Examples of org.pdf4j.saxon.expr.ExpressionVisitor

org.pdf4j.saxon.expr.ExpressionVisitor
The ExpressionVisitor supports the various phases of processing of an expression tree which require a recursive walk of the tree structure visiting each node in turn. In maintains a stack holding the ancestor nodes of the node currently being visited.

        return createExpressionInternal(expression);
    }


    private XPathExpressionImpl createExpressionInternal(String expression) throws org.pdf4j.saxon.trans.XPathException {
        Expression exp = ExpressionTool.make(expression, staticContext, 0, -1, 1, false);
        ExpressionVisitor visitor = ExpressionVisitor.make(staticContext);
        visitor.setExecutable(getExecutable());
        exp = visitor.typeCheck(exp, Type.ITEM_TYPE);
        SlotManager map = staticContext.getConfiguration().makeSlotManager();
        ExpressionTool.allocateSlots(exp, 0, map);
        exp.setContainer(staticContext);
        XPathExpressionImpl xpe = new XPathExpressionImpl(exp, getExecutable());
        xpe.setStackFrameMap(map);

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     * @deprecated since Saxon 8.9 - use the various method defined in the JAXP interface definition
    */


    public List evaluate(String expression) throws org.pdf4j.saxon.trans.XPathException {
        Expression exp = ExpressionTool.make(expression, staticContext,0,-1,1, false);
        ExpressionVisitor visitor = ExpressionVisitor.make(staticContext);
        visitor.setExecutable(getExecutable());
        exp = visitor.typeCheck(exp, Type.ITEM_TYPE);
        SlotManager map = staticContext.getConfiguration().makeSlotManager();
        ExpressionTool.allocateSlots(exp, 0, map);
        XPathContextMajor context = new XPathContextMajor(contextNode, staticContext.getExecutable());
        context.openStackFrame(map);
        SequenceIterator iterator = exp.iterate(context);

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     * @deprecated since Saxon 8.9 - use the methods defined in the JAXP interface
    */


    public Object evaluateSingle(String expression) throws org.pdf4j.saxon.trans.XPathException {
        Expression exp = ExpressionTool.make(expression, staticContext,0,-1,1, false);
        ExpressionVisitor visitor = ExpressionVisitor.make(staticContext);
        visitor.setExecutable(getExecutable());
        exp = visitor.typeCheck(exp, Type.ITEM_TYPE);
        SlotManager map = staticContext.getConfiguration().makeSlotManager();
        ExpressionTool.allocateSlots(exp, 0, map);
        XPathContextMajor context = new XPathContextMajor(contextNode, staticContext.getExecutable());
        context.openStackFrame(map);
        SequenceIterator iterator = exp.iterate(context);

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                body = Literal.makeEmptySequence();
            }


            try {


                ExpressionVisitor visitor = makeExpressionVisitor();
                body = visitor.simplify(body);
                if (getConfiguration().isCompileWithTracing()) {
                    TraceWrapper trace = new TraceInstruction(body, this);
                    trace.setLocationId(allocateLocationId(getSystemId(), getLineNumber()));
                    trace.setContainer(procedure);
                    body = trace;

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            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);

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    */


    public XPathExpression createExpression(String expression) throws XPathException {
        Expression exp = ExpressionTool.make(expression, staticContext, 0, -1, 1, false);
        exp.setContainer(staticContext);
        ExpressionVisitor visitor = ExpressionVisitor.make(staticContext);
        visitor.setExecutable(getExecutable());
        exp = visitor.typeCheck(exp, Type.ITEM_TYPE);
        exp = visitor.optimize(exp, Type.ITEM_TYPE);
        SlotManager map = staticContext.getStackFrameMap();
        int numberOfExternalVariables = map.getNumberOfVariables();
        ExpressionTool.allocateSlots(exp, numberOfExternalVariables, map);
        XPathExpression xpe = new XPathExpression(this, exp);
        xpe.setStackFrameMap(map, numberOfExternalVariables);

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     * @since 9.1
     */


    public XPathExpression createPattern(String pattern) throws XPathException {
        Pattern pat = Pattern.make(pattern, staticContext, staticContext.getExecutable());
        ExpressionVisitor visitor = ExpressionVisitor.make(staticContext);
        pat.analyze(visitor, Type.NODE_TYPE);
        SlotManager map = staticContext.getStackFrameMap();
        int slots = map.getNumberOfVariables();
        slots = pat.allocateSlots(staticContext, map, slots);
        PatternSponsor sponsor = new PatternSponsor(pat);

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                // not yet compiled
                fd.registerReference(ufc);
                ufc.setConfirmed(true);
            } else {
                ufc.setFunction(fn);
                ExpressionVisitor visitor = ExpressionVisitor.make(fd.getStaticContext());
                visitor.setExecutable(fd.getExecutable());
                ufc.checkFunctionCall(fn, visitor);
            }
            return ufc;
        } else {
            return null;

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     * This method is for internal use.
     * @param env the static context for the main query body.
     */


    protected void fixupGlobalFunctions(QueryModule env) throws XPathException {
        ExpressionVisitor visitor = ExpressionVisitor.make(env);
        Iterator iter = functions.values().iterator();
        while (iter.hasNext()) {
            XQueryFunction fn = (XQueryFunction)iter.next();
            fn.compile();
        }
        iter = functions.values().iterator();
        while (iter.hasNext()) {
            XQueryFunction fn = (XQueryFunction)iter.next();
            visitor.setExecutable(fn.getExecutable());
            fn.checkReferences(visitor);
        }
    }

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Related Classes of org.pdf4j.saxon.expr.ExpressionVisitor

org.pdf4j.saxon.functions.ExecutableFunctionLibrary

org.pdf4j.saxon.query.XQueryFunctionLibrary

org.pdf4j.saxon.style.XSLAttributeSet

org.pdf4j.saxon.sxpath.XPathEvaluator

org.pdf4j.saxon.xpath.XPathEvaluator

java.util.Stack

java.util.Iterator

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