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java package of an EPackage [message #502803]

Wed, 09 December 2009 18:09

gary s thompson

Messages: 92
Registered: July 2009

Member

Dear all
For reasons of my own I needed recently to get the java package of an ecore package at runtime and couldn't seem to find a way to do it easily. Have I missed something Wink

In the end I came up with this rather inelegant hack which doesn't seem the best way.

private static String getJavaPackageNameForECorePackage(EPackage rootEPackage) {
//TODO this is a hack there should be a better way
Package rootJavaImplPackage = rootEPackage.getClass().getPackage();
List<String> packagePathParts = Arrays.asList(rootJavaImplPackage.getName().split("\\."));
return EUtils.join(packagePathParts.subList(0, packagePathParts.size()-1),".");
}

as usual any help graefully recieved
regards
gary

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Re: java package of an EPackage [message #502817 is a reply to message #502803]

Wed, 09 December 2009 19:25

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

Gary,

There are no utilities for doing this. Here's a simpler idiom we us in
XMLSaveImpl:

Field field = ePackage.getClass().getField("eINSTANCE");
javaImplementationLocation = "java://" +
field.getDeclaringClass().getName();

gary s thompson wrote:
> Dear all
> For reasons of my own I needed recently to get the java package of an
> ecore package at runtime and couldn't seem to find a way to do it
> easily. Have I missed something ;) In the end I came up with this
> rather inelegant hack which doesn't seem the best way.
>
> private static String getJavaPackageNameForECorePackage(EPackage
> rootEPackage) {
> //TODO this is a hack there should be a better way
> Package rootJavaImplPackage =
> rootEPackage.getClass().getPackage();
> List<String> packagePathParts =
> Arrays.asList(rootJavaImplPackage.getName().split("\\."));
> return EUtils.join(packagePathParts.subList(0,
> packagePathParts.size()-1),".");
> }
>
> as usual any help graefully recieved
> regards
> gary

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: java package of an EPackage [message #502836 is a reply to message #502817]

Wed, 09 December 2009 20:52

Eclipse User

Originally posted by: richkulp.us.NO_SPAM.ibm.com

Hi Ed,

Just out of curiosity, if you have: ePackage.getClass()

why do you need to get the field? Can't you just use the
ePackage.getClass()? Or is it possible that ePackage is not the package
class itself but a subclass that doesn't have the eINSTANCE field in it,
but inherits it?

Ed Merks wrote:
> Gary,
>
> There are no utilities for doing this. Here's a simpler idiom we us in
> XMLSaveImpl:
>
--
Thanks,
Rich Kulp

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Re: java package of an EPackage [message #502840 is a reply to message #502836]

Wed, 09 December 2009 21:10

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

Rich,

Comments below.

Rich Kulp wrote:
> Hi Ed,
>
> Just out of curiosity, if you have: ePackage.getClass()
>
> why do you need to get the field? Can't you just use the
> ePackage.getClass()?
This will get org.example.xyz.impl.XyzPackageImpl, i.e., the internal
implementation of the package, when we want org.example.xyz.XyzPackage,
i.e., the public API for the package.
> Or is it possible that ePackage is not the package class itself but a
> subclass that doesn't have the eINSTANCE field in it, but inherits it?
Yes. :-P
>
> Ed Merks wrote:
>> Gary,
>>
>> There are no utilities for doing this. Here's a simpler idiom we us
>> in XMLSaveImpl:
>>

Ed Merks
Professional Support: https://www.macromodeling.com/

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