Examples of org.apache.commons.chain.Catalog

org.apache.commons.chain.Catalog

A {@link Catalog} is a collection of named {@link Command}s (or {@link Chain}s) that can be used retrieve the set of commands that should be performed based on a symbolic identifier. Use of catalogs is optional, but convenient when there are multiple possible chains that can be selected and executed based on environmental conditions.
@author Craig R. McClanahan @version $Revision: 1.7 $ $Date: 2004/11/30 05:52:22 $

    /**
     * <p>Test adding a specifically named {@link Catalog} instance.</p>
     */
    public void testSpecificCatalog() {


        Catalog catalog = new CatalogBase();
        factory.setCatalog(catalog);
        catalog = new CatalogBase();
        factory.addCatalog("foo", catalog);
        assertTrue(catalog == factory.getCatalog("foo"));
        assertEquals(1, getCatalogCount());

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            return;
        }


        // Register the top element appropriately
        if (next instanceof Catalog) {
            Catalog catalog = (Catalog) next;
            String nameValue = attributes.getValue(nameAttribute);
            if (nameValue != null) {
                ((Catalog) next).addCommand(nameValue, command);
            }
        } else if (next instanceof Chain) {

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        if (servletPath == null) {
            servletPath = request.getServletPath();
        }


        // Map to the Command specified by the extra path info
        Catalog catalog = (Catalog) context.get(getCatalogKey());
        Command command = catalog.getCommand(servletPath);
        return (command.execute(context));


    }

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        if (pathInfo == null) {
            pathInfo = request.getPathInfo();
        }


        // Map to the Command specified by the extra path info
        Catalog catalog = (Catalog) context.get(getCatalogKey());
        Command command = catalog.getCommand(pathInfo);
        return (command.execute(context));


    }

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                        HttpServletResponse response)
        throws IOException, ServletException {


        ServletWebContext context =
            new ServletWebContext(getServletContext(), request, response);
        Catalog theCatalog = null;
        if (attribute != null) {
            theCatalog = (Catalog) getServletContext().getAttribute
                (this.attribute);
        } else if (catalog != null) {
            theCatalog = factory.getCatalog(catalog);
        } else {
            theCatalog = factory.getCatalog();
        }
        if (attribute == null) {
            request.setAttribute(CATALOG_DEFAULT, theCatalog);
        }
        Command command = theCatalog.getCommand(this.command);
        try {
            command.execute(context);
        } catch (Exception e) {
            throw new ServletException(e);
        }

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     */
    public void begin(String namespace, String name, Attributes attributes)
        throws Exception {


        // Retrieve any current Catalog with the specified name
        Catalog catalog = null;
        CatalogFactory factory = CatalogFactory.getInstance();
        String nameValue = attributes.getValue(nameAttribute);
        if (nameValue == null) {
            catalog = factory.getCatalog();
        } else {

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            context.getInitParameter(CONFIG_CLASS_RESOURCE);
        String ruleSet = context.getInitParameter(RULE_SET);
        String webResources = context.getInitParameter(CONFIG_WEB_RESOURCE);


        // Retrieve or create the Catalog instance we may be updating
        Catalog catalog = null;
        if (attr != null) {
            catalog = (Catalog) context.getAttribute(attr);
            if (catalog == null) {
                catalog = new CatalogBase();
            }

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            context.getInitParameter(CONFIG_CLASS_RESOURCE);
        String ruleSet = context.getInitParameter(RULE_SET);
        String webResources = context.getInitParameter(CONFIG_WEB_RESOURCE);


        // Retrieve or create the Catalog instance we may be updating
        Catalog catalog = null;
        if (attr != null) {
            catalog = (Catalog) context.getAttribute(attr);
            if (catalog == null) {
                catalog = new CatalogBase();
            }

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        ServletWebContext swcontext = (ServletWebContext) context;
        HttpServletRequest request = swcontext.getRequest();
        String value = request.getParameter(getParameter());


        // Map to the Command specified by the extra path info
        Catalog catalog = (Catalog) context.get(getCatalogKey());
        Command command = catalog.getCommand(value);
        return (command.execute(context));


    }

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     */
    private Command getCommand(Context context) {


        CatalogFactory catalogFactory = CatalogFactory.getInstance();
        String catalogName = getCatalogName();
        Catalog catalog = null;
        if (catalogName == null) {
            // use default catalog
            catalog = catalogFactory.getCatalog();
        } else {
            catalog = catalogFactory.getCatalog(catalogName);
        }
        if (catalog == null) {
            if (catalogName == null) {
                throw new IllegalArgumentException
                    ("Cannot find default catalog");
            } else {
                throw new IllegalArgumentException
                    ("Cannot find catalog '" + catalogName + "'");
            }
        }


        Command command = null;
        String name = getName();
        if (name == null) {
            name = (String) context.get(getNameKey());
        }
        if (name != null) {
            command = catalog.getCommand(name);
            if ((command == null) && !isOptional()) {
                if (catalogName == null) {
                    throw new IllegalArgumentException
                        ("Cannot find command '" + name
                         + "' in default catalog");

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