Is there an API method in Eclipse to retrieve the URL for the Javadoc of an element?
I noticed that org.eclipse.jdt.ui.JavaUI appears to have a static function that accomplishes just that. You feed it an element and it returns the URL if it exists.
The problem I have is that I'm wanting to use this in connection with a plugin I'm using in Eclipse. You generally can't access the JDT classes unless you go somewhat roundabout it and this is discouraged by the Eclipse developers. So my question is is there another (easy) way to get the Javadoc URL for an element that doesn't require me to go too far out of my way?
If you parse the source code, you can get the class hierarchy. Then can access by using the same URL: http://docs.oracle.com/javase/6/docs/api/ plus the class path. For example, http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html for ArrayList class.
Related
I have an Eclipse RAP 2.3 application with two entry points, say /first and /second.
In the GUI of the first entry point, there is a button with which I would like to open the second entry point in a new browser tab. The event handler of that button is currently
UrlLauncher launcher = RWT.getClient().getService( UrlLauncher.class );
launcher.openURL( "/second");
This already doesn't work when the application is deployed as myapp.war in a Tomcat web server (should then be /myapp/second).
My questions:
What's the best way to determine the URL to open within the event handler?
Do I have to fetch the HttpServletRequest, get the context path and so some string manipulation?
Is it actually safe to call RWT.getRequest() at this point?
Update
According to Rüdiger's comment I can acquire the context path in two different ways.
The first approach is
RWT.getRequest().getContextPath();
where RWT.getRequest() is documented with
This method is not recommended
Secondly, I could obtain it with
ApplicationContextImpl ac = (ApplicationContextImpl) RWT.getApplicationContext();
String contextPath = ac.getServletContext().getContextPath();
where the IDE displays the warning
Discouraged access: The type ApplicationContextImpl is not accessible due to restriction on required library ...\org.eclipse.rap.rwt_2.3.2.20150128-1013.jar
Despite the warning, it still works when deploying a WAR file with OSGi bundles to Tomcat.
So, in both cases there is some kind of warning, which makes the solutions look rather like workarounds.
Using RWT.getRequest() is not recommended because usually RWT would shield you from the lower-level servlet API and certain direct interactions with the request could even interfere with RWTs life cycle and yield funny responses.
While in your case it would be safe to access the ServletContext via RWT.getRequest(), I recommend to use
RWT.getUISession( display ).getHttpSession().getServletContext();
to access the servlet context.
The second approach accesses internal classes that aren't part of the public API and therefore shouldn't be use. The accessed classes may change or be (re)moved in the future without further notice and break your application.
I am currently working on a Eclipse Plugin, where I need to make an action, when a person opens a file with certain properties. However I'm not sure on how to set a listener, I have been looking into the IWorkspace and IResource API, but I can't find the simple API call saying "AddListenerToOnOpenFile".
The file is expected to be opened in the package explorer view.
Use the answer supplied by #MarttiKäärik to find out when editors are open. Then you can use the IEditorInput to see if it is an IResource you care about.
if (part instanceof IEditorPart) {
IEditorPart editor = (IEditorPart) part;
IResource resource = editor.getEditorInput().getAdapter(IResource.class);
// ...
}
Question already answered, so only to make it a bit more complete...
You don't necessarily have to implement a view or action (as described in the question linked to by Martti Käärik in a comment) to get a window for your listener. Call to PlatformUI.getWorkbench().get...() can be used as well. See the older, probably duplicate, question called just Eclipse Plugin.
BTW Eclipse Wiki FAQ page contains a good description of the ways how to obtain the current workbench window and possible "gotchas".
Moreover, you can even listen for newly opened windows if there is a need:
PlatformUI.getWorkbench().addWindowListener(listener);
I mainly program Android, and one of the things I (and the rest of android programmers I'm sure) use with tenacity is android.util.Log. Every class I create has a
private static final String TAG = "ClassName";
tag that I write up as soon as I create the class, before I work on anything else. So, since I always create the tag I figured it would just save me on time (albeit a small amount) to just have it as part of the template for an empty class. My problem is, I don't know how or where to create code templates. Can anyone inform me on how to manage and create them?
What you're referring to are called "code templates" in Eclipse.
Go to Eclipse Preferences, search for "templates", you'll find them under Java -> Code Style -> Code Templates.
I am trying to build a simple gwt project that fetches tweets and displays them.The server passes back the tweets of type twitter4j.Tweet to the client.
Both modules import twitter4j.Tweet.
But when I run I get the following error:
--- ERROR: Line 37: No source code is available for type twitter4j.Tweet; did you forget to inherit a required module?.
I seem to have problems in inheriting twitter4j. All the posts I have seen about inheriting a jar file are not clear about how to do so. I understand I must write an inheritance instruction into gwt.xml file, something like
---
but if I try
---
it does not work. Can anyone please explain?
In a post I found on the Web one person suggested not to inherit it but:
-- Don't put twitter4j to your gwt.xml. Just add it your project class path. and make all functionalities like status updating and all in your serviceImpl. Try
This confuses me even more. I have added the jar file to my project libraries. But it does not work
I suspect I am missing something quite elementary here, but I am totally stuck. Is there something like a GWT path?
Many thanks for any help
Keep in mind that everything in your client package is compiled to JavaScript and executed in the user's browser. Thus, you'll only be able to use twitter4j's classes on the server-side of your application; you'll have to create some sort of light-weight GWT-serializable "proxy object" to pass data back and forth between your client and server tiers.
Since you can't use twitter4j on the client side of your app, you will not need anything in your .gwt.xml file referencing it. Instead, you'll add twitter4j to your classpath and do all your updating on the server side (as mentioned toward the bottom of your question). You do mention that it "does not work," but there's not enough information in your question to try to figure out why.
I'm working on a GWT project and I find it very tedious to have to add a function to my servlet, then copy and paste the function signature into my Service interface, then copy and paste it into my ServiceAsync interface and change the return parameter to be a callback. Is there a tool or a setting where I can just add public methods to my class and they can get copied into the other interfaces? Even if its not automatic it would be nice to be able to select specific methods and have them copied automatically.
I'm using eclipse and ideally it would update my interface each time I save implementation since thats when it checks my code and complains that my changes break the interface.
If you add the method to your *Service interface, then Eclipse can auto-generate the method ("Add unimplemented methods...") in your *ServiceImpl servlet, which you can then just fill in. Also, if you've got the Google Eclipse plugin installed, it will underline the new method in your *Service interface and complain that it's not in the *ServiceAsync. It might have a CTRL + 1 option to generate it in that interface as well.
You don't really need a tool. Just factor out the many RPC methods by just one method that takes a Request/Response. all you need to do is create subclasses of Request/Response and you don't need to think about adding new methods in the 2 interfaces.
You can use Google Guice on the server side to map the incomming request to a class handling the call... or you could use a visitor approach to forward the incoming request to the code handling the request (without resorting on a big instanceof construct).
Instantiations WindowBuilder GWT Designer does exactly what you are looking for.
The RemoteService Wizard will create all three files at the same time as well as keep them in sync as you make changes.
http://www.instantiations.com/windowbuilder/gwtdesigner/index.html
FWIW - I am only a user/purchaser of this product. I am not employed or in any other way related to Instantiations.