[jira] Updated: (TAPESTRY-2487) Provide support for subclassing core components

["Howard M. Lewis Ship (JIRA)" <de...@tapestry.apache.org>]

     [ https://issues.apache.org/jira/browse/TAPESTRY-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Howard M. Lewis Ship updated TAPESTRY-2487:
-------------------------------------------

    Priority: Minor  (was: Major)

Tapestry does provide a lot of this functionality via either Mixins or via standard composition.

When I create an entity-specific link component, I create a component with a template that contains a standard page link. If necessary, I make the page link inherit parameters from the container component.

The issue with making all those methods protected (instead of private/package private) is that just increases the surface area of code that needs to stay backwards compatible from release to release; that can ultimately hamstring our ability to add new features.  Eventually you'll start seeing "PageLink2" or "Palette3" components, as we have to version components.

> Provide support for subclassing core components 
> ------------------------------------------------
>
>                 Key: TAPESTRY-2487
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2487
>             Project: Tapestry
>          Issue Type: Improvement
>          Components: tapestry-core
>    Affects Versions: 5.0.13
>            Reporter: Thiago H. de Paula Figueiredo
>            Priority: Minor
>
> Almost all core Tapestry 5 components have all methods with package visibility, something that prevents subclassing them to build new functionality over already existing ones or to change some specify behaviour. 
> Other related problem is access to parameters in subclasses, as they need to be private and the core components don't provide getters.
> The only solution found by me and other people in the Tapestry mailing list is to copy the original component code and then apply the needed changes.
> There is a discussion about this at http://www.nabble.com/-T5--About-core-components-subclassing-and-methods-with-package-visibility-to18104118.html.

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