public void NodeAsValuedDateTime3()
{
INode orig = _graph.CreateLiteralNode("2013-06-19T09:58:00-07:00", UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeDateTime));
IValuedNode valued = orig.AsValuedNode();
Assert.AreEqual(16, valued.AsDateTime().Hour);
Assert.AreEqual(DateTimeKind.Utc, valued.AsDateTime().Kind);
}
/// <summary>
/// Compares two Date Times for Date Time ordering
/// </summary>
/// <param name="x">Node</param>
/// <param name="y">Node</param>
/// <returns></returns>
protected virtual int DateTimeCompare(IValuedNode x, IValuedNode y)
{
if (x == null || y == null)
{
throw new RdfQueryException("Cannot evaluate date time comparison when one or both arguments are Null");
}
try
{
DateTime c = x.AsDateTime();
DateTime d = y.AsDateTime();
switch (c.Kind)
{
case DateTimeKind.Unspecified:
if (d.Kind != DateTimeKind.Unspecified)
{
throw new RdfQueryException(
"Dates are incomparable, one specifies time zone information while the other does not");
}
break;
case DateTimeKind.Local:
if (d.Kind == DateTimeKind.Unspecified)
{
throw new RdfQueryException(
"Dates are incomparable, one specifies time zone information while the other does not");
}
c = c.ToUniversalTime();
if (d.Kind == DateTimeKind.Local)
{
d = d.ToUniversalTime();
}
break;
default:
if (d.Kind == DateTimeKind.Unspecified)
{
throw new RdfQueryException(
"Dates are incomparable, one specifies time zone information while the other does not");
}
if (d.Kind == DateTimeKind.Local)
{
d = d.ToUniversalTime();
}
break;
}
// Compare on unspecified/UTC form as appropriate
return(c.CompareTo(d));
}
catch (FormatException)
{
throw new RdfQueryException("Cannot evaluate date time comparison since one of the arguments does not have a valid lexical value for a Date");
}
}
/// <summary>
/// Compares two Date Times for Date Time ordering
/// </summary>
/// <param name="x">Node</param>
/// <param name="y">Node</param>
/// <returns></returns>
protected override int DateTimeCompare(IValuedNode x, IValuedNode y)
{
if (x == null || y == null)
{
throw new RdfQueryException("Cannot evaluate date time comparison when one or both arguments are Null");
}
try
{
DateTime c = x.AsDateTime();
DateTime d = y.AsDateTime();
switch (c.Kind)
{
case DateTimeKind.Unspecified:
// Sort unspecified lower than Local/UTC date
if (d.Kind != DateTimeKind.Unspecified)
{
return(-1);
}
break;
case DateTimeKind.Local:
// Sort Local higher than Unspecified
if (d.Kind == DateTimeKind.Unspecified)
{
return(1);
}
c = c.ToUniversalTime();
if (d.Kind == DateTimeKind.Local)
{
d = d.ToUniversalTime();
}
break;
default:
// Sort UTC higher than Unspecified
if (d.Kind == DateTimeKind.Unspecified)
{
return(1);
}
if (d.Kind == DateTimeKind.Local)
{
d = d.ToUniversalTime();
}
break;
}
// Compare on unspecified/UTC form as appropriate
return(c.CompareTo(d));
}
catch (FormatException)
{
throw new RdfQueryException("Cannot evaluate date time comparison since one of the arguments does not have a valid lexical value for a Date");
}
}
private static object GetPrimitiveValue(IValuedNode valuedNode, IEdmPrimitiveType targetType, bool asNullable)
{
// TODO: Some sort of cast to nullable when necessary
switch (targetType.PrimitiveKind)
{
case EdmPrimitiveTypeKind.Boolean:
return(valuedNode.AsBoolean());
case EdmPrimitiveTypeKind.Byte:
return((byte)valuedNode.AsInteger());
case EdmPrimitiveTypeKind.DateTime:
return(valuedNode.AsDateTime());
case EdmPrimitiveTypeKind.Decimal:
return(valuedNode.AsDecimal());
case EdmPrimitiveTypeKind.Double:
return(valuedNode.AsDouble());
case EdmPrimitiveTypeKind.Int16:
return((Int16)valuedNode.AsInteger());
case EdmPrimitiveTypeKind.Int32:
return((Int32)valuedNode.AsInteger());
case EdmPrimitiveTypeKind.Int64:
return(valuedNode.AsInteger());
case EdmPrimitiveTypeKind.String:
return(valuedNode.AsString());
case EdmPrimitiveTypeKind.DateTimeOffset:
return(valuedNode.AsDateTime());
default:
throw new NotSupportedException(
String.Format("Support for primitive type {0} has not been implemented yet",
targetType.PrimitiveKind));
}
}
/// <summary>
/// Compares two Dates for Date ordering
/// </summary>
/// <param name="x">Node</param>
/// <param name="y">Node</param>
/// <returns></returns>
protected virtual int DateCompare(IValuedNode x, IValuedNode y)
{
if (x == null || y == null)
{
throw new RdfQueryException("Cannot evaluate date comparison when one or both arguments are Null");
}
try
{
DateTime c = x.AsDateTime();
DateTime d = y.AsDateTime();
switch (c.Kind)
{
case DateTimeKind.Unspecified:
break;
case DateTimeKind.Local:
c = c.ToUniversalTime();
if (d.Kind == DateTimeKind.Local)
{
d = d.ToUniversalTime();
}
break;
default:
if (d.Kind == DateTimeKind.Local)
