Examples of com.volantis.xml.namespace.NamespacePrefixTracker

com.volantis.xml.namespace.NamespacePrefixTracker
This provides support for tracking changes to mapping from prefixes to namespace URIs and vice versa.
Warning: This is a facade provided for use by user code, not for implementation by user code. User implementations of this interface are highly likely to be incompatible with future releases of the product at both binary and source levels.

This class is intended to be used within a SAX {@link org.xml.sax.ContentHandler} and relies on the order that theprefix mapping and element events are received in SAX. i.e. startPrefixMapping events are received before the associated startElement event and the endPrefixMapping events are received after the associated endElement event.

Most elements will not have any prefix mappings at all so implementations of this should be able to handle that efficiently both in terms of time and performance.

The methods are intended to be used as follows.

startElement

This should be called by the SAX ContentHandler startElement method.

endElement

This should be called by the SAX ContentHandler endElement method.

startPrefixMapping

This should be called by the SAX ContentHandler startPrefixMapping method.

endPrefixMapping

This should be called by the SAX ContentHandler endPrefixMapping method.

If a {@link QName} has an empty prefix then the mapping of the prefix tonamespace URI is dependent on what the {@link QName} is used for. If it isan element then it maps to the default namespace, if it is an attribute then it defaults to the empty namespace and if it is something else such as an XPath function name then it maps to the default function namespace.

Caveat

SAX specifically states that startPrefixMapping and endPrefixMapping events cannot be relied upon to be properly nested with respect to each other. The only thing that can be relied upon is that all the startPrefixMapping events are received before the corresponding startElement event and the endPrefixMapping events are received after the corresponding endElement event.

The events are only properly nested with respect to each other if the endPrefixMapping events are received in the reverse order to the order that the startPrefixMapping} events were received in.
```
 <E xmlns:A="ALPHA" xmlns:B="BETA" xmlns:C="GAMMA"> ... </E> 
```
Given the previous markup the first list shows one possible sequence of properly nested events and the second list shows one possible sequence of badly nested events.
1. startPrefixMapping(A, ALPHA)
2. startPrefixMapping(B, BETA)
3. startPrefixMapping(C, GAMMA)
4. startElement(E)
5. ...
6. endElement(E)
7. endPrefixMapping(C)
8. endPrefixMapping(B)
9. endPrefixMapping(A)
1. startPrefixMapping(A, ALPHA)
2. startPrefixMapping(B, BETA)
3. startPrefixMapping(C, GAMMA)
4. startElement(E)
5. ...
6. endElement(E)
7. endPrefixMapping(A)
8. endPrefixMapping(B)
9. endPrefixMapping(C)
If the events are not received in properly nested order then the mappings held by this object may be incorrect during the processing of endPrefixMapping events. The mappings will be correct once all the endPrefixMapping events for an element have been received.
@volantis-api-include-in PublicAPI @volantis-api-include-in ProfessionalServicesAPI @volantis-api-include-in InternalAPI

        // retrieve the PipelineContext
        XMLPipelineContext context =
                dynamicProcess.getPipeline().getPipelineContext();
        // get hold of the NamespacePrefixTracker so that we can
        // access the registered prefixes
        NamespacePrefixTracker prefixTracker =
                context.getNamespacePrefixTracker();
        // obtain the prefix for the specified namespace URI
        String prefix = prefixTracker.getNamespacePrefix(
                expandedName.getNamespaceURI());
        // local name
        String qName = expandedName.getLocalName();
        if (prefix != null) {
            StringBuffer sb = new StringBuffer(

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     * @return the expression context
     */
    private ExpressionContext createExpressionContext() {
        EnvironmentInteractionTracker eit =
                new SimpleEnvironmentInteractionTracker();
        NamespacePrefixTracker npt = new DefaultNamespacePrefixTracker();
        ExpressionContext context = ExpressionFactory.getDefaultInstance().
                createExpressionContext(eit, npt);
        return context;
    }

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        XMLPipelineContext context
                = process.getPipeline().getPipelineContext();
        
        // ensure that the pipeline contexts NamespacePrefixTracker has
        // been updated        
        NamespacePrefixTracker tracker = context.getNamespacePrefixTracker();


        assertEquals("NamespacePrefixTracker was not updated with the " +
                     "startPrefixMapping event",
                     namespace,
                     tracker.getNamespaceURI(prefix));       
                
        // ensure the event was forwarded to the next process
        next.assertStartPrefixMappingInvoked(prefix, namespace);
    }

