Examples of org.apache.commons.jxpath.Pointer

org.apache.commons.jxpath.Pointer
Pointers represent locations of objects and their properties in Java object graphs. JXPathContext has methods ( {@link JXPathContext#getPointer(java.lang.String) getPointer()}and ( {@link JXPathContext#iteratePointers(java.lang.String) iteratePointers()}, which, given an XPath, produce Pointers for the objects or properties described the the path. For example, ctx.getPointer ("foo/bar") will produce a Pointer that can get and set the property "bar" of the object which is the value of the property "foo" of the root object. The value of ctx.getPointer("aMap/aKey[3]") will be a pointer to the 3'rd element of the array, which is the value for the key "aKey" of the map, which is the value of the property "aMap" of the root object. @author Dmitri Plotnikov @version $Revision: 1.7 $ $Date: 2003/03/11 00:59:12 $

     */
    private boolean isRecursive() {
        Object node = currentNodePointer.getNode();
        for (int i = stack.size() - 1; --i >= 0;) {
            NodeIterator it = (NodeIterator) stack.get(i);
            Pointer pointer = it.getNodePointer();
            if (pointer != null && pointer.getNode() == node) {
                return true;
            }
        }
        return false;
    }

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     * @return resulting Pointer
     */
    public Pointer createPath(String xpath, Expression expr) {
        try {
            Object result = expr.computeValue(getEvalContext());
            Pointer pointer = null;


            if (result instanceof Pointer) {
                pointer = (Pointer) result;
            }
            else if (result instanceof EvalContext) {

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     * @return Pointer created
     */
    private Pointer setValue(String xpath, Expression expr, Object value,
            boolean create) {
        Object result = expr.computeValue(getEvalContext());
        Pointer pointer = null;


        if (result instanceof Pointer) {
            pointer = (Pointer) result;
        }
        else if (result instanceof EvalContext) {
            EvalContext ctx = (EvalContext) result;
            pointer = ctx.getSingleNodePointer();
        }
        else {
            if (create) {
                checkSimplePath(expr);
            }


            // This should never happen
            throw new JXPathException("Cannot set value for xpath: " + xpath);
        }
        if (create) {
            pointer = ((NodePointer) pointer).createPath(this, value);
        }
        else {
            pointer.setValue(value);
        }
        return pointer;
    }

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     * @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;
                }

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        if (object instanceof NodePointer) {
            return stringValue(((NodePointer) object).getValue());
        }
        if (object instanceof EvalContext) {
            EvalContext ctx = (EvalContext) object;
            Pointer ptr = ctx.getSingleNodePointer();
            return ptr == null ? "" : stringValue(ptr);
        }
        return String.valueOf(object);
    }

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                return NOT_A_NUMBER;
            }
        }
        if (object instanceof EvalContext) {
            EvalContext ctx = (EvalContext) object;
            Pointer ptr = ctx.getSingleNodePointer();
            return ptr == null ? NOT_A_NUMBER : number(ptr);
        }
        if (object instanceof NodePointer) {
            return number(((NodePointer) object).getValue());
        }

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        if (object instanceof NodePointer) {
            return doubleValue(((NodePointer) object).getValue());
        }
        if (object instanceof EvalContext) {
            EvalContext ctx = (EvalContext) object;
            Pointer ptr = ctx.getSingleNodePointer();
            return ptr == null ? Double.NaN : doubleValue(ptr);
        }
        return doubleValue(stringValue(object));
    }

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        if (object instanceof Boolean) {
            return ((Boolean) object).booleanValue();
        }
        if (object instanceof EvalContext) {
            EvalContext ctx = (EvalContext) object;
            Pointer ptr = ctx.getSingleNodePointer();
            return ptr == null ? false : booleanValue(ptr);
        }
        if (object instanceof String) {
            return ((String) object).length() != 0;
        }

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    public Object getValue() {
        return getNodeSet();
    }


    public String toString() {
        Pointer ptr = getContextNodePointer();
        return ptr == null ? "Empty expression context" : "Expression context [" + getPosition()
                + "] " + ptr.asPath();
    }

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            this.delegate = delegate;
        }


        public NodeSet getNodeSetByKey(JXPathContext context, String key,
                Object value) {
            Pointer pointer = delegate.getPointerByKey(context, key, InfoSetUtil.stringValue(value));
            BasicNodeSet result = new BasicNodeSet();
            result.add(pointer);
            return result;
        }

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