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 $

    protected CompiledExpression compilePath(String xpath) {
        return new JXPathCompiledExpression(xpath, compileExpression(xpath));
    }


    private Expression compileExpression(String xpath) {
        Expression expr;
        if (USE_SOFT_CACHE) {
            expr = null;
            SoftReference ref = (SoftReference) compiled.get(xpath);
            if (ref != null) {
                expr = (Expression) ref.get();

View Full Code Here

    /**
     * Calls getValue(xpath), converts the result to the required type
     * and returns the result of the conversion.
     */
    public Object getValue(String xpath, Class requiredType) {
        Expression expr = compileExpression(xpath);
        return getValue(xpath, expr, requiredType);
    }

View Full Code Here


        // Open all containers
        parent = valuePointer(parent);
        
        Step step = steps[currentStep];
        Expression predicates[] = step.getPredicates();


        // Divide and conquer: the process is broken out into
        // four major use cases.
        // 1. Current step has no predicates and
        //    the root is a property owner (e.g. bean or map)

View Full Code Here

    private static NodePointer doStepPredicatesPropertyOwner(
            EvalContext context, PropertyOwnerPointer parentPointer,
            Step[] steps, int currentStep)
    {
        Step step = steps[currentStep];
        Expression predicates[] = step.getPredicates();


        NodePointer childPointer =
            createChildPointerForStep(parentPointer, step);
        if (!childPointer.isActual()) {
            // Property does not exist - return a null pointer

View Full Code Here

    private static NodePointer doStepPredicatesStandard(
            EvalContext context, NodePointer parent,
            Step[] steps, int currentStep)
    {
        Step step = steps[currentStep];
        Expression predicates[] = step.getPredicates();


        int axis = step.getAxis();
        if (axis == Compiler.AXIS_SELF) {
            return doPredicate(
                context,
                parent,
                steps,
                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

View Full Code Here

    {
        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,

View Full Code Here

    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();

View Full Code Here

        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);

View Full Code Here

    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.setIndex(index);
            return doPredicate(

View Full Code Here

     * [@name=expression].
     */
    private static String keyFromPredicate(EvalContext context,
                Expression predicate) 
    {
        Expression expr =
            ((NameAttributeTest) predicate).getNameTestExpression();
        return InfoSetUtil.stringValue(expr.computeValue(context));
    }

View Full Code Here

0 1 2 3

TOP

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

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.