/// <summary>
/// Gets the value of a member of the Group for concatenating as part of the result for the Group
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
protected virtual String ValueInternal(SparqlEvaluationContext context, int bindingID)
{
IValuedNode temp = this._expr.Evaluate(context, bindingID);
if (temp == null)
{
throw new RdfQueryException("Cannot do an XPath string-join on a null");
}
if (temp.NodeType == NodeType.Literal)
{
ILiteralNode l = (ILiteralNode)temp;
if (l.DataType != null)
{
if (l.DataType.AbsoluteUri.Equals(XmlSpecsHelper.XmlSchemaDataTypeString))
{
return(temp.AsString());
}
else
{
throw new RdfQueryException("Cannot do an XPath string-join on a Literal which is not typed as a String");
}
}
else
{
return(temp.AsString());
}
}
else
{
throw new RdfQueryException("Cannot do an XPath string-join on a non-Literal Node");
}
}
/// <summary>
/// Gets 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 override IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
IValuedNode temp = this._expr.Evaluate(context, bindingID);
if (temp != null)
{
switch (temp.NodeType)
{
case NodeType.Blank:
throw new RdfQueryException("Cannot calculate the Hash of a Blank Node");
case NodeType.GraphLiteral:
throw new RdfQueryException("Cannot calculate the Hash of a Graph Literal");
case NodeType.Literal:
return(new StringNode(null, this.Hash(((ILiteralNode)temp).Value)));
case NodeType.Uri:
return(new StringNode(null, this.Hash(temp.AsString())));
default:
throw new RdfQueryException("Cannot calculate the Hash of an Unknown Node Type");
}
}
else
{
throw new RdfQueryException("Cannot calculate the Hash of a null");
}
}
public static List <Pokemon> resultsToObject(SparqlResultSet results, IEnumerable <string> names)
{
List <Pokemon> pokemons = new List <Pokemon>();
results.Results.ForEach(row => {
string pkName = row.ElementAt(0).Value.AsValuedNode().AsString();
if (!pokemons.Exists(pk => pk.name == pkName))
{
Pokemon pokemon = new Pokemon(pkName, new List <Values>());
pokemons.Add(pokemon);
}
for (int i = 1; i < row.Count; i++)
{
Pokemon pokemon = pokemons.Find(pk => pk.name == pkName);
string valName = names.ElementAt(i - 1);
if (!pokemon.values.Exists(val => val.name == valName))
{
pokemon.values.Add(new Values(valName, new List <string>()));
}
Values values = pokemon.values.Find(val => val.name == valName);
IValuedNode value = row[i].AsValuedNode();
string val = (value != null) ? value.AsString() : "";
if (!values.vals.Exists(v => v == val))
{
values.vals.Add(val);
}
}
});
return(pokemons);
}
/// <summary>
/// Configures the Options for the Regular Expression
/// </summary>
/// <param name="n">Node detailing the Options</param>
/// <param name="throwErrors">Whether errors should be thrown or suppressed</param>
private void ConfigureOptions(IValuedNode n, bool throwErrors)
{
// Start by resetting to no options
this._options = RegexOptions.None;
if (n == null)
{
if (throwErrors)
{
throw new RdfQueryException("REGEX Options Expression does not produce an Options string");
}
}
else
{
if (n.NodeType == NodeType.Literal)
{
string ops = n.AsString();
foreach (char c in ops.ToCharArray())
{
switch (c)
{
case 'i':
this._options |= RegexOptions.IgnoreCase;
break;
case 'm':
this._options |= RegexOptions.Multiline;
break;
case 's':
this._options |= RegexOptions.Singleline;
break;
case 'x':
this._options |= RegexOptions.IgnorePatternWhitespace;
break;
default:
if (throwErrors)
{
throw new RdfQueryException("Invalid flag character '" + c + "' in Options string");
}
break;
}
}
}
else
{
if (throwErrors)
{
throw new RdfQueryException("REGEX Options Expression does not produce an Options string");
}
}
}
}
/// <summary>
/// Casts the results of the inner expression to a Literal Node typed xsd:string.
/// </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);
if (n == null)
{
throw new RdfQueryException("Cannot cast a Null to a xsd:string");
}
return(new StringNode(null, n.AsString(), UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeString)));
}
/// <summary>
/// Creates a new SPARQL Replace function.
