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https://issues.apache.org/jira/browse/WICKET-197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12462680
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Eelco Hillenius commented on WICKET-197:
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Such components will be marked stateless, and thus the only state they can
depend on is the in/out state that is explicitly done by that component.
> Let components contribute state to URLs
> ---------------------------------------
>
> Key: WICKET-197
> URL: https://issues.apache.org/jira/browse/WICKET-197
> Project: Wicket
> Issue Type: New Feature
> Components: wicket
> Reporter: Eelco Hillenius
> Fix For: 2.0
>
>
> The main purpose of this feature request is to let components expose state so
> that it gets carried with client. Such component can implement an interface
> like:
> public interface UrlContributor {
> Map<String,String> getState();
> void setState(Map<String, String> m);
> }
> Wicket would handle the scoping e.g. by prefixing the key/ value pairs with
> something that ids the components.
> The use case is that you get bookmarkable pages that can be statefull *on a
> component level* (rather than page level with PageParameters). For example:
> class PageableFoo extends SomeComponent implements UrlContributor {
> private int currentPage = 0;
> ...
> public ValueMap<String,String> getState() {
> return new ValueMap("page=" + currentPage);
> }
> void setState(ValueMap<String, String> m) {
> currentPage = m.getInt("page", 0);
> }
> }
> Then, "somepath:page=n" would be carried in every URL that points back to the
> page. This combined with the stateless pages/ components functionality and
> issue WICKET-30 gives users of Wicket almost limitless ability of tweaking
> their applications for bookmarkability and server side memory usage.
> To summarize: the goal of this proposal is to bring bookmarkability of state
> like we have with bookmarkable pages with page parameters to the component
> level.
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