Examples of org.pdf4j.saxon.instruct.UserFunction

org.pdf4j.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.


    /**
     * Create the instruction
     */
    public BreakInstr() {
        breakFunction = new UserFunction();
        breakFunction.setFunctionName(SAXON_BREAK);
    }

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


    public Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env)
            throws XPathException {
        UserFunction fn = (UserFunction)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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        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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                }
                finallyExp.process(context);
                break;
            }
            action.process(c2);
            UserFunction fn = c2.getTailCallFunction();
            if (fn == null) {
                // no saxon:continue or saxon:break was encountered; just loop around
            } else if (fn.getFunctionName().equals(BreakInstr.SAXON_BREAK)) {
                // indicates a saxon:break instruction was encountered: break the loop
                iter.close();
                return null;
            } else {
                // a saxon:continue instruction was encountered.

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Related Classes of org.pdf4j.saxon.instruct.UserFunction

org.pdf4j.saxon.Controller

org.pdf4j.saxon.expr.BreakInstr

org.pdf4j.saxon.expr.ExpressionTool

org.pdf4j.saxon.expr.IterateInstr

org.pdf4j.saxon.expr.TailCallLoop

org.pdf4j.saxon.functions.ExecutableFunctionLibrary

org.pdf4j.saxon.PreparedStylesheet

org.pdf4j.saxon.query.XQueryFunctionLibrary

java.util.HashMap

java.util.Iterator

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