@NotNull
public static Collection<? extends PsiElement> getPossibleInitializationElements(
final PsiElement qualifierExpression) {
if (qualifierExpression instanceof PsiMethodCallExpression) {
return Collections.singletonList(qualifierExpression);
}
if (qualifierExpression instanceof PsiReferenceExpression) {
final PsiElement targetElement = ((PsiReferenceExpression) qualifierExpression).resolve();
if (!(targetElement instanceof PsiVariable)) {
return Collections.emptyList();
}
final Collection<? extends PsiElement> variableValues =
getCachedVariableValues((PsiVariable) targetElement, qualifierExpression);
if (variableValues == null || variableValues.isEmpty()) {
return DfaPsiUtil.getVariableAssignmentsInFile(
(PsiVariable) targetElement, false, qualifierExpression);
}
return variableValues;
}
if (qualifierExpression instanceof PsiLiteralExpression) {
return Collections.singletonList(qualifierExpression);
}
return Collections.emptyList();
}
