Examples of net.sf.saxon.instruct.SlotManager

net.sf.saxon.instruct.SlotManager
A SlotManager supports functions, templates, etc: specifically, any executable code that requires a stack frame containing local variables. In XSLT a SlotManager underpins any top-level element that can contain local variable declarations, specifically, a top-level xsl:template, xsl:variable, xsl:param, or xsl:function element or an xsl:attribute-set element or xsl:key element. In XQuery it underpins functions and global variables. The purpose of the SlotManager is to allocate slot numbers to variables in the stack, and to record how many slots are needed. A Debugger may define a subclass with additional functionality.

     * created object that the caller is free to modify by adding additional variables, without affecting
     * the static context itself.
     */


    public SlotManager getStackFrameMap() {
        SlotManager map = getConfiguration().makeSlotManager();
        for (Iterator v = variables.values().iterator(); v.hasNext();) {
            XPathVariable var = (XPathVariable)v.next();
            map.allocateSlotNumber(var.getVariableQName());
        }
        return map;
    }

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        if ((expression.getDependencies() & StaticProperty.DEPENDS_ON_LOCAL_VARIABLES) != 0) {
            StackFrame localStackFrame = context.getStackFrame();
            ValueRepresentation[] local = localStackFrame.getStackFrameValues();
            int[] slotsUsed = expression.getSlotsUsed();  // computed on first call
            if (local != null) {
                final SlotManager stackFrameMap = localStackFrame.getStackFrameMap();
                final ValueRepresentation[] savedStackFrame =
                        new ValueRepresentation[stackFrameMap.getNumberOfVariables()];
                for (int s=0; s<slotsUsed.length; s++) {
                    int i = slotsUsed[s];
                    if (local[i] instanceof Closure) {
                        int cdepth = ((Closure)local[i]).depth;
                        if (cdepth >= 10) {

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     * @return the next slot that is free to be allocated
     */


    public int allocateSlots(ExpressionContext env, int nextFree) {
        // See tests cnfr23, idky239, match54, group018
        SlotManager slotManager = env.getStyleElement().getContainingSlotManager();
        if (variableBinding != null) {
            nextFree = ExpressionTool.allocateSlots(variableBinding, nextFree, slotManager);
        }
        for (int i = 0; i < numberOfFilters; i++) {
            nextFree = ExpressionTool.allocateSlots(filters[i], nextFree, slotManager);

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                    var.getRequiredType(), role, visitor.getStaticContext());
            value2 = value2.optimize(visitor, AnyItemType.getInstance());
            var.setSelectExpression(value2);
            value2.setContainer(var);
            // the value expression may declare local variables
            SlotManager map = visitor.getConfiguration().makeSlotManager();
            int slots = ExpressionTool.allocateSlots(value2, 0, map);
            if (slots > 0) {
                var.setContainsLocals(map);
            }

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    private XPathExpressionImpl createExpressionInternal(String expression) throws net.sf.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);
        if (contextNode != null) {

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    public List evaluate(String expression) throws net.sf.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);
        ArrayList list = new ArrayList(20);

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    public Object evaluateSingle(String expression) throws net.sf.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);
        Item item = iterator.next();

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

net.sf.saxon.Configuration

net.sf.saxon.pattern.LocationPathPattern

net.sf.saxon.query.GlobalVariableDefinition

net.sf.saxon.style.UseWhenFilter

net.sf.saxon.style.XSLVariableDeclaration

net.sf.saxon.sxpath.IndependentContext

net.sf.saxon.sxpath.XPathEvaluator

net.sf.saxon.trans.KeyManager

net.sf.saxon.value.Closure

net.sf.saxon.xpath.XPathEvaluator

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