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Is there any utility which can return the line number where an IJavaElement occurs inside its source [message #296603]

Tue, 27 December 2005 21:42

Eclipse User

Originally posted by: varavamu.yahoo.com

hi,
I am writing a plugin and would like to find the line number in the
underlying source where a given IJavaElement is present. How can I infer
this? - either using a utility class (if there's one) or from the
IJavaElement itself?

thanks in advance,
Vijay

Re: Is there any utility which can return the line number where an IJavaElement occurs inside its [message #296607 is a reply to message #296603]

Tue, 27 December 2005 23:04

Eclipse User

Originally posted by: varavamu.yahoo.com

I came up with this, but it has a dependency on a 3.2 API:
private int getLineNumberInSource(IMember member) throws
JavaModelException {
if (member == null || !member.exists()) {
return -1;
}
ICompilationUnit compilationUnit = member.getCompilationUnit();
if (compilationUnit == null) {
return -1;
}
String fullSource = compilationUnit.getBuffer().getContents();
if (fullSource == null) {
return -1;
}
ISourceRange nameRange = member.getNameRange();
if (nameRange == null) {
return -1;
}
String string2 = fullSource.substring(0, nameRange.getOffset());
return
string2.split(compilationUnit.findRecommendedLineSeparator() ).length;
}

if there's some other way, or if this code has bugs (null checks
needed, etc.), I would really appreciate the heads-up.

thanks,
Vijay

Vijay Aravamudhan wrote:

> hi,
> I am writing a plugin and would like to find the line number in the
> underlying source where a given IJavaElement is present. How can I
> infer this? - either using a utility class (if there's one) or from
> the IJavaElement itself?
>
> thanks in advance,
> Vijay

Re: Is there any utility which can return the line number where an IJavaElement occurs inside its [message #296609 is a reply to message #296607]

Tue, 27 December 2005 23:51

Eclipse User

Originally posted by: automatic.javalobby.org

Try the following ..

public static int getLineNumber(IMember member) throws JavaModelException, BadLocationException
{
	ICompilationUnit compUnit = member.getCompilationUnit();
	Document document = new Document(compUnit.getBuffer().getContents());
		
	return document.getLineOfOffset(member.getSourceRange().getOffset());
}

I think it may be expensive to create Document, but do a trial run. I dont know whether it works or not.

Thanks
~Venkat

Re: Is there any utility which can return the line number where an IJavaElement occurs inside its [message #296626 is a reply to message #296609]

Wed, 28 December 2005 08:39

Eclipse User

Originally posted by: varavamu.yahoo.com

hi Venkat,
Thanks for the tip - but I am not sure which Document class you are
referring to - the one in javax.text, or org.w3c.dom or something else?
Anyways - the solution that I found works for me - so I will probably
stick with that. but its nice to know...
thanks,
Vijay

Venkataramana M wrote:

>Try the following ..
>
>

>public static int getLineNumber(IMember member) throws JavaModelException, BadLocationException
>{
>	ICompilationUnit compUnit = member.getCompilationUnit();
>	Document document = new Document(compUnit.getBuffer().getContents());
>		
>	return document.getLineOfOffset(member.getSourceRange().getOffset());
>}
>

>
>I think it may be expensive to create Document, but do a trial run. I dont know whether it works or not.
>
>Thanks
>~Venkat
>
>

Re: Is there any utility which can return the line number where an [message #296627 is a reply to message #296626]

Wed, 28 December 2005 09:49

Eclipse User

Originally posted by: automatic.javalobby.org

I was referring to org.eclipse.jface.text.Document which I think is extensively used in the implementation of JDT.

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