Odtnhj

I'm trying to find a way to model an operation with a vararg input parameter.

The model should generate an interface as shown below.

/**
 * ...
 * @generated
 */
public interface Content extends EObject 
 /**
 * ...
 * @generated
 */
 List<Definition> getDefinitionsByLabels(String... label); 

Please don't answer with workarounds because I'm trying to update a model of an existing (large) code base (that was "manually" developed further post generation).

So far investigating this didn't look promising, but I didn't want to give up on this aspect without asking a question here.

Since varargs is not supported directly by the code generator of EMF, someone asked to make the upper limit a marker for varargs.
The bug report is pending, i.e. the requested feature is not available:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=337052

If what you want is a var-arg Java method on your model class, and you don't need a proper EMF operation, then this is possible to solve:

Make your model class implement a Java interface, where the vararg method is declared.

Java file:

public interface InterfaceWithVarargMethod 
 public void varArgMethod(String... arg);

Xcore file:

@GenModel(modelDirectory="/EMF_Trying/src-gen")
package emf_trying

interface InterfaceWithVarargMethod wraps InterfaceWithVarargMethod 

class ModelObject extends InterfaceWithVarargMethod 

An implementation of ModelObjectImpl without the var-arg method will get generated. You have to edit the generated code and add the var-arg method for the code to compile:

public class ModelObjectImpl extends MinimalEObjectImpl.Container implements ModelObject 
 /**
 * @generated NOT
 */
 @Override
 public void m(String... arg) 
 // Implementation of var-arg method
 

 ...

Maybe it is possible to find some variation of this solution where you don't have to edit the generated code. For example by making your model objects extend a Java class instead of an interface.