protected override void VisitSubstringFunction(SubstringFunction function) { this.CommandText.Append("SUBSTR("); this.VisitField(function.Argument); this.CommandText.Append(", "); this.VisitField(function.StartIndex); this.CommandText.Append(" + 1"); if (function.Length != null) { this.CommandText.Append(", "); this.VisitField(function.Length); } this.CommandText.Append(")"); }
protected override void VisitStringCharIndexFunction(StringIndexFunction function) { this.CommandText.Append("("); if (function.StartIndex != null) { // e.g. INSTR(SUBSTR(text, startIndex), stringToFind) + startIndex var substring = new SubstringFunction() { Argument = function.Argument, StartIndex = function.StartIndex }; this.VisitFunction("INSTR", substring, function.StringToFind); this.CommandText.Append(" + "); this.VisitField(function.StartIndex); } else { this.VisitFunction("INSTR", function.Argument, function.StringToFind); } this.CommandText.Append(" - 1)"); }
/// <summary> /// Tries to create an ARQ Function expression if the function Uri correseponds to a supported ARQ Function. /// </summary> /// <param name="u">Function Uri.</param> /// <param name="args">Function Arguments.</param> /// <param name="scalarArgs">Scalar Arguments.</param> /// <param name="expr">Generated Expression.</param> /// <returns>Whether an expression was successfully generated.</returns> public bool TryCreateExpression(Uri u, List <ISparqlExpression> args, Dictionary <String, ISparqlExpression> scalarArgs, out ISparqlExpression expr) { // If any Scalar Arguments are present then can't possibly be an ARQ Function if (scalarArgs.Count > 0) { expr = null; return(false); } String func = u.AbsoluteUri; if (func.StartsWith(ArqFunctionsNamespace)) { func = func.Substring(ArqFunctionsNamespace.Length); ISparqlExpression arqFunc = null; switch (func) { case BNode: if (args.Count == 1) { arqFunc = new BNodeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ bnode() function"); } break; case E: if (args.Count == 0) { arqFunc = new EFunction(); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ e() function"); } break; case LocalName: if (args.Count == 1) { arqFunc = new LocalNameFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ localname() function"); } break; case Max: if (args.Count == 2) { arqFunc = new MaxFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ max() function"); } break; case Min: if (args.Count == 2) { arqFunc = new MinFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ min() function"); } break; case Namespace: if (args.Count == 1) { arqFunc = new NamespaceFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ namespace() function"); } break; case Now: if (args.Count == 0) { arqFunc = new NowFunction(); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ now() function"); } break; case Pi: if (args.Count == 0) { arqFunc = new PiFunction(); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ pi() function"); } break; case Sha1Sum: if (args.Count == 1) { arqFunc = new Sha1Function(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ sha1sum() function"); } break; case StrJoin: if (args.Count >= 2) { arqFunc = new StringJoinFunction(args.First(), args.Skip(1)); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ strjoing() function"); } break; case Substr: case Substring: if (args.Count == 2) { arqFunc = new SubstringFunction(args.First(), args.Last()); } else if (args.Count == 3) { arqFunc = new SubstringFunction(args.First(), args[1], args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the ARQ " + func + "() function"); } break; } if (arqFunc != null) { expr = arqFunc; return(true); } } expr = null; return(false); }
/// <summary> /// Tries to create an XPath Function expression if the function Uri correseponds to a supported XPath Function. /// </summary> /// <param name="u">Function Uri.</param> /// <param name="args">Function Arguments.</param> /// <param name="scalarArgs">Scalar Arguments.</param> /// <param name="expr">Generated Expression.</param> /// <returns>Whether an expression was successfully generated.</returns> public bool TryCreateExpression(Uri u, List <ISparqlExpression> args, Dictionary <String, ISparqlExpression> scalarArgs, out ISparqlExpression expr) { // If any Scalar Arguments are present then can't possibly be an XPath Function if (scalarArgs.Count > 0) { expr = null; return(false); } String func = u.AbsoluteUri; if (func.StartsWith(XPathFunctionsNamespace)) { func = func.Substring(XPathFunctionsNamespace.Length); ISparqlExpression xpathFunc = null; switch (func) { case Absolute: if (args.Count == 1) { xpathFunc = new AbsFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath abs() function"); } break; case AdjustDateTimeToTimezone: throw new NotSupportedException("XPath adjust-dateTime-to-timezone() function is not supported"); case Boolean: if (args.Count == 1) { xpathFunc = new BooleanFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath boolean() function"); } throw new NotSupportedException("XPath boolean() function is not supported"); case Ceiling: if (args.Count == 1) { xpathFunc = new CeilingFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath ceiling() function"); } break; case Compare: if (args.Count == 2) { xpathFunc = new CompareFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath compare() function"); } break; case Concat: if (args.Count == 2) { xpathFunc = new ConcatFunction(args.First(), args.Last()); } else if (args.Count > 2) { xpathFunc = new ConcatFunction(args); } else { throw new RdfParseException("Incorrect number of arguments for the XPath concat() function"); } break; case Contains: if (args.Count == 2) { xpathFunc = new ContainsFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath contains() function"); } break; case