Bag (@NotNull PsiElement usage) { PsiElement context = getContainingStatement(usage); if (context != null) { final Bag usageFeatures = new JavaSimilarityFeaturesExtractor(usage, context).getFeatures(); if (Registry.is("similarity.find.usages.parent.statement.condition.feature")) { usageFeatures.addAll(getParentStatementFeatures(usage, context)); } return usageFeatures; } return Bag.EMPTY_BAG; }