/**
* @see
* com.intellij.psi.util.TypeConversionUtil#typeParameterErasure(com.intellij.psi.PsiTypeParameter)
*/
@Nullable
private static JavaType typeParameterErasure(
@NotNull JavaTypeParameter typeParameter,
@NotNull HashSet<JavaTypeParameter> visited,
@NotNull JavaTypeSubstitutor substitutor) {
Collection<JavaClassifierType> upperBounds = typeParameter.getUpperBounds();
if (!upperBounds.isEmpty()) {
JavaClassifier classifier = upperBounds.iterator().next().getClassifier();
if (classifier instanceof JavaTypeParameter && !visited.contains(classifier)) {
JavaTypeParameter typeParameterBound = (JavaTypeParameter) classifier;
visited.add(typeParameterBound);
JavaType substitutedType = substitutor.substitute(typeParameterBound);
if (substitutedType != null) {
return erasure(substitutedType);
}
return typeParameterErasure(typeParameterBound, visited, substitutor);
} else if (classifier instanceof JavaClass) {
return ((JavaClass) classifier).getDefaultType();
}
}
return typeParameter.getTypeProvider().createJavaLangObjectType();
}
