[news.eclipse.tools.emf] Re: Attribute dependency validation

[Ed Merks <merks@xxxxxxxxxx>]

José,

I'm fond of the expression  "Where there's a will there's a way".   So 
few things are truly impossible given a genuine desire to achieve the 
goal.  

Thanks for sharing the result of your effort.


José Parera wrote:
> OK. It's not an easy trick but it works.
>
> In my editor I use the EDataTypeValueHandler to validate inputs. So 
> I've created a MyEDataTypeValueHandler class.
>
> In this class I override the isValid(Object) method copying the 
> overrided code and merging it with some code from the 
> validate(EDataType, Object) method of the Diagnostician class. With 
> some tweaking I could finally put the EObject in the context map and 
> get it in the validateA method.
>
> This is the code. Maybe it could be useful for somebody.
>
> public class MyEDataTypeValueHandler extends EDataTypeValueHandler {
>
>  private EObject eObject;
>  
>  public MyEDataTypeValueHandler(EDataType eDataType, EObject eObject) {
>    super(eDataType);
>    this.eObject = eObject;
>  }
>  
>  public String isValid(Object valueObject) {
>    Object value;
>    if (eDataType.isInstance(valueObject)
>      && !(eDataType.getInstanceClass() == Object.class      && 
> valueObject instanceof String)) {
>     value = valueObject;
>    } else {
>      String string = (String) valueObject;
>      try {
>     value = eDataType.getEPackage().getEFactoryInstance()
>         .createFromString(eDataType, string);
>      } catch (Exception exception) {
>     String message = exception.getClass().getName();
>     int index = message.lastIndexOf('.');
>     if (index >= 0) {
>       message = message.substring(index + 1);
>     }
>     if (exception.getLocalizedMessage() != null) {
>       message = message + ": " + exception.getLocalizedMessage();
>        }
>     return message;
>      }
>   }
>   Map context = new HashMap();
>   context.put(EValidator.SubstitutionLabelProvider.class,
>               Diagnostician.INSTANCE);
>   context.put(EValidator.class, Diagnostician.INSTANCE);
>   context.put(EObject.class, eObject);
>   BasicDiagnostic diagnostics = new BasicDiagnostic(
>     EObjectValidator.DIAGNOSTIC_SOURCE, 0,
>     EcorePlugin.INSTANCE.getString("_UI_DiagnosticRoot_diagnostic",
>       new Object[] { Diagnostician.INSTANCE.
>                         getValueLabel(eDataType, value) }),
>             new Object[] { value, eDataType });
>   Diagnostician.INSTANCE.validate(eDataType, value, diagnostics, 
> context);
>   if (diagnostics.getSeverity() == Diagnostic.OK) {
>     return null;
>   } else {
>     return ((Diagnostic) diagnostics.getChildren().get(0))
>        .getMessage().replaceAll("'", "''").replaceAll("\\{","'{'"); // }}
>   }
> }
>
> Thanks