadruples from this store
foreach (RDFQuadruple q in this)
{
result.AddQuadruple(q);
}
//Manage the given store
if (store != null)
{
//Add quadruples from the given store
foreach (RDFQuadruple q in store.SelectAllQuadruples())
{
result.AddQuadruple(q);
}
}
return(result);
}
/// <summary>
/// Builds a new intersection store from this store and a given one
/// </summary>
public RDFMemoryStore IntersectWith(RDFStore store)
{
RDFMemoryStore result = new RDFMemoryStore();
if (store != null)
{
//Add intersection quadruples
foreach (RDFQuadruple q in this)
{
if (store.ContainsQuadruple(q))
{
result.AddQuadruple(q);
}
}
}
return(result);
}
/// <summary>
/// Reads a memory store from a datatable with "Context-Subject-Predicate-Object" columns.
/// </summary>
public static RDFMemoryStore FromDataTable(DataTable table)
{
RDFMemoryStore result = new RDFMemoryStore();
//Check the structure of the datatable for consistency against the "C-S-P-O" RDF model
if (table != null && table.Columns.Count == 4)
{
if (table.Columns.Contains("?CONTEXT") &&
table.Columns.Contains("?SUBJECT") &&
table.Columns.Contains("?PREDICATE") &&
table.Columns.Contains("?OBJECT"))
{
//Iterate the rows of the datatable
foreach (DataRow tableRow in table.Rows)
{
#region CONTEXT
//Parse the quadruple context
if (!tableRow.IsNull("?CONTEXT") && !string.IsNullOrEmpty(tableRow["?CONTEXT"].ToString()))
{
var rowCont = RDFQueryUtilities.ParseRDFPatternMember(tableRow["?CONTEXT"].ToString());
if (rowCont is RDFResource && !((RDFResource)rowCont).IsBlank)
{
#region SUBJECT
//Parse the quadruple subject
if (!tableRow.IsNull("?SUBJECT") && !string.IsNullOrEmpty(tableRow["?SUBJECT"].ToString()))
{
var rowSubj = RDFQueryUtilities.ParseRDFPatternMember(tableRow["?SUBJECT"].ToString());
if (rowSubj is RDFResource)
{
#region PREDICATE
//Parse the quadruple predicate
if (!tableRow.IsNull("?PREDICATE") && !string.IsNullOrEmpty(tableRow["?PREDICATE"].ToString()))
{
var rowPred = RDFQueryUtilities.ParseRDFPatternMember(tableRow["?PREDICATE"].ToString());
if (rowPred is RDFResource && !((RDFResource)rowPred).IsBlank)
{
#region OBJECT
//Parse the quadruple object
if (!tableRow.IsNull("?OBJECT"))
{
var rowObj = RDFQueryUtilities.ParseRDFPatternMember(tableRow["?OBJECT"].ToString());
if (rowObj is RDFResource)
{
result.AddQuadruple(new RDFQuadruple(new RDFContext(rowCont.ToString()), (RDFResource)rowSubj, (RDFResource)rowPred, (RDFResource)rowObj));
}
else
{
result.AddQuadruple(new RDFQuadruple(new RDFContext(rowCont.ToString()), (RDFResource)rowSubj, (RDFResource)rowPred, (RDFLiteral)rowObj));
}
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter contains a row having NULL value in the \"?OBJECT\" column.");
}
#endregion
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter contains a row having a blank resource or a literal in the \"?PREDICATE\" column.");
}
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter contains a row having NULL or empty value in the \"?PREDICATE\" column.");
}
#endregion
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter contains a row not having a resource in the \"?SUBJECT\" column.");
}
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter contains a row having NULL or empty value in the \"?SUBJECT\" column.");
}
#endregion
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter contains a row having a blank resource or a literal in the \"?CONTEXT\" column.");
}
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter contains a row having NULL or empty value in the \"?CONTEXT\" column.");
}
#endregion
}
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter does not have the required columns \"?CONTEXT\", \"?SUBJECT\", \"?PREDICATE\", \"?OBJECT\".");
}
}
else
{
throw new RDFStoreException("Cannot read RDF memory store from datatable because given \"table\" parameter is null, or it does not have exactly 4 columns.");
}
return(result);
}
/// <summary>
/// Deserializes the given N-Quads stream to a memory store.
