/// <summary> /// Evaluate the expression, returning the result as an <c>XdmValue</c> (that is, /// a sequence of nodes and/or atomic values). /// </summary> /// <remarks> /// Although a singleton result <i>may</i> be represented as an <c>XdmItem</c>, there is /// no guarantee that this will always be the case. If you know that the expression will return at /// most one node or atomic value, it is best to use the <c>EvaluateSingle</c> method, which /// does guarantee that an <c>XdmItem</c> (or null) will be returned. /// </remarks> /// <returns> /// An <c>XdmValue</c> representing the results of the expression. /// </returns> /// <exception cref="DynamicError"> /// Throws <c>Saxon.Api.DynamicError</c> if the evaluation of the XPath expression fails /// with a dynamic error. /// </exception> public XdmValue Evaluate() { try { JSequence value = (JSequence)JSequenceExtent.makeSequenceExtent( exp.iterate(dynamicContext)); return(XdmValue.Wrap(value)); } catch (net.sf.saxon.trans.XPathException err) { throw new DynamicError(err); } }
/// <summary> /// Call a global user-defined function in the compiled query. /// </summary> /// <remarks> /// If this is called more than once (to evaluate the same function repeatedly with different arguments, /// or to evaluate different functions) then the sequence of evaluations uses the same values of global /// variables including external variables (query parameters); the effect of any changes made to query parameters /// between calls is undefined. /// </remarks> /// <param name="function"> /// The name of the function to be called /// </param> /// <param name="arguments"> /// The values of the arguments to be supplied to the function. These /// must be of the correct type as defined in the function signature (there is no automatic /// conversion to the required type). /// </param> /// <exception cref="ArgumentException">If no function has been defined with the given name and arity /// or if any of the arguments does not match its required type according to the function /// signature.</exception> /// <exception cref="DynamicError">If a dynamic error occurs in evaluating the function. /// </exception> public XdmValue CallFunction(QName function, XdmValue[] arguments) { try { JXdmValue[] vr = new JXdmValue[arguments.Length]; for (int i = 0; i < arguments.Length; i++) { vr[i] = XdmValue.FromGroundedValueToJXdmValue(arguments[i].value); } JSequence result = evaluator.callFunction(function.UnderlyingQName(), vr).getUnderlyingValue(); return(XdmValue.Wrap(result)); } catch (JSaxonApiException e) { throw new DynamicError(e); } }
///<summary> /// Call a global user-defined function in the compiled query. ///</summary> ///<remarks> /// If this is called more than once (to evaluate the same function repeatedly with different arguments, /// or to evaluate different functions) then the sequence of evaluations uses the same values of global /// variables including external variables (query parameters); the effect of any changes made to query parameters /// between calls is undefined. /// </remarks> /// <param name="function"> /// The name of the function to be called /// </param> /// <param name="arguments"> /// The values of the arguments to be supplied to the function. These /// must be of the correct type as defined in the function signature (there is no automatic /// conversion to the required type). /// </param> /// <exception cref="ArgumentException">If no function has been defined with the given name and arity /// or if any of the arguments does not match its required type according to the function /// signature.</exception> /// <exception cref="DynamicError">If a dynamic error occurs in evaluating the function. /// </exception> public XdmValue CallFunction(QName function, XdmValue[] arguments) { JUserFunction fn = exp.getMainModule().getUserDefinedFunction( function.Uri, function.LocalName, arguments.Length); if (fn == null) { throw new ArgumentException("No function with name " + function.ClarkName + " and arity " + arguments.Length + " has been declared in the query"); } try { // TODO: use the same controller in other interfaces such as run(), and expose it in a trapdoor API if (controller == null) { controller = exp.newController(context); context.initializeController(controller); controller.initializeController(context.getParameters()); } JSequence[] vr = new JSequence[arguments.Length]; for (int i = 0; i < arguments.Length; i++) { JSequenceType type = fn.getParameterDefinitions()[i].getRequiredType(); vr[i] = arguments[i].Unwrap(); if (!type.matches(vr[i], controller.getConfiguration().getTypeHierarchy())) { throw new ArgumentException("Argument " + (i + 1) + " of function " + function.ClarkName + " does not match the required type " + type.toString()); } } JSequence result = fn.call(vr, controller); return(XdmValue.Wrap(result)); } catch (JXPathException e) { throw new DynamicError(e); } }