Examples of org.apache.commons.jxpath.ri.EvalContext$SimpleNodeSet

org.apache.commons.jxpath.ri.EvalContext
An XPath evaluation context. When evaluating a path, a chain of EvalContexts is created, each context in the chain representing a step of the path. Subclasses of EvalContext implement behavior of various XPath axes: "child::", "parent::" etc. @author Dmitri Plotnikov @version $Revision: 1.23 $ $Date: 2003/03/11 00:59:18 $

     * @param firstMatch whether to return the first match found
     * @return Object found
     */
    protected Object expressionPath(EvalContext evalContext, boolean firstMatch) {
        Object value = expression.compute(evalContext);
        EvalContext context;
        if (value instanceof InitialContext) {
            // This is an optimization. We can avoid iterating through a
            // collection if the context bean is in fact one.
            context = (InitialContext) value;
        }
        else if (value instanceof EvalContext) {
            // UnionContext will collect all values from the "value" context
            // and treat the whole thing as a big collection.
            context =
                new UnionContext(
                    evalContext,
                    new EvalContext[] {(EvalContext) value });
        }
        else {
            context = evalContext.getRootContext().getConstantContext(value);
        }


        if (firstMatch
            && isSimpleExpressionPath()
            && !(context instanceof NodeSetContext)) {
            EvalContext ctx = context;
            NodePointer ptr = (NodePointer) ctx.getSingleNodePointer();
            if (ptr != null
                && (ptr.getIndex() == NodePointer.WHOLE_COLLECTION
                    || predicates == null
                    || predicates.length == 0)) {
                return SimplePathInterpreter.interpretSimpleExpressionPath(

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        if (!prepared) {
            prepared = true;
            BasicNodeSet nodeSet = (BasicNodeSet) getNodeSet();
            ArrayList pointers = new ArrayList();
            for (int i = 0; i < contexts.length; i++) {
                EvalContext ctx = (EvalContext) contexts[i];
                while (ctx.nextSet()) {
                    while (ctx.nextNode()) {
                        NodePointer ptr = ctx.getCurrentNodePointer();
                        if (!pointers.contains(ptr)) {
                            pointers.add(ptr);
                        }
                    }
                }

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        return buffer.toString();
    }


    public Object compute(EvalContext context) {
        // Create a chain of contexts
        EvalContext rootContext;
        if (isAbsolute()) {
            rootContext = context.getRootContext().getAbsoluteRootContext();
        }
        else {
            rootContext = new InitialContext(context);

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        return evalSteps(rootContext);
    }


    public Object computeValue(EvalContext context) {
        // Create a chain of contexts
        EvalContext rootContext;
        if (isAbsolute()) {
            rootContext = context.getRootContext().getAbsoluteRootContext();
        }
        else {
            rootContext = new InitialContext(context);

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     * </p>
     * @param context evaluation context
     * @return Pointer
     */
    protected Pointer searchForPath(EvalContext context) {
        EvalContext ctx = buildContextChain(context, steps.length, true);
        Pointer pointer = ctx.getSingleNodePointer();


        if (pointer != null) {
            return pointer;
        }


        for (int i = steps.length; --i > 0;) {
            if (!isSimpleStep(steps[i])) {
                return null;
            }
            ctx = buildContextChain(context, i, true);
            if (ctx.hasNext()) {
                Pointer partial = (Pointer) ctx.next();
                if (ctx.hasNext()) {
                    // If we find another location - the search is
                    // ambiguous, so we report failure
                    return null;
                }
                if (partial instanceof NodePointer) {

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        Object value = arg1.compute(context);
        if (value instanceof NodePointer) {
            value = ((NodePointer) value).getValue();
        }
        if (value instanceof EvalContext) {
            EvalContext ctx = (EvalContext) value;
            while (ctx.hasNext()) {
                ctx.next();
                count++;
            }
        }
        else if (value instanceof Collection) {
            count = ((Collection) value).size();

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     */
    protected Object functionKey(EvalContext context) {
        assertArgCount(2);
        String key = InfoSetUtil.stringValue(getArg1().computeValue(context));
        Object value = getArg2().compute(context);
        EvalContext ec = null;
        if (value instanceof EvalContext) {
            ec = (EvalContext) value;
            if (ec.hasNext()) {
                value = ((NodePointer) ec.next()).getValue();
            }
            else { // empty context -> empty results
                return new NodeSetContext(context, new BasicNodeSet());
            }
        }
        JXPathContext jxpathContext = context.getJXPathContext();
        NodeSet nodeSet = jxpathContext.getNodeSetByKey(key, value);
        if (ec != null && ec.hasNext()) {
            BasicNodeSet accum = new BasicNodeSet();
            accum.add(nodeSet);
            while (ec.hasNext()) {
                value = ((NodePointer) ec.next()).getValue();
                accum.add(jxpathContext.getNodeSetByKey(key, value));
            }
            nodeSet = accum;
        }
        return new NodeSetContext(context, nodeSet);

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            return str == null ? "" : str;
        }
        assertArgCount(1);
        Object set = getArg1().compute(context);
        if (set instanceof EvalContext) {
            EvalContext ctx = (EvalContext) set;
            if (ctx.hasNext()) {
                NodePointer ptr = (NodePointer) ctx.next();
                String str = ptr.getNamespaceURI();
                return str == null ? "" : str;
            }
        }
        return "";

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            return ptr.getName().getName();
        }
        assertArgCount(1);
        Object set = getArg1().compute(context);
        if (set instanceof EvalContext) {
            EvalContext ctx = (EvalContext) set;
            if (ctx.hasNext()) {
                NodePointer ptr = (NodePointer) ctx.next();
                return ptr.getName().getName();
            }
        }
        return "";
    }

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            return ptr.getName().toString();
        }
        assertArgCount(1);
        Object set = getArg1().compute(context);
        if (set instanceof EvalContext) {
            EvalContext ctx = (EvalContext) set;
            if (ctx.hasNext()) {
                NodePointer ptr = (NodePointer) ctx.next();
                return ptr.getName().toString();
            }
        }
        return "";
    }

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org.apache.commons.jxpath.BasicNodeSet

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org.apache.commons.jxpath.ri.axes.UnionContext

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org.apache.commons.jxpath.ri.compiler.CoreOperation

org.apache.commons.jxpath.ri.compiler.CoreOperationUnion

org.apache.commons.jxpath.ri.compiler.ExpressionPath

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