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 $

     * types are wrapped into objects.
     * @param xpath expression
     * @return Object found
     */
    public Object getValue(String xpath) {
        Expression expression = compileExpression(xpath);
// TODO: (work in progress) - trying to integrate with Xalan
//        Object ctxNode = getNativeContextNode(expression);
//        if (ctxNode != null) {
//            System.err.println("WILL USE XALAN: " + xpath);
//            CachedXPathAPI api = new CachedXPathAPI();

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     * @param xpath expression
     * @param requiredType Class
     * @return Object
     */
    public Object getValue(String xpath, Class requiredType) {
        Expression expr = compileExpression(xpath);
        return getValue(xpath, expr, requiredType);
    }

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            testContextDependency("test:func(3, foo)", true);
        }
    }


    public void testContextDependency(String xpath, boolean expected){
        Expression expr = (Expression)Parser.parseExpression(xpath, new TreeCompiler());
        assertEquals("Evaluating <" + xpath + ">", expected, expr.isContextDependent());
    }

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


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

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    /**
     * 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);
    }

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        // 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)

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    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

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    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

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    {
        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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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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