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https://issues.apache.org/jira/browse/WICKET-197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12462689
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Eelco Hillenius commented on WICKET-197:
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Biggest problem with this proposal is whether it won't open up pandora's box
and people will take this for the default way of doing things rather than it
being an optimization.
> 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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