Examples of org.apache.commons.jxpath.ri.compiler.Expression

Package org.apache.commons.jxpath.ri.compiler

Examples of org.apache.commons.jxpath.ri.compiler.Expression

org.apache.commons.jxpath.ri.compiler.Expression
Common superclass for several types of nodes in the parse tree. Provides APIs for optimization of evaluation of expressions. Specifically, an expression only needs to executed once during the evaluation of an xpath if that expression is context-independent. Expression.isContextDependent() provides that hint. @author Dmitri Plotnikov @version $Revision: 1.6 $ $Date: 2003/03/11 00:59:22 $

            pointer.setAttribute(axis == Compiler.AXIS_ATTRIBUTE);
            parent = pointer;
        }
        // else { it is self::node() }


        Expression predicates[] = step.getPredicates();
        return createNullPointerForPredicates(
            context,
            parent,
            steps,
            currentStep,

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            EvalContext context, NodePointer parent,
            Step[] steps, int currentStep,
            Expression predicates[], int currentPredicate)
    {
        for (int i = currentPredicate; i < predicates.length; i++) {
            Expression predicate = predicates[i];
            if (predicate instanceof NameAttributeTest) {
                String key = keyFromPredicate(context, predicate);
                parent = valuePointer(parent);
                NullPropertyPointer pointer = new NullPropertyPointer(parent);
                pointer.setNameAttributeValue(key);

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                currentStep,
                predicates,
                0);
        }


        Expression predicate = predicates[0];


        // Optimize for a single predicate to avoid building a list
        // and to allow the direct access to the index'th element
        // in the case of a simple subscript predecate
        // It is a very common use case, so it deserves individual

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                Expression[] predicates, int currentPredicate) {
        if (currentPredicate == predicates.length) {
            return doStep(context, parent, steps, currentStep + 1);
        }


        Expression predicate = predicates[currentPredicate];
        if (predicate instanceof NameAttributeTest) { // [@name = key1]
            return doPredicateName(
                context,
                parent,
                steps,

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     */
    private static NodePointer doPredicateName(
            EvalContext context, NodePointer parent,
            Step[] steps, int currentStep,
            Expression[] predicates, int currentPredicate) {
        Expression predicate = predicates[currentPredicate];
        String key = keyFromPredicate(context, predicate);
        NodePointer child = valuePointer(parent);
        if (child instanceof PropertyOwnerPointer) {
            PropertyPointer pointer =
                ((PropertyOwnerPointer) child).getPropertyPointer();

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        if (currentPredicate == predicates.length) {
            NodePointer pointer = (NodePointer) parents.get(0);
            return doStep(context, pointer, steps, currentStep + 1);
        }


        Expression predicate = predicates[currentPredicate];
        if (predicate instanceof NameAttributeTest) {
            String key = keyFromPredicate(context, predicate);
            List newList = new ArrayList();
            for (int i = 0; i < parents.size(); i++) {
                NodePointer pointer = (NodePointer) parents.get(i);

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     */
    private static NodePointer doPredicateIndex(
            EvalContext context, NodePointer parent,
            Step[] steps, int currentStep,
            Expression[] predicates, int currentPredicate) {
        Expression predicate = predicates[currentPredicate];
        int index = indexFromPredicate(context, predicate);
        NodePointer pointer = parent;
        if (isCollectionElement(pointer, index)) {
            pointer = (NodePointer) pointer.clone();
            pointer.setIndex(index);

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     * @param predicate predicate to evaluate
     * @return String key extracted
     */
    private static String keyFromPredicate(EvalContext context,
                Expression predicate) {
        Expression expr =
            ((NameAttributeTest) predicate).getNameTestExpression();
        return InfoSetUtil.stringValue(expr.computeValue(context));
    }

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    private static NodePointer createNullPointerForPredicates(
            EvalContext context, NodePointer parent,
            Step[] steps, int currentStep,
            Expression[] predicates, int currentPredicate) {
        for (int i = currentPredicate; i < predicates.length; i++) {
            Expression predicate = predicates[i];
            if (predicate instanceof NameAttributeTest) {
                String key = keyFromPredicate(context, predicate);
                parent = valuePointer(parent);
                NullPropertyPointer pointer = new NullPropertyPointer(parent);
                pointer.setNameAttributeValue(key);

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     * Compile the given expression.
     * @param xpath to compile
     * @return Expression
     */
    private Expression compileExpression(String xpath) {
        Expression expr;


        synchronized (compiled) {
            if (USE_SOFT_CACHE) {
                expr = null;
                SoftReference ref = (SoftReference) compiled.get(xpath);

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Related Classes of org.apache.commons.jxpath.ri.compiler.Expression

org.apache.commons.jxpath.JXPathTestCase

org.apache.commons.jxpath.ri.axes.SimplePathInterpreter

org.apache.commons.jxpath.ri.JXPathContextReferenceImpl

org.apache.commons.jxpath.ri.QName

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