{
d = d.ToUniversalTime();
}
break;
}
// Timezone irrelevant for date comparisons since we don't have any time to normalize to
// Thus Open World Assumption means we can compare
// For Local times we normalize to UTC
// Compare on the Unspecified/UTC form as appropriate
int res = c.Year.CompareTo(d.Year);
if (res == 0)
{
res = c.Month.CompareTo(d.Month);
if (res == 0)
{
res = c.Day.CompareTo(d.Day);
}
}
return(res);
}
catch (FormatException)
{
throw new RdfQueryException("Cannot evaluate date comparison since one of the arguments does not have a valid lexical value for a Date");
}
}
/// <summary>
/// Gets the numeric value of the function in the given Evaluation Context for the given Binding ID
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
public override IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
IValuedNode temp = this._expr.Evaluate(context, bindingID);
if (temp != null)
{
return(this.ValueInternal(temp.AsDateTime()));
}
else
{
throw new RdfQueryException("Unable to evaluate an XPath Date Time function on a null argument");
}
}
/// <summary>
/// Calculates the value of the function in the given Evaluation Context for the given Binding ID
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
public virtual IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
IValuedNode temp = this._expr.Evaluate(context, bindingID);
if (temp != null)
{
DateTimeOffset dt = temp.AsDateTime();
//Regex based check to see if the value has a Timezone component
//If not then the result is a null
if (!Regex.IsMatch(temp.AsString(), "(Z|[+-]\\d{2}:\\d{2})$"))
{
return(null);
}
//Now we have a DateTime we can try and return the Timezone
if (dt.Offset.Equals(TimeSpan.Zero))
{
//If Zero it was specified as Z (which means UTC so zero offset)
return(new StringNode(null, "PT0S", UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeDayTimeDuration)));
}
else
{
//If the Offset is outside the range -14 to 14 this is considered invalid
if (dt.Offset.Hours < -14 || dt.Offset.Hours > 14)
{
return(null);
}
//Otherwise it has an offset which is a given number of hours and minutse
string offset = "PT" + Math.Abs(dt.Offset.Hours) + "H";
if (dt.Offset.Hours < 0)
{
offset = "-" + offset;
}
if (dt.Offset.Minutes != 0)
{
offset = offset + Math.Abs(dt.Offset.Minutes) + "M";
}
if (dt.Offset.Hours == 0 && dt.Offset.Minutes < 0)
{
offset = "-" + offset;
}
return(new StringNode(null, offset, UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeDayTimeDuration)));
}
}
else
{
throw new RdfQueryException("Unable to evaluate an XPath Date Time function on a null argument");
}
}
/// <summary>
/// Compares two Date Times for Date Time ordering
/// </summary>
/// <param name="x">Node</param>
/// <param name="y">Node</param>
/// <returns></returns>
protected int DateTimeCompare(IValuedNode x, IValuedNode y)
{
if (x == null || y == null)
{
throw new RdfQueryException("Cannot evaluate date time equality when one or both arguments are Null");
}
try
{
DateTimeOffset a = x.AsDateTime();
DateTimeOffset b = y.AsDateTime();
if (!a.Offset.Equals(b.Offset))
{
throw new RdfQueryException("Cannot order Dates which are from different time zones");
}
return(a.CompareTo(b));
}
catch (FormatException)
{
throw new RdfQueryException("Cannot evaluate date time equality since one of the arguments does not have a valid lexical value for a Date Time");
}
}
/// <summary>
/// Gets the Timezone of the Argument Expression as evaluated for the given Binding in the given Context
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
public override IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
IValuedNode temp = this._expr.Evaluate(context, bindingID);
if (temp != null)
{
DateTimeOffset dt = temp.AsDateTime();
//Regex based check to see if the value has a Timezone component
//If not then the result is a null
if (!Regex.IsMatch(temp.AsString(), "(Z|[+-]\\d{2}:\\d{2})$"))
{
return(new StringNode(null, string.Empty));
}
//Now we have a DateTime we can try and return the Timezone
if (dt.Offset.Equals(TimeSpan.Zero))
{
//If Zero it was specified as Z (which means UTC so zero offset)
return(new StringNode(null, "Z"));
}
else
{
//If the Offset is outside the range -14 to 14 this is considered invalid
if (dt.Offset.Hours < -14 || dt.Offset.Hours > 14)
{
return(null);
}
//Otherwise it has an offset which is a given number of hours (and minutes)
return(new StringNode(null, dt.Offset.Hours.ToString("00") + ":" + dt.Offset.Minutes.ToString("00")));
}
}
else
{
throw new RdfQueryException("Unable to evaluate a Date Time function on a null argument");
}
}
/// <summary>
/// Casts the value of the inner Expression to a Date Time.
