Examples of net.sf.saxon.instruct.UserFunction

net.sf.saxon.instruct.UserFunction
This object represents the compiled form of a user-written function (the source can be either an XSLT stylesheet function or an XQuery function).
It is assumed that type-checking, of both the arguments and the results, has been handled at compile time. That is, the expression supplied as the body of the function must be wrapped in code to check or convert the result to the required type, and calls on the function must be wrapped at compile time to check or convert the supplied arguments.


    public SequenceType[] getFunctionSignature(StructuredQName functionName, int arity) {
        XSLFunction fn = stylesheet.getStylesheetFunction(functionName, arity);
        if (fn != null) {
            SequenceType[] sig = new SequenceType[arity+1];
            UserFunction uf = fn.getCompiledFunction();
            if (uf == null) {
                // XSLT: function not yet compiled
                Arrays.fill(sig, SequenceType.ANY_SEQUENCE);
            } else {
                UserFunctionParameter[] params = uf.getParameterDefinitions();
                sig[0] = uf.getResultType(stylesheet.getConfiguration().getTypeHierarchy());
                for (int i=0; i<params.length; i++) {
                    sig[i+1] = params[i].getRequiredType();
                }
            }
            return sig;

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                    return sig;
                }
            }
            return null;
        }
        UserFunction uf = functions.get(makeKey(functionName, arity));
        if (uf != null) {
            SequenceType[] sig = new SequenceType[arity+1];
            UserFunctionParameter[] params = uf.getParameterDefinitions();
            sig[0] = uf.getResultType(config.getTypeHierarchy());
            for (int i=0; i<params.length; i++) {
                sig[i+1] = params[i].getRequiredType();
            }
            return sig;
        } else {

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     * the function call, but no function was found.
     */


    public Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env)
            throws XPathException {
        UserFunction fn = functions.get(makeKey(functionName, staticArgs.length));
        if (fn == null) {
            return null;
        }
        ExpressionVisitor visitor = ExpressionVisitor.make(env);
        UserFunctionCall fc = new UserFunctionCall();
        fc.setFunctionName(functionName);
        fc.setArguments(staticArgs);
        fc.setFunction(fn);
        fc.checkFunctionCall(fn, visitor);
        fc.setStaticType(fn.getResultType(config.getTypeHierarchy()));
        return fc;
    }

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    public SequenceIterator iterate(XPathContext context) throws XPathException {
        final XPathContextMajor cm = (XPathContextMajor)context;
        while (true) {
            SequenceIterator iter = operand.iterate(cm);
            ValueRepresentation extent = SequenceExtent.makeSequenceExtent(iter);
            UserFunction fn = cm.getTailCallFunction();
            if (fn == null) {
                return Value.asIterator(extent);
            }
            if (fn != containingFunction) {
                return Value.asIterator(tailCallDifferentFunction(fn, cm));

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    public Item evaluateItem(XPathContext context) throws XPathException {
        final XPathContextMajor cm = (XPathContextMajor)context;
        while (true) {
            Item item = operand.evaluateItem(context);
            UserFunction fn = cm.getTailCallFunction();
            if (fn == null) {
               return item;
            }
            if (fn != containingFunction) {
                return Value.asItem(tailCallDifferentFunction(fn, cm));

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    public void process(XPathContext context) throws XPathException {
        final XPathContextMajor cm = (XPathContextMajor)context;
        while (true) {
            operand.process(context);
            UserFunction fn = cm.getTailCallFunction();
            if (fn == null) {
                return;
            }
            if (fn != containingFunction) {
                Value.asValue(tailCallDifferentFunction(fn, cm)).process(cm);

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        if (fd != null) {
            UserFunctionCall ufc = new UserFunctionCall();
            ufc.setFunctionName(fd.getFunctionName());
            ufc.setArguments(arguments);
            ufc.setStaticType(fd.getResultType());
            UserFunction fn = fd.getUserFunction();
            if (fn == null) {
                // not yet compiled
                fd.registerReference(ufc);
                ufc.setConfirmed(true);
            } else {

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     * be objects of class {@link UserFunction}
     */


    public static void gatherCalledFunctions(Expression e, List list) {
        if (e instanceof UserFunctionCall) {
            UserFunction function = ((UserFunctionCall)e).getFunction();
            if (!list.contains(function)) {
                list.add(function);
            }
        } else {
            for (Iterator children = e.iterateSubExpressions(); children.hasNext();) {

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                "declare function f:t1($v1 as xs:integer, $v2 as xs:untypedAtomic*) { " +
                "   $v1 div $v2" +
                "};" +
                "10");


        final UserFunction fn1 = exp1.getStaticContext().getUserDefinedFunction("f.ns", "t1", 2);
        if (fn1 == null) {
            throw new IllegalStateException("Function f:t1() not found");
        }
        final Controller controller = exp1.newController();
        final Value[] arglist = new Value[2];
        arglist[0] = new Int64Value(10);
        for (int i = 3; i < 10; i++) {
            arglist[1] = new Int64Value(i);
            final ValueRepresentation result = fn1.call(arglist, controller);
            System.out.println(arglist[0] + " div " + arglist[1] + " = " + result);
        }
    }

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        presenter.startElement("functions");
        for (int i=0; i<libraryList.size(); i++) {
            FunctionLibrary lib = (FunctionLibrary)libraryList.get(i);
            if (lib instanceof ExecutableFunctionLibrary) {
                for (Iterator f = ((ExecutableFunctionLibrary)lib).iterateFunctions(); f.hasNext();) {
                    UserFunction func = (UserFunction)f.next();
                    presenter.startElement("function");
                    presenter.emitAttribute("name", func.getFunctionName().getDisplayName());
                    presenter.emitAttribute("line", func.getLineNumber()+"");
                    presenter.emitAttribute("module", func.getSystemId());
                    func.getBody().explain(presenter);
                    presenter.endElement();
                }
            }
        }
        presenter.endElement();

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Related Classes of net.sf.saxon.instruct.UserFunction

net.sf.saxon.Controller

net.sf.saxon.expr.ExpressionTool

net.sf.saxon.expr.TailCallLoop

net.sf.saxon.functions.ExecutableFunctionLibrary

net.sf.saxon.om.Item

net.sf.saxon.om.NodeInfo

net.sf.saxon.om.SequenceIterator

net.sf.saxon.om.ValueRepresentation

net.sf.saxon.PreparedStylesheet

net.sf.saxon.query.XQueryFunctionLibrary

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