@Nullable
    private static PrepopulatedCollectionModel fromInitializer(PsiAnonymousClass anonymousClass, String type, CallMatcher addMethod) {
      PsiClassInitializer initializer = ClassUtils.getDoubleBraceInitializer(anonymousClass);
      if(initializer != null) {
        List<PsiExpression> contents = new ArrayList<>();
        for(PsiStatement statement : initializer.getBody().getStatements()) {
          if(!(statement instanceof PsiExpressionStatement)) return null;
          PsiMethodCallExpression call = tryCast(((PsiExpressionStatement)statement).getExpression(), PsiMethodCallExpression.class);
          if(!addMethod.test(call)) return null;
          PsiExpression qualifier = call.getMethodExpression().getQualifierExpression();
          if(qualifier != null && !qualifier.getText().equals("this")) return null;
          contents.addAll(Arrays.asList(call.getArgumentList().getExpressions()));
        }
        return new PrepopulatedCollectionModel(contents, Collections.emptyList(), type);
      }
      return null;
    }
@Nullable
    private static PrepopulatedCollectionModel fromInitializer(PsiAnonymousClass anonymousClass, String type, CallMatcher addMethod)