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 $

            String expectedSignature, String expectedValueSignature)
    {
        Object value = context.getValue(path);
        assertEquals("Checking value: " + path, expectedValue, value);


        Pointer pointer = context.getPointer(path);
        assertEquals("Checking pointer: " + path,
                expectedPath, pointer.toString());


        assertEquals("Checking signature: " + path,
                expectedSignature, pointerSignature(pointer));
        
        Pointer vPointer = ((NodePointer) pointer).getValuePointer();
        assertEquals("Checking value pointer signature: " + path,
                expectedValueSignature, pointerSignature(vPointer));
    }

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    }


    private void assertNullPointer(String path, String expectedPath,
            String expectedSignature)
    {
        Pointer pointer = context.getPointer(path);
        assertNotNull("Null path exists: " + path,
                    pointer);
        assertEquals("Null path as path: " + path,
                    expectedPath, pointer.asPath());
        assertEquals("Checking Signature: " + path,
                    expectedSignature, pointerSignature(pointer));
                
        Pointer vPointer = ((NodePointer) pointer).getValuePointer();
        assertTrue("Null path is null: " + path,
                    !((NodePointer) vPointer).isActual());
        assertEquals("Checking value pointer signature: " + path,
                    expectedSignature + "N", pointerSignature(vPointer));
    }

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        JXPathContext context = JXPathContext.newContext(map);


        Iterator it = context.iteratePointers("foo");
        List actual = new ArrayList();
        while (it.hasNext()) {
            Pointer ptr = (Pointer) it.next();
            actual.add(context.getValue(ptr.asPath()));
        }
        assertEquals(
            "Iterating pointers <" + "foo" + ">",
            list("a", "b", "c"),
            actual);

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        JXPathContext context = JXPathContext.newContext(map);
        context.getVariables().declareVariable("x", new Integer(2));
        Iterator it = context.iteratePointers("foo[$x]");
        List actual = new ArrayList();
        while (it.hasNext()) {
            Pointer ptr = (Pointer) it.next();
            actual.add(context.getValue(ptr.asPath()));
        }
        assertEquals("Iterating pointers <" + "foo" + ">", list("b"), actual);
    }

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    }


    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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        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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        int iterCount = 0;
        Iterator iter = context.iteratePointers("/beans/name");
        while (iter.hasNext()) {
            iterCount++;
            Pointer pointer = (Pointer) iter.next();
            String s = (String) pointer.getValue();
            s = s + "suffix";
            pointer.setValue(s);
            assertEquals("pointer.getValue", s, pointer.getValue());
            // fails right here, the value isn't getting set in the bean.
            assertEquals(
                "context.getValue",
                s,
                context.getValue(pointer.asPath()));
        }
        assertEquals("Iteration count", 2, iterCount);


        assertXPathValue(context, "/beans[1]/name", "Name 1suffix");
        assertXPathValue(context, "/beans[2]/name", "Name 2suffix");

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        else if (object instanceof NodePointer) {
            return stringValue(((NodePointer) object).getValue());
        }
        else if (object instanceof EvalContext) {
            EvalContext ctx = (EvalContext) object;
            Pointer ptr = ctx.getSingleNodePointer();
            if (ptr != null) {
                return stringValue(ptr);
            }
            return "";
        }

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        ArrayList list = new ArrayList();
        while (nextSet()) {
            while (nextNode()) {
                NodePointer pointer = getCurrentNodePointer();
                if (!set.contains(pointer)) {
                    Pointer cln = (Pointer) pointer.clone();
                    set.add(cln);
                    list.add(cln);
                }
            }
        }

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        return new SimpleNodeSet();
    }


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

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