DayFromDateTime: if (args.Count == 1) { xpathFunc = new DayFromDateTimeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath day-from-dateTime() function"); } break; case EncodeForURI: if (args.Count == 1) { xpathFunc = new EncodeForUriFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath encode-for-uri() function"); } break; case EndsWith: if (args.Count == 2) { xpathFunc = new EndsWithFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath ends-with() function"); } break; case EscapeHtmlURI: if (args.Count == 1) { xpathFunc = new EscapeHtmlUriFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath escape-html-uri() function"); } break; case False: if (args.Count == 0) { xpathFunc = new ConstantTerm(new BooleanNode(null, false)); } else { throw new RdfParseException("Incorrect number of arguments for the XPath false() function"); } break; case Floor: if (args.Count == 1) { xpathFunc = new FloorFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath floor() function"); } break; case HoursFromDateTime: if (args.Count == 1) { xpathFunc = new HoursFromDateTimeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath hours-from-dateTime() function"); } break; case LowerCase: if (args.Count == 1) { xpathFunc = new LowerCaseFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath lower-case() function"); } break; case Matches: if (args.Count == 2) { xpathFunc = new Functions.Sparql.Boolean.RegexFunction(args.First(), args.Last()); } else if (args.Count == 3) { xpathFunc = new Functions.Sparql.Boolean.RegexFunction(args.First(), args[1], args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath matches() function"); } break; case MinutesFromDateTime: if (args.Count == 1) { xpathFunc = new MinutesFromDateTimeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath minutes-from-dateTime() function"); } break; case MonthFromDateTime: if (args.Count == 1) { xpathFunc = new MonthFromDateTimeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath month-from-dateTime() function"); } break; case NormalizeSpace: if (args.Count == 1) { xpathFunc = new NormalizeSpaceFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath normalize-space() function"); } break; case NormalizeUnicode: if (args.Count == 1) { xpathFunc = new NormalizeUnicodeFunction(args.First()); } else if (args.Count == 2) { xpathFunc = new NormalizeUnicodeFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath normalize-space() function"); } break; case Not: if (args.Count == 1) { xpathFunc = new NotExpression(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath not() function"); } break; case Replace: if (args.Count == 3) { xpathFunc = new ReplaceFunction(args.First(), args[1], args.Last()); } else if (args.Count == 4) { xpathFunc = new ReplaceFunction(args.First(), args[1], args[2], args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath replace() function"); } break; case Round: if (args.Count == 1) { xpathFunc = new RoundFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath round() function"); } break; case RoundHalfToEven: if (args.Count == 1) { xpathFunc = new RoundHalfToEvenFunction(args.First()); } else if (args.Count == 2) { xpathFunc = new RoundHalfToEvenFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath round-half-to-even() function"); } break; case SecondsFromDateTime: if (args.Count == 1) { xpathFunc = new SecondsFromDateTimeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath seconds-from-dateTime() function"); } break; case StartsWith: if (args.Count == 2) { xpathFunc = new StartsWithFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath starts-with() function"); } break; case StringJoin: if (args.Count == 1) { xpathFunc = new AggregateTerm(new StringJoinAggregate(args.First())); } else if (args.Count == 2) { xpathFunc = new AggregateTerm(new StringJoinAggregate(args.First(), args.Last())); } else { throw new RdfParseException("Incorrect number of arguments for the XPath string-join() function"); } break; case StringLength: if (args.Count == 1) { xpathFunc = new StringLengthFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath string-length() function"); } break; case Substring: if (args.Count == 2) { xpathFunc = new SubstringFunction(args.First(), args.Last()); } else if (args.Count == 3) { xpathFunc = new SubstringFunction(args.First(), args[1], args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath substring() function"); } break; case SubstringAfter: if (args.Count == 2) { xpathFunc = new SubstringAfterFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath substring-after() function"); } break; case SubstringBefore: if (args.Count == 2) { xpathFunc = new SubstringBeforeFunction(args.First(), args.Last()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath substring-before() function"); } break; case TimezoneFromDateTime: if (args.Count == 1) { xpathFunc = new TimezoneFromDateTimeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath timezone-from-dateTime() function"); } break; case Translate: throw new NotSupportedException("XPath translate() function is not supported"); case True: if (args.Count == 0) { xpathFunc = new ConstantTerm(new BooleanNode(null, true)); } else { throw new RdfParseException("Incorrect number of arguments for the XPath true() function"); } break; case UpperCase: if (args.Count == 1) { xpathFunc = new UpperCaseFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath upper-case() function"); } break; case YearFromDateTime: if (args.Count == 1) { xpathFunc = new YearFromDateTimeFunction(args.First()); } else { throw new RdfParseException("Incorrect number of arguments for the XPath year-from-dateTime() function"); } break; } if (xpathFunc != null) { expr = xpathFunc; return(true); } } expr = null; return(false); }