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Posted to dev@click.apache.org by "Bob Schellink (JIRA)" <ji...@apache.org> on 2010/05/08 05:49:00 UTC
[jira] Updated: (CLK-609) Use generics where appropriable
[ https://issues.apache.org/jira/browse/CLK-609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bob Schellink updated CLK-609:
------------------------------
Assignee: Bob Schellink
Fix Version/s: 2.2.0
> Use generics where appropriable
> -------------------------------
>
> Key: CLK-609
> URL: https://issues.apache.org/jira/browse/CLK-609
> Project: Click
> Issue Type: Improvement
> Components: core, extras
> Reporter: Andrey Rybin
> Assignee: Bob Schellink
> Priority: Minor
> Fix For: 2.2.0
>
>
> Because Click requires Java 1.5, Click can use its generics support.
> For example:
> Context:
> public <T extends Page> T createPage (Class<T> pageClass) {
> return clickServlet.createPage(pageClass, request);
> }
> @SuppressWarnings("unchecked")
> public <T extends Page> T createPage (String path) {
> return (T) clickServlet.createPage(path, request);
> }
> ClickServlet:
> @SuppressWarnings("unchecked")
> protected <T extends Page> T createPage (Class<T> pageClass, HttpServletRequest request) {
> String path = getConfigService().getPagePath(pageClass);
> if (path == null) {
> throw new IllegalArgumentException("No path configured for Page class: " + pageClass.getName());
> }
> return (T) initPage(path, pageClass, request);
> }
> then you can do:
> MyPage1 x = getContext() .createPage(MyPage1.class);//no explicit cast
> getContext() .createPage(String.class);//compilation error, red code in IDE
> AdminPage p = getContext() .createPage("/admin/edit.htm");// implicitly cast - Runtime check, but looks nice
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