/// </summary>
/// <param name="text">Text Expression.</param>
/// <param name="find">Search Expression.</param>
/// <param name="replace">Replace Expression.</param>
/// <param name="options">Options Expression.</param>
public ReplaceFunction(ISparqlExpression text, ISparqlExpression find, ISparqlExpression replace, ISparqlExpression options)
{
_textExpr = text;
// Get the Pattern
if (find is ConstantTerm)
{
// If the Pattern is a Node Expression Term then it is a fixed Pattern
IValuedNode n = find.Evaluate(null, 0);
if (n.NodeType == NodeType.Literal)
{
// Try to parse as a Regular Expression
try
{
string p = n.AsString();
Regex temp = new Regex(p);
// It's a Valid Pattern
_fixedPattern = true;
_find = p;
}
catch
{
// No catch actions
}
}
}
_findExpr = find;
// Get the Replace
if (replace is ConstantTerm)
{
// If the Replace is a Node Expresison Term then it is a fixed Pattern
IValuedNode n = replace.Evaluate(null, 0);
if (n.NodeType == NodeType.Literal)
{
_replace = n.AsString();
_fixedReplace = true;
}
}
_replaceExpr = replace;
// Get the Options
if (options != null)
{
if (options is ConstantTerm)
{
ConfigureOptions(options.Evaluate(null, 0), false);
}
_optionExpr = options;
}
}
/// <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 = _expr.Evaluate(context, bindingID);
if (temp != null)
{
DateTimeOffset dt = temp.AsDateTimeOffset();
// 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>
/// Gets 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 IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
StringBuilder output = new StringBuilder();
for (int i = 0; i < _exprs.Count; i++)
{
IValuedNode temp = _exprs[i].Evaluate(context, bindingID);
if (temp == null)
{
throw new RdfQueryException("Cannot evaluate the ARQ string-join() function when an argument evaluates to a Null");
}
switch (temp.NodeType)
{
case NodeType.Literal:
output.Append(temp.AsString());
break;
default:
throw new RdfQueryException("Cannot evaluate the ARQ string-join() function when an argument is not a Literal Node");
}
if (i < _exprs.Count - 1)
{
if (_fixedSeparator)
{
output.Append(_separator);
}
else
{
IValuedNode sep = _sep.Evaluate(context, bindingID);
if (sep == null)
{
throw new RdfQueryException("Cannot evaluate the ARQ strjoin() function when the separator expression evaluates to a Null");
}
if (sep.NodeType == NodeType.Literal)
{
output.Append(sep.AsString());
}
else
{
throw new RdfQueryException("Cannot evaluate the ARQ strjoin() function when the separator expression evaluates to a non-Literal Node");
}
}
}
}
return(new StringNode(null, output.ToString(), UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeString)));
}
/// <summary>
/// Gets the value of the aggregate for the given binding
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
protected override string ValueInternal(SparqlEvaluationContext context, int bindingID)
{
IValuedNode temp = this._expr.Evaluate(context, bindingID);
if (temp == null)
{
throw new RdfQueryException("Cannot do an XPath string-join on a null");
}
switch (temp.NodeType)
{
case NodeType.Literal:
case NodeType.Uri:
return(temp.AsString());
default:
throw new RdfQueryException("Cannot do an XPath string-join on a non-Literal Node");
}
}
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>
/// Creates a new ARQ String Join function
/// </summary>
/// <param name="sepExpr">Separator Expression</param>
/// <param name="expressions">Expressions to concatentate</param>
public StringJoinFunction(ISparqlExpression sepExpr, IEnumerable <ISparqlExpression> expressions)
{
if (sepExpr is ConstantTerm)
{
IValuedNode temp = sepExpr.Evaluate(null, 0);
if (temp.NodeType == NodeType.Literal)
{
_separator = temp.AsString();
_fixedSeparator = true;
}
else
{
_sep = sepExpr;
}
}
else
{
_sep = sepExpr;
}
_exprs.AddRange(expressions);
}
/// <summary>
/// Returns the value of the Expression as evaluated for a given Binding as a Literal Node
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
public override IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