/// </summary>
internal static RDFMemoryStore Deserialize(Stream inputStream)
{
Int64 nquadIndex = 0;
try {
#region deserialize
using (StreamReader sr = new StreamReader(inputStream)) {
RDFMemoryStore result = new RDFMemoryStore();
String nquad = String.Empty;
String[] tokens = new String[4];
RDFResource S = null;
RDFResource P = null;
RDFResource O = null;
RDFLiteral L = null;
RDFContext C = new RDFContext();
while ((nquad = sr.ReadLine()) != null)
{
nquadIndex++;
#region sanitize & tokenize
//Cleanup previous data
S = null;
tokens[0] = String.Empty;
P = null;
tokens[1] = String.Empty;
O = null;
L = null;
tokens[2] = String.Empty;
C = new RDFContext();
tokens[3] = String.Empty;
//Preliminary sanitizations: clean trailing space-like chars
nquad = nquad.Trim(new Char[] { ' ', '\t', '\r', '\n' });
//Skip empty or comment lines
if (nquad == String.Empty || nquad.StartsWith("#"))
{
continue;
}
//Tokenizes the sanitized quad
tokens = TokenizeNQuad(nquad);
#endregion
#region subj
String subj = tokens[0].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:");
S = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(subj));
#endregion
#region pred
String pred = tokens[1].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
P = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(pred));
#endregion
#region object
if (tokens[2].StartsWith("<") ||
tokens[2].StartsWith("bnode:") ||
tokens[2].StartsWith("_:"))
{
String obj = tokens[2].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:")
.Trim(new Char[] { ' ', '\n', '\t', '\r' });
O = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(obj));
}
#endregion
#region literal
else
{
#region sanitize
tokens[2] = RDFNTriples.regexSqt.Replace(tokens[2], String.Empty);
tokens[2] = RDFNTriples.regexEqt.Replace(tokens[2], String.Empty);
tokens[2] = tokens[2].Replace("\\\"", "\"")
.Replace("\\n", "\n")
.Replace("\\t", "\t")
.Replace("\\r", "\r");
tokens[2] = RDFModelUtilities.ASCII_To_Unicode(tokens[2]);
#endregion
#region plain literal
if (!tokens[2].Contains("^^") ||
tokens[2].EndsWith("^^") ||
tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2, 1) != "<")
{
if (RDFNTriples.regexLPL.Match(tokens[2]).Success)
{
tokens[2] = tokens[2].Replace("\"@", "@");
String pLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("@", StringComparison.Ordinal));
String pLitLang = tokens[2].Substring(tokens[2].LastIndexOf("@", StringComparison.Ordinal) + 1);
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(pLitValue), pLitLang);
}
else
{
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(tokens[2]));
}
}
#endregion
#region typed literal
else
{
tokens[2] = tokens[2].Replace("\"^^", "^^");
String tLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("^^", StringComparison.Ordinal));
String tLitDatatype = tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2)
.TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
RDFModelEnums.RDFDatatype dt = RDFModelUtilities.GetDatatypeFromString(tLitDatatype);
L = new RDFTypedLiteral(HttpUtility.HtmlDecode(tLitValue), dt);
}
#endregion
}
#endregion
#region context
if (!String.IsNullOrEmpty(tokens[3]))
{
String ctx = tokens[3].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
Uri ctxUri = null;
if (Uri.TryCreate(ctx, UriKind.Absolute, out ctxUri))
{
C = new RDFContext(RDFModelUtilities.ASCII_To_Unicode(ctxUri.ToString()));
}
else
{
throw new RDFModelException("found context '" + ctx + "' which is not a well-formed absolute Uri");
}
}
#endregion
#region addquadruple
if (O != null)
{
result.AddQuadruple(new RDFQuadruple(C, S, P, O));
}
else
{
result.AddQuadruple(new RDFQuadruple(C, S, P, L));
}
#endregion
}
return(result);
}
#endregion
}
catch (Exception ex) {
throw new RDFModelException("Cannot deserialize N-Quads (line " + nquadIndex + ") because: " + ex.Message, ex);
}
}