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        XMLPipelineContext context
                = process.getPipeline().getPipelineContext();
        
        // Update pipeline contexts NamespacePrefixTracker with a prefix
        // and namespace pair
        NamespacePrefixTracker tracker = context.getNamespacePrefixTracker();
        tracker.startPrefixMapping(prefix, namespace);


        assertEquals("NamespacePrefixTracker was not updated with the " +
                     "startPrefixMapping event",
                     namespace,
                     tracker.getNamespaceURI(prefix));       
                      
        // invoke the method that is being tested
        process.endPrefixMapping(prefix);
        
        // ensure that the NamespacePrefixTracker has been updated
        assertNull("NamespacePrefixTracker was not updated with the " +
                   "endPrefixMapping event",                    
                     tracker.getNamespaceURI(prefix));
        
        // ensure the event was forwarded to the next process
        next.assertEndPrefixMappingInvoked(prefix);
    }

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                                                       "testLocalName");
        Attributes atts = new AttributesImpl();        
        
        XMLPipeline pipeline = dynamicProcess.getPipeline();        
        
        NamespacePrefixTracker tracker = 
                pipeline.getPipelineContext().getNamespacePrefixTracker();
        
        // register the prefix with the tracker
        tracker.startPrefixMapping("p", "testNamespace");
            
        // invoke startElement on the rule
        Object returned = rule.startElement(dynamicProcess, eName, atts);     
        
        // ensure the process was added to the pipeline

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    public JXPathFunctionsTestCase(String name) {
        super(name);
    }


    public void testGetUsedNamespaces() throws Exception {
        NamespacePrefixTracker namespacePrefixTracker =
            new DefaultNamespacePrefixTracker();
        JXPathFunctions functions =
            new JXPathFunctions(namespacePrefixTracker);
        ImmutableExpandedName nameA =
            new ImmutableExpandedName("http://spaceA",

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                     expectedURLs,
                     namespaceURLs);
    }


    public void testGetFunction() throws Exception {
        NamespacePrefixTracker namespacePrefixTracker =
            new DefaultNamespacePrefixTracker();
        JXPathFunctions functions =
            new JXPathFunctions(namespacePrefixTracker);
        ImmutableExpandedName nameA =
            new ImmutableExpandedName("http://spaceA",
                                      "a");
        ImmutableExpandedName nameB = new ImmutableExpandedName("", "b");
        ImmutableExpandedName nameC =
            new ImmutableExpandedName("http://spaceC",
                                      "c");
        Function a = new TestFunction();
        Function b = new TestFunction();


        functions.addFunction(nameA, a);
        functions.addFunction(nameB, b);


        // Add the non-default prefixes
        namespacePrefixTracker.startPrefixMapping("spaceA",
                                                  nameA.getNamespaceURI());
        namespacePrefixTracker.startPrefixMapping("spaceC",
                                                  nameC.getNamespaceURI());
        
        assertSame("function A",
                   a,
                   functions.getFunction("spaceA",

View Full Code Here

     */
    public void testUnprefixedFunction() throws Exception {
        // create a function
        Function function = new TestFunction();
        // create a JXPathFunctions instance
        NamespacePrefixTracker namespacePrefixTracker =
            new DefaultNamespacePrefixTracker();
        JXPathFunctions functions =
            new JXPathFunctions(namespacePrefixTracker);


        ImmutableExpandedName eName = new ImmutableExpandedName("", "foo");

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                   function,
                   functions.getFunction(null, "foo", null));
    }


    public void testAddFunction() throws Exception {
        NamespacePrefixTracker namespacePrefixTracker =
            new DefaultNamespacePrefixTracker();
        JXPathFunctions functions =
            new JXPathFunctions(namespacePrefixTracker);
        ImmutableExpandedName nameA =
            new ImmutableExpandedName("http://spaceA",

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            Function function = (Function) entry.getValue();
            context.registerFunction(name, function);
        }


        // Register the default prefixes.
        NamespacePrefixTracker tracker = context.getNamespacePrefixTracker();
        for (Iterator i = mappings.entrySet().iterator(); i.hasNext();) {
            Map.Entry entry = (Map.Entry) i.next();
            String prefix = (String) entry.getKey();
            String namespaceURI = (String) entry.getValue();
            tracker.startPrefixMapping(prefix, namespaceURI);
        }
    }

View Full Code Here

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Examples of com.volantis.xml.namespace.NamespacePrefixTracker

Caveat

Related Classes of com.volantis.xml.namespace.NamespacePrefixTracker