/// <summary>
/// Default ctor to build a typed literal with value and default "xsd:string" datatype
/// </summary>
public RDFTypedLiteral(String value) {
this.Value = (value ?? String.Empty);
this.Datatype = RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "string");
this.PatternMemberID = RDFModelUtilities.CreateHash(this.ToString());
if (!RDFModelUtilities.ValidateTypedLiteral(this)) {
throw new RDFModelException("Cannot create RDFTypedLiteral because given \"value\" parameter is not well-formed or not compatible with the category of the datatype.");
}
}
/// <summary>
/// Default ctor to build a typed literal with value and datatype
/// </summary>
public RDFTypedLiteral(String value, RDFDatatype datatype) {
if (datatype != null) {
this.Value = (value ?? String.Empty);
this.Datatype = datatype;
this.PatternMemberID = RDFModelUtilities.CreateHash(this.ToString());
if (!RDFModelUtilities.ValidateTypedLiteral(this)) {
throw new RDFModelException("Cannot create RDFTypedLiteral because given \"value\" parameter is not well-formed or compatible with the category of the datatype.");
}
}
}
/// <summary>
/// Default-ctor to build a filter on the given variable for the given datatype
/// </summary>
public RDFDatatypeFilter(RDFVariable variable, RDFDatatype datatype) {
if (variable != null) {
if (datatype != null) {
this.Variable = variable;
this.Datatype = datatype;
this.FilterID = RDFModelUtilities.CreateHash(this.ToString());
}
else {
throw new RDFQueryException("Cannot create RDFDatatypeFilter because \"datatype\" parameter is null.");
}
}
else {
throw new RDFQueryException("Cannot create RDFDatatypeFilter because \"variable\" parameter is null.");
}
}
/// <summary>
/// Tries to parse the given string in order to build the corresponding datatype
/// </summary>
internal static RDFDatatype GetDatatypeFromString(String datatypeString) {
if (datatypeString != null && datatypeString.Trim() != String.Empty) {
Uri datatypeUri = RDFModelUtilities.GetUriFromString(datatypeString);
if (datatypeUri == null) {
throw new RDFModelException("Cannot create RDFDatatype because given \"datatypeString\" (" + datatypeString + ") parameter cannot be converted to a valid Uri");
}
String type = null;
String ns = null;
RDFDatatype dt = null;
// e.g.: "http://www.w3.org/2001/XMLSchema#integer"
if (datatypeUri.Fragment != String.Empty) {
type = datatypeUri.Fragment.TrimStart(new Char[] { '#' }); //"integer"
ns = datatypeUri.AbsoluteUri.TrimEnd(type.ToCharArray()); //"http://www.w3.org/2001/XMLSchema#"
}
// e.g.: "http://example.org/integer" or "ex:integer"
else {
type = datatypeUri.Segments[datatypeUri.Segments.Length - 1]; //"integer"
ns = datatypeUri.AbsoluteUri.TrimEnd(type.ToCharArray()); //"http://example.org/" or "ex:"
}
//First try to search the register for prefix and datatype
if (ns.EndsWith(":")) {
ns = ns.TrimEnd(':');
dt = RDFDatatypeRegister.GetByPrefixAndDatatype(ns, type);
}
//If nothing found, try to search the register for namespace and datatype
if(dt == null) {
dt = RDFDatatypeRegister.GetByNamespaceAndDatatype(ns, type);
//If nothing found, we must create and register a new datatype
if (dt == null) {
//First try to find a namespace to work with
RDFNamespace nSpace =
(RDFNamespaceRegister.GetByNamespace(ns) ??
RDFModelUtilities.GenerateNamespace(ns, true));
//If nothing found, we also have to create a new datatype
dt = new RDFDatatype(nSpace.Prefix, nSpace.Namespace, type, RDFModelEnums.RDFDatatypeCategory.String);
}
}
return dt;
}
throw new RDFModelException("Cannot create RDFDatatype because given \"datatypeString\" parameter is null or empty");
}
