boolean (PsiLiteralExpression expression) { PsiElement literal = expression.getFirstChild(); assert literal instanceof PsiJavaToken : literal; IElementType type = ((PsiJavaToken)literal).getTokenType(); return (type == JavaTokenType.CHARACTER_LITERAL || type == JavaTokenType.STRING_LITERAL || type == JavaTokenType.TEXT_BLOCK_LITERAL) && expression.getValue() == null; }