static boolean isDesiredPrefixExpression(@Nullable PsiPrefixExpression prefixExpr, boolean increment) {
      return prefixExpr != null && (increment ? prefixExpr.getOperationTokenType().equals(JavaTokenType.PLUS) :
             prefixExpr.getOperationTokenType().equals(JavaTokenType.MINUS));
    }
static boolean isDesiredPrefixExpression(@Nullable PsiPrefixExpression prefixExpr, boolean increment)