IValuedNode result = _expr.Evaluate(context, bindingID);
if (result == null)
{
throw new RdfQueryException("Cannot return the lexical value of an NULL");
}
else
{
switch (result.NodeType)
{
case NodeType.Literal:
case NodeType.Uri:
return(new StringNode(null, result.AsString()));
default:
throw new RdfQueryException("Cannot return the lexical value of Nodes which are not Literal/URI Nodes");
}
}
}
/// <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>
/// Gets the Value of the function as evaluated in the given Context for the given Binding ID
/// </summary>
/// <param name="context">Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
public IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
StringBuilder output = new StringBuilder();
foreach (ISparqlExpression expr in this._exprs)
{
IValuedNode temp = expr.Evaluate(context, bindingID);
if (temp == null)
{
throw new RdfQueryException("Cannot evaluate the XPath concat() function when an argument evaluates to a Null");
}
switch (temp.NodeType)
{
case NodeType.Literal:
output.Append(temp.AsString());
break;
default:
throw new RdfQueryException("Cannot evaluate the XPath concat() function when an argument is not a Literal Node");
}
}
return(new StringNode(null, output.ToString(), UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeString)));
}
/// <summary>
/// Configures the Options for the Regular Expression
/// </summary>
/// <param name="n">Node detailing the Options</param>
/// <param name="throwErrors">Whether errors should be thrown or suppressed</param>
private void ConfigureOptions(IValuedNode n, bool throwErrors)
{
//Start by resetting to no options
this._options = RegexOptions.None;
if (n == null)
{
if (throwErrors)
{
throw new RdfQueryException("REGEX Options Expression does not produce an Options string");
}
}
else
{
if (n.NodeType == NodeType.Literal)
{
string ops = n.AsString();
foreach (char c in ops.ToCharArray())
{
switch (c)
{
case 'i':
this._options |= RegexOptions.IgnoreCase;
break;
case 'm':
this._options |= RegexOptions.Multiline;
break;
case 's':
this._options |= RegexOptions.Singleline;
break;
case 'x':
this._options |= RegexOptions.IgnorePatternWhitespace;
break;
default:
if (throwErrors)
{
throw new RdfQueryException("Invalid flag character '" + c + "' in Options string");
}
break;
}
}
}
else
{
if (throwErrors)
{
throw new RdfQueryException("REGEX Options Expression does not produce an Options string");
}
}
}
}
/// <summary>
/// Evaluates the expression
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
public IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
// Configure Options
if (this._optionExpr != null && !this._fixedOptions)
{
this.ConfigureOptions(this._optionExpr.Evaluate(context, bindingID), true);
}
// Compile the Regex if necessary
if (!this._fixedPattern)
{
// Regex is not pre-compiled
if (this._patternExpr != null)
{
IValuedNode p = this._patternExpr.Evaluate(context, bindingID);
if (p != null)
{
if (p.NodeType == NodeType.Literal)
{
this._pattern = p.AsString();
}
else
{
throw new RdfQueryException("Cannot parse a Pattern String from a non-Literal Node");
}
}
else
{
throw new RdfQueryException("Not a valid Pattern Expression");
}
}
else
{
throw new RdfQueryException("Not a valid Pattern Expression or the fixed Pattern String was invalid");
}
}
// Execute the Regular Expression
IValuedNode textNode = this._textExpr.Evaluate(context, bindingID);
if (textNode == null)
{
throw new RdfQueryException("Cannot evaluate a Regular Expression against a NULL");
}
if (textNode.NodeType == NodeType.Literal)
{
// Execute
string text = textNode.AsString();
if (this._regex != null)
{
return(new BooleanNode(null, this._regex.IsMatch(text)));
}
else
{
return(new BooleanNode(null, Regex.IsMatch(text, this._pattern, this._options)));
}
}
else
{
throw new RdfQueryException("Cannot evaluate a Regular Expression against a non-Literal Node");
}
}
/// <summary>
/// Returns the value of the Expression as evaluated for a given Binding as a Literal Node.
