| Subject: null context in PossibleValuesService |
Author: Amaury TETREL |
Date: Tue, 22 December 2015 16:06 |
Hello,
I created a custom annotation, "ReferentielPossibleValues"
@XmlBinding(path = "@code")
@Label(standard = "Code")
@Required
// @Service(impl = ReferentielPossibleValueService.class, params =
// @Service.Param(name = "reference", value = "application"))
@ReferentielPossibleValues(ref = "application")
ValueProperty PROP_CODE = new ValueProperty(TYPE, "Code");
String getCode();
void setCode(String value);
On Sapphire extenxion I put the folowing code :
<service>
<implementation>fr.cats.mos.editor.service.ReferentielPossibleValueService
</implementation>
<condition>fr.cats.mos.editor.service.ReferentielPossibleValueService$Condition
</condition>
<id>referentiel-possible-values</id>
<context>Sapphire.Property.MetaModel</context>
</service>
I would like to update the possible values for this "Code" element using a IResourceChangeListener.
My custom class ReferentielPossibleValueService extends PossibleValuesService and IResourceChangeListener.
However, eachj time I'm trying to use this listener to update the available values, I'm getting a NullPointerException on the context() element. I think I forgot to initialize something but I don't really know what.
Here is the entire class code :
public class ReferentielPossibleValueService extends PossibleValuesService
implements IResourceChangeListener {
private static DocumentBuilder DOCUMENT_BUILDER;
private Set<String> getPossibleValues(String reference)
throws SAXException, IOException {
// getting values from XML file
return values
}
@Override
public void resourceChanged(IResourceChangeEvent iResourceChangeEvent) {
if (iResourceChangeEvent.getType() == IResourceChangeEvent.POST_CHANGE) {
try {
initPossibleValuesService();
Set<String> values = getPossibleValues("application");
System.out.println(values.toString());
compute(values);
} catch (SAXException | IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
protected void initPossibleValuesService() {
super.initPossibleValuesService();
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
.newInstance();
try {
DOCUMENT_BUILDER = documentBuilderFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
Sapphire.service(LoggingService.class).log(e);
throw new IllegalStateException(e);
}
}
public static final class Condition extends ServiceCondition {
@Override
public boolean applicable(final ServiceContext context) {
final Property property = context.find(Property.class);
if (property instanceof Value || property instanceof ElementList) {
final ReferentielPossibleValues possibleValuesAnnotation = property
.definition().getAnnotation(
ReferentielPossibleValues.class);
return (possibleValuesAnnotation != null && possibleValuesAnnotation
.ref().length() > 0);
}
return false;
}
}
@Override
protected void compute(Set<String> values) {
final ReferentielPossibleValues a = context(PropertyDef.class)
.getAnnotation(ReferentielPossibleValues.class);
values.clear();
try {
values.addAll(this.getPossibleValues(a.ref()));
} catch (SAXException | IOException e) {
Sapphire.service(LoggingService.class).log(e);
throw new IllegalStateException(e);
}
}
}
I hope someone here will be able to answer my question.
Thank you, and merry christmas ! =)
Amaury
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