Examples of org.apache.aries.blueprint.NamespaceHandler

org.apache.aries.blueprint.NamespaceHandler
A processor for custom blueprint extensions Namespace handlers must be registered in the OSGi service registry with the osgi.service.blueprint.namespace service property denoting the namespace URIs this handler can process. The service property value can be either a single String or URI, or a Collection respectively array of String or URI. During parsing when the blueprint extender encounters an element from a non-blueprint namespace it will search for a namespace handler for the namespace that is compatible with blueprint bundle being processed. Then for a stand-alone component the parser will invoke the parse method to create the Metadata for the xml element while for an element that is part of an existing component the parser will invoke the decorated method to augment the enclosing ComponentMetadata instance. Various utilities to interact with the blueprint parser are available to a namespace handler via the ParserContext argument passed to parse and decorate. Recommended behaviour:
- New metadata objects should be created via calling ParserContext.createMetadata(..) and casting the returned object to the appropriate MutableComponentMetadata interface. This method ensures that the metadata object implements the interfaces necessary for other namespace handlers to be able to use the metadata object.
  Also, to prevent id clashes, component ids should be generated by calling ParserContext.generateId().
- A namespace handler should not return new metadata instances from the decorate method if the same result could also be achieved by operating on a MutableComponentMetadata instance.
- A namespace handler should not assume the existence of predefined entries in the component definition registry such as blueprintBundle or blueprintBundleContext. In the case of a dry parse (i.e. a parse of the blueprint xml files without a backing OSGi bundle), these values will not be available

     *           or if the resolved prefix results as the blueprint namespace.
     */
    private ComponentMetadata handleCustomScope(Node scope, Element bean, ComponentMetadata metadata){
        URI scopeNS = getNamespaceForAttributeValue(scope);
        if(scopeNS!=null && !BLUEPRINT_NAMESPACE.equals(scopeNS.toString())){
            NamespaceHandler nsHandler = getNamespaceHandler(scopeNS);
            ParserContextImpl context = new ParserContextImpl(this, registry, metadata, scope);
            metadata = nsHandler.decorate(scope, metadata, context);
        }else if(scopeNS!=null){
            throw new ComponentDefinitionException("Custom scopes cannot use the blueprint namespace "+scope);
        }
        return metadata;
    }

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        }
        return enclosingComponent;
    }
    
    private ComponentMetadata decorateCustomNode(Node node, ComponentMetadata enclosingComponent) {
        NamespaceHandler handler = getNamespaceHandler(node);
        ParserContextImpl context = new ParserContextImpl(this, registry, enclosingComponent, node);
        return handler.decorate(node, enclosingComponent, context);
    }

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        ParserContextImpl context = new ParserContextImpl(this, registry, enclosingComponent, node);
        return handler.decorate(node, enclosingComponent, context);
    }


    private Metadata parseCustomElement(Element element, ComponentMetadata enclosingComponent) {
        NamespaceHandler handler = getNamespaceHandler(element);
        ParserContextImpl context = new ParserContextImpl(this, registry, enclosingComponent, element);
        return handler.parse(element, context);
    }

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    private NamespaceHandler getNamespaceHandler(URI uri) {
        if (handlers == null) {
            throw new ComponentDefinitionException("Unsupported node (namespace handler registry is not set): " + uri);
        }
        NamespaceHandler handler = this.handlers.getNamespaceHandler(uri);
        if (handler == null) {
            throw new ComponentDefinitionException("Unsupported node namespace: " + uri);
        }
        return handler;
    }

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        tracker.open();
    }


    public Object addingService(ServiceReference reference) {
        LOGGER.debug("Adding NamespaceHandler "+reference.toString());
        NamespaceHandler handler = (NamespaceHandler) bundleContext.getService(reference);
        if(handler!=null){
            try {
                Map<String, Object> props = new HashMap<String, Object>();
                for (String name : reference.getPropertyKeys()) {
                    props.put(name, reference.getProperty(name));

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        addingService(reference);
    }


    public void removedService(ServiceReference reference, Object service) {
        try {
            NamespaceHandler handler = (NamespaceHandler) service;
            Map<String, Object> props = new HashMap<String, Object>();
            for (String name : reference.getPropertyKeys()) {
                props.put(name, reference.getProperty(name));
            }
            unregisterHandler(handler, props);

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            candidates.put(ns, h);
        }
        // Exclude directly incompatible handlers
        for (URI ns : namespaces) {
            for (Iterator<NamespaceHandler> it = candidates.get(ns).iterator(); it.hasNext();) {
                NamespaceHandler h = it.next();
                Set<Class> classes = h.getManagedClasses();
                boolean compat = true;
                if (classes != null) {
                    Set<Class> allClasses = new HashSet<Class>();
                    for (Class cl : classes) {
                        for (Class c = cl; c != null; c = c.getSuperclass()) {
                            allClasses.add(c);
                            for (Class i : c.getInterfaces()) {
                                allClasses.add(i);
                            }
                        }
                    }
                    for (Class cl : allClasses) {
                        Class clb;
                        try {
                            clb = bundle.loadClass(cl.getName());
                        } catch (Throwable t) {
                            clb = null;
                        }
                        if (clb != cl) {
                            compat = false;
                            break;
                        }
                    }
                }
                if (!compat) {
                    it.remove();
                }
            }
        }
        // TODO: do we need to check if there are incompatibilities between namespaces?
        // Pick the first ones
        for (URI ns : namespaces) {
            Set<NamespaceHandler> h = candidates.get(ns);
            if (!h.isEmpty()) {
                handlers.put(ns, h.iterator().next());
            }
        }
        return handlers;
    }

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     *           or if the resolved prefix results as the blueprint namespace.
     */
    private ComponentMetadata handleCustomScope(Node scope, Element bean, ComponentMetadata metadata){
        URI scopeNS = getNamespaceForAttributeValue(scope);
        if(scopeNS!=null && !BLUEPRINT_NAMESPACE.equals(scopeNS.toString())){
            NamespaceHandler nsHandler = getNamespaceHandler(scopeNS);
            ParserContextImpl context = new ParserContextImpl(this, registry, metadata, scope);
            metadata = nsHandler.decorate(scope, metadata, context);
        }else if(scopeNS!=null){
            throw new ComponentDefinitionException("Custom scopes cannot use the blueprint namespace "+scope);
        }
        return metadata;
    }

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        }
        return enclosingComponent;
    }
    
    private ComponentMetadata decorateCustomNode(Node node, ComponentMetadata enclosingComponent) {
        NamespaceHandler handler = getNamespaceHandler(node);
        ParserContextImpl context = new ParserContextImpl(this, registry, enclosingComponent, node);
        return handler.decorate(node, enclosingComponent, context);
    }

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        ParserContextImpl context = new ParserContextImpl(this, registry, enclosingComponent, node);
        return handler.decorate(node, enclosingComponent, context);
    }


    private Metadata parseCustomElement(Element element, ComponentMetadata enclosingComponent) {
        NamespaceHandler handler = getNamespaceHandler(element);
        ParserContextImpl context = new ParserContextImpl(this, registry, enclosingComponent, element);
        return handler.parse(element, context);
    }

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Related Classes of org.apache.aries.blueprint.NamespaceHandler

org.apache.aries.blueprint.container.Parser

org.apache.aries.blueprint.namespace.NamespaceHandlerRegistryImpl

org.apache.aries.blueprint.parser.Parser

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