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Converting from CompilationUnitEditor to a Java Model element [message #544874]

Mon, 05 July 2010 19:18

Ciera

Messages: 5
Registered: June 2010

Junior Member

I'm trying to listen for caret updates on Java source files. I need to retrieve something in the Java AST when this occurs.

Right now, I have the following:

public void selectionChanged(IWorkbenchPart part, ISelection selection) {
	if (selection instanceof ITextSelection && part instanceof AbstractDecoratedTextEditor) {
		AbstractDecoratedTextEditor editor = (AbstractDecoratedTextEditor)part;
		//do stuff and refresh my view
	}
}

That part is actually a CompilationUnitEditor, but I noticed CompilationUnitEditor is in an internal package rather than an external one. However, the only way I see to get to the Java Model is through that class by calling getViewPartInput().

I found two other posts on this topic, but no answers on either:

http://www.eclipse.org/forums/index.php?t=msg&th=58457&a mp;#msg_185047

http://www.eclipse.org/forums/index.php?t=msg&goto=24855 3&

What is the suggested mechanism for going from an IWorkbenchPart and ISelection to, say, an ASTNode of the first complete statement on that line?

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Re: Converting from CompilationUnitEditor to a Java Model element [message #545063 is a reply to message #544874]

Tue, 06 July 2010 14:37

Dani Megert

Messages: 3802
Registered: July 2009

Senior Member

Ciera wrote:
> I'm trying to listen for caret updates on Java source files. I need to
> retrieve something in the Java AST when this occurs.
In order to also get caret movement you should use a post selection
changed listener. To get the CU use this:
org.eclipse.jdt.ui.JavaUI.getEditorInputTypeRoot(IEditorInpu t)
to get the AST:
org.eclipse.jdt.ui.SharedASTProvider.getAST(ITypeRoot, WAIT_FLAG,
IProgressMonitor)

Dani
>
> Right now, I have the following:
>
> public void selectionChanged(IWorkbenchPart part, ISelection selection) {
> if (selection instanceof ITextSelection && part instanceof
> AbstractDecoratedTextEditor) {
> AbstractDecoratedTextEditor editor =
> (AbstractDecoratedTextEditor)part;
> //do stuff and refresh my view
> }
> }
>
>
> That part is actually a CompilationUnitEditor, but I noticed
> CompilationUnitEditor is in an internal package rather than an
> external one. However, the only way I see to get to the Java Model is
> through that class by calling getViewPartInput().
>
> I found two other posts on this topic, but no answers on either:
>
> http://www.eclipse.org/forums/index.php?t=msg&th=58457&a mp;#msg_185047
>
> http://www.eclipse.org/forums/index.php?t=msg&goto=24855 3&
>
> What is the suggested mechanism for going from an IWorkbenchPart and
> ISelection to, say, an ASTNode of the first complete statement on that
> line?

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Re: Converting from CompilationUnitEditor to a Java Model element [message #545179 is a reply to message #545063]

Wed, 07 July 2010 00:02

Ciera

Messages: 5
Registered: June 2010

Junior Member

Thanks Dani! That got it for me.

Yes, I was using addPostSelectionListener, but was having trouble finding my way through the API to a CompilationUnit. Finished snippet for anyone else having this problem:

public void selectionChanged(IWorkbenchPart part, ISelection selection) {
	if (selection instanceof ITextSelection && part instanceof IEditorPart) {
		IEditorPart editor = (IEditorPart)part;
		ITypeRoot root = JavaUI.getEditorInputTypeRoot(editor.getEditorInput());
				
		if (root != null && root.getElementType() == IJavaElement.COMPILATION_UNIT) {
			ICompilationUnit compUnit = (ICompilationUnit)root;
			//use the comp unit to refresh my view
		}
	}
}

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