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 $

   /**
    * @return default catalog
    */
   public Catalog getCatalog()
   {
      Catalog catalog = catalogFactory.getCatalog();
      return catalog;
   }

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    * @param name
    * @return named catalog
    */
   public Catalog getCatalog(String name)
   {
      Catalog catalog = catalogFactory.getCatalog(name);
      return catalog;


   }

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   /**
    * @return default catalog
    */
   public Catalog getCatalog()
   {
      Catalog catalog = catalogFactory.getCatalog();
      return catalog;
   }

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    * @param name
    * @return named catalog
    */
   public Catalog getCatalog(String name)
   {
      Catalog catalog = catalogFactory.getCatalog(name);
      return catalog;


   }

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   /**
    * @return default catalog
    */
   public Catalog getCatalog()
   {
      Catalog catalog = catalogFactory.getCatalog();
      return catalog;
   }

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    * @param name
    * @return named catalog
    */
   public Catalog getCatalog(String name)
   {
      Catalog catalog = catalogFactory.getCatalog(name);
      return catalog;


   }

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     * @throws IllegalArgumentException If catalog cannot be found
     * @throws IllegalStateException    If command property is not specified
     */
    protected Command lookupExceptionCommand() {
        String catalogName = getCatalogName();
        Catalog catalog;


        if (catalogName == null) {
            catalog = CatalogFactory.getInstance().getCatalog();


            if (catalog == null) {
                LOG.error("Cannot find default catalog");
                throw new IllegalArgumentException(
                    "Cannot find default catalog");
            }
        } else {
            catalog = CatalogFactory.getInstance().getCatalog(catalogName);


            if (catalog == null) {
                LOG.error("Cannot find catalog '" + catalogName + "'");
                throw new IllegalArgumentException("Cannot find catalog '"
                    + catalogName + "'");
            }
        }


        String exceptionCommand = getExceptionCommand();


        if (exceptionCommand == null) {
            LOG.error("No exceptionCommand property specified");
            throw new IllegalStateException(
                "No exceptionCommand property specfied");
        }


        return catalog.getCommand(exceptionCommand);
    }

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     * @return The Command to process for this Context
     */
    protected Command getCommand(Context context) {
        CatalogFactory catalogFactory = CatalogFactory.getInstance();
        String catalogName = getCatalogName();
        Catalog catalog;


        if (catalogName == null) {
            catalog = catalogFactory.getCatalog();
            catalogName = "{default}"; // for debugging purposes
        } else {
            catalog = catalogFactory.getCatalog(catalogName);
        }


        if (catalog == null) {
            throw new IllegalArgumentException("Cannot find catalog '"
                + catalogName + "'");
        }


        Command command;
        String name = getName();


        if (name == null) {
            name = (String) context.get(getNameKey());
        }


        if (name != null) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Lookup command " + name + " in catalog "
                    + catalogName);
            }


            command = catalog.getCommand(name);


            if (LOG.isDebugEnabled()) {
                LOG.debug("Found command " + command + ";" + " optional: "
                    + isOptional());
            }

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    protected Command getCommand(String commandName, String catalogName) {
        if (commandName == null) {
            return null;
        }


        Catalog catalog;


        if (catalogName != null) {
            catalog = CatalogFactory.getInstance().getCatalog(catalogName);


            if (catalog == null) {
                LOG.warn("When looking up " + commandName + ","
                    + " no catalog found under " + catalogName);


                return null;
            }
        } else {
            catalogName = "the default catalog";
            catalog = CatalogFactory.getInstance().getCatalog();


            if (catalog == null) {
                LOG.warn("When looking up " + commandName + ","
                    + " no default catalog found.");


                return null;
            }
        }


        if (LOG.isDebugEnabled()) {
            LOG.debug("looking up command " + commandName + " in "
                + catalogName);
        }


        return catalog.getCommand(commandName);
    }

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    /**
     * <p>Test the default {@link Catalog} instance.</p>
     */
    public void testDefaultCatalog() {


        Catalog catalog = new CatalogBase();
        factory.setCatalog(catalog);
        assertTrue(catalog == factory.getCatalog());
        assertEquals(0, getCatalogCount());


    }

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