/// </summary>
/// <param name="context">Evaluation Context.</param>
/// <param name="bindingID">Binding ID.</param>
/// <returns></returns>
public override IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
IValuedNode n = _expr.Evaluate(context, bindingID);//.CoerceToDateTime();
if (n == null)
{
throw new RdfQueryException("Cannot cast a Null to a xsd:dateTime");
}
// New method should be much faster
// if (n is DateTimeNode) return n;
// if (n is DateNode) return new DateTimeNode(n.Graph, n.AsDateTime());
// return new DateTimeNode(null, n.AsDateTime());
switch (n.NodeType)
{
case NodeType.Blank:
case NodeType.GraphLiteral:
case NodeType.Uri:
throw new RdfQueryException("Cannot cast a Blank/URI/Graph Literal Node to a xsd:dateTime");
case NodeType.Literal:
if (n is DateTimeNode)
{
return(n);
}
if (n is DateNode)
{
return(new DateTimeNode(n.Graph, n.AsDateTime()));
}
// See if the value can be cast
ILiteralNode lit = (ILiteralNode)n;
if (lit.DataType != null)
{
string dt = lit.DataType.ToString();
if (dt.Equals(XmlSpecsHelper.XmlSchemaDataTypeDateTime))
{
// Already a xsd:dateTime
DateTimeOffset d;
if (DateTimeOffset.TryParse(lit.Value, out d))
{
// Parsed OK
return(new DateTimeNode(lit.Graph, d));
}
else
{
throw new RdfQueryException("Invalid lexical form for xsd:dateTime");
}
}
else if (dt.Equals(XmlSpecsHelper.XmlSchemaDataTypeString))
{
DateTimeOffset d;
if (DateTimeOffset.TryParse(lit.Value, out d))
{
// Parsed OK
return(new DateTimeNode(lit.Graph, d));
}
else
{
throw new RdfQueryException("Cannot cast the value '" + lit.Value + "' to a xsd:double");
}
}
else
{
throw new RdfQueryException("Cannot cast a Literal typed <" + dt + "> to a xsd:dateTime");
}
}
else
{
DateTimeOffset d;
if (DateTimeOffset.TryParse(lit.Value, out d))
{
// Parsed OK
return(new DateTimeNode(lit.Graph, d));
}
else
{
throw new RdfQueryException("Cannot cast the value '" + lit.Value + "' to a xsd:dateTime");
}
}
default:
throw new RdfQueryException("Cannot cast an Unknown Node to a xsd:string");
}
}
private static object GetPrimitiveValue(IValuedNode valuedNode, IEdmPrimitiveType targetType, bool asNullable)
{
// TODO: Some sort of cast to nullable when necessary
switch (targetType.PrimitiveKind)
{
case EdmPrimitiveTypeKind.Boolean:
return valuedNode.AsBoolean();
case EdmPrimitiveTypeKind.Byte:
return (byte) valuedNode.AsInteger();
case EdmPrimitiveTypeKind.DateTime:
return valuedNode.AsDateTime();
case EdmPrimitiveTypeKind.Decimal:
return valuedNode.AsDecimal();
case EdmPrimitiveTypeKind.Double:
return valuedNode.AsDouble();
case EdmPrimitiveTypeKind.Int16:
return (Int16) valuedNode.AsInteger();
case EdmPrimitiveTypeKind.Int32:
return (Int32) valuedNode.AsInteger();
case EdmPrimitiveTypeKind.Int64:
return valuedNode.AsInteger();
case EdmPrimitiveTypeKind.String:
return valuedNode.AsString();
case EdmPrimitiveTypeKind.DateTimeOffset:
return valuedNode.AsDateTime();
default:
throw new NotSupportedException(
String.Format("Support for primitive type {0} has not been implemented yet",
targetType.PrimitiveKind));
}
}