/// </summary>
/// <param name="context">Evaluation Context.</param>
/// <param name="bindingID">Binding ID.</param>
/// <returns></returns>
public IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
// Configure Options
if (_optionExpr != null)
{
ConfigureOptions(_optionExpr.Evaluate(context, bindingID), true);
}
// Compile the Regex if necessary
if (!_fixedPattern)
{
// Regex is not pre-compiled
if (_findExpr != null)
{
IValuedNode p = _findExpr.Evaluate(context, bindingID);
if (p != null)
{
if (p.NodeType == NodeType.Literal)
{
_find = p.AsString();
}
else
{
throw new RdfQueryException("Cannot parse a Pattern String from a non-Literal Node");
}
}
else
{
throw new RdfQueryException("Not a valid Pattern Expression");
}
}
else
{
throw new RdfQueryException("Not a valid Pattern Expression or the fixed Pattern String was invalid");
}
}
// Compute the Replace if necessary
if (!_fixedReplace)
{
if (_replaceExpr != null)
{
IValuedNode r = _replaceExpr.Evaluate(context, bindingID);
if (r != null)
{
if (r.NodeType == NodeType.Literal)
{
_replace = r.AsString();
}
else
{
throw new RdfQueryException("Cannot parse a Replace String from a non-Literal Node");
}
}
else
{
throw new RdfQueryException("Not a valid Replace Expression");
}
}
else
{
throw new RdfQueryException("Not a valid Replace Expression");
}
}
// Execute the Regular Expression
IValuedNode textNode = _textExpr.Evaluate(context, bindingID);
if (textNode == null)
{
throw new RdfQueryException("Cannot evaluate a Regular Expression against a NULL");
}
if (textNode.NodeType == NodeType.Literal)
{
// Execute
ILiteralNode lit = (ILiteralNode)textNode;
if (lit.DataType != null && !lit.DataType.AbsoluteUri.Equals(XmlSpecsHelper.XmlSchemaDataTypeString))
{
throw new RdfQueryException("Text Argument to Replace must be of type xsd:string if a datatype is specified");
}
string text = lit.Value;
string output = Regex.Replace(text, _find, _replace, _options);
if (lit.DataType != null)
{
return(new StringNode(null, output, lit.DataType));
}
else if (!lit.Language.Equals(string.Empty))
{
return(new StringNode(null, output, lit.Language));
}
else
{
return(new StringNode(null, output));
}
}
else
{
throw new RdfQueryException("Cannot evaluate a Regular Expression against a non-Literal Node");
}
}
/// <summary>
/// Applies the aggregate over the given bindings
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingIDs">Binding IDs</param>
/// <returns></returns>
public override IValuedNode Apply(SparqlEvaluationContext context, IEnumerable <int> bindingIDs)
{
IValuedNode n = base.Apply(context, bindingIDs);
return(new StringNode(n.Graph, n.AsString()));
}
/// <summary>
/// Returns the value of the Expression as evaluated for a given Binding as a Literal Node
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingID">Binding ID</param>
/// <returns></returns>
public IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
// Configure Options
if (this._optionExpr != null)
{
this.ConfigureOptions(this._optionExpr.Evaluate(context, bindingID), true);
}
// Compile the Regex if necessary
if (!this._fixedPattern)
{
// Regex is not pre-compiled
if (this._findExpr != null)
{
IValuedNode p = this._findExpr.Evaluate(context, bindingID);
if (p != null)
{
if (p.NodeType == NodeType.Literal)
{
this._find = p.AsString();
}
else
{
throw new RdfQueryException("Cannot parse a Pattern String from a non-Literal Node");
}
}
else
{
throw new RdfQueryException("Not a valid Pattern Expression");
}
}
else
{
throw new RdfQueryException("Not a valid Pattern Expression or the fixed Pattern String was invalid");
}
}
// Compute the Replace if necessary
if (!this._fixedReplace)
{
if (this._replaceExpr != null)
{
IValuedNode r = this._replaceExpr.Evaluate(context, bindingID);
if (r != null)
{
if (r.NodeType == NodeType.Literal)
{
this._replace = r.AsString();
}
else
{
throw new RdfQueryException("Cannot parse a Replace String from a non-Literal Node");
}
}
else
{
throw new RdfQueryException("Not a valid Replace Expression");
}
}
else
{
throw new RdfQueryException("Not a valid Replace Expression");
}
}
// Execute the Regular Expression
IValuedNode textNode = this._textExpr.Evaluate(context, bindingID);
if (textNode == null)
{
throw new RdfQueryException("Cannot evaluate a Regular Expression against a NULL");
}
if (textNode.NodeType == NodeType.Literal)
{
// Execute
string text = textNode.AsString();
string output = Regex.Replace(text, this._find, this._replace, this._options);
return(new StringNode(null, output, UriFactory.Create(XmlSpecsHelper.XmlSchemaDataTypeString)));
}
else
{
throw new RdfQueryException("Cannot evaluate a Regular Expression against a non-Literal Node");
}
}
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));
}
}
