Details
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Bug
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Status: Resolved
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Minor
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Resolution: Fixed
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None
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None
Description
When FSUtil.getFeature(fs, feature, type) is called on a feature that is multi-valued and type is Object, then the method fails with a message like
Unable to coerce value of feature [de.tudarmstadt.ukp.inception.api.kb.type.Fact:object] with type [de.tudarmstadt.ukp.inception.api.kb.type.FactObjectLink[]] into [java.lang.Object]
This is because Object is no an array or collection type. However, FSUtil.getFeatures should handle this as a special case. When the Object is used, basically any return value is acceptable. FSUtil should have defined behavior here, e.g. returning either an array or a list representation of the multi-value.
This is what current work-around code looks like:
private Object getValue(FeatureStructure fs, AnnotationFeature aFeature)
{
Object value;
Feature f = fs.getType().getFeatureByBaseName(aFeature.getName());
if (f.getRange().isPrimitive()) {
value = FSUtil.getFeature(fs, aFeature.getName(), Object.class);
}
else if (FSUtil.isMultiValuedFeature(fs, f)) {
value = FSUtil.getFeature(fs, aFeature.getName(), List.class);
}
else {
value = FSUtil.getFeature(fs, aFeature.getName(), FeatureStructure.class);
}
